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1833 Shōnai Earthquake
The occurred at around 14:00 on December 7, 1833. It struck with an epicenter in the Sea of Japan, off the coast of Yamagata Prefecture, Japan. A tsunami was triggered by the estimated 7.5–7.7 earthquake. One hundred and fifty people were killed and there was severe damage in the prefecture. Tectonic setting Japan is situated on a convergent boundary between the Pacific, Philippine Sea, Okhotsk and Amurian Plates. Along the island arc's east and southeast coast, subduction of the Pacific and Philippine Sea plates occur at the Japan Trench and Nankai Trough, respectively. The west coast of Honshu, bordering the Sea of Japan, is a north–south trending convergent boundary. This boundary between the Amurian and Okhotsk Plates is thought to be an incipient subduction zone, consisting of eastward-dipping thrust faults. Convergent tectonics have been occurring in the region since the end of the Pliocene. Earthquakes and tsunamis are produced on thrust faults that form the boundary ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japan Standard Time
, or , is the standard time zone in Japan, 9 hours ahead of UTC (UTC+09:00). Japan does not observe daylight saving time, though its introduction has been debated on several occasions. During World War II, the time zone was often referred to as Tokyo Standard Time. Japan Standard Time is equivalent to Time in South Korea, Korean Standard Time, Time in North Korea, Pyongyang Time (North Korea), Time in Indonesia, Eastern Indonesia Standard Time, Time in East Timor, East-Timorese Standard Time, Time in Palau, Palau Time, and Yakutsk Time (Russia). History Before the Meiji (era), Meiji era (1868–1912), each local region had its own time zone in which noon was when the sun was exactly at its culmination. As modern transportation methods, such as trains, were adopted, this practice became a source of confusion. For example, there is a difference of about 5 degrees longitude between Tokyo and Osaka and because of this, a train that departed from Tokyo would arrive at Osaka 20 minu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moment Magnitude Scale
The moment magnitude scale (MMS; denoted explicitly with or Mwg, and generally implied with use of a single M for magnitude) is a measure of an earthquake's magnitude ("size" or strength) based on its seismic moment. was defined in a 1979 paper by Thomas C. Hanks and Hiroo Kanamori. Similar to the local magnitude scale, local magnitude/Richter scale () defined by Charles Francis Richter in 1935, it uses a logarithmic scale; small earthquakes have approximately the same magnitudes on both scales. Despite the difference, news media often use the term "Richter scale" when referring to the moment magnitude scale. Moment magnitude () is considered the authoritative magnitude scale for ranking earthquakes by size. It is more directly related to the energy of an earthquake than other scales, and does not saturatethat is, it does not underestimate magnitudes as other scales do in certain conditions. It has become the standard scale used by seismological authorities like the United State ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Izumozaki
is a town located in Niigata Prefecture, Japan. , the town had an estimated population of 4,190, and a population density of 94.4 persons per km2. The total area of the town was . Geography Izumozaki is located in a coastal region of central Niigata Prefecture bordered by the Sea of Japan to the west. Surrounding municipalities *Niigata Prefecture ** Kashiwazaki ** Nagaoka Climate Izumozaki has a humid climate (Köppen ''Cfa'') characterized by warm, wet summers and cold winters with heavy snowfall. The average annual temperature in Izumozaki is 12.6 °C. The average annual rainfall is 2261 mm with September as the wettest month. The temperatures are highest on average in August, at around 25.7 °C, and lowest in January, at around 0.7 °C. Demographics Per Japanese census data, the population of Izumozaki has declined steadily over the past 50 years. History The area of present-day Izumozaki was part of ancient Echigo Province. During the Edo period, i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ajigasawa, Aomori
is a List of towns in Japan, town located in Aomori Prefecture, Japan. , the town had an estimated population of 8,951 in 4394 households, and a population density of 26 persons per km2. The total area of the town is . Geography Ajigasawa is in Nishitsugaru District, Aomori southwestern corner of Aomori Prefecture on the border with Akita Prefecture, facing the Sea of Japan to the northwest, and the slopes of Mount Iwaki to the southeast. Part of the town is located within the borders of the Shirakami-Sanchi, a UNESCO World Heritage Site, and some coastal areas of the town are within the Tsugaru Quasi-National Park. The Akaishi Keiryū Anmon no Taki Prefectural Natural Park is also partly located within the borders of Ajigasawa. Neighbouring municipalities Akita Prefecture *Fujisato, Akita, Fujisato *Happō, Akita, Happō Aomori Prefecture *Fukaura, Aomori, Fukaura *Hirosaki, Aomori, Hirosaki *Nishimeya, Aomori, Nishimeya *Tsugaru, Aomori, Tsugaru Climate The town has a cold ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kisakata, Akita
was a town located in Yuri District, Akita Prefecture, Japan. In 2003, the town had an estimated population of 12,836 and a density of 103.50 persons per km2. The total area was 124.02 km2. On October 1, 2005, Kisakata, along with the town of Konoura, was merged into the town of Nikaho (all from Yuri District) to become the city of Nikaho. The poet Bashō visited Kisakata as part of his 1689 travels in Honshū, and composed a famous waka about Kisakata's islands. However, an eruption of Mount Chōkai is an active volcano located on the border of Akita and Yamagata in the Tōhoku region of Japan, and is tall. Because of its (roughly) symmetrical shape and massive size, it is also variously known as , or depending on the location of the vi ... and Kisakata earthquake in 1804 caused the sea bed to rise, and the islands are now surrounded by land, not water. There is a statue of Bashō at the Kanman Temple, which he visited. For hikers and climbers Kisakata ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seismic Gap
A seismic gap is a segment of an active fault known to produce significant earthquakes that has not slipped in an unusually long time, compared with other segments along the same structure. There is a hypothesis or theory that states that over long periods, the displacement on any segment must be equal to that experienced by all the other parts of the fault. Any large and longstanding gap is, therefore, considered to be the fault segment most likely to suffer future earthquakes. The applicability of this approach has been criticised by some seismologists, although earthquakes sometimes have occurred in previously identified seismic gaps. Examples Loma Prieta Seismic Gap, California Prior to the 1989 Loma Prieta earthquake( = 6.9), that segment of the San Andreas Fault system recorded much less seismic activity than other parts of the fault. The main shock and aftershocks of the 1989 event occurred within the previous seismic gap. Central Kuril gap, Russia Immediately following th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moment Magnitude
The moment magnitude scale (MMS; denoted explicitly with or Mwg, and generally implied with use of a single M for magnitude) is a measure of an earthquake's magnitude ("size" or strength) based on its seismic moment. was defined in a 1979 paper by Thomas C. Hanks and Hiroo Kanamori. Similar to the local magnitude/Richter scale () defined by Charles Francis Richter in 1935, it uses a logarithmic scale; small earthquakes have approximately the same magnitudes on both scales. Despite the difference, news media often use the term "Richter scale" when referring to the moment magnitude scale. Moment magnitude () is considered the authoritative magnitude scale for ranking earthquakes by size. It is more directly related to the energy of an earthquake than other scales, and does not saturatethat is, it does not underestimate magnitudes as other scales do in certain conditions. It has become the standard scale used by seismological authorities like the United States Geological SurveyTh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seismic Intensity Scales
Seismic intensity scales categorize the intensity or severity of ground shaking (quaking) at a given location, such as resulting from an earthquake. They are distinguished from seismic magnitude scales, which measure the magnitude or overall strength of an earthquake, which may, or perhaps may not, cause perceptible shaking. Intensity scales are based on the observed effects of the shaking, such as the degree to which people or animals were alarmed, and the extent and severity of damage to different kinds of structures or natural features. The maximal intensity observed, and the extent of the area where shaking was felt (see isoseismal map, below), can be used to estimate the location and magnitude of the source earthquake; this is especially useful for historical earthquakes where there is no instrumental record. Ground shaking Ground shaking can be caused in various ways (volcanic tremors, avalanches, large explosions, etc.), but shaking intense enough to cause damage is usuall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earthquake Rupture
In seismology, an earthquake rupture is the extent of slip that occurs during an earthquake in the Earth's crust. Earthquakes occur for many reasons that include: landslides, movement of magma in a volcano, the formation of a new fault, or, most commonly of all, a slip on an existing fault. Nucleation A tectonic earthquake begins by an initial rupture at a point on the fault surface, a process known as nucleation. The scale of the nucleation zone is uncertain, with some evidence, such as the rupture dimensions of the smallest earthquakes, suggesting that it is smaller than 100 m while other evidence, such as a slow component revealed by low-frequency spectra of some earthquakes, suggest that it is larger. The possibility that the nucleation involves some sort of preparation process is supported by the observation that about 40% of earthquakes are preceded by foreshocks. However, some large earthquakes, such as the M8.6 1950 India – China earthquake., have no foreshocks and it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1993 Okushiri Earthquake
The or Okushiri earthquake occurred at 13:17:12 UTC on 12 July 1993 in the Sea of Japan near the island of Hokkaido.Japan Meteorological Agency officially named this earthquake 平成5年(1993年)北海道南西沖地震 (''Heisei 5 nen (1993 nen) Hokkaidō nansei-oki jishin'', literally ''the 1993 Southwest-off Hokkaido Earthquake'')気象庁が命名した気象及び地震火山現象 It had a magnitude of 7.7 on the moment magnitude scale and a maximum felt intensity of VIII (''Severe'') on the Mercalli intensity scale. It triggered a major tsunami that caused deaths on Hokkaidō and in southeastern Russia, with a total of 230 fatalities recorded. The island of Okushiri was hardest hit, with 165 casualties from the earthquake, the tsunami and a large landslide. Tectonic setting The northwestern side of Honshu lies on the southeastern margin of the Sea of Japan, an area of oceanic crust created by back-arc spreading associated with the convergent boundary where the Pacific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1983 Sea Of Japan Earthquake
1983 saw both the official beginning of the Internet and the first mobile cellular telephone call. Events January * January 1 – The migration of the ARPANET to TCP/IP is officially completed (this is considered to be the beginning of the true Internet). * January 6 – Pope John Paul II appoints a bishop over the Czechoslovak exile community, which the ''Rudé právo'' newspaper calls a "provocation." This begins a year-long disagreement between the Czechoslovak Socialist Republic and the Vatican, leading to the eventual restoration of diplomatic relations between the two states. * January 14 – The head of Bangladesh's military dictatorship, Hussain Muhammad Ershad, announces his intentions to "turn Bangladesh into an Islamic state." * January 18 – U.S. Secretary of the Interior James G. Watt makes controversial remarks blaming poor living conditions on Native American reservations on "the failures of socialism." Watt will eventually resign in September after a series o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
