Magnitude 7.7 - SEA OF OKHOTSK
2008 July 05 02:12:04 UTC
- This event has been reviewed by a seismologist.
|Depth||635.6 km (395.0 miles)|
|Region||SEA OF OKHOTSK|
|Distances||395 km (245 miles) WNW of Petropavlovsk-Kamchatskiy, Russia|
420 km (260 miles) NNW of Severo-Kuril'sk, Kuril Islands, Russia
2265 km (1410 miles) NNE of TOKYO, Japan
6510 km (4040 miles) NE of MOSCOW, Russia
|Location Uncertainty||horizontal +/- 3.1 km (1.9 miles); depth +/- 5.3 km (3.3 miles)|
|Parameters||NST=551, Nph=551, Dmin=332.3 km, Rmss=0.83 sec, Gp= 14°,|
M-type=centroid moment magnitude (Mw), Version=S
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The following is a release by the United States Geological Survey, National Earthquake Information Center: An earthquake occurred 385 km (240 miles) WNW of Petropavlovsk-Kamchatskiy, Russia or 415 km (260 miles) NNW of Severo-Kuril'sk, Kuril Islands, Russia or 2280 km (1410 miles) NNE of TOKYO, Japan at 8:12 PM MDT, Jul 4, 2008 (Jul 05 at 1:12 PM local time in Russia). The magnitude and location may be revised when additional data and further analysis results are available. This earthquake is located in a remote area and no damage or casualties are expected.
WP 7.5 (GS).
The Sea of Okhotsk earthquake of 5 July 2008 occurred in the inclined seismic zone that dips to the west-northwest beneath Kamchatka and the Kurile Islands. In the region of Kamchatka, the Pacific plate moves to the west-northwest with respect to the Okhotsk plate with a velocity of about 80 mm/y. The Pacific plate thrusts under the Okhotsk plate at the Kuril-Kamchatka trench and is subducted into the mantle. The earthquake occurred within the Pacific plate, in response to stresses generated by the plate’s slow distortion, rather on the thrust fault that constitutes the interface the between the Okhotsk and Pacific plates and which is seismically active near the earth’s surface. The Pacific plate is active to depths of about 650 km in the region of the earthquake. Earthquakes that have focal-depths greater than 300 km are commonly termed “deep-focus” earthquakes. Deep-focus earthquakes cause less damage on the ground surface above their foci than is the case with similar magnitude shallow-focus earthquakes, but large deep-focus earthquakes may be felt at great distance from their epicenters. The largest recorded deep-focus earthquake had a magnitude of 8.2.
Scientific & Technical Information
The earthquake locations and magnitudes cited in NOAA tsunami statements and bulletins are preliminary and are superseded by USGS locations and magnitudes computed using more extensive data sets.
General Tsunami Information
- Preliminary Earthquake Report
- U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver