Preliminary analysis of digital seismograms from the Mammoth Lakes, California, earthquake sequence of May-June 1980

Three earthquakes with M_L ≥ 6.0 occurred near Mammoth Lakes, California on May 25, 1980 (M_L = 6.1 at 1633 UTC, M_L = 6.0 at 1649, and M_L = 6.1 at 1944) followed by a M_L = 6.2 shock on May 27 (1450 UTC) (Urhammer and Ferguson, 1980). The U.S. Geological Survey responded by undertaking an aftershock study using portable digital event recording seismographs. Our main goal was to get unclipped recordings of one or more large aftershocks.