Earthquake sequences and seismicity of the Watsonville Region of Central California



The Watsonville area designates here the region of
Central California between the latitude 36°40' and 37°05' N and the longitudes
121°25' and 121°50' W. This area can be considered as a regional
seismic unit. The seismic activity during the years 1960-1966 gives a
background level of 2 or 3 earthquake of magnitude 2 < il/ ^ 3, per month,
with periods of increased activity associated with the occurrence of larger
shocks. The presence and nature of sequences of earthquakes in the area is
investigated for the period 1952-1966. Three sequences in 1963 are studied
in more detail. Tentatively the sequences of the area are grouped
in three general types.

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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X