Map: The 6.0 earthquake south of Tahoe and its many aftershocks

In the four hours after Thursday’s magnitude 6 earthquake near Mono County, two dozen aftershocks of 3 and greater were recorded, the U.S. Geological Survey said.

(Zoom in to the map above to see the location and magnitudes of the aftershocks.)

The first quake struck at 3:49 p.m. just west of Walker, a small town on Highway 395 about 50 miles south of Carson City, Nevada.

Among the aftershocks were six ranging from 4.0 to 4.6, the USGS said.

The 6.0 was the largest quake centered in California since the 7.1 Ridgecrest quake on July 5, 2019. The almost 25,000 responses Thursday to the USGS Did You Feel It website spanned from Redding to Delano and from Fallon, Nevada, to the Pacific coast.

The agency said that, in the past 100 years, only two larger quakes have been recorded within 40 miles of Thursday’s epicenter. Both measured 6.1 — one on Sept. 12, 1994, that caused minor damage to the Markleeville courthouse, and one on June 25, 1933, in the hills near Carson City.