Observational Analysis of the Origin
of Non-Double Couple Seismic Sources
Principal Investigator: Cliff Frohlich
Funded by: Air Force
Radiation from many earthquake sources cannot be explained solely as being due to slip
along a simple planar fault. These "anomalous" sources are most likely caused by
multiple events occurring on appropriately oriented, nonparallel faults or be attributed
to systematic problems with the source determination process, e.g. errors caused by
near-source structure. Understanding these events is of special importance both because it
may elucidate the mechanics of the earthquake source process, and also because events with
such anomalous sources might be misidentified as explosions, or, explosions might be
misidentified as earthquakes with anomalous sources. This project is to investigate the
nature of these anomalous earthquake sources by investigating earthquakes in pairs-for
each anomalous event one or more nearby event with a well determined double-couple source
mechanism is found.
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