A magnitude 4.7 earthquake 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.