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Azimuth and slowness anomalies of seismic waves measured on the central California seismographic array. Part II. Interpretation

SEISMOGRAPHIC STATION UNIVERSITY OF CALIFORNIA, BERKELEY, CALIFORNIA

Abstract

An interpretation is given here of the azimuth and slowness anomalies for P waves measured on the seven northern stations in the telemetry seismographic array in central California which was described in Part I of this paper. The array provides a new method of investigating the structure of the upper mantle in an important oceanic-to-continental transition region. The structural feature which is primarily responsible for these anomalies is apparently located in the upper mantle within a depth of order 100 km of the surface. Examination shows that if these anomalies are attributed to a thickening crust alone, a dip of the Mohorovii discontinuity as steep as 20° must be assumed. Further analysis suggests a solution having a moderately dipping Mohorovii discontinuity below which a second, deeper interface has a velocity decrease downward and a steep dip toward the ocean.

An alternative hypothesis to that of Press and Biehler is formulated which explains traveltime anomalies of certain California stations in terms of a regional structural trend.

Footnotes

^* Now at Carnegie Seismic Analysis Center, Ave. Arequipa 2895, Lima, Peru.

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