  Barstow Los Angeles Las Vegas Carson City  | |
| UTC time | 1999-10-16 09:46:45 |
|---|---|
| ISC event | 1643776 |
| USGS-ANSS | ComCat |
| Local date | October 16, 1999 |
| Local time | 02:46:45 PDT[1] |
| Magnitude | 7.1 Mw[1] |
| Depth | 20 km (12 mi)[1] |
| Epicenter | 34°32′N 116°23′W / 34.54°N 116.39°W[1] |
| Type | Strike-slip[2] |
| Areas affected | Southern California United States |
| Total damage | Limited[3] |
| Max. intensity | MMI VII (Very strong)[2] |
| Casualties | 4–5 injured[2][4] |
The 1999 Hector Mine earthquake occurred in Southern California, United States, on October 16 at 02:46:50 PDT. Its moment magnitude was 7.1 and the earthquake was preceded by 12 foreshocks, the largest of which had a magnitude of 3.8. The event is thought to have been triggered by the 1992 Landers earthquake which occurred seven years earlier. It also deformed nearby faults vertically and horizontally. The earthquake's hypocenter was at a depth of 20 kilometers and its epicenter at 34.603° N 116.265° W.[5]
The earthquake caused minimal damage and no fatalities due to the distance of its epicenter from populated centers. The significance of this earthquake lies in the fact that, firstly, it had a relatively-high magnitude but caused little damage and secondly, it offered more evidence that stress accumulation over time causes earthquakes.
- ^ a b c d Cite error: The named reference
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NGDCwas invoked but never defined (see the help page). - ^ Cite error: The named reference
Byerswas invoked but never defined (see the help page). - ^ "M 7.1 – Hector Mine, CA Earthquake". United States Geological Survey. Retrieved 2021-11-30.