Long-period earthquakes in the Long Valley caldera region, eastern California

Details Long-period earthquakes in the Long Valley caldera region, eastern California Long-period earthquakes in the Long Valley caldera region, eastern California

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.1679p&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 16, p. 1679-1682

Mathematics

Logic

22

Calderas, California, Earthquakes, Seismic Waves, Seismology, Tectonics, Volcanoes, Volcanology, Crustal Fractures, Geological Faults, Magma, P Waves, S Waves

Scientific paper

Most earthquakes occurring near Long Valley caldera since the onset of recurring swarm activity in 1980 have the broad-band signature typical of tectonic or volcano-tectonic earthquakes with impulsive, high-frequency P and S waves. With the Mammoth Mountain earthquake swarm in mid 1989, we began detecting occasional events with a marked deficiency in energy above 5 Hz, a feature typical of long-period (LP) volcanic earthquakes. These events occur beneath the southwest flank of Mammoth Mountain at focal depths ranging from 10 to 28 km, distinctly deeper than the 2- to 10-km depth range for tectonic earthquakes in the area. The LP events occur at intervals ranging from weeks to months. Individual occurrences typically consist of several events within 2 to 5 minutes where the largest event has never been first. Magnitudes range from 0.5 to 1.8. The mid-crustal focal depths of the LP events are similar to occurrence at a number of areas with Holocene volcanism in Japan and the western United States. They may indicate the movement of magmatic fluids but do not necessarily indicate an imminent volcanic eruption.

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