Aomori Bay West Coast Fault Zone
The Aomori Bay West Coast Fault Zone (青森湾西岸断層帯, Aomoriwan-seigan Dansō-tai) is an active fault zone on the Tsugaru Peninsula in Aomori Prefecture and its capital city, Aomori. It is paralleled to east by the west coast of Aomori Bay and to the west by the Tsugaru Mountains, running from north-northwest to south-southeast on the peninsula, through the city of Aomori, and finally extending south toward the Hakkōda Mountains. The zone is made up of three faults: the Aomori Bay West Fault, the Nogiwa Fault, and the Nyunai Fault. The Nyunai fault is a reverse fault.[1][2]
| Aomori Bay West Coast Fault Zone | |
|---|---|
| 青森湾西岸断層帯 Aomoriwan-seigan Dansō-tai | |
 Aomori Prefecture with the Aomori Bay West Coast Fault Zone shown in red | |
  Location in Japan | |
| Country | Japan |
| Region | Tōhoku |
| Cities | Aomori, Yomogita |
| Characteristics | |
| Segments | Aomori Bay West Fault, Nogiwa Fault, Nyunai Fault |
| Length | 31 km (19 mi) |
| Displacement | 0.4–0.8 m (1.3–2.6 ft)/1000 years |
| Tectonics | |
| Plate | Okhotsk (maybe North America) |
| Status | Active |
| Type | reverse fault |
| Age | Miocene-recent |
| Orogeny | North Kitakami Belt |
Earthquakes
No major earthquakes can be directly attributed to the Aomori Bay West Coast Fault Zone during recorded history. There is a history of destructive earthquakes originating in the area, but they could have come from other faults on the peninsula.[3][4]
It has been estimated that the fault zone could produce an earthquake with a magnitude of 7.3 Mj. There is a 5-10 percent chance of an earthquake occurring on the zone in the next 300 years.[5]
See also
References
- "青森湾西岸断層帯" (in Japanese). Headquarters for Earthquake Research Promotion. Retrieved 20 June 2019.
- "Gravity survey and subsurface structure across the Aomoriwan-Seigan Fault Zone, Northeast Japan". 28 May 2019. Retrieved 20 June 2019.
- Hatori, Tokutaro. "Investigations of the Seismic Intensity and Tsunami of Historical Earthquakes (1964～1810) Occurring in the West Tsugaru to Oga Regions, the Japan Sea". University of Tokyo. Retrieved 21 June 2019.
- "青森県" (in Japanese). 地震調査研究推進本部. Retrieved 21 June 2019.
- "青森湾西岸断層帯の長期評価について" (in Japanese). 地震調査研究推進本部. 14 April 2004. Retrieved 21 June 2019.