Magnitude 7.7 - SEA OF OKHOTSK

2008 July 05 02:12:04 UTC

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Earthquake Details

Magnitude7.7
Date-Time
Location53.888°N, 152.869°E
Depth635.6 km (395.0 miles)
RegionSEA OF OKHOTSK
Distances395 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 Uncertaintyhorizontal +/- 3.1 km (1.9 miles); depth +/- 5.3 km (3.3 miles)
ParametersNST=551, Nph=551, Dmin=332.3 km, Rmss=0.83 sec, Gp= 14°,
M-type=centroid moment magnitude (Mw), Version=S
Source
  • USGS NEIC (WDCS-D)
Event IDus2008ucaf
  • This event has been reviewed by a seismologist.
  • 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.

Earthquake Summary

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Earthquake Summary Poster

  • 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.

    • Felt Reports

    WP 7.5 (GS).

    Tectonic Summary

    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.

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