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2008 Iwate–Miyagi Nairiku earthquake

Earthquake in Japan

2008 Iwate–Miyagi Nairiku earthquake

Earthquake in Japan

FieldValue
titleIwate–Miyagi Nairiku earthquake
timestamp2008-06-13 23:43:45
anss-urlusp000g9h6
isc-event13377361
local-date
local-time08:43 JST
image岩手・宮城内陸地震による河道閉塞（迫川・栗原市浅布地区）.jpg
captionRiver channel blockage in the Sako River after the earthquake
mapUSGS ShakeMap 2008tfdp.jpg
magnitude7.2
6.9
depth10 km (USGS)
8 km (JMA)
aftershocks483 felt aftershocks by 1 July (JMA)
Largest: 5.7 on 14 June (9:20 JST)
location
typeReverse – Intraplate
casualties12 dead, 436 injured (1 July 2007 at 17:00 JST)
intensity
map2{{Location mapJapan
lat_deg39lat_min=1.7
lon_deg140lon_min=52.8
positionright
width250
floatcenter
markBullseye1.png
marksize40
reliefyes
caption}}
native_name岩手・宮城内陸地震
native_name_langja
affectedIwate Prefecture, Tōhoku region, Japan
map_captionUSGS ShakeMap
pga4.36 *g* (vector sum)
4278 Gal

| anss-url = usp000g9h6 | isc-event = 13377361 | local-date = | local-time = 08:43 JST 6.9 8 km (JMA) Largest: 5.7 on 14 June (9:20 JST) 4278 Gal

On 14 June, the 2008 Iwate earthquake struck the Tōhoku region of northeastern Honshū in Japan. Japan Meteorological Agency (JMA) officially named this earthquake the Iwate–Miyagi Nairiku earthquake in 2008. This earthquake occurred in the south of the inland of Iwate Prefecture at 8:43 JST on June 14 (23:43 UTC on June 13). The JMA magnitude was estimated at 7.2, and the moment magnitude by USGS was at 6.9. The epicenter was located at , about 85 kilometres (55 mi) north of Sendai and about 385 kilometres (240 mi) north-northeast of Tokyo.

The strongest shaking was measured in the cities of Ōshū (Iwate) and Kurihara (Miyagi), both of which were measured as "strong 6" on the Japan Meteorological Agency seismic intensity scale, shindo. Peak ground acceleration readings were high, with a maximum vector sum (3 component) value of 4,278 cm/s2 (4.36 g).

Intensity

Seismic intensity represents the strength of ground motion. JMA uses the scales of 0 to 7: 0, 1, 2, 3, 4, weak/strong 5, weak/strong 6, 7.

PrefectureSeismic intensities
Iwate6+
Miyagi6+
Akita
Yamagata
Fukushima
Aomori
Ibaraki
Tochigi
Niigata
Hokkaidō
Gunma
Saitama
Chiba
Tokyo
Kanagawa
Yamanashi
Ishikawa
Nagano
Shizuoka
Aichi

Tremors were felt across a large area.

IntensityPrefectureLocation6+6-5+5-
IwateŌshū
MiyagiKurihara
MiyagiOsaki
AkitaYuzawa, Higashinaruse
IwateKitakami, Ichinoseki, Kanegasaki, Hiraizumi
MiyagiKami, Wakuya, Tome, Misato, Natori, Sendai (Miyagino, Wakabayashi), Rifu
AkitaYokote, Ugo, Misato, Daisen
IwateTono, Fujisawa, Nishiwaga
MiyagiShikama, Kakuda, Iwanuma, Zao, Ogawara, Kawasaki, Sendai (Aoba, Izumi), Ishinomaki, Ohira
YamagataMogami
FukushimaShinchi

Tectonics

According to the United States Geological Survey:

The Mw 6.8 Honshu earthquake of June 13th 2008 occurred in a region of convergence between the Pacific plate and the Okhotsk section of the North American plate in northern Japan, where the Pacific plate is moving west-northwest with respect to North America at a rate of approximately 8.3 cm/yr. The hypocenter of the earthquake indicates shallow thrusting motion in the upper (Okhotsk) plate, above the subducting Pacific plate, which lies at approximately 80 km depth at this location.
The earthquake occurred in a region of upper-plate contraction, probably within the complicated tectonics of the Ou Backbone Range, known to have hosted several large earthquakes in historic times. The largest of these events occurred in 1896, approximately 70 km north of the June 13th event, and killed over 200 people in the local area.

Aftershocks

According to JMA:

Aftershocks of this earthquake were stronger than the Great Hanshin earthquake in 1995, but they happened much less frequently.

Over 200 aftershocks were observed in the first 24 hours, with about 400 in total over the first seven days. The largest ones (with Mj5.0 or greater) were :June 14, 9:20: Mj5.7: Max. seismic intensity reached Strong 5; :June 14, 12:27: Mj5.2: Max. seismic intensity reached 4; :June 16, 23:14: Mj5.3: Max. seismic intensity reached 4. From June 21 to July 1, four to 12 aftershocks were observed each day, with maximum seismic intensities of 3.

Effects

Riho Bridge collapsed after the earthquake

Landslides

Landslides triggered by this earthquake crushed structures, buried people, cut off access to certain roads, and isolated some rural communities. Mud from landslides dammed up rivers to form lakes called "quake lakes".

By June 19, the Ministry of Land had identified fifteen quake lakes in Iwate and Miyagi prefectures, and work crews began draining three of them which were at high risk of overflow or breach from rain or aftershocks.

Human casualties

By 17:50 JST, June 25, twelve people were confirmed dead and 358 injured, and ten still missing.

  • In the city of Kurihara, Miyagi Pref., five people were buried in a landslide at a hot-spring inn called Komanoyu, which had stood on the mountainside of Mt. Kurikoma. A woman aged 80 who had co-managed the inn with her husband, her 58-year-old son, a woman aged 75 who had worked at the inn, a 48-year-old tourism consultant, and an attendant of the Railway Museum aged 35 were all killed in the landslide.
  • In the city of Kurihara, along Route 398, a landslide overwhelmed and killed three workers setting a rockfall containment net on a hillside.{{cite news|url=http://www.asahi.com/special/08006/TKY200806200253.html|script-title=ja:１遺体発見 死者１２人・不明１０人に 岩手・宮城地震
  • Also in the city of Kurihara, along Route 398, a 59-year-old man was killed when his car was carried away by a landslide and buried.
  • At a dam construction site in the city of Ōshū, Iwate Pref., a worker aged 48 was struck by falling rocks and died.
  • In the city of Ichinoseki, Iwate Pref., a person surprised by the tremor ran out into the road and was fatally struck by a truck.
  • In the city of Iwaki, Fukushima Pref., near a fishing port, a person aged 55 was struck by falling rocks while fishing, fell into the sea, and drowned.
  • In the city of Ōshū, a landslide caused a group of 20 people to become temporarily trapped in an overturned bus.{{cite news

Electric power supply

No nuclear power plants were shut down following this earthquake unlike the 2007 Chūetsu offshore earthquake quake. Some water was found to have splashed out of a reaction container in the Fukushima II Nuclear Power Plant possibly due to the tremor, but no radioactive material was released to the environment.

Expressways and railways

Expressways in Tōhoku region were closed in several sections, but all reopened by nighttime, barring traffic restrictions in one section for repair work.

Some train services by JR East were suspended on Shinkansen and local lines, and resumed on the following day from the first scheduled trains.

On Tōhoku Shinkansen, all running trains, about 20, were stopped by an earthquake detection system. Most were soon moved to the nearest stations.{{cite news|url=http://sankei.jp.msn.com/affairs/disaster/080614/dst0806141931068-n1.htm |script-title=ja:【岩手・宮城内陸地震】「脱線せず」はＪＲの対策が奏功か 震源からの距離も影響？|date=2008-06-14|access-date=2008-06-18|publisher=The Sankei Shimbun|language=ja |archive-url = https://web.archive.org/web/20080619054231/http://sankei.jp.msn.com/affairs/disaster/080614/dst0806141931068-n1.htm |archive-date = 2008-06-19}} However, about 2,000 passengers were temporarily trapped inside three trains before being evacuated up to nine and a half hours later, because the trains were forced to stay in place while equipment inspections were carried out.

Suspensions on Tōhoku, Akita, Yamagata Shinkansen and delays on Jōetsu, Nagano Shinkansen reportedly involved 117,000 passengers. No trains derailed.

References

References

  1. "Result of searching the database of felt earthquakes run by". Japan Meteorological Agency.
  2. link. (2008-06-14). Japan Meteorological Agency
  3. link. (2008-06-14). Japan Meteorological Agency]
  4. (2008-06-14). "Magnitude 6.9 – EASTERN HONSHU, JAPAN". United States Geological Survey.
  5. "Calculation tool". Geographical Survey Institute.
  6. Masumi Yamada. (July–August 2010). "Spatially Dense Velocity Structure Exploration in the Source Region of the Iwate-Miyagi Nairiku Earthquake". Seismological Society of America.
  7. "震度データベース検索". Japan Meteorological Agency.
  8. (2008-07-02). "「平成20年（2008年）岩手・宮城内陸地震」の余震回数". Japan Meteorological Agency].
  9. link. (2008-06-23). Japan Meteorological Agency
  10. link. (2008-06-26). Japan Meteorological Agency]
  11. (2008-06-14). "岩手・宮城内陸地震：６人死亡、１５５人負傷 不明１１人". The Mainichi Newspapers.
  12. (2008-06-17). "Rush to drain 'quake lakes' in Tohoku". Mainichi Daily News.
  13. link. (2008-06-19). Ministry of Land, Infrastructure, Transport and Tourism
  14. (2008-06-19). "Water being pumped out of quake lakes". NHK.
  15. link. (2008-06-19). NHK. (August 2018)
  16. (2008-06-25). "平成２０年（２００８年）岩手・宮城内陸地震（第５１報）". Fire and Disaster Management Agency.
  17. link. (2008-06-15). The Yomiuri Shimbun
  18. link. (2008-06-15). The Asahi Shimbun Company
  19. link. (2008-06-17). The Asahi Shimbun Company
  20. link. (2008-06-18). The Asahi Shimbun Company
  21. link. (2008-06-14). The Asahi Shimbun Company
  22. link. (2008-06-14). The Asahi Shimbun Company
  23. link. (2008-06-15). The Asahi Shimbun Company
  24. (2008-06-14). "岩手・宮城内陸地震：バスが沢に転落、１人重体 奥州市". The Mainichi Newspapers.
  25. (2008-06-14). "平成２０年岩手・宮城内陸地震被害情報（第８報）（６月１４日１７時００現在）". Nuclear and Industrial Safety Agency, Ministry of Economy, Trade and Industry.
  26. link. (2008-06-15). The Mainichi Newspapers. (October 2010)
  27. link. (2008-06-14). East Nippon Expressway Company Limited
  28. (2008-06-15). "岩手・宮城地震：１５日始発からすべて運行…ＪＲ東日本". The Mainichi Newspapers.
  29. (2008-06-14). "2,000 passengers trapped in bullet trains, 20,000 households lose power after quake". Mainichi Daily News.
  30. (2008-06-14). "岩手・宮城内陸地震：新幹線に９時間半閉じ込め 道路寸断". The Mainichi Newspapers.
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This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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