Global Information1986 Chalfant Valley earthquake information
  Fallon Sacramento Oceanside Las Vegas Santa Cruz Palm Springs Death Valley Coalinga  | |
| UTC time | 1986-07-21 14:42:28 |
|---|---|
| ISC event | 491308 |
| USGS-ANSS | ComCat |
| Local date | July 21, 1986 |
| Local time | 07:42:28 PDT |
| Magnitude | 6.2 Mw [1] |
| Depth | 10 km (6.2 mi) [1] |
| Epicenter | 37°32′N 118°25′W / 37.54°N 118.42°W [1] |
| Type | Strike-slip |
| Areas affected | Eastern California United States |
| Total damage | US$2.7 million [2] |
| Max. intensity | MMI VI (Strong)[2] |
| Peak acceleration | 0.46 g [3] |
| Foreshocks | 5.7 ML July 20 at 14:29 [3] |
| Casualties | 2 injured [2] |
The 1986 Chalfant Valley earthquake struck southern Mono County near Bishop and Chalfant, California at 07:42:28 Pacific Daylight Time on July 21. 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 aftershock sequence that included a few moderate events, and was the last in a series of three earthquakes that affected southern California and the northern Owens Valley in July 1986.
Strong motion stations at the Long Valley Dam and an instrumented building in Bishop captured light to moderate readings from the event. The faulting reached the surface of the ground, but the maximum amount of measurable slip was limited to about 11 centimeters (4.3 in) of strike-slip motion along the White Mountain Fault Zone. Other destructive and surface-rupturing earthquakes, as well as large volume volcanic eruptions, have occurred in the area. Although the series of shocks occurred within the White Mountain seismic gap, the region continues to have potential for a very large earthquake.
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