April 7, 2011 Earthquake: Near E Coast Honshu, Japan

Felt Reports

Two people killed, 132 injured and several roads damaged

in the Ishinomaki-Onagawa area. One person died in

Yamagata when a power outage interrupted oxygen supply. Felt (VII) at Sendai, (V) at Misawa and (IV) in the Tokyo-Yokohama area. Felt (V) at Sapporo, Hokkaido. Felt widely in central and northern Honshu and in southern Hokkaido. Recorded (6U JMA) in Miyagi.

BTectonic Summary

The April 7, 2011 earthquake near the east coast of Honshu, Japan occurred as a result of thrust/reverse faulting on or near the subduction zone plate boundary between the Pacific and North America plates. At the latitude of this earthquake, the Pacific plate moves approximately westwards with respect to the North America plate at a rate of 83 mm/yr, and begins its westward descent beneath Japan at the Japan Trench. Note that some authors divide this region into several microplates that together define the relative motions between the larger Pacific, North America and Eurasia plates; these include the Okhotsk and Amur microplates that are respectively part of North America and Eurasia.

The epicenter and focal-depth of the April 7 earthquake are consistent with the event having occurred very close to the main interface thrust-fault of the subduction zone plate boundary. Preliminary focal-mechanisms, however, imply slip on a fault with steeper dip than that of the main interface thrust-fault, which may imply an intraplate source is more likely.

This earthquake can be considered an aftershock of the March 11, 2011 Mw 9.0 Tohoku earthquake. The aftershock sequence of that event has been ongoing since March 11, and has included 58 earthquakes of M 6 or greater up until April 7 2011, two of which were greater than M 7 (M7.7 and M7.9, both on March 11). Over the two days preceding the March 11 earthquake, a series of large foreshocks had occurred, beginning on March 9th with a M 7.2 event approximately 40 km from the epicenter of the March 11 earthquake, and continuing with another three earthquakes greater than M 6 on the same day. Prior to March 9 2011, the Japan Trench subduction zone had hosted nine events of magnitude 7 or greater since 1973. See the tectonic summary of the March 11 event for more details of the historic seismicity in this region.

(above from reference #1053)

Three killed, 93 injured in Japan's 7.1 aftershock, Herald Sun, April 8, 2011.--A Powerful aftershock rocked Japan's tsunami disaster zone, killing at least three and triggering new concerns over nuclear power plants in a region still grappling with an atomic emergency. Electricity was cut across a huge area of northern Japan, forcing cooling systems at three nuclear plants to switch to emergency power and plunging more than 3.3 million households into darkness late yesterday night. At least one back-up supply remained online at all three plants, but the aftershock highlighted the potential risks of nuclear generation in an earthquake zone amid a battle to stabilise reactors at tsunami-hit Fukushima. The Fire and Disaster Management Agency said a 63-year-old woman in Yamagata prefecture died after her home respirator failed when the power was knocked out. The agency said one person also died in Miyagi prefecture - the area worst hit by the 9.0 magnitude quake of March 11 and the towering tsunami it spawned. It said at least 93 people were confirmed injured as of Friday morning. Jiji Press put the number at around 130. (reference #9336)