M 5.5 - The 1990 Upland, California Earthquake
- 1990-02-28 23:43:36 (UTC)
- 34.144°N 117.697°W
- 3.3 km depth
Focal Mechanism
- The data below are the most preferred data available
- The data below have been reviewed by a scientist
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Earthquake Hazards Program
- In cooperation with:
- CI