The earthquake was followed by a dozen aftershocks, with at least one with a magnitude of 4.2.
CALIFORNIA, USA — The United States Geographical Survey says a magnitude 6 earthquake rattled parts of Northern California after hitting near the California-Nevada border southeast of Markleeville. Its epicenter was centered just miles from Walker, California. It was followed by dozens of aftershocks, including nearly a half-dozen of magnitude 4.0 or greater.
According to USGS, the quake happened as a result of normal faulting in the shallow crust of the North America plate. Authorities said the slip likely happened on a moderately dipping fault hitting roughly north-south.
As of 8 p.m., the USGS had recorded 61 tremors all around the area of the original quake.
"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 …