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The July 2019 Ridgecrest earthquakes consist of three main shocks of magnitudes 6.4, 5.4, and 7.1, each followed by a flurry of aftershocks of substantially lower magnitude. The aftershocks of the Ridgecrest earthquakes reveal two fault zones. The July 4 M 6.4 event (orange dot) occurred on the SW-NE fault where it intersects the NW-SE oriented ...
A summary of the work and findings (Ponti et al., 2020 and DuRoss et al., 2020) is: >6,000 total ground observations and >1,100 field displacement observations from the 2019 M6.4 and M7.1 Ridgecrest earthquake sequence, the M6.4 earthquake had a mean left-lateral slip of 0.3–0.5m (1.0–1.6ft), and the M7.1 earthquake had a mean right-lateral ...
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Jul 23, 2019 · July 23, 2019 12 PM PT. More than 80,000 earthquakes have been recorded in the Ridgecrest area since July 4 — the aftermath from two of the biggest temblors to hit California in nearly a decade ...
- ron.lin@latimes.com
- Staff Writer
Jul 1, 2020 · The largest earthquakes of the 2019 Ridgecrest, California, sequence were a M 6.4 left‐lateral rupture followed 34 hr later by a M 7.1 on a perpendicular right‐lateral fault. We use dynamic rupture modeling to address the questions of why the first earthquake did not propagate through the right‐lateral fault in one larger event, whether ...
May 10, 2021 · Over the past 40 years, 8 other M5+ earthquakes have occurred within 50 km of the July 4th, 2019 earthquake. The largest of these was an M5.8 event on September 20, 1995, about 13km (8mi) to the west-northwest of the Ridgecrest sequence, which was felt strongly in the China Lake-Ridgecrest area, and more broadly from Los Angeles to Las Vegas.
Dec 4, 2020 · The 2019 Ridgecrest, California, Earthquake Sequence. December 4, 2020. View Web Tool. This USGS geonarrative (Esri Story Map) summarizes the USGS response and findings after the M6.4 on July 4 and M7.1 on July 6, 2019 in Searles Valley, Southern California, and includes links to USGS research publications and data releases.
The July 2019 Ridgecrest Earthquakes were California's biggest in more than 20 years. On Thursday, July 4th, at 10:33 a.m. PST a magnitude 6.4 earthquake struck about 12 kilometers (10.5 miles) southwest of Searles Valley. Multiple aftershocks followed, and on Friday, July 5th, another earthquake struck with a magnitude of 7.1.
