First posted April 25, 2023 For additional information, contact: Director,California Water Science CenterU.S. Geological Survey6000 J Street, Placer HallSacramento, California 95819 Hydrologic and geophysical data were collected to support updates an existing groundwater-flow model of Hinkley Valley, California, in the Mojave Desert about 80 miles northeast Los Angeles, California. These provid...

Abstract —Lacustrine sediments, related subaerial aeolian sands, as well fluvioglacial sands enclosed in ablation moraines the Chuya River valley between and Kurai basins Gorny Altai, have been dated by optically stimulated (OSL) infrared (IRSL) luminescence. The OSL IRSL ages indicate that formation of lake, which spread into Basin, was caused Sukor rockslide dammed Valley. triggered a large e...

Crustal deformation and seismicity in the Levant region are mainly related to plate-boundary Dead Sea Fault (DSF) intraplate Carmel−Gilboa−Faria System (CGFS). The intersection between these two major fault systems is generally treated as a ∼35-km-wide belt stretched Faria Gilboa Faults. Here, we present spatial temporal analysis of faulting near this intersection. Our based on new geological m...

Abstract Recognition of a pair pre-Neogene markers together with analysis published data indicate ?40 km dextral slip across the southern Death Valley fault zone, California, USA. Stratigraphic overlaps on rocks much predates late Miocene, placing significant fraction in same time window as regional extension and challenging interpretations that modern strike-slip system became active post–6–3 ...

S U M M A R Y We invert for the state of stress in the southern California crust using a catalogue of high quality earthquake focal mechanisms (1981–2010). The stress field is best resolved where seismicity rates are high and sufficient data are available to constrain the stress field across most of the region. From the stress field, we determine the maximum horizontal compressive stress (SHmax...

The Coyote Creek fault is a major strand of the San Jacinto fault zone in southern California. Pleistocene sediments and sedimentary rocks exposed in the lower Coyote Creek area preserve a record of surface deformation, stream reorganization, and erosion that resulted from initiation and slip on the Coyote Badlands strand of the Coyote Creek fault. A well-exposed section of conglomerate and san...

We present an efficient numerical method for earthquake cycle simulations that employs a finite difference discretization of the off-fault material to accommodate spatially variable elastic properties. The method is developed for the two-dimensional antiplane shear problem of a vertical strike-slip fault with rate-and-state friction. We compare earthquake cycles in a homogeneous half-space with...