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Source mechanism of the Truckee, California, earthquake of September 12 1966

DEPARTMENT OF EARTH AND PLANETARY SCIENCES MASSACHUSETTS INSTITUTE OF TECHNOLOGY, CAMBRIDGE, MASSACHUSETTS

Abstract

With additional data on P wave polarities, the existing fault plane solution for the Truckee, California, earthquake of September 12 1966 (Ryall, Van Wormer and Jones, 1968) is revised to have the following strike and dip angles for its nodal planes:

Nodal plane A is shown to agree very well with the aftershock zone determined by Greensfelder (1968).

The observed Rayleigh and Love wave amplitude spectra from four WWSSN stations in the eastern United States are consistent with the revised solution, but not with the original one by Ryall et al. From these data, the focal depth and seismic moment of the earthquake are determined as 10 km and 0.83 x 10²⁵ dyne-cm, respectively. The focal depth so obtained is the same as that determined from the near station travel time data by Ryall et al. The seismic moment is used to give a minimum estimate of about 30 cm for the average dislocation of the fault.

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