User:Dawnseeker2000/Sandbox 7

The 1986 Oceanside earthquake occurred on the southern coast of California on July 13 at 05:47:09 local time with a moment magnitude of 5.8 and a maximum Mercalli intensity of VI (Strong).

Preface
July 1986 was an unusually active month for moderate to strong earthquakes in California, with three events occurring in less than two weeks. Each had mild to moderate effects and began on July 8 with the North Palm Springs earthquake, which occurred on a portion of the southern San Andreas Fault system that has been designated a seismic gap and is a likely location for a very large future earthquake. The second event was the M5.8 shock that occurred off the coast of Oceanside on July 13, which occurred in an area thought to be capable of generating a tsunami. The Chalfant Valley earthquake occurred on July 21 along the White Mountains Fault Zone near Bishop.

Tectonic setting
The strike-slip San Andreas system of faults terminates in the north at the Mendocino Triple Junction and in the south at the Salton Sea where displacement transitions to a series of spreading centers and transform faults, beginning with the Brawley Seismic Zone in the Imperial Valley. The diffuse plate boundary extends east into the Basin and Range Province of eastern California and western Nevada (a seismically active area called Walker Lane) and southwest into the California Continental Borderland region off the central and southern coasts.

Intensity
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Effects
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Aftermath
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