High-resolution seismic reflection profiling of the Santa Monica Fault Zone, West Los Angeles, California

Details High-resolution seismic reflection profiling of the Santa Monica Fault Zone, West Los Angeles, California High-resolution seismic reflection profiling of the Santa Monica Fault Zone, West Los Angeles, California

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2051d&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 16, p. 2051-2054

Physics

6

Tectonophysics: Plate Boundary-General, Tectonophysics: Continental Tectonics-General

Scientific paper

High-resolution seismic reflection data obtained across the Santa Monica fault in west Los Angeles reveal the near-surface geometry of this active, oblique-reverse-left-lateral fault. Although near-surface fault dips as great as 55° cannot be ruled out, we interpret the fault to dip northward at 30° to 35° in the upper few hundred meters, steepening to >=65° at 1 to 2 km depth. A total of ~180m of near-field thrust separation (fault slip plus drag folding) has occurred on the fault since the development of a prominent erosional surface atop ~1.2Ma strata. In the upper 20 to 40 m strain is partitioned between the north-dipping main thrust strand and several closely spaced, near-vertical strike-slip faults observed in paleoseismologic trenches. The main thrust strand can be traced to within 20 m of the ground surface, suggesting that it breaks through to the surface in large earthquakes. Uplift of a ~50,000-year-old alluvial fan surface indicates a short-term, dip-slip rate of ~0.5mm/yr, similar to the ~0.6mm/yr dip-slip rate derived from vertical separation of the oxygen isotope stage 5e marine terrace 3 km west of the study site. If the 0.6 mm/yr minimum, dip-slip-only rate characterizes the entire history of the fault, then the currently active strand of the Santa Monica fault probably began moving within the past ~300,000 years.

Affiliated with

Also associated with

No associations

Rating

High-resolution seismic reflection profiling of the Santa Monica Fault Zone, West Los Angeles, California does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with High-resolution seismic reflection profiling of the Santa Monica Fault Zone, West Los Angeles, California, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-resolution seismic reflection profiling of the Santa Monica Fault Zone, West Los Angeles, California will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-805292