- Source: 1965 Rat Islands earthquake
The 1965 Rat Islands earthquake occurred at 05:01 UTC, on 4 February (19:01, 3 February local time). It had a magnitude of 8.7 and triggered a tsunami of over 10 m on Shemya Island, but caused very little damage.
Tectonic setting
The Rat Islands form part of the Aleutian Islands, a chain of volcanic islands forming an island arc, that results from the subduction of the Pacific plate beneath the North American plate. This plate boundary, the Aleutian Trench, has been the location of many megathrust earthquakes.
Characteristics
The 1965 Rat Islands earthquake share common features with the 1963 Kuril Islands earthquake and the 1964 Alaska earthquake.
= Earthquake
=The earthquake was associated with a 600 km long rupture along the plate boundary, based on the distribution of aftershocks. The pattern of energy release suggest the presence of three asperities along the plate interface, each causing a pulse of moment release. Modelling of the tsunami supports the idea that the earthquake consisted of three sub-events, related to three structural 'blocks' within the overriding plate.
The main shock was followed by an earthquake of magnitude 7.6 nearly two months later, that triggered a small tsunami. This was not an aftershock, but a normal fault event within the outer rise of the subducting plate, triggered by the earlier event.
= Tsunami
=The tsunami had a maximum run-up height of 10.7 m on Shemya Island, 2.0 m at Amchitka Island, 1.6 m at Attu Island and 1.1 m in northern Kauai, Hawaii. It was also observed in Peru, Ecuador, Mexico, California, Japan and eastern Russia.
Damage
Flooding from the tsunami caused $10,000 worth of damage on Amchitka Island. Minor damage from the earthquake was recorded on both Attu and Shemya islands in the form of cracks in runways.
See also
2021 Chignik earthquake
List of earthquakes in 1965
List of earthquakes in Alaska
List of earthquakes in the United States
References
Further reading
Jordan, James N.; Lander, James F.; Black, Rudolph A. (1965). "Aftershocks of the 4 February 1965 Rat Island Earthquake". Science. 148 (3675): 1323–1325. Bibcode:1965Sci...148.1323J. doi:10.1126/science.148.3675.1323. JSTOR 1716000. PMID 17791261. S2CID 11528694.
External links
The International Seismological Centre has a bibliography and/or authoritative data for this event.
Kata Kunci Pencarian:
- Daftar gempa bumi terkuat sepanjang sejarah
- Academy Award untuk Sinematografi Terbaik
- 1965 Rat Islands earthquake
- Rat Islands
- 2002 Denali earthquake
- 2001 southern Peru earthquake
- 2021 Chignik earthquake
- 1964 Alaska earthquake
- List of earthquakes in the United States
- Lists of earthquakes
- List of megathrust earthquakes
- Hawadax Island
