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The earthquake was also felt by residents in Tokyo and across the Kanto Region [25] and as far as Aomori Prefecture in the northern tip of Honshu to Kyushu in the south of the country. [50] A peak ground acceleration of 2,826 gal was observed in Shika, which was close to that recorded during the 2011 Tohoku earthquake which measured 2,934 gal. [55]
The earthquake had a focal mechanism corresponding to reverse faulting. [10] A magnitude 5.6 aftershock struck the area at 21:58 JST, succeeded by another aftershock, at 23:18 JST of magnitude 4.5, along with over 50 other aftershocks hitting on Saturday, between magnitude 2 and 5.
A seismogram recorded in Massachusetts, United States. The magnitude 9.1 (M w) undersea megathrust earthquake occurred on 11 March 2011 at 14:46 JST (05:46 UTC) in the north-western Pacific Ocean at a relatively shallow depth of 32 km (20 mi), [9] [56] with its epicenter approximately 72 km (45 mi) east of the Oshika Peninsula of Tōhoku, Japan, lasting approximately six minutes.
Earthquakes occur where the Pacific plate meets the plate beneath northern Honshu in a subduction zone. [15] The Pacific plate, which moves at a rate of 8 to 9 cm (3.1 to 3.5 in) per year, dips under Honshu's underlying plate releasing large amounts of energy.
phys.org, New report illuminates stress change during the 2011 Tohoku-Oki earthquake, February 7, 2013; Physics Today, Scientists dig deep in Tohoku fault to crack earthquake's secrets, August 2013. Christian Science Monitor, How slippery clay helps Japan's 2011 mega tsunami, December 6, 2013.
Scientists recorded a slow-slip event in 2011 before the magnitude-9 Tohoku earthquake and tsunami in Japan, which killed more than 18,000 people and touched off the Fukushima nuclear disaster.
Taiwan and its surrounding waters have registered about 2,000 earthquakes with a magnitude of 4.0 or greater since 1980, and more than 100 earthquakes with a magnitude above 5.5, according to the ...
The basis for defining this tectonic boundary is the occurrence of large magnitude 7 or greater earthquakes along a linear zone from offshore Niigata Prefecture to off the west coast of Hokkaido. [7] Following the 1983 Nihonkai-Chubu earthquake , the idea of a young plate boundary was proposed, but its mechanism is unknown—it has been ...