The April 29, 2008 earthquake
M5.4near Burnt Ranch, California
A magnitude 5.4 earthquake 17.2 miles deep, centred in Trinity County. The 229th strongest in California’s record since 1900, and the strongest within 50 miles since a magnitude 5.4 on December 26, 1994. 1 aftershock of magnitude 2.5 or more followed within 30 days.
The earthquake
- Magnitude
- 5.4
- moment magnitude (mw)
- Depth
- 17.2 mi
- 27.8 km below the surface
- Local time
- Tuesday, April 29, 2008
- 20:03 PDT; 03:03 UTC on Apr 30, 2008
- In California’s record
- 229th
- strongest of 97,065 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event nc40216664 (“3 km NNW of Burnt Ranch, California”). 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
Aftershocks in 30 days
2.8
Largest aftershock, May 14, 2008
0
On the first day
0
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
- Trinity CountyCA · inside
- Humboldt CountyCA · 3.5 mi
- Siskiyou CountyCA · 21.3 mi
- Del Norte CountyCA · 38.7 mi
- Shasta CountyCA · 38.9 mi
- Tehama CountyCA · 44.2 mi
Earthquakes around the epicentre
526 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
- November 8, 1980M7.2
- June 6, 1932M6.5
- December 21, 1954M6.4
- October 28, 1909M6.0
- August 18, 1908M5.8
- August 20, 1927M5.6
- December 26, 1994M5.4
- June 7, 1975M5.3
- February 3, 1979M5.2
- February 9, 1923M5.0
USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.