Historic Earthquakes

Santa Cruz Mountains (Loma Prieta), California
1989 10 18 00:04:15 UTC (Local 1989 10 17 05:04:15 p.m. PDT)
Magnitude 6.9
Intensity IX

Isoseismal Map

Isoseismals are based on intensity estimates from data.

Isoseismal Map

Abridged from Seismicity of the United States, 1568-1989 (Revised), by Carl W. Stover and Jerry L. Coffman, U.S. Geological Survey Professional Paper 1527, United States Government Printing Office, Washington: 1993.