Initial Mapping Along the Central Reach of the Pinto Mountain Fault Zone, Southern California, Reveals New Insights Into Tectonics and Paleohydrography

Dudash, Stephanie L.

doi:10.1130/abs/2019am-342032

Cited by 1 publication

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“…Slip rates are reported in mm/yr at sites bp = Biskra Palms (Behr et al., 2010), ep = Eureka Peak (Hislop, 2019), mv = Morongo Valley (Gabriel, 2017), om = Oasis of Mara (Cadena, 2013), pc = Pushawalla Canyon (Blisniuk et al., 2021), tp = Thousand Palms (Fumal et al., 2002), ww = Whitewater (Gold et al., 2015). Active study sites are cm = Copper Mountain (Dudash, 2019), mc = Mission Creek (Waco & Blisniuk, 2019), and tnp = Twentynine Palms (Menges & Dudash, 2019). Focal mechanisms from the USGS earthquake catalog.…”

Section: Introductionmentioning

confidence: 99%

Steady Long‐Term Slip Rate on the Blue Cut Fault: Implications for Strain Transfer Between the San Andreas Fault and Eastern California Shear Zone

Guns

Bennett

Blisniuk

et al. 2022

Geophysical Research Letters

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The San Andreas plate boundary fault system comprises dozens of faults that accommodate shearing between the Pacific and North America plates. Quantifying the time-dependent seismic hazards presented by this network is a major goal of active tectonics research and requires both a detailed accounting of slip recorded by the major throughgoing faults (e.g., the San Andreas Fault (SAF)), and an understanding of the roles played by subsidiary faults in the system. These secondary faults not only present their own seismic hazards, but may also affect the seismic hazard and earthquake potential of neighboring faults (e.g., Fletcher et al., 2016). One of the most geometrically complex regions of the San Andreas plate boundary system lies northeast of Palm Springs, CA, where three zones of deformation connect: the SAF zone, the Eastern Transverse Ranges (ETR) province and the Eastern California Shear Zone (ECSZ). Slip accommodated by the Coachella Valley section of the SAF splits among three separate fault strands as it approaches the San Bernardino Mountains (Figure 1), while due east of the Coachella Valley the ETR comprises a series of E-W-trending left-lateral faults. Paleomagnetic data and palinspastic reconstructions suggest that these faults have accommodated 20-40° of clockwise block rotation over their <7 Ma lifetimes (Carter et al., 1987;Powell, 1993) in conjunction with slip on the SAF. In addition, the rotation of the ETR province has likely helped distribute localized right-lateral slip on the SAF system to the ECSZ, a zone of distributed, NW-trending, right-lateral faults in the Mojave Desert (Dickinson, 1996). The ECSZ has experienced strong recent seismicity, including three of the four M W > 7.0 earthquakes to strike southern California in the last 50 years (i.e., the 1992 M W 7.

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