1968 Tokachi earthquake

1968 Tokachi earthquake
UTC time	1968-05-16 00:49:02
ISC event	821946
USGS- ANSS	ComCat
Local date	May 16, 1968
Local time	09:49:02
Magnitude	8.3 M w
Depth	26 km (16 mi)
Epicenter	40°54′N 143°21′E / 40.90°N 143.35°E
Type	Oblique-slip
Areas affected	Japan
Max. intensity	MMI VI ( Strong ) ; ; JMA 5?
Tsunami	6 m (20 ft)
Aftershocks	7.9 M w (ISC)   May 16 at 20:39
Casualties	47?52 killed ; 281?330 injured

The 1968 Tokachi earthquake (1968年十勝沖地震 Sen-ky?hyaku-rokuj?hachi-nen Tokachi-oki Jishin ) occurred on May 16 at 0:49 UTC (09:49 local time) in the area offshore of Aomori and Hokkaido . The magnitude of this earthquake was put at M _w 8.3. ^[4] The intensity of the earthquake reached shindo 5 in Aomori , Aomori and Hakodate , Hokkaido. ^[3]

Geology [ edit ]

This earthquake was located near the junction of the Kuril Trench and the Japan Trench . It was an interplate earthquake. ^[5] The focal mechanism of this earthquake showed movement on a thrust fault with a considerable slip-strike component. ^[4] The sum of interplate seismic moment release by seismic and aseismic faulting in this earthquake was about 28×10 ²⁰ N m. The 1960s was noted as one of the peak periods of interplate seismic moment release in the offshore Sanriku region. ^[6]

Damage [ edit ]

Heavy rain occurred due to a low pressure system in the days leading up to the earthquake and aggravated the damage. In Hokkaido, building damage was reported. A four-story RC building of Hakodate University collapsed. ^[7] In Aomori Prefecture, there was damage to railroads and highways in more than 200 places caused by collapses of artificial embankments. In Hachinohe , there was damage to buildings, water pipes, and gas pipes. The three-story building of Hachinohe Technical College suffered severe damage. ^[8] The communication between Honshu and Hokkaido was cut off. ^[9]

Tsunami [ edit ]

A tsunami was triggered by the earthquake, ^[10] with a maximum height of about 6 m (20 ft). ^[11] An 11-centimeter (4.3 in) high tsunami was recorded in Tahiti . ^[12] In Japan, the tsunami caused flooding and damage to aquaculture. ^[10]

References [ edit ]

^ ^a ^b ^c ^d ^e ^f USGS (September 4, 2009), PAGER-CAT Earthquake Catalog , Version 2008_06.1, United States Geological Survey
^ National Geophysical Data Center / World Data Service (NGDC/WDS) (1972), Significant Earthquake Database , National Geophysical Data Center , NOAA , doi : 10.7289/V5TD9V7K
^ ^a ^b "Tsunami forecast Archives" (PDF) . Archived from the original (PDF) on 2013-10-29 . Retrieved 2012-04-09 .
^ ^a ^b Kanamori, H. (1971), "Focal Mechanism of the Tokachi-Oki Earthquake of May 16, 1968: Contortion of the Lithosphere at a Junction of Two Trenches", Tectonophysics , 12 (1): 1?13, Bibcode : 1971Tectp..12....1K , doi : 10.1016/0040-1951(71)90063-1
^ Hisashi Suito; Mikio Iizuka; Kazuro Hirahara (13 November 2003). "Crustal Deformation Model in Northeast Japan" (PDF) . Archived from the original (PDF) on 2015-03-01 . Retrieved 2014-09-12 .
^ "Space-time distribution of interplate moment release including slow earthquakes and the seismo-geodetic coupling in the Sanriku-oki region along the Japan trench" by I. Kawasaki, Y. Asai, and Y. Tamura
^ Masaya HIROSAWA; Tomoaki AKIYAMA; Tatsuya KONDO & Jiandong ZHOU (16 December 1999). "DAMAGES TO BEAM-TO-COLUMN JOINT PANELS OF R/C BUILDINGS CAUSED BY THE 1995 HYOGO-KEN NANBU EARTHQUAKE AND THE ANALYSIS" (PDF) . Retrieved 2014-09-12 .
^ "Geomorphological Accidents Caused by the Tokachi-oki Earthquake" by K. Nishimura, S. Segawa, H. Mizuno, H. Hotta, O. Miura, T. Tamura, and T. Akagiri
^ Junji Kiyono (19 September 2008). "Earthquake and lifeline damage" (PDF) . Archived from the original (PDF) on 2013-06-12 . Retrieved 2014-09-12 .
^ ^a ^b "十勝沖地震地震の?要" . Bousai.pref.aomori.jp. Archived from the original on 2015-09-23 . Retrieved 2014-09-12 .
^ 地震調査?究推進本部地震調査委員? (22 August 2008). "三陸沖から房?沖にかけての地震活動の長期評?の一部改訂について（平成21年3月9日公表）" (PDF) . Retrieved 2014-09-12 .
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External links [ edit ]

The International Seismological Centre has a bibliography and/or authoritative data for this event.

[PAGER-CAT-1] ^ ^a ^b ^c ^d ^e ^f USGS (September 4, 2009), PAGER-CAT Earthquake Catalog , Version 2008_06.1, United States Geological Survey

[NGDC-2] National Geophysical Data Center / World Data Service (NGDC/WDS) (1972), Significant Earthquake Database , National Geophysical Data Center , NOAA , doi : 10.7289/V5TD9V7K

[TFA-3] "Tsunami forecast Archives" (PDF) . Archived from the original (PDF) on 2013-10-29 . Retrieved 2012-04-09 .

[Kanamori-4] Kanamori, H. (1971), "Focal Mechanism of the Tokachi-Oki Earthquake of May 16, 1968: Contortion of the Lithosphere at a Junction of Two Trenches", Tectonophysics , 12 (1): 1?13, Bibcode : 1971Tectp..12....1K , doi : 10.1016/0040-1951(71)90063-1

[aces-5] Hisashi Suito; Mikio Iizuka; Kazuro Hirahara (13 November 2003). "Crustal Deformation Model in Northeast Japan" (PDF) . Archived from the original (PDF) on 2015-03-01 . Retrieved 2014-09-12 .

[6] "Space-time distribution of interplate moment release including slow earthquakes and the seismo-geodetic coupling in the Sanriku-oki region along the Japan trench" by I. Kawasaki, Y. Asai, and Y. Tamura

[iitk-7] Masaya HIROSAWA; Tomoaki AKIYAMA; Tatsuya KONDO & Jiandong ZHOU (16 December 1999). "DAMAGES TO BEAM-TO-COLUMN JOINT PANELS OF R/C BUILDINGS CAUSED BY THE 1995 HYOGO-KEN NANBU EARTHQUAKE AND THE ANALYSIS" (PDF) . Retrieved 2014-09-12 .

[8] "Geomorphological Accidents Caused by the Tokachi-oki Earthquake" by K. Nishimura, S. Segawa, H. Mizuno, H. Hotta, O. Miura, T. Tamura, and T. Akagiri

[nagoya-u-9] Junji Kiyono (19 September 2008). "Earthquake and lifeline damage" (PDF) . Archived from the original (PDF) on 2013-06-12 . Retrieved 2014-09-12 .

[Aomori-10] "十勝沖地震地震の?要" . Bousai.pref.aomori.jp. Archived from the original on 2015-09-23 . Retrieved 2014-09-12 .

[jishin-11] 地震調査?究推進本部地震調査委員? (22 August 2008). "三陸沖から房?沖にかけての地震活動の長期評?の一部改訂について（平成21年3月9日公表）" (PDF) . Retrieved 2014-09-12 .

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v t e Earthquakes in Japan
Historical	679 Tsukushi 684 Hakuho 869 J?gan 1293 Kamakura 1361 Sh?hei 1498 Mei? 1586 Tensh? 1596 Fushimi 1605 Keich? 1611 Aizu 1611 Sanriku 1662 Kanbun 1662 Hy?ga-nada 1677 B?s? 1703 Genroku 1707 H?ei 1741 Kampo 1751 Takada 1771 Great Yaeyama 1792 Unzen 1804 Kisakata 1828 Sanj? 1833 Sh?nai 1847 Zenkoji 1854 Iga?Ueno 1854 Nankai 1854 T?kai 1855 Edo 1858 Hietsu 1872 Hamada 1889 Kumamoto 1891 Mino?Owari 1894 Tokyo 1894 Sh?nai 1896 Sanriku 1896 Rikuu
20th century	1909 Anegawa 1911 Kikai Island 1914 Senboku 1922 Shimabara 1923 Great Kant? 1925 North Tajima 1927 North Tango 1930 North Izu 1933 Sanriku 1936 Miyagi 1939 Oga 1940 Shakotan 1941 Hy?ga-nada 1943 Tottori 1944 T?nankai 1945 Mikawa 1946 Nankai 1948 Fukui 1952 Tokachi 1961 North Mino 1963 Kuril Islands 1964 Niigata 1968 Ebino 1968 Hy?ga-nada 1968 Tokachi 1973 Nemuro Peninsula 1974 Izu Peninsula 1978 Izu ?shima 1978 Miyagi 1982 Urakawa 1983 Sea of Japan 1984 Nagano 1993 Kushiro 1993 Okushiri 1994 offshore Sanriku 1995 Hanshin 2000 Izu Islands 2000 Tottori
21st century	2001 Geiyo 2003 Miyagi 2003 Tokachi 2004 Ch?etsu 2005 Fukuoka 2005 Miyagi 2006 Kuril Islands 2007 Ch?etsu 2007 Kuril Islands 2007 Noto 2008 Iwate?Miyagi 2008 Iwate 2009 Shizuoka 2011 T?hoku 2011 Nagano 2011 Shizuoka 2011 Miyagi 2011 Fukushima 2012 Chiba 2012 Sanriku 2014 Nagano 2015 Ogasawara 2016 Kumamoto 2016 Tottori 2016 Fukushima 2018 Osaka 2018 Hokkaido Eastern Iburi 2019 Yamagata 2021 Fukushima 2021 Miyagi 2021 Chiba 2022 Fukushima 2023 Noto 2024 Noto
Related articles	Nankai megathrust earthquakes T?kai earthquakes T?nankai earthquakes Nankai earthquakes South Kant? earthquakes Matsushiro earthquake swarm

v t e Japan Trench megathrust earthquakes
Notable Japan Trench megathrust quakes	869 J?gan earthquake 1611 Sanriku earthquake 1896 Sanriku earthquake 1968 Tokachi earthquake 1994 offshore Sanriku earthquake 2011 T?hoku earthquake and tsunami
Plate tectonics	Japan Trench Okhotsk Plate Pacific Plate megathrust earthquake Seismicity of the Sanriku coast Tsunami