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Mechanism of Earthquake Early Warning. In Japan, the Earthquake Early Warning ( EEW) (緊急地震速報, Kinkyū Jishin Sokuhō) is a warning issued when an earthquake is detected by multiple seismometers. [4] . These warnings are primarily issued by the Japan Meteorological Agency (JMA), with guidance on how to react to them. [5] [6] Introduction.
This is a list of earthquakes in Japan with either a magnitude greater than or equal to 7.0 or which caused significant damage or casualties. As indicated below, magnitude is measured on the Richter magnitude scale ( ML) or the moment magnitude scale ( Mw ), or the surface wave magnitude scale ( Ms) for very old earthquakes.
On 11 March 2011, at 14:46 JST (05:46 UTC), a Mw 9.0–9.1 undersea megathrust earthquake occurred in the Pacific Ocean, 72 km (45 mi) east of the Oshika Peninsula of the Tōhoku region. It lasted approximately six minutes and caused a tsunami. It is sometimes known in Japan as the "Great East Japan Earthquake" (東日本大震災, Higashi ...
- 6 minutes
- 2011-03-11 05:46:24
- 11 March 2011
- 14:46:24 JST
The 2011 Shizuoka earthquake (静岡県東部地震, Shizuoka-ken tо̄bu jishin) occurred approximately 42 km (26 mi) north-northeast of Shizuoka City at 22:31 JST, 15 March 2011. [1] [2] The magnitude was M w 6.0 or M JMA 6.4, [3] [4] [5] and the depth was 9 km (5.6 mi). [6] .
The 2016 Tottori earthquake (鳥取県中部地震, Tottori-ken Chūbu Jishin) [6] is an earthquake that occurred in central Tottori Prefecture in Japan on October 21, 2016. [7] [8] [9] It measured 6.2 on the moment magnitude scale. [10] [11] The earthquake left 32 people injured.
The Tōkai earthquakes ( Japanese: 東海地震) are major earthquakes that have occurred regularly with a return period of 100 to 150 years in the Tōkai region of Japan. The Tōkai segment has been struck by earthquakes in 1498, 1605, 1707, and 1854. [1] .
The 1982 Urakawa earthquake ( Japanese: 浦河沖地震 [6]) was a Mw 6.9 earthquake that struck off the coast of Urakawa, Japan, on 11:32 ( JST ), March 21, 1982. [7] [8] [9] The epicenter was 42.1°N 142.6°E. [10] . The earthquake was the largest earthquake in the history of the region. The earthquake caused 167 injuries and damage in Tomakomai and Sapporo.
