In designing this project we hoped to cast a wide net over seismological phenomena occurring at volcanoes. We found that the net had many holes; only very few parameters are frequently reported in the literature. Filling in the blanks of this current version of the database would be highly desirable. We believe that much of this data exists, but was never published. The next step is to contact the individual reporters and begin collecting this primary data.
The database would be improved by the addition of new high quality records. The number and quality of case studies on volcanic earthquake swarms have been steadily improving as more volcanoes are becoming monitored. The addition of the most recent swarms (occurring after 1989) will be given priority over the cases studied before 1979.
Along with the addition of more records, each record could be expanded to included summary figures such as; seismicity rate, time-depth, time-magnitude, earthquake location, and example seismograms. The database software that we are currently using does support fields that contain digital images. Future versions of the GVESD will incorporate these figures.
Future work with the GVESD will explore more fully the relationship between swarm parameters (such as the duration, Mmax, and event types) and specific eruption parameters such as the Volcanic Explosivity Index, chemistry of the erupted products, eruption repose, volcano edifice height, etc. We are developing a generic volcanic earthquake swarm model which will provide a conceptual framework to interpret sequences or swarms of volcanic earthquakes which involve several different types of events. The GVESD will provide the data to explore the succession of particular event types within swarms and their durations.
We thank J. Lahr and C. Nye for providing helpful comments and suggestions which improved this report. We also thank L. Siebert for providing an advance of copy of the second edition of Volcanoes of the World. This work was supported by the Alaska Volcano Observatory under the US Geological Survey Volcano Hazards and Geothermal Studies Program, and by additional funds from the State of Alaska.
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