Posted: 12:02 am ET
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USGC reported the April 14 and 15 earthquakes that hit the island of Kyushu:
The April 15, 2016 M 7.0 earthquake north of Kumamoto, on the island of Kyushu in southwest Japan, occurred as the result of strike-slip faulting at shallow depth. Focal mechanisms for the earthquake indicate slip occurred on either a left-lateral fault striking to the northwest, or on a right-lateral fault striking northeast. While the earthquake occurred several hundred kilometers northwest of the Ryukyu Trench, where the Philippine Sea plate begins its northwestward subduction beneath Japan and the Eurasia plate, the shallow depth and faulting mechanism of this earthquake indicate it occurred on a crustal fault within the upper Eurasia plate. At the location of this event, the Philippine Sea plate converges with Eurasia towards the northwest at a velocity of 58 mm/yr.
The April 15, 2016, M 7.0 event (UTC 16:25:06) occurred one day after a series of foreshocks in the same region, which included M 6.2 and M 6.0 earthquakes. The April 14 events resulted in at least 9 fatalities and over 800 injuries.
According to the US Consulate in Fukuoka which covers the consular district, the Kyushu/Yamaguchi Region of southwestern Japan consists of seven prefectures on Kyushu Island (Fukuoka, Oita, Saga, Nagasaki, Kumamoto, Miyazaki, Kagoshima) and Yamaguchi prefecture on the southern tip of Honshu, with a combined population of over 15 million. The region’s $435 billion economy constitutes Japan’s fourth largest economic center, representing about 10 percent of national GDP – comparable in size to the Netherlands.
The US Embassy in Tokyo issued one Emergency Message to U.S. citizens saying in part that “Kumamoto is approximately 730 miles southwest of Tokyo. Authorities report nine confirmed deaths and as many as 1,000 injured. Local authorities report no U.S. citizens among the casualties. No tsunami warning was issued. The Japan Meteorological Agency reported several aftershocks, some of which exceeded 5.0 magnitude. Aftershocks may continue for up to a week. Heavy rains are expected in the region over the coming weekend, which may lead to landslides.”
U.S. Forces Japan announced that the Marines with the 31st Marine Expeditionary Unit arrived on Marine Corps Air Station Iwakuni, Japan, over the weekend to assist with recovery efforts in support of the Government of Japan’s relief efforts. According to the DOD release, the U.S. military support is provided at the request of the Government of Japan and is in support of efforts undertaken by the Japanese Self Defense Force.
Japan Times reported that a cabinet secretary said there [are] no abnormalities at nearby nuclear facilities. The epicenter was 120 km (74 miles) northeast of Kyushu Electric Power Co.’s Sendai nuclear plant in Kagoshima Prefecture, the only one operating in the country. The Asahi Shimbun quotes Chief Cabinet Secretary Yoshihide Suga saying, “Under the current circumstances, there is no need to stop the plant because (the shaking) is sufficiently low.”
Meanwhile, in Fukuoka, motorists and pedestrians have reported seeing white foam on the streets after the quakes: