Event Time: 03:49 PM (PDT) Thursday July 08, 2021
Location: 38.5062 N -119.5397 W Depth: 0.09 (km) #Phs: 10
UTC – Event Time: 22:49 (189) Thursday July 08, 2021 (UTC)
20 km S of Topaz_Lake, NV
35 km SSE of Double_Springs_Flat, NV
39 km NW of Bridgeport, CA
If you felt the earthquake, please fill out this USGS survey
A series of aftershocks is ongoing in the area, with the largest one reported at magnitude 4.2 There are no damage reports at this time. We will update this story as it develops.
July 8, 2021 at 10:11 PM Another aftershock felt at YubaNet HQ – magnitude 4.4 located 27 km southwest of Smith Valley. 145 aftershocks so far since the 6.0 quake this afternoon.
July 8, 2021 at 6:28 PM Per USGS: The July 8, 2021 M 6.0 earthquake in Antelope Valley, California, 32 km south-southwest of Smith Valley, Nevada, occurred as the result of normal faulting in the shallow crust of the North America plate. Preliminary focal mechanism solutions for the event, which describe the style of faulting in an earthquake, indicate slip likely occurred on a moderately dipping fault striking roughly north-south. This motion is consistent with east-west oriented extension that is common in Nevada and eastern California. This earthquake occurred along the eastern edge of the Sierra Nevada, a major physiographic boundary along the California-Nevada border.
Tectonically, this event occurred at the margin of the stable Sierra Nevada microplate and the Walker Lane, a zone of distributed shear. The Sierra Nevada microplate moves at about 12 mm/yr to the northwest relative to the North American plate. The Sierra Nevada microplate is a part of the broader Pacific-North America plate boundary system of California, and roughly 25% of the 5 cm/yr total plate boundary motion occurs east of the Sierra Nevada. Earthquakes in the vicinity of the July 8 earthquake include both normal faulting earthquakes and strike-slip earthquakes.
In the past 100 years, 33 earthquakes of M5+ or larger have occurred within 100 km of the July 8 earthquake. The largest of these were a M6.1 earthquake 36 km to the northwest in September 1994 and a M6.1 earthquake 63 km to the north in June 1933.
July 8, 2021 at 6:03 PM USGS has upgraded the earthquake to a magnitude 6.0
July 8, 2021 at 5:09 PM By now, 35 aftershocks have registered. As mentioned by NV Seismo Labs, this is not unexpected.
July 8, 2021 at 4:58 PM Caltrans is detouring traffic on U.S. 395 to State Route 182 in Bridgeport. Maintenance Crews are working to remove the fallen rocks, but there is no ETO for 395 at this time.
July 8, 2021 at 4:40 PM Per Nevada Seismo lab:
A magnitude 5.9 earthquake occurred at 3:49 pm PDT this afternoon in Antelope Valley near the California/Nevada Border in the Walker Lane. The epicenter is between the towns of Coleville and Walker, California near the Antelope Valley fault system.
We are receiving many reports of felt shaking from this event up and down the Highway 395 corridor. We felt it here at NSL!
Submit your Did You Feel It reports here: https://t.co/WZl8J2ByV3
A magnitude 5.9 event will produce many aftershocks, and some will be large enough to be felt.
When you feel shaking: Drop, Cover, and Hold on.
July 8, 2021 at 4:34 PM Another earthquake felt here at YubaNet HQ – magnitude 4.9 per USGS
July 8, 2021 at 4:23 PM Aftershocks so far:
3.0 29km NE of Dardanelle, CA
2.0 9 km ENE of Coleville, California
2.6 33km ENE of Dardanelle, CA
2.5 17 km WSW of Coleville, California
3.5 32km SE of Markleeville, CA
3.6 28km ENE of Dardanelle, CA
2.9 30km ENE of Dardanelle, CA
1.8 19km ENE of Yosemite Valley, CA
3.5 31km ENE of Dardanelle, CA
3.7 30km SE of Markleeville, CA
4.2 32km SE of Markleeville, CA
3.0 3 km SW of Coleville, California
3.2 1 km NW of Walker, California
July 8, 2021 at 4:16 PM Per USGS, the reported quake in Stockton has been removed, it was shaking from the Sierra quake.
July 8, 2021 at 4:14 PM Per CalOES: While there are no preliminary reports of damage or injuries, this is a rapidly evolving situation & more details will emerge in the coming hours
We are working closely with local officials to ensure they have the resources and support to rapidly respond to these earthquakes