Magnitude 5.9 - OFFSHORE NORTHERN CALIFORNIA
2010 February 04 20:20:21 UTC
- This event has been reviewed by a seismologist.
|Depth||23.6 km (14.7 miles)|
|Region||OFFSHORE NORTHERN CALIFORNIA|
|Distances||70 km (45 miles) WSW of Fortuna, California|
80 km (50 miles) WSW of Eureka, California
145 km (90 miles) NW of Fort Bragg, California
360 km (225 miles) NW of SACRAMENTO, California
|Location Uncertainty||horizontal +/- 1.4 km (0.9 miles); depth +/- 7.4 km (4.6 miles)|
|Parameters||Nph= 41, Dmin=53 km, Rmss=0.19 sec, Gp=234°,|
M-type=regional moment magnitude (Mw), Version=H
- Did you feel it? Report shaking and damage at your location. You can also view a map displaying accumulated data from your report and others.
The earthquake's epicenter is west of the Mendocino Triple Junction, which is formed by the intersection of the Mendocino fracture zone, the San Andreas fault and the Cascadia subduction zone.
Preliminary analysis of the earthquake indicates that it results from slip on a near vertical strike-slip fault. There are no reports of this earthquake causing a tsunami. Strike-slip earthquakes are less likely to produce large tsunamis because they cause relatively little vertical ground displacement.
This earthquake occurred 30 km southwest of the magnitude 6.5 earthquake of January 10, 2010. Other significant earthquakes in this region include the April 25, 1992 M7.2 Cape Mendocino and the June 15, 2005 M7.2 Gorda plate earthquakes.
Scientific & Technical Information
- USGS Centroid Moment Tensor Solution
- USGS Body-Wave Moment Tensor Solution
- Global CMT Project Moment Tensor Solution
- USGS WPhase Moment Tensor Solution
- NCSS Moment Tensor Solution
- Historic Moment Tensor Solutions
- Theoretical P-Wave Travel Times
- Waveforms for ShakeMap
- NCSS First Motion Mechanism 1