Source parameters of the 1980 Mammoth Lakes, California, earthquake sequence.

Abstract

From the >1500 Mammoth Lakes earthquakes recorded on three-component digital seismographs (Spudich et al 1981), 150 were used in an analysis of the locations, mechanism, and source parameters. A composite fault plane solution of nine earthquakes 3.9= or <5.1 defines a right-lateral strike slip mechanism on a steeply dipping nearly E-W plane striking S75oE or left-lateral strike slip on a nearly N-S plane striking N10oE. Vertical cross sections of well-located aftershocks indicate possibly three E-W planes that coincide with the locations of the four largest earthquakes with ML= or >6.0. Using the spectral analysis of S waves (Brune, 1970), source parameters for 67 earthquakes were determined.-Authors