Global Volcanic Earthquake Swarm Database 1979-1989

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Technical Report

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Earthquake swarms are pervasive at volcanoes, but have seldom been studied systematically. Most swarms that are described in the literature are those that occurred in association with eruptions; indeed, earthquake swarms are the most reliable method of forecasting eruptions. For the purpose of this report, a swarm is defined as many earthquakes of the same size occurring in a small volume. Swarms are different in these two ways from a mainshock-aftershock sequence or a foreshock-mainshock-aftershock sequence (fig. 1). Swarms are especially common in volcanic areas.

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Global Volcanic Earthquake Swarm Database 1979-1989, USGS Open-File Report, 96-69, 333 p.