The 1965 Rat Islands earthquake occurred at 05:01 UTC, on 4 February (19:01, 3 February local time[1]). It had a magnitude of 8.7 and triggered a tsunami of over 10 m on Shemya Island,[2] but caused very little damage.
The earthquake was associated with a 600 km long rupture along the plate boundary, based on the distribution of aftershocks.[4] 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.[5]
The main shock was followed by an earthquake of magnitude 7.6 nearly two months later, that triggered a small tsunami.[1] This was not an aftershock, but a normal fault event within the outer rise of the subducting plate, triggered by the earlier event.[6]
Flooding from the tsunami caused $10,000 worth of damage on Amchitka Island.[2] Minor damage from the earthquake was recorded on both Attu and Shemya islands in the form of cracks in runways.
^ abcdNGDC. . Archived from the original on December 30, 2017. Retrieved 8 March 2010.
^ abUSGS (26 October 2009). . Archived from the original on 16 January 2010. Retrieved 8 March 2010.
^Wu, Francis T.; Kanamori, Hiroo (9 October 1973). "Source mechanism of February 4, 1965, Rat Island earthquake". Journal of Geophysical Research. 78 (26): 6082–6092. Bibcode:1973JGR....78.6082W. doi:10.1029/jb078i026p06082.
^Beck, Susan L.; Christensen, Douglas H. (1991). "Rupture process of the February 4, 1965, Rat Islands Earthquake". Journal of Geophysical Research. 96 (B2): 2205. Bibcode:1991JGR....96.2205B. doi:10.1029/90JB02092.
^Johnson, Jean M. (1998). "Heterogeneous Coupling Along Alaska-Aleutians as Inferred from Tsunami, Seismic, and Geodetic Inversions". Tsunamigenic Earthquakes and Their Consequences. Advances in Geophysics. Vol. 39. pp. 1–116. doi:10.1016/S0065-2687(08)60275-7. ISBN978-0-12-018839-0.
^Abe, Katsuyuki (January 1972). "Lithospheric normal faulting beneath the Aleutian trench". Physics of the Earth and Planetary Interiors. 5: 190–198. Bibcode:1972PEPI....5..190A. doi:10.1016/0031-9201(72)90091-X.
Further readingedit
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 linksedit
The International Seismological Centre has a bibliography and/or authoritative data for this event.
January 01, 1970
1965, islands, earthquake, occurred, february, february, local, time, magnitude, triggered, tsunami, over, shemya, island, caused, very, little, damage, time1965, 22isc, event859206usgs, ansscomcatlocal, datefebruary, 1965, 1965, local, time19, 22magnitude8, m. The 1965 Rat Islands earthquake occurred at 05 01 UTC on 4 February 19 01 3 February local time 1 It had a magnitude of 8 7 and triggered a tsunami of over 10 m on Shemya Island 2 but caused very little damage 1965 Rat Islands earthquakeUTC time1965 02 04 05 01 22ISC event859206USGS ANSSComCatLocal dateFebruary 3 1965 1965 02 03 Local time19 01 22Magnitude8 7 MwDepth30 3 km 19 mi Epicenter51 17 N 178 33 E 51 29 N 178 55 E 51 29 178 55Areas affectedUnited States Alaska Total damage 10 000Max intensityMMI VI Strong 1 Tsunami10 7 m 35 ft Contents 1 Tectonic setting 2 Characteristics 2 1 Earthquake 2 2 Tsunami 3 Damage 4 See also 5 References 6 Further reading 7 External linksTectonic setting editThe 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 edit nbsp Map showing the tectonics and seismicity of Alaska The 1965 Rat Islands earthquake share common features with the 1963 Kuril Islands earthquake and the 1964 Alaska earthquake 3 Earthquake edit The earthquake was associated with a 600 km long rupture along the plate boundary based on the distribution of aftershocks 4 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 5 The main shock was followed by an earthquake of magnitude 7 6 nearly two months later that triggered a small tsunami 1 This was not an aftershock but a normal fault event within the outer rise of the subducting plate triggered by the earlier event 6 Tsunami edit 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 1 Damage editFlooding from the tsunami caused 10 000 worth of damage on Amchitka Island 2 Minor damage from the earthquake was recorded on both Attu and Shemya islands in the form of cracks in runways See also editList of earthquakes in 1965 List of earthquakes in Alaska List of earthquakes in the United States 2021 Chignik earthquakeReferences edit a b c d NGDC Search result for 1965 Alaska earthquakes Archived from the original on December 30 2017 Retrieved 8 March 2010 a b USGS 26 October 2009 Historic Earthquakes Rat Islands Alaska Archived from the original on 16 January 2010 Retrieved 8 March 2010 Wu Francis T Kanamori Hiroo 9 October 1973 Source mechanism of February 4 1965 Rat Island earthquake Journal of Geophysical Research 78 26 6082 6092 Bibcode 1973JGR 78 6082W doi 10 1029 jb078i026p06082 Beck Susan L Christensen Douglas H 1991 Rupture process of the February 4 1965 Rat Islands Earthquake Journal of Geophysical Research 96 B2 2205 Bibcode 1991JGR 96 2205B doi 10 1029 90JB02092 Johnson Jean M 1998 Heterogeneous Coupling Along Alaska Aleutians as Inferred from Tsunami Seismic and Geodetic Inversions Tsunamigenic Earthquakes and Their Consequences Advances in Geophysics Vol 39 pp 1 116 doi 10 1016 S0065 2687 08 60275 7 ISBN 978 0 12 018839 0 Abe Katsuyuki January 1972 Lithospheric normal faulting beneath the Aleutian trench Physics of the Earth and Planetary Interiors 5 190 198 Bibcode 1972PEPI 5 190A doi 10 1016 0031 9201 72 90091 X Further reading editJordan 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 editThe International Seismological Centre has a bibliography and or authoritative data for this event Retrieved from https en wikipedia org w index php title 1965 Rat Islands earthquake amp oldid 1222458043, wikipedia, wiki, book, books, library,
