2021 Antelope Valley earthquake

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2021 Antelope Valley earthquake
2021 Antelope Valley earthquake is located in California
2021 Antelope Valley earthquake
2021 Antelope Valley earthquake is located in Nevada
2021 Antelope Valley earthquake
2021 Antelope Valley earthquake is located in the United States
2021 Antelope Valley earthquake
UTC time2021-07-08 22:49:48
ISC event620783812
USGS-ANSSComCat
Local date8 July 2021
Local time14:49:48
Magnitude6.0 Mw
Depth7.5 km (4.7 mi)
Epicenter38°30′29″N 119°30′00″W / 38.508°N 119.500°W / 38.508; -119.500Coordinates: 38°30′29″N 119°30′00″W / 38.508°N 119.500°W / 38.508; -119.500
Areas affectedCalifornia and Nevada, United States
Max. intensityVII (Very strong)
Aftershocks661 (As of 3 September 2021)[1]
CasualtiesNone

The 2021 Antelope Valley earthquake was a magnitude 6.0 earthquake that struck near the city of Coleville, California, located in the Antelope Valley, near the border with Nevada on July 8, 2021.[2] It was the largest earthquake to occur in California since the 2019 Ridgecrest earthquake almost exactly 2 years prior.

Impact[edit]

The earthquake triggered minor rockslides at the Kampgrounds of America campgrounds near Coleville and another along a stretch of US 395.[3] Though the earthquake epicenter was within California, the strongest shaking intensities (MMIs) were reported in the closest population centers of Carson City, Nevada, and Reno, Nevada. No deaths or serious injuries have been reported.

Geology[edit]

The epicenter occurred in a region known to produce moderate to large magnitude earthquakes from time to time. This region is commonly referred to as Walker Lane which is roughly bounded by the Sierra Nevada mountains to the west, the Garlock Fault to the south, the Basin and Range Province to the east, and the Oregon border to the north. Walker Lane is prone to produce large magnitude earthquake due to regional tectonics and the large number of active (both known and unknown) faults within this northwest–southeast trending trough. Most of the faults within Walker Lane are classified as strike-slip faults, however, faults closer to the edges of the trough are typically normal faults because of regional extension.

Earthquake[edit]

According to the United States Geological Survey, the earthquake may have been the result of rupture along the Slinkard Valley Fault.[4] The focal mechanism solution indicate normal faulting.[2]

Tectonic Summary[edit]

The Antelope Valley Earthquake occurred 32 km south-southwest of Smith-Valley, Nevada and occurred due to dip-slip faulting in the North American Plate. Shaking occurred along the east boundary of the Sierra Nevada, with the faulting occurring North to South along the boundary. This boundary is a small part of the larger Pacific-North America plate boundary system of the Western United States and makes up about 25% of the movement of the plate boundary per year.[5]

Aftershocks[edit]

As of 3 September 2021, there have been at least 661 aftershocks,[1] the strongest of which measured a magnitude of 5.0.

See also[edit]

References[edit]

  1. ^ a b "USGS earthquake catalog". United States Geological Survey.
  2. ^ a b "M 6.0 - Antelope Valley, CA". earthquake.usgs.gov. Retrieved July 8, 2021.
  3. ^ Amanda del Castillo; Paige McIntyre (July 9, 2021). "CA quake: Hundreds of small earthquakes reported following 6.0 near California-Nevada border". San Francisco, CA. ABC7News. Retrieved July 9, 2021.
  4. ^ "USGS Earthquakes". Twitter. Retrieved July 10, 2021.
  5. ^ "2021 Antelop Valley Earthquake". earthquake.usgs.gov. Retrieved October 6, 2021.

External links[edit]

The International Seismological Centre has a bibliography and/or authoritative data for this event.