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Earthquake Summary Poster

Poster of the Kuril Islands Earthquakes of 15 November 2006 and 13 January 2007

Kuril Islands Earthquakes

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DISCUSSION

The M 8.3 Kuril Islands earthquake of 15 November 2006 occurred as shallow thrust-faulting on the boundary between the Pacific plate and the Okhotsk plate. The M 8.1 earthquake on 13 January 2006 occurred as steep normal-faulting approximately 95 km ESE of the November earthquake within the outer-rise portion of the Pacific plate. In the region of these earthquake epicenters, the Pacific plate moves northwest with respect to the Okhotsk plate with a velocity of about 90 mm/year. The Pacific plate subducts beneath the Okhotsk plate at the Kuril-Kamchatka Trench and becomes progressively deeper to the northwest, remaining seismically active to a depth of about 680 km.

The 15 November earthquake occurred with maximum slip under 900 cm on a rupture surface 400 km long and 138 km wide dipping about 15° to the northwest.

In contrast, the 13 January 2007 earthquake occurred with maximum slip over 2000 cm, on a rupture surface 200 km long and 35 km wide dipping about 60° to the southeast. This is much steeper, in the opposite direction, on a rupture surface about 10-15% the area of the November 2006 earthquake.