Restraining segments and reactivation of the Santa Monica-Dume-Malibu Coast fault system, offshore Los Angeles, California

Publication Status is "Submitted" Or "In Press: 
LDEO Publication: 
Publication Type: 
Year of Publication: 
2006
Editor: 
Journal Title: 
Journal of Geophysical Research-Solid Earth
Journal Date: 
Nov 14
Place Published: 
Tertiary Title: 
Volume: 
111
Issue: 
B11
Pages: 
-
Section / Start page: 
Publisher: 
ISBN Number: 
0148-0227
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:000242177900001
LDEO Publication Number: 
Call Number: 
Abstract: 

[ 1] A regional west striking system of surface and blind faults transects northern metropolitan Los Angeles, separating the Santa Monica Mountains from two deep sedimentary basins. The surface faults include the Santa Monica, Dume, and Malibu Coast faults. The three-dimensional (3-D) geometries of these faults and deformed dated strata were examined in order to determine how oblique shortening is accommodated, how structural relief grows along a mountain front, and how block translation is related to block rotation. Industry seismic reflection, well, and outcrop data were used to construct digital structure-contour maps of several of these faults and three stratigraphic horizons that intersect them. These maps, swath bathymetry, digital elevation models, and seismicity were incorporated into a 3-D digital database. Modeling included new approaches to determining strike-slip displacement by separate analyses of shortening and structural relief in a restraining double bend. Stratigraphic thicknesses indicate Miocene extension across the Santa Monica and Dume faults, which have been reactivated as a single or linked moderately dipping arcuate fault that accommodates one coherent block motion via left-lateral and left-reverse displacement. Modeling indicates 5 km (+8/-1 km) of left-lateral displacement on part of the Santa Monica - Dume fault and similar to 11 degrees of clockwise rotation of the Santa Monica Mountains during the last similar to 4 +/- 1 m.y. Modern displacement rates modeled from GPS data are similar to our modeled post-similar to 4 Ma rates of westward escape and clockwise rotation of the Santa Monica Mountains.

Notes: 

107NITimes Cited:0Cited References Count:91

DOI: 
Doi 10.1029/2005jb003632