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The January 1, 1927 earthquake

M6.0near Progreso, Mexico, California

A magnitude 6.0 earthquake 6.2 miles deep, 35.7 miles off San Diego County. The 83rd strongest in California’s record since 1900, and the strongest within 50 miles since a magnitude 6.6 on November 20, 1915.

The earthquake

Magnitude
6.0
moment magnitude (mw)
Depth
6.2 mi
10.0 km below the surface
Local time
Saturday, January 1, 1927
00:16 PST; 08:16 UTC
Epicentre
32.41°N, 115.55°W
35.7 mi from San Diego County
In California’s record
83rd
strongest of 97,065 since 1900
Within 50 miles
3
counties; more on this date

USGS ANSS Comprehensive Earthquake Catalog, event iscgem909037 (“19 km S of Progreso, Mexico”). 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

Cities, largest first

Earthquakes around the epicentre

3,961 earthquakes of magnitude 3 or more within 50 miles of this epicentre since 1973.

Earthquakes of magnitude 3 or more within 50 miles of the epicentre, by year 1973: 29 1974: 26 1975: 74 1976: 93 1977: 55 1978: 47 1979: 282 1980: 52 1981: 35 1982: 15 1983: 26 1984: 37 1985: 19 1986: 43 1987: 222 1988: 57 1989: 45 1990: 21 1991: 28 1992: 20 1993: 52 1994: 17 1995: 11 1996: 10 1997: 27 1998: 29 1999: 61 2000: 55 2001: 20 2002: 89 2003: 23 2004: 28 2005: 32 2006: 80 2007: 35 2008: 120 2009: 89 2010: 1,345 1,345 2011: 100 2012: 118 2013: 43 2014: 18 2015: 21 2016: 29 2017: 18 2018: 21 2019: 15 2020: 84 2021: 29 2022: 17 2023: 27 2024: 57 2025: 15 19731978198319881993199820032008201320182023

Earlier earthquakes of magnitude 5 or more within 50 miles, strongest first

USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.