![]() Subsequent aftershocks extended approximately 50 km (~30 miles) along the Little Lake Fault Zone. The latter, now considered the mainshock, was the most powerful earthquake to occur in the state in 20 years (after the 1999 Hector Mine earthquake). PDT approximately 10 km (6 miles) to the northwest. The M 5.4 and M 7.1 quakes struck on Friday, July 5 at 4:08 a.m. This quake was preceded by several smaller earthquakes, and was followed by more than 1,400 detected aftershocks. PDT, approximately 18 km (11.2 mi) ENE of Ridgecrest, and 13 km (8.1 mi) WSW of Trona, on a previously unnoticed NE-SW trending fault where it intersects the NW-SE trending Little Lake Fault Zone. The first main shock (now deemed to be a foreshock) occurred on Thursday, July 4 at 10:33 a.m. Eleven months later, a M w 5.5 aftershock took place (the largest aftershock of the sequence) to the east of Ridgecrest. ![]() They included three initial main shocks of M w magnitudes 6.4, 5.4, and 7.1, and many perceptible aftershocks, mainly within the area of the Naval Air Weapons Station China Lake. The 2019 Ridgecrest earthquakes (more commonly referred to in scientific literature as the 2019 Ridgecrest earthquake sequence) of July 4 and 5 occurred north and northeast of the town of Ridgecrest, California located in Kern County and west of Searles Valley (approximately 200 km north-northeast of Los Angeles).
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