Depth of the Moho in northern Baja California using (Pg-Pn)

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Authors:Reyes, Luis M.; Rebollar, Cecilio J.; Castro, Raúl
Author Affiliations:Primary:
CICESE, Centro de Investigació Cientrífica y de Educación Superior de Ensenada, Ensenada, Mexico
Volume Title:Geofísica Internacional
Source:Geofísica Internacional, 40(1), p.21-29. Publisher: Instituto de Geofísica, UNAM, Mexico, D.F., Mexico. ISSN: 0016-7169
Publication Date:2001
Note:In English with Spanish summary. 8 refs.; illus., incl. geol. sketch maps, 2 tables, sect.
Summary:Mean Moho depths along the axis of the Peninsular Ranges in northern Baja California are obtained from refracted waves of events in northern Baja California recorded on an array of 9 broadband seismic stations across the northern Baja California Peninsula at about latitude 31°N. We used 35 events located with RESNOM (Red Sismica del Noroeste de Mexico) and RANM (Red de Acelerografos del Noroeste de Mexico) local data. Focal depths range from 3 to 15 km and magnitudes from 2.1 to 3.9. A 1-D velocity model (Nava and Brune, 1982) was used to calculate theoretical travel times of Pg and Pn for different Moho depths. The differences between observed and theoretical (Pg-Pn) travel times was minimized in an iterative process in order to find the most likely Moho depth along the axis of the Peninsular Ranges between latitudes 31.3° and 31.7°N. It was found that the average Moho depth is approximately 42±3 km in the western Peninsular Ranges, diminishing to 31±3 toward the west along the Pacific Ocean and to 20±3 km toward the Gulf of California. [R.A.H.]
Sections:Physical properties of rocks and minerals
Subjects:Body waves; Elastic waves; Geophysical methods; Mohorovicic discontinuity; P-waves; Refraction methods; Seismic methods; Seismic networks; Seismic waves; Seismicity; Traveltime; Baja California; Mexico; Peninsular Ranges
Coordinates:N312000 N314200 W1140000 W1180000
Abstract Numbers:01M/4728
Record ID:2003028256
Copyright Information:GeoRef, Copyright 2020 American Geosciences Institute.
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