LOCATION OF CRUSTAL FRACTURED ZONES USING A FORMAL ALGORITHM ON GRAVITY AND TOPOGRAPHIC DATA

Abstract

We studied crustal fracturing in California from topography and Bouguer gravity anomalies using a formal algorithm for identifying linear features from the values of geophysical fields on a regular grid. Some of the linear features thus identified coincide with known faults. They may be interpreted as boundaries of geologic units which are deep-seated when based on Bouguer anomalies and shallow when using altitude data. Areas are predicted where horizontal faults may be situated. Low ($M\ge 3$) and high ($M>6$) seismicity are shown to be associated with areas where the crust has been found to be fractured.

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Computational Seismology, Vol. 3.