The second event was a M5.8 shock that occurred off the coast of Oceanside on July 13. This main shock was followed by an extensive aftershock sequence, with 55 events of M L ≧ 3.0 during July 1986. The abundance of aftershocks may be related to the large temporal variation in stress orientation that, in turn, may have resulted from the small stress drop of the main shock. The first of these shocks came on July 8 with a M6.0 event on the Banning fault near Palm Springs and the second event occurred off the coast of Oceanside as a M5.8 shock on July 13. The epicenter of the July 8 earthquake was located in this convoluted area of faults between two segments of the Banning Fault and the Mission Creek strand of the San Andreas Fault, about 16 miles (25 km) northwest of where these two faults converge to form the Coachella Valley segment of the SAF. The 1986 Chalfant Valley earthquake struck southern Mono County near Bishop and Chalfant, California at 07:42:28 Pacific Daylight Time on July 21. Each had mild to moderate effects and began on July 8 with the event near The San Andreas Fault (SAF) spans nearly the length of California, where much of its length the fault is clearly identifiable, especially from San Francisco to near Early research indicated that the Banning Fault comprises three segments and that the nearly-parallel Garnet Hill Fault lies just to the south. While the earthquake off the southern California coast … However, because of the abundance of large (ML -> 3.0) aftershocks following this earthquake, analysis … Some of the aftershocks that are located to the southeast of the main shock and have strike-slip focal mechanisms suggest activation of the northwest-trending San Diego Trough fault. In Whitewater Canyon, chimneys fell and three homes were destroyed, and ceramic columns were broken and a The shock was captured by strong motion stations that were operated by the An earthquake of M_L = 5.3 occurred at 32°58.7′N, 117°51.5′W southwest of Oceanside in San Diego County at 13:47 13 July 1986 (UT). The epicenters of the main shock and aftershocks are located at the northern end of the San Diego Trough-Bahia Soledad fault zone (SDT-BS) where it changes strike from northwest to a more westerly direction through a left offset or a bend in the fault.

The first of these shocks came on As no large earthquake has occurred between the southern extent of the 1932 In Bishop, windows were shattered and ceiling tiles fell in several buildings, and a portion of the brick Many of the mobile homes were able to be remounted on their foundations, but 18–20 of the homes were unable to be repaired. The results of the stress inversion, and the focal mechanisms that showed reverse faulting, suggest that the Inner Continental Borderland offshore from Oceanside is not currently a pure-strike-slip tectonic regime but rather a strike-slip mixed with reverse faulting regime. At least twenty-nine injuries and one death are attributed to the 1986 Oceanside earthquake, the epicenter of which was located offshore, beneath the Pacific Ocean. With a moment magnitude of 6.2 and a maximum Mercalli intensity of VI (Strong), the shock injured two people and caused property damage estimated at $2.7 million in the affected areas.There was a significant foreshock and … The 1986 Oceanside earthquake sequence is located 50 to 60 km to the southwest offshore from Oceanside in San Diego county (Figure I). All the details of the earthquake that occurred, Earthquake 40.86km (25.39 miles) away from Oceanside (United States of America) The shock occurred in a complex setting along the San Andreas Fault Zone where it bisects San Gorgonio Mountain and San Jacinto Peak at the San Gorgonio Pass and was the first in a series of three earthquakes that affected southern California and the northern Owens Valley in July 1986. July 1986 was an unusually active month for moderate to strong earthquakes in California, with three events occurring in less than two weeks, each with mild to moderate effects.

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