The June 28, 1992 earthquake
M5.5near Yucca Valley, CA
A magnitude 5.5 earthquake 4.7 miles deep, centred in San Bernardino County. The 206th strongest in California’s record since 1900, and the strongest within 50 miles since a magnitude 5.7 on June 28, 1992. 1,321 aftershocks of magnitude 2.5 or more followed within 30 days.
Watch the sequence unfoldMagnitude 5.5 · June 28, 1992
How the ground moved
Every recorded earthquake in the sequence, in order, from the foreshocks to a month after.
The earthquake
- Magnitude
- 5.5
- local magnitude (ml)
- Depth
- 4.7 mi
- 7.5 km below the surface
- Local time
- Sunday, June 28, 1992
- 05:36 PDT; 12:36 UTC
- In California’s record
- 206th
- strongest of 97,065 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event ci2056979 (“0km E of Yucca Valley, CA”). The USGS event page carries the ShakeMap, felt reports and the official summary.
Aftershocks
Earthquakes of magnitude 2.5 or more within 20 miles of the epicentre in the 30 days after.
1,321
Aftershocks in 30 days
5.7
Largest aftershock, Jun 29, 1992 · its page
255
On the first day
22
In the 7 days before
- The search radius is the surface rupture length expected for an earthquake of this magnitude (Wells and Coppersmith, 1994), at least 20 and at most 600 miles, so a great earthquake's sequence is counted along its whole fault.
Counties and cities within 50 miles
Distance from the epicentre to each county boundary (zero when inside) and to each city centre.
Counties
- San Bernardino CountyCA · inside
- Riverside CountyCA · 29.3 mi
Cities, largest first
- San BernardinoCA · 49.7 mi
- Moreno ValleyCA · 46.6 mi
- IndioCA · 28.6 mi
- HemetCA · 42.0 mi
- RedlandsCA · 42.8 mi
- BeaumontCA · 34.4 mi
- HighlandCA · 42.3 mi
- San JacintoCA · 39.3 mi
- YucaipaCA · 35.7 mi
- Palm DesertCA · 26.3 mi
- Cathedral CityCA · 19.4 mi
- CoachellaCA · 33.5 mi
Earthquakes around the epicentre
3,292 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
- June 28, 1992M7.3
- April 21, 1918M6.7
- July 22, 1923M6.2
- April 22, 1992M6.1
- July 8, 1986M6.0
- December 4, 1948M6.0
- June 28, 1992M5.8
- June 28, 1992M5.7
- May 2, 1949M5.7
- July 18, 1946M5.5
USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.