\nThe November 17, 2002, M 7.3 earthquake northwest of the Kuril Islands occurred as the result of deep reverse faulting approximately 459 km beneath the Sea of Okhotsk. Focal mechanism solutions indicate that rupture occurred on either a near-vertical reverse fault or a very shallowly dipping thrust fault. Slip on a fault of either orientation would accommodate the down-dip compression of the Pacific slab that is implied by the reverse component of the faulting solution. At the location of the earthquake, the Pacific plate subducts to the west beneath the North America plate at a velocity of about 80 mm/yr, beginning its descent into the mantle at the Kuril-Kamchatka Trench, several hundred kilometers southeast of the November 17th event. This convergence results in the volcanic Kuril Island Arc parallel to the plate boundary trench. \n
\n\nSubduction zones produce numerous earthquakes from multiple sources. Shallow earthquakes occur within the crust of the overriding plate between the trench and the volcanic arc at the interface between the plates. Deeper earthquakes occur mostly within the subducting plate. Given this earthquake’s faulting mechanism and depth, it likely resulted from internal deformation of the Pacific plate as it descends into the mantle.\n
\n\nEarthquakes 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 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 prior to this November 2002 earthquake was a M 8.2 event that occurred at a depth of 630 km within the subducted Nazca plate beneath South America near the northern Bolivian border in 1994. A larger event has since occurred—namely the M 8.3 earthquake that occurred at a depth of 600 km within the subducted Pacific plate beneath the Sea of Okhotsk offshore of northeastern Russia in 2013. The M 8.3 Sea of Okhotsk earthquake was felt all over Asia, as far away as Moscow, and across the Pacific Ocean along the western seaboard of the United States (though at distant locations, individuals reporting having felt the event were likely very favorably situated for the perception of small ground motions). The M 8.2 Bolivian deep-focus earthquake in 1994 had similarly been reported by individuals in North America at great distance from the epicenter.\n
\n\nOver the past century, 69 earthquakes with a magnitude of M 7+ have occurred at depths greater than 300 km globally; 4 of these were located in the same region as the November 17, 2002, event. The largest was a M 7.3 earthquake in August 1970, several hundred kilometers to the northeast and 188 km deeper than the November 17th event.\n
\n\nWithin this tectonically diverse region, several other large earthquakes have occurred within the last 40 years. Five other earthquakes of at least M 7 have occurred within 400 km of the November 17th event. The events range in focal depth from shallow to deep as well as in focal mechanism solution, which is further evidence for the multiple faulting styles typical of subduction zones.\n
\n\nHayes et al. (2016) Tectonic summaries of magnitude 7 and greater earthquakes from 2000 to 2015, USGS Open-File Report 2016-1192. (5.2 MB PDF)\n
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