LOS ANGELES: Earthquake measuring 4.7 on the Richter scale struck deep beneath a mountain range in Southern California on Monday, jangling the nerves of tennis stars competing in the nearby desert town of Indian Wells and rattling urban areas as far away as Los Angeles, but no damage or injuries were reported.

Automated sensors initially reported the quake as a flurry of three tremors in rapid succession at magnitudes of 5.1 or higher, but seismic strength was quickly downgraded to between 4.6 and 4.7 before scientists determined that only a single quake of that size had actually occurred.
Susan Hough, a seismologist for the US Geological Survey in Pasadena, said the agency's real-time quake-reporting system was "confused" by a 2.3 magnitude foreshock that preceded the main jolt by 16 seconds, and a 3.2 aftershock less than a minute later.
The main quake, which hit shortly before 10 am local time about 22 miles (35 km) south of the resort town of Palm Springs, ended up being followed by about 100 very small aftershocks, she said.
The principal tremor occurred about 6 to 8 miles (12 to 14 km) beneath the San Jacinto Mountains, a granite range towering over California's southern desert, on a branch of an active fault line named for the mountain, Hough said.


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