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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 ...
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.
The boundary between Okhotsk microplate and Pacific plate is a subduction zone, where the Pacific plate subducts beneath the Okhotsk Plate. Many strong megathrust earthquakes occurred here, some of them among the largest on world record, including the Kamchatka earthquakes of 1737 (estimated M9.0~9.3) and 1952 (M9.0).
Hawaii – Southern: 7.9: X: 31–77: Limited damage / homes destroyed / tsunami: Note: The inclusion criteria for adding events are based on WikiProject Earthquakes' notability guideline that was developed for stand-alone articles. The principles described also apply to lists.
Tohoku (upper half of Honshu), Hokkaido, the Kuril Islands, and Sakhalin are located on the Okhotsk Plate. This is a minor tectonic plate bounded to the north by the North American Plate . [ 45 ] [ 46 ] The Okhotsk Plate is bounded on the east by the Pacific Plate at the Kuril–Kamchatka Trench and the Japan Trench.
Today, earthquakes are monitored by the Hawaiian Volcano Observatory run by the USGS. Hawaii accounted for 7.3% of the United States' reported earthquakes with a magnitude 3.5 or greater from 1974 to 2003, with a total 1533 earthquakes. Hawaii ranked as the state with the third most earthquakes over this time period, after Alaska and California ...
In Japan, the Shindo scale is commonly used to measure earthquakes by seismic intensity instead of magnitude. This is similar to the Modified Mercalli intensity scale used in the United States, the Liedu scale used in China or the European Macroseismic Scale (EMS), meaning that the scale measures the intensity of an earthquake at a given location instead of measuring the energy an earthquake ...
1963 Kuril Islands earthquake: 27 March 1964 17:36 (local time) Prince William Sound, Alaska: 131 9.2 M w [39] The second largest earthquake in recorded history. 1964 Alaska earthquake: 3 February 1965 19:01 (local time) Rat Islands, Alaska: 0 8.7 M w [40] One of the largest earthquake in recorded history. 1965 Rat Islands earthquake: 17 ...