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1969 Santa Rosa earthquakes information


1969 Santa Rosa earthquakes
1969 Santa Rosa earthquakes is located in California
1969 Santa Rosa earthquakes
Santa Rosa
Santa Rosa
UTC timeDoublet earthquake:    
 1969-10-02 04:56
 1969-10-02 06:19
ISC event 
 803001
 803006
USGS-ANSSComCat
 ComCat
Local dateOctober 1, 1969
Magnitude5.6 and 5.7 Mw
Depth9.6 km and 10.4 km
Epicenter38°28′01″N 122°41′31″W / 38.467°N 122.692°W / 38.467; -122.692[1]
Areas affectedUnited States (Santa Rosa)
Max. intensityMMI VII (Very strong)
MMI VIII (Severe)
AftershocksYes
Casualties1 dead
Geological structures near Santa Rosa, showing the epicenters of the 1969 earthquakes

At 04:56 and 06:19 UTC on October 2, 1969 (21:56 and 23:19 PDT October 1), a pair of earthquakes of magnitude 5.6 and 5.7, respectively, struck the city of Santa Rosa, California, killing one person and damaging buildings. The maximum felt intensity for the two events was VII (Very strong) and VIII (Severe) respectively on the Mercalli intensity scale.[2] The $8.35 million cost of the earthquakes[3] went mostly to replace buildings damaged beyond repair. There were at least 200 aftershocks after the initial pair of earthquakes. At the time they were the largest earthquakes to affect the northern San Francisco Bay Area since the 1906 San Francisco earthquake.[4]

  1. ^ National Geophysical Data Center / World Data Service (NGDC/WDS): NCEI/WDS Global Significant Earthquake Database. NOAA National Centers for Environmental Information. "Significant Earthquake Information". doi:10.7289/V5TD9V7K. Retrieved 22 March 2024.
  2. ^ Bergen, K.J.; Fletcher J.B.; Boatwright J. & Langeheim V. (2007). "Site Response in the Northern San Francisco Bay Area, California" (PDF). USGS. Archived from the original (PDF) on 2012-03-05. Retrieved 5 September 2011.
  3. ^ USGS. "Santa Rosa, Sonoma County, California 1969 October 02 04:46 and 06:19 UTC (local October 1) Magnitude 5.6 and 5.7". Historic Earthquakes. USGS. Archived from the original on 2016-12-01. Retrieved 6 September 2011.
  4. ^ Cite error: The named reference Wong was invoked but never defined (see the help page).

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