Earthquake swarms are spatio-temporal seismicity clusters that exhibit a gradual rise and fall in seismic moment release, lacking any well-defined mainshock-aftershock sequence (Yamashita 1998). Swarms are common in volcanic regions, where they typically persist for several months or years and generally have maximum event magnitudes of less than 4. Earthquake swarms also occur in nonvolcanic settings and are often classified according to their area of occurrence (Press and Siever 2001). Kurz et al. (2004) have suggested, however, that all tectonic settings may share a common physical generation mechanism for earthquake swarms. Some swarms may...

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