Global database on large magnitude explosive volcanic eruptions (LaMEVE)
- Helen Sian Crosweller1Email author,
- Baneet Arora2,
- Sarah Krystyna Brown1,
- Elizabeth Cottrell3,
- Natalia Irma Deligne1, 4,
- Natalie Ortiz Guerrero1, 5, 6,
- Laura Hobbs1, 7,
- Koji Kiyosugi8,
- Susan Clare Loughlin9,
- Jonathan Lowndes9,
- Martin Nayembil2,
- Lee Siebert3,
- Robert Stephen John Sparks1,
- Shinji Takarada10 and
- Edward Venzke3
© Crosweller et al.; licensee Springer. 2012
Received: 11 June 2012
Accepted: 16 August 2012
Published: 10 September 2012
To facilitate the assessment of hazards and risk from volcanoes, we have created a comprehensive global database of Quaternary Large Magnitude Explosive Volcanic Eruptions (LaMEVE). This forms part of the larger Volcanic Global Risk Identification and Analysis Project (VOGRIPA), and also forms part of the Global Volcano Model (GVM) initiative (http://www.globalvolcanomodel.org). A flexible search tool allows users to select data on a global, regional or local scale; the selected data can be downloaded into a spreadsheet. The database is publically available online at http://www.bgs.ac.uk/vogripa and currently contains information on nearly 3,000 volcanoes and over 1,800 Quaternary eruption records. Not all volcanoes currently have eruptions associated with them but have been included to allow for easy expansion of the database as more data are found. Data fields include: magnitude, Volcanic Explosivity Index (VEI), deposit volumes, eruption dates, and rock type. The scientific community is invited to contribute new data and also alert the database manager to potentially incorrect data. Whilst the database currently focuses only on large magnitude eruptions, it will be expanded to include data specifically relating to the principal volcanic hazards (e.g. pyroclastic flows, tephra fall, lahars, debris avalanches, ballistics), as well as vulnerability (e.g. population figures, building type) to facilitate risk assessments of future eruptions.
Explosive volcanism represents a key Earth process that transfers heat and mass from the Earth’s interior to the surface. Its products contribute constituents to global geochemical cycles, affecting the near surface geosphere, hydrosphere and atmosphere. Volcanic eruptions have the potential to cause loss of life, disrupt air traffic, impact the climate and significantly alter the surrounding landscape. Knowledge of magnitude-frequency relationships is poorly constrained at a majority of volcanoes but is key for assessing environmental and societal impacts of volcanism on global, regional and local scales. We have created a database of Large Magnitude Explosive Volcanic Eruptions (LaMEVE) to support these assessments and provide basic information on global explosive volcanism.
The LaMEVE database contains the nearly 3,000 Quaternary volcanoes catalogued by the Smithsonian’s Global Volcanism Program and over 1,800 explosive eruption records spanning the last 1.8 My. Not all volcanoes currently have eruptions associated with them but have been included to allow for easy expansion of the database as more data are found. The ultimate objective is to go back to the start of the Quaternary at its current definition of 2.58 Ma, but at present the database is limited to the previous definition of 1.8 Ma.
The database, accessible online at http://www.bgs.ac.uk/vogripa, primarily consists of data on eruption magnitude, age and source volcano location. The data were collected from published literature; principally Volcanoes of the World by Siebert et al. (2010) and journal articles, but also other online databases, books, public reports, conference proceedings, etc. This database should be of particular interest to volcanology researchers, hazard modellers and civil authorities responsible for crisis management.
The database also contains information on deposit type, deposit volumes, eruption intensity, rock type classification, data errors and uncertainties with indices of data reliability. The database is currently restricted to larger magnitude eruptions because they have large hazard footprints that can threaten large populations. They are difficult to predict and occur less frequently than smaller eruptions. Some of the largest historic eruptions occur at volcanoes presumed dormant; as such, preparation and response are often poor. These larger eruptions are typically responsible for the greatest loss of life in the historical period (Siebert et al., 2010, pp. 41).
There exist two other databases similar in scope to LaMEVE: that of the Smithsonian Institution’s Global Volcanism Program (GVP, http://www.volcano.si.edu; Siebert et al. 2010) and the database by Mason et al. (2004) with eruptions of M≥8. LaMEVE, however, is distinctly different from these two. The database maintained by the Smithsonian’s Global Volcanism Program is the leading source of global information on volcanic eruptions at all magnitude scales; however, it currently focuses on Holocene eruptions (the last 10,000 years). Analysis of large magnitude eruptions over this timescale has shown that this is an insufficient amount of time for adequate sampling of the largest eruptions (M>6.5) (Deligne et al., 2010). The database of Mason et al. (2004) concentrated on the very largest magnitude eruptions, which are considered to have the greatest potential for global repercussions. LaMEVE covers all eruptions of M≥4, as these eruptions still have the capacity to cause considerable regional and local disruption.
LaMEVE is the first component of the VOGRIPA (Volcanic Global Risk Identification and Analysis Project) database of volcanic hazards, which is being developed as part of the Global Volcano Model (GVM, http://www.globalvolcanomodel.org). The long-term aim of GVM is to have a global source of freely available information on volcanic hazards and volcanism produced to agreed standards and protocols.
This article discusses the structure and fields of the LaMEVE database, including its links with other databases, some of the difficulties encountered whilst constructing the database, how these issues were dealt with, perceived uses, and planned future developments. The paper also outlines planned steps to make the database accessible as well as further development ideas, including the ability for the scientific community to add new data.
The following section is split into sub-sections based on the tables within the database. The two main tables are ‘Volcano’ and ‘Eruption,’ with the other tables linking to these; therefore the following discussion will be separated into these two main headings. Volcano attributes include spatial location and volcano type, while eruption attributes include timeframe data and quantitative eruption size characteristics. This database was structured using the ‘normalisation’ method, which is a process of removing duplication in the data, therefore minimising redundancy and the chance of entering inconsistent data (Connolly and Begg, 2005; Powell 2006).
The Volcano table contains information on almost 3,000 volcanoes from around the world. The information is derived from the Smithsonian Institution’s GVP database and includes volcanoes that are known or suspected to have erupted within the Holocene or late Pleistocene. Also included are some volcanoes now in the fumarolic stage, which signifies either a long pause between eruptions or residual degassing of a volcano that has not erupted for many thousands of years (Siebert et al., 2010, p3).
Data fields include volcano name and Smithsonian volcano number (VNUM), which are sanctioned by the International Association of Volcanology and Chemistry of the Earth’s Interior (IAVCEI). If data are found on an eruption from a volcano not currently in the GVP database, the Smithsonian will be responsible for generating a new VNUM, which we would then use to add the data to our database. Additional fields include a unique table identifiera, latitude and longitude coordinates, region and sub-region codes and volcano type as assigned by the Smithsonian.
Volcano Alternative Name
Alternative names, also sourced from the Smithsonian’s database, are listed. These can be synonyms (i.e. different names for the same volcano), some of which are different spellings of the same name (e.g. Vulsini / Volsini) while others are significantly different from the official name (e.g. Santorini / Thera). They can also include names of features (e.g. cones or calderas). Although eruption records are linked via the main volcano name, the alternative names can be used to retrieve data from the appropriate volcano records.
The Eruption table lists the unique identifier ID field (required in every table) and the Unit Name, of which there may be more than one listed. This records how the eruptive deposit is referred to in the literature, and provides a way of ensuring that the data all relate to the same eruption. The other columns in the Eruption table are actually links to other data tables (called ‘foreign keys’), discussed below. Foreign keys are joined to the main eruption table via a one-to-many relationship allowing multiple pieces of data relating to one eruption to be reported, e.g. more than one date for the eruption from different sources. There is no judgement on what data are included in the database; the user can therefore use their own discretion regarding which data they wish to use for their own analyses.
This is a data-rich table which reports the following eruption characteristics, described separately below:
● Column height
● Tephra fall deposit volume and DRE (Dense Rock Equivalent) volume
● Ignimbriteb volume and DRE volume
● Primary intra-caldera material deposit volume and DRE volume
● Bulk deposit volume and DRE volume
Whilst this is a large amount of data to store in one table, these are all interrelated and require the same fields, namely a value and, where appropriate, either an error or qualifier (e.g. less than, greater than) or both. These quantitative characteristics are grouped into 3 categories to facilitate data handling: eruption size, deposit volume and DRE volume. The source of each data point is labelled as either ‘literature’, in which case it is linked to the reference source, ‘calculated’ or ‘assumed’ (see section 126.96.36.199 for more information).
The Volcanic Explosivity Index (VEI) devised by Newhall and Self (1982) describes the size of explosive eruptions; values range from 0 (gentle) to 8 (colossal). VEI is reported in the Smithsonian Institution’s GVP database and is the most widely reported eruption descriptor in volcanology. These data are used wherever available so as to avoid disparity between the databases. As there is no single piece of information that can fully describe the character of an explosive eruption, the VEI incorporates multiple criteria for assigning a value. The VEI is a semi-quantitative scale based on 8 criteria, but in most cases is based principally on the erupted tephra volume (ancient eruptions) or a combination of plume height and eruptive volume (observed eruptions). This enables the VEI to be assigned from both quantitative and qualitative data, even if some information is missing, allowing a great number of eruptions to be classified. However, the VEI implicitly assumes that eruption magnitude and intensity are related, which is not necessarily true (Carey and Sigurdsson, 1989; Pyle, 2000). The LaMEVE database records VEI, magnitude (M) and intensity (I), so the relationships between these parameters can be assessed; this topic is discussed in this paper’s companion.
This measure has the added advantage over the VEI of being a more precise measure of eruption size. Typical estimates of volumes justify calculating magnitudes to the first decimal place in the database, allowing more discrimination. It is a quantitative parameter rather than a qualitative indicator that can be used to estimate magnitude-frequency relationships. The largest explosive eruptions on Earth are ~M=9 and so comparable to the magnitude of the largest earthquakes.
The minimum and maximum magnitude values for each VEI classification in the LaMEVE database as well as the mean magnitude with associated variance
Number and percentage of records in the LaMEVE database where magnitude values are either less than, the same as, or greater than the VEI classification
Intensity and column height
It has been established that, for explosive eruptions, column height is related to intensity (Wilson et al., 1978; Sparks et al., 1997), reflecting the rate of thermal energy transfer into the atmosphere. Estimated column heights (in km) are determined either from direct observations for some historical eruptions, or by using the maximum clast size dispersal method of Carey and Sparks (1986). We note that this method has been recently updated by Burden et al. (2011), but has not yet been applied to the data in this database.
Deposit volume and DRE
Tephra density, unless otherwise reported, is assumed to be 1000 kg/m3. Magma density varies according to the magma type (see below). For some records estimates and measurements of tephra deposit density are given; in these cases the deposit-specific literature value is used.
Data quality indicator
Criteria for applying data quality indicators to eruption dates
DATING DATA QUALITY INDICATOR
Only qualitative data provided (e.g. Holocene).
Date reported in the literature without error and or dating method not specified OR stratigraphically dated OR reported errors >30% OR unit has multiple published dates that differ by >30%.
Single date (historical or geochronology) with a method and errors cited OR unit has multiple published dates that differ by 10-30% OR historical ages uncertain by more than one year.
Single precise historical date within a year OR multiple published dates that differ by <10%.
Criteria for applying data quality indicators to volume data
VOLUME DATA QUALITY INDICATOR
No isopach map or evidence to support cited volume OR assumed value.
Simple isopach map or thickness data (< 10 measurements) OR volume calculation with no methodology given OR volume derived from method other than isopach map (e.g. size of caldera; VEI estimate; duration and intensity of column heights).
Isopach map drawn from >10 and <30 measured thicknesses with calculation method described.
Isopach map drawn from >30 measured thicknesses with calculation method described.
We assign the lowest data quality level to those magnitudes and volumes that are ‘assumed.’ These are cases where quantitative data are inferred from qualitative descriptions. For example, an eruption might be described as ‘Plinian’ or ‘caldera forming’; such an eruption is clearly explosive and therefore eligible for inclusion in the database (e.g. ‘Tegalsruni’ eruption unit from Merapi). The Smithsonian classifies these events as VEI 4 or larger, but does not assign a specific VEI. A magnitude of ≥4 is thus assigned to these eruptions in the LaMEVE database with the derivation method listed as ‘assumed’. This permits the event to be included in a count of explosive eruptions despite an unknown actual eruption size. Eruption size and corresponding data quality can be updated as new information becomes available. When an assumed VEI/magnitude is entered the following corresponding assumed volumes are entered, as from Newhall and Self (1982):
● VEI 4: tephra volume ≥ 0.1 km3
● VEI 5: tephra volume ≥ 1 km3
● VEI 6: tephra volume ≥ 10 km3
● VEI 7: tephra volume ≥ 100 km3
● VEI 8: tephra volume ≥ 1,000 km3
Eruption Date and C14 Date
These two tables are linked as they both refer to eruption date. While the Eruption Date table contains both start and end date fields, only the former is populated. End dates will be added in the future but there are very little reliable data for non-historical events and further thought is required on how to populate this entry. For historical eruptions, the day, month and year of eruption are often reported; there are currently 238 such eruptions in the LaMEVE database. Older eruptions are less precisely dated and often only the year is known. For such eruptions the dating method and associated error margin are recorded when known. As well as standard calendar years for recent eruptions, all eruption dates are recorded in years before present (BP) with ‘present’ taken as 1950; negative numbers in this field therefore reflect years after 1950.
For prehistoric events a number of dating techniques can be employed. For eruptions that occurred in the last ~50,000 years radiocarbon (C14) dating is the most common dating method; just over 550 radiocarbon dates are currently listed in the database. However, radiocarbon years are not equivalent to standard calendar years (cal BP) because of fluctuations in atmospheric C14 and thus a calibration must be applied to determine the actual eruption date. This calibration is sometimes done by the author of the source reference and can be reported with or without the uncorrected C14 date. Where reported, the original C14 dates and errors are recorded in the Eruption C14 Date table. Where no calibrated date has been given, we have applied the calibration using a publically available tool. The method used is reported in the database, but generally the Calib program (v6.1.1) by Stuiver and Reimer (1993) is used for dates <26 Ky and the Fairbanks et al. program (2005) for events up to 50,000 cal BP. If no error has been reported for the C14 date, an error margin of 12% of the date is entered into the calibration program, as derived from statistical analysis of those dates with reported errors. For uncalibrated dates that fall outside the range of even the Fairbanks program, and where no literature-sourced date is available, an age of 50 Ka (the limit of the Fairbanks et al. program) is entered into the Year BP field (with the standard 12% error) but is labelled as ‘assumed;’ as Year BP is a required field, we need to enter an approximate date for the eruption. In all cases, calibrations are reported using the 1-sigma range (68.3% confidence intervals), as 2-sigma ranges are not available using the Fairbanks tool. Data from Bryson et al. (2006) of >2,000 calibrated radiocarbon dates from the late Pleistocene and Holocene have also been cited.
Other commonly used dating methods are Argon-Argon (40Ar-39Ar), Potassium-Argon (K-Ar), stratigraphy and tephrochronology. The first two are similar to radiocarbon dating insofar as they provide absolute dates, with some uncertainty, whereas the other two provide an approximate date relative to bracketing stratigraphic layers which usually have been precisely dated by another method.
Rock Type Classification and Eruption Magma
Each magma type has an ‘assumed magma density’ ranging from 2,300 kg/m3 for rhyolitic magmas to 2,700 kg/m3 for basaltic magmasc. When the magma type is unknown, a median value of 2,500 kg/m3 is entered. These density values are used in Equation 4 to calculate the DRE volume from deposit volumes. Whilst these are relatively arbitrary values the error introduced into DRE and M values is small compared to other sources of uncertainty. For example, for a tephra volume of 100 km3, using a density value of 2,300 kg/m3 gives a DRE of 43.49, whereas when the density is assumed to be 2,700 kg/m3 the DRE is 37.04. Using either of these values to calculate the magnitude would result in the same value, correct to 3 decimal places (7.000). Furthermore, assumed density values are overwritten if the literature includes a calculation of magma density, and these reported values are used instead in the DRE volume calculation.
An extensive table contains sources for all the LaMEVE data, and all data tables are linked to it so that the source for each piece of data can be traced. Included in the database are data from a number of pre-existing databases, such as the aforementioned Smithsonian Institution’s GVP database and, more recently, a significant contribution of Japanese data following the translation of two main databases; one by the Quaternary Volcanoes in Japan 2008(http://riodb02.ibase.aist.go.jp/strata/VOL_JP/EN/index.htm, last modified October 2011) and the other by Hayakawa 2010(http://gunma.zamurai.jp/database/, last modified September 2010). The primary references for data derived from the Smithsonian’s GVP will be available online from that database directly (Cottrell et al., in prep.). It also contains data gathered from a variety of published material, mostly peer-reviewed journal articles.
Commonly more than one paper is written about a particular eruption or deposit, which can result in different estimates for the same kind of data, for example an eruption date or volume. In the interests of being inclusive, all published data are included. However, a ‘preferred’ default value has been selected using the data quality indicators described in Tables 3 and 4, whereby the data point with the highest quality level defaults as the preferred value. If there is more than one entry with the same data quality level, the most recent publication is the default.
Searching the Database
The database is available online through a website hosted by the British Geological Survey (BGS). In addition to information regarding the project’s background and its future objectives, the website allows users access to the entire database via a customisable search facility. This search tool is flexible and multiple criteria can be entered. A GIS-enabled graphical tool allows users to select an initial Area of Interest (AoI), if desired. An attributes search can be performed either separately, or in addition to the area search, by entering criteria for a number of fields, currently:
● Volcano name
● Volcano type (select from list)
● Eruption start date (exact/partial date or range)
● Region (select from list)
● Eruption size (range)
● Composition (select from list)
● Bulk volume (range)
● DRE volume (range)
● Column height (range)
● Tephra fall volume (range)
By default results are ordered alphabetically by volcano name but there is also the option to sort by volcano type or region. The summary dataset can be downloaded as a spreadsheet or the search can be refined further via two methods. By selecting ‘Refine Search’ from a menu on the left, the original search screen is redisplayed and changes can be made. Alternatively, the ‘Filter’ tool can be used to select the volcano types and or regions of interest.
When an individual volcano is selected from the initial results page, a volcano summary, which includes a location map, is displayed at the top of the page (this is in addition to the full search results listed). The volcano-specific summary includes the following information:
● Volcano name
● Alternate name
● Region/Sub region
● VNUM (hyperlinked to the Smithsonian’s website)
● Volcano type
Uses of the database
LaMEVE constitutes an extensive volcanic data repository available for researchers who would have previously had to do substantial literature searches to find information on past activity. It is anticipated that civil authorities responsible for crisis management will be interested in the data to inform future management of regional volcanoes.
Whilst the database currently holds a large number of records, it is inevitably incomplete and likely contains errors. The key to improving the database will be user input and future updates as new data are published, relevant existing data are identified and existing records are updated, corrected or modified. A notable advantage to having the database online is that it will allow users to easily access the data, identify and fill gaps and correct mistakes. Any changes or updates suggested by external users will be assessed by the database manager before being entered into the database.
The database will also be used as a research tool to analyse global, regional and local patterns of volcanic activity to identify locations at high risk and gaps in knowledge about hazard and risk, as per the goals of VOGRIPA and GVM. Furthermore, the recurrence rates of different magnitude eruptions and particular hazardous phenomena, as well as the stationarity of global volcanism can be evaluated. Under-recording of events, especially those of smaller magnitude, is a significant problem (Deligne et al., 2010; Furlan, 2010) and this can be investigated with the data. A preliminary analysis of the LaMEVE database looking at patterns in the data along with an assessment of under-recording, both temporally and spatially, will be presented in a forthcoming paper.
LaMEVE provides standardised, internally consistent data on global explosive volcanism. The database has considerable flexibility for the user who can, for example, make decisions on what data to use in analysis, e.g. decide which is the best date to use, how to combine multiple dates or whether to discard dates. We note that it is the responsibility of the user to explain and justify data usage.
LaMEVE can be queried for data that can feed into hazard and risk assessments allowing users to analyse hazard and risk within local, regional and global contexts; this should be particularly beneficial in under-studied areas. An example of an application of volcanic hazard and risk assessment is a study of 22 high priority GFDRR (Global Facility for Disaster Reduction and Recovery, World Bank) countries (Aspinall et al., 2011). Here the LaMEVE database has been used to calculate regional recurrence rates of explosive eruptions as a function of magnitude, which will be discussed in a later paper.
Planned future development
The LaMEVE database is the first output of VOGRIPA. A number of databases will be developed to link with the existing structure to provide data specifically relating to the main volcanic hazards (e.g. pyroclastic flows, tephra fall, lahars, debris avalanches, ballistics). These databases will be cross-linked. This hazard-specific information will enable users to determine which hazards are most common at each volcano, based on past activity, and also the impacted spatial extent.
In order to translate hazard into risk simple measures of vulnerability will be added, including population densities, building types, locations of critical infrastructure and level of monitoring. This will enable multi-scale risk mapping to identify those areas at greatest risk from future volcanic activity and so highlight where future efforts should be focussed.
The LaMEVE database is currently based largely on historical information and terrestrial geological records of Quaternary volcanoes. However, there is the potential to add information from tephra deposits in marine sediments and from indications of explosive volcanism in ice cores (e.g. from sulphate anomalies). Challenges in incorporating these data include the estimation of eruption magnitude and determination of the source volcano.
The LaMEVE database is to be made publically accessible at the time this paper is published as v1.0. For Holocene eruptions, LaMEVE data not already included in the GVP database will be imported by GVP where it will be maintained and updated in collaboration with VOGRIPA and GVM. The GVP database has been restructured for this purpose and will be available for search and download. This partnership prevents divergence and redundancy, and the division of labour will accelerate progress on both databases. The Pleistocene eruptions will be subsequently regularly updated by VOGRIPA. The current plan calls for annual updates (i.e. v2.0 released in 2013) but if other updates are required, they will be denoted as sub-versions (e.g. v1.1). There will be three mechanisms of adding new data, updating existing entries and correcting errors. Firstly, as VOGRIPA and GVM are funded until the end of 2014, GVM researchers will continue to search for and incorporate new data and make corrections when errors are identified. Secondly, researchers can send new data and modifications and draw attention to errors by contacting the database manager identified on the website. Thirdly, researchers can enter data after being given clearance as a GVM user. This data will still be checked for validity and consistency by the database manager. Only the current version of the database will be available to the public; the evolving version will not be made public prior to specified release dates when it will replace the earlier version.
The principal difficulty in creating a database with such a wide scope is compiling information. There are two main issues. First, the data may not actually exist, either due to a lack of geological investigations or because data are unpublished. Second, not all published materials are easily accessible (either because of journal subscription or language issues). There are also potentially relevant data published in the ‘grey literature,’ which may also be inaccessible to academics. These concerns emphasise the value of opening the database to additional scientific contributions as undoubtedly more data exist than have been found thus far.
It is evident from even a basic analysis of the data in the database that under-recording of eruptions over time, particularly those of lower magnitudes, is a considerable problem. This will be discussed in detail in a forthcoming companion paper, and also in Deligne et al. (2010) using just the Holocene record.
Comparisons between the data are complicated by the fact that there are numerous data types as well as a mix of collection methods. For example, eruption dates can be historical or geological, which have notably different accuracies. Furthermore, a number of methods are used to determine certain eruption characteristics, such as eruption size, which complicates comparisons. Differences in data accuracy are unavoidable, particularly over the timescale covered in the database; it is the responsibility of users to take this into consideration.
Any database of this kind will, and should, evolve as more data become available and errors are corrected. Studies which use this database will need to be explicit about which version was used. Every published database will be archived to allow comparison of analyses. The development, updating and archiving of databases will require considerable effort and resources and should be sustained.
The LaMEVE database contains nearly 3,000 Quaternary volcanoes and just under 2,000 explosive eruptions with magnitude ≥4 spanning the last 1.8 My. It constitutes the first part of the larger VOGRIPA database and is accessible online at http://www.bgs.ac.uk/vogripa. The most common types of dates stored are historical events (238) and radiocarbon dates (558). An analysis of patterns, relationships and under-recording issues in the dataset will be published separately.
The database constitutes a major resource for those conducting research or looking for information on large magnitude explosive eruptions from around the world as it synthesises data from a wide range of sources. It is available via an easy-to-use web interface with the facility to download data. The database will be maintained and updated within the GVM project with opportunities for the volcanological community to add new data and identify errors and make corrections. The design permits future expansion, so that hazard-specific information can be stored as well as vulnerability data, which will enable global risk assessments to be carried out.
Availability and requirements
The database is available at http://www.bgs.ac.uk/vogripa with no restrictions on access.
aAn automatically generated unique code (typically numerical) assigned to each row in the table to enable cross-referencing to each record.
bIgnimbrite’ refers to both pyroclastic flow and pyroclastic surge deposits.
cFrom Figure 3, the assumed densities are applied as following to each rock types: P/T/R = 2,300 kg/m3; D = 2,400 kg/m3; A/Y/Z = 2,500 kg/m3; F/X/B = 2,700 kg/m3.
The authors would like to acknowledge the funding bodies for this project: the European Research Council (VOLDIES grant), the Natural Environment Research Council (Global Volcano Model grant), the British Geological Survey and also Munich Re in the initial stages. We also thank Hayley Dunning for her input in the early data-collection stages of LaMEVE as well as work done by summer students Michael Hodge and Lucy Harper.
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