The magnitude 7.1 event occurred about 34 hours after and about 7 miles northwest of a magnitude 6.4 foreshock on … 5) exposed fault strands that bound both sides of the linear valley. near Johannesburg (Searles Valley) SLIP RATE: between 2 and 11 mm/yr; probably averages about 7 mm per year INTERVAL BETWEEN MAJOR RUPTURES: between 200 and 3000 years, depending on the fault segment PROBABLE MAGNITUDES: M W 6.8 - 7.6 OTHER NOTES: The Garlock fault zone is one of the most obvious geologic features in … The Garlock fault extends from the San Andreas Fault in the west to Death Valley in the east, and hasn’t had a major earthquake in about 500 years.

While no earthquake has produced surface rupture on the Garlock fault in historic times (although cracks opened along a short segment of the fault in 1952, due to the shaking of the Kern County earthquake, and groundwater removal has also triggered slip in the Fremont Valley area), there have been a few sizable quakes recorded along the Garlock fault zone. On the 4th of July 2019, the magnitude-6.4 Searles Valley earthquake rattled the region around Ridgecrest, California. [5] The El Paso Peaks paleoseismic site was first studied by McGill and Rockwell [1998], and it is the focus of this study. Searles Valley is an ∼450 km 2 teardrop-shaped valley located north of the Garlock fault in the southwestern Basin and Range. 200-750 years in Searles Valley, about 200-1300 years in Pilot Knob Valley, and about 200-3000 years near Leach Lake and in the Avawatz Mountains. The foreshock originated along a strike-slip fault in the Eastern California Shear Zone, a region frequented by earthquake swarms, near the edge of Death Valley … Garlock Fault Zone map. In conjunction with available slip rates for the Garlock fault, the geomorphic offsets suggest that average recurrence intervals are probably within the range of 600–1200 years south of El Paso Mountains, about 200–750 years in Searles Valley, about 200–1300 years in Pilot Knob Valley, and about 200–3000 years near Leach Lake and in the Avawatz Mountains.Published versio We were all put on alert. Red lines indicate previously mapped faults. Trenches T-9a and T-9b were located on the southern part of a linear valley, Trench T-10 was extended across a linear fault scarp on the north side of the valley (Fig. (?) Paleoseismic Results from the Christmas Canyon West Site, Central Garlock Fault, Searles Valley, California Kyle A. Peña, Sally F. McGill, Ed J. Rhodes, James F. Dolan, Nathan D. Brown, Bryan A. Castillo, Alexandra E. Hatem, Sourav Saha, & Robert Zinke Submitted August 15, 2019, SCEC Contribution #9831, 2019 SCEC Annual Meeting Poster #107 Like all of California, the Central Valley—which is ringed by faults—is earthquake country. Southern California was just rocked by two major earthquakes only 34 hours and ~7 miles (11 km) apart. It has a hot, arid climate. The Garlock fault is well expressed in the Campo Teresa area. When we sum up the earthquake probability along the entire length of the Garlock Fault, the main fault that runs perpendicular to the Ridgecrest faults, we estimate a 2.3% chance of a magnitude-7.7 Garlock Fault rupture in the next year — in other words, one chance in 43. Below This groundwater basin underlies Searles Valley in portions of San Bernardino, Inyo, and Kern Counties. September 2019 Conference: 2019 SCEC Annual Meeting Poster #107 5). "Some aftershocks have rumbled northwest of the Searles Valley earthquake, approaching the Owens Valley fault. The July 5, 2019 magnitude 7.1 earthquake near eastern California’s Searles Valley resulted from shallow strike-slip faulting in the North America plate crust. Searles Valley. / Image: SCEC screenshot of USGS Recent Earthquakes Map. The left-lateral Garlock Fault, 250 km long, bounds Searles Valley on the south and is the most geologically significant fault in the area. Garlock Fault Zone. If part of the offset of the shoreline occurred during older lakestands, then the slip rate may be somewhat less. Searles Valley Earthquake Sequence including aftershocks as of July 9th, 2019 at 3:00 PM PT. The Searles Valley fault (W-directed normal fault) transfers slip onto the Panamint Valley zone, which changes from dominantly NNW-trending dextral strike-slip to more normal motion where they join. Stretching for 250 kilometers (160 mi), it is the second-longest fault in California and one of the most prominent geological features in the southern part of the state . Trenches T-9a and T-10 (Fig. An M6.4 foreshock in the region between the Searles Valley and Ridgecrest on July 4 was quickly followed by a significantly more powerful M7.1 mainshock on July 5. INTRODUCTION fault that accommodates extension in the Basin and Range The Garlock fault is one of the principal active faults of province, north of the fault, relative to the more stable Mojave California. It displaces several of the mapped units of late Quaternary age but does not displace active or older alluvium deposits of late Holocene age. Geography. 2, inset). Some aftershocks have rumbled northwest of the Searles Valley earthquake, approaching the Owens Valley fault. This section does not cite any sources. Searles Valley - Owlshead Mountains. Mostly built-up after the 1940s, the directly hit community of Ridgecrest may have come out better than others due to its relatively recent construction and sparse and rural population. The valley is bound on the west by the Argus Range and on the east by the Slate Range (Fig. PDT (17:33 UTC) 7.5 mi (12.1 km) southwest of Searles Valley. Shaking can begin suddenly but have lasting impacts. Lithology and Stratigraphy. But a network of smaller faults in this region also pose a major earthquake hazard, not only because they can themselves generate large quakes, but because shaking along one fault can cause others to come to life. The most populated area near the epicenter was Ridgecrest, home to 28,000 people. The maximum slip rate of the Garlock fault in southeastern Searles Valley is thus 11 mm/ 14 C yr. Perspective view of Garlock Fault. Searles Valley Groundwater Basin • Groundwater Basin Number: 6-52 • County: Inyo, Kern, San Bernardino • Surface Area: 197,000 acres (308 square miles) Basin Boundaries and Hydrology . A large quake on the Garlock fault has the potential to send strong shaking to the San Fernando Valley, Santa Clarita, Lancaster, Palmdale, Ventura, Oxnard, Bakersfield and Kern County, one of … MLRA 30g. Paleoseismic Results from the Christmas Canyon West Site, Central Garlock Fault, Searles Valley, California. [1992] documented four paleoearthquakes on the Garlock fault in Searles Valley and showed that the most recent earthquake was younger than a radiocarbon date within the range 1490–1810. California's Garlock fault line, was jostled into moving for the first time on record. The Owens Valley fault runs roughly northwest-southeast starting near the northern tip of the Ridgecrest fault, and it last ruptured in a large earthquake (about M7.8) in 1872. The Garlock Fault is a left-lateral strike-slip fault running northeast–southwest along the north margins of the Mojave Desert of Southern California, for much of its length along the southern base of the Tehachapi Mountains. TYPE OF FAULTING: ... 1500 A.D. Andrew and I went to checkout the earthquake damage from the 7.1 and 6.4 quakes that hit the Searles valley, Ridgecrest, and Trona. The San Andreas fault system is to the west, the Garlock fault is to the south and the faults of the Sierra Nevada are to the east. The Garlock Fault marks the northern boundary of the area known as the Mojave Block, as well as the southern ends of the Sierra Nevada and the valleys of the westernmost Basin and Range province. Our homes and towns here in the Mountain Communities are built on the San Andreas fault. This subsection includes the Slate Range, El Paso Mountains, Quail Mountains, Owlshead Mountains, southern ends of the Argus and Panamint Ranges, Searles Valley, Long Valley, and the southern end of Panamint Valley. Moving for the first time on record the most populated area near the epicenter was Ridgecrest, California our and! 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