Shallow seismic imaging of folds above the Puente Hills blind-thrust fault, Los Angeles, California

Details Shallow seismic imaging of folds above the Puente Hills blind-thrust fault, Los Angeles, California Shallow seismic imaging of folds above the Puente Hills blind-thrust fault, Los Angeles, California

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29i..18p&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 9, pp. 18-1, CiteID 1304, DOI 10.1029/2001GL014313

Mathematics

Logic

8

Seismology: Seismicity And Seismotectonics, Seismology: Seismic Hazard Assessment And Prediction, Seismology: Paleoseismology

Scientific paper

High-resolution seismic reflection profiles image discrete folds in the shallow subsurface (<600 m) above two segments of the Puente Hills blind-thrust fault system, Los Angeles basin, California. The profiles demonstrate late Quaternary activity at the fault tip, precisely locate the axial surfaces of folds within the upper 100 m, and constrain the geometry and kinematics of recent folding. The Santa Fe Springs segment of the Puente Hills fault zone shows an upward-narrowing kink band with an active anticlinal axial surface, consistent with fault-bend folding above an active thrust ramp. The Coyote Hills segment shows an active synclinal axial surface that coincides with the base of a 9-m-high scarp, consistent with tip-line folding or the presence of a backthrust. The seismic profiles pinpoint targets for future geologic work to constrain slip rates and ages of past events on this important fault system.

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