Parkfield Earthquakes June 28-29, 1966

Abstract

The Parkfield earthquake produced an instrumentally recorded acceleration of 0.5g but caused little structural damage because of the short duration of the maxima. Remeasurements of geodetic lines established in the area six months prior to the earthquake indicate approximately seven in. of right-lateral movement along the San Andreas fault.

Parkfield, California, earthquake of June 27, 1966: A three-dimensional moving dislocation

“…The buried fault model for the Parkfield earthquake was further investigated by Scholz et al (1969), who postulated a fault model 40 km long extending from a depth of 4 km to a depth of 10 km and having a dislocation amplitude of 30 cm. Although their model agrees favorably with the distribution of aftershocks (Eaton et al, 1970) and creep following the earthquake (Wallace and Roth, 1967;Smith and Wyss, 1968), it underestimates the geodetic displacements by a factor of about 2 (Morrison et al, 1966).…”

“…In this paper, we attempt to resolve some of the controversial results summarized above by fitting a moving dislocation model to strong-motion data obtained from five stations (Trifunac et al, 1973b) and the post-earthquake static field measured by the geodetic pentagon across the San Andreas Fault (Morrison et al, 1966).…”

“…4) and Bench (no. 5) (Morrison et al, 1966). Following the Parkfield earthquake, the Department of Water Resources (1968a, b) remeasured this network in July, 1966.…”