The November 4, 1927 earthquake
M6.9Lompoc, California
A magnitude 6.9 earthquake 6.2 miles deep, 6.2 miles off Santa Barbara County. The 10th strongest in California’s record since 1900, and the strongest within 50 miles in the catalogue, which runs from 1900.
The earthquake
- Magnitude
- 6.9
- moment magnitude (mw)
- Depth
- 6.2 mi
- 10.0 km below the surface
- Local time
- Friday, November 4, 1927
- 05:51 PST; 13:51 UTC
- In California’s record
- 10th
- strongest of 97,065 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event iscgem909604 (“The 1927 Lompoc, California Earthquake”). The USGS event page carries the ShakeMap, felt reports and the official summary.
Counties and cities within 50 miles
Distance from the epicentre to each county boundary (zero when inside) and to each city centre.
Counties
- Santa Barbara CountyCA · 6.2 mi
- San Luis Obispo CountyCA · 19.7 mi
Cities, largest first
- Santa MariaCA · 22.9 mi
- San Luis ObispoCA · 40.6 mi
- LompocCA · 13.4 mi
- Arroyo GrandeCA · 31.4 mi
- Grover BeachCA · 30.8 mi
- Morro BayCA · 48.3 mi
Earthquakes around the epicentre
153 earthquakes of magnitude 3 or more within 50 miles of this epicentre since 1973.
Earlier earthquakes of magnitude 5 or more within 50 miles, strongest first
- July 27, 1902M5.8
- July 31, 1902M5.8
- January 11, 1915M5.7
USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.