Open AccessPreliminary Results on the 3‐dimensional Seismic Structure of the Lithosphere under the USGS Central California Seismic Array
Author(s) -
Husebye Eystein S.,
Christoffersson Anders,
Aki Keiiti,
Powell Christine
Publication year - 1976
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1976.tb04161.x
Subject(s) - geology , seismometer , seismology , lithosphere , asthenosphere , anomaly (physics) , seismic tomography , fault (geology) , inverse , inverse theory , seismic array , geodesy , tectonics , geophysics , geometry , mantle (geology) , mathematics , physics , condensed matter physics , oceanography , deformation (meteorology)
About 1500 readings of teleseismic P ‐time residuals obtained from the US Geological Survey seismograph network in central California have been used to obtain a three‐dimensional image of seismic velocity anomalies for this area by the method of Aki, Christoffersson & Husebye We found that the California network is less suitable than the LASA and NORSAR arrays for this kind of studies because of its greater proportion of peripheral blocks in which the resolution is very poor for the stochastic inverse solution and the random error effect is severe for the generalized inverse solution. Nevertheless, the resultant velocity anomalies show a remarkable correlation with the San Andreas fault zone to a depth of 75 km. The anomaly pattern changes drastically as the depth exceeds 75 km, suggesting that the asthenosphere has been reached.