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Published December 1982 | Published
Journal Article Open

The Santa Barbara, California, earthquake of 13 August 1978


The 5.1 M_L Santa Barbara earthquake of 13 August 1978 occurred at 22h54m 52.8s UTC. The epicenter was located 3 km southeast of Santa Barbara at 34° 23.9′N latitude and 119°40.9′W longitude with a focal depth of 12.7 km. The main shock was followed between 13 August and 30 September by 373 aftershocks that were located with the Caltech-USGS array. The aftershock zone extended 12 km WNW from the epicenter and was 6 km wide in the N-S direction, and it had a very clear temporal development. During the first 20 min of activity, all the aftershocks were located in a cluster 7 km WNW of the main shock epicenter. During the next 24 hr, the aftershock zone grew to 11 km in the WNW direction and 4 km in the N-S direction. During succeeding weeks, the zone extended to 12 by 6 km. This temporal-spatial development relative to the main shock epicenter may indicate that the initial rupture propagated 7 km unilaterally to the WNW, and the initial rupture plane may have been considerably smaller than the eventual aftershock zone. This smaller area suggests that the stress drop may have been significantly greater than that derived from the final aftershock zone. In cross section, the aftershock hypocenters outline a nearly horizontal plane (dipping 15° or less) at 13 km depth. The main shock focal mechanism indicates NNE-SSW compression and vertical extension. The preferred fault plane strikes N80°W and dips 26°NNE, indicating north-over-south thrusting with a component of left-lateral movement. Focal mechanisms for 40 aftershocks also indicate compression in the general N-S direction. For most of these events, the north-dipping nodal plane dips between 7° and 45°, with most dipping 25° or more, which is significantly steeper than the plane delineated by the hypocenters themselves. These observations are consistent with a tectonic model in which much of the slip during the Santa Barbara earthquake occurred on a nearly horizontal plane. The after shocks then might represent movement on a complex series of imbricate thrust faults that flatten into the plane of primary slip. Hence, the Santa Barbara earthquake may be taken as evidence for mid-crustal horizontal shearing in the western Transverse Ranges.

Additional Information

© 1982 Seismological Society of America. Manuscript received 14 July 1982. We thank Ken Piper, T. L. Teng, and T. L. Henyey for making the USC data available to us. We thank Barbara Bogaert and William Prothero for data regarding the UCSB seismic refraction line. We thank C. R. Allen for guidance in this study and advice on the manuscript. We are also grateful to Rob Cockerham, Tom Hearn, Dave Hill, Hiroo Kanamori, Barry Keller, Bernard Minster, Jim Pechmann, Bill Prothero, Kerry Sieh, Lee Silver, Terry Wallace, and Randy White for helpful discussion and comments on the manuscript. This work was supported by USGS Contracts 14-08-0001-19270 and 14-08-0001-16719.

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