1. swarm earthquakes
Wikipedia definition
2. Earthquake swarmEarthquake swarms are events where a local area experiences sequences of many earthquakes striking in a relatively short period of time. The length of time used to define the swarm itself varies, but the United States Geological Survey points out that an event may be on the order of days, weeks, or months. They are differentiated from earthquakes succeeded by a series of aftershocks by the observation that no single earthquake in the sequence is obviously the main shock.
Read “Earthquake swarm” on English Wikipedia
Read “群発地震” on Japanese Wikipedia
Read “Earthquake swarm” on DBpedia


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