Tsunami-generated turbidity current of the 2011 Tohoku-Oki earthquake

被引：76

作者：

Arai, Kazuno ^{[1
]}

Naruse, Hajime ^{[2
]}

Miura, Ryo ^{[3
]}

Kawamura, Kiichiro ^{[4
]}

Hino, Ryota ^{[5
]}

Ito, Yoshihiro ^{[5
]}

Inazu, Daisuke ^{[6
]}

Yokokawa, Miwa ^{[7
]}

Izumi, Norihiro ^{[8
]}

Murayama, Masafumi ^{[9
]}

Kasaya, Takafumi ^{[10
]}

机构：

[1] Chiba Univ, Grad Sch Sci, Dept Earth Sci, Inage Ku, Chiba 2638522, Japan

[2] Kyoto Univ, Grad Sch Sci, Div Earth & Planetary Sci, Sakyo Ku, Kyoto 6068502, Japan

[3] Nippon Marine Enterprises Ltd, Yokosuka, Kanagawa 2380004, Japan

[4] Yamaguchi Univ, Grad Sch Sci & Engn, Yamaguchi 7538512, Japan

[5] Tohoku Univ, Grad Sch Sci, Res Ctr Predict Earthquakes & Volcan Erupt, Aoba Ku, Sendai, Miyagi 9808578, Japan

[6] Natl Res Inst Earth Sci & Disaster Prevent, Tsukuba, Ibaraki 3050006, Japan

[7] Osaka Inst Technol, Fac Informat Sci & Technol, Hirakata, Osaka 5760196, Japan

[8] Hokkaido Univ, Dept Civil Engn, Kita Ku, Sapporo, Hokkaido 0608628, Japan

[9] Kochi Univ, Ctr Adv Marine Core Res, Nankoku, Kochi 7838502, Japan

[10] Japan Agcy Marine Earth Sci & Technol JAMSTEC, Inst Res Earth Evolut IFREE, Yokosuka, Kanagawa 2370061, Japan

来源：

GEOLOGY | 2013年 / 41卷 / 11期

关键词：

OFFSHORE; CANYONS; FLOWS;

D O I：

10.1130/G34777.1

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

We show the first real-time record of a turbidity current associated with a great earthquake, the Mw 9.0, 2011 Tohoku-Oki event offshore Japan. Turbidity current deposits (turbidites) have been used to estimate earthquake recurrence intervals from geologic records. Until now, however, there has been no direct evidence for large-scale earthquakes in subduction plate margins. After the 2011 Tohoku-Oki earthquake and tsunami, an anomalous event on the seafloor consistent with a turbidity current was recorded by ocean-bottom pressure recorders and seismometers deployed off Sendai, Japan. Freshly emplaced turbidites were collected from a wide area of seafloor off the Tohoku coastal region. We analyzed these measurements and sedimentary records to determine conditions of the modern tsunamigenic turbidity current. We anticipate our discovery to be a starting point for more detailed characterization of modern tsunamigenic turbidites, and for the identification of tsunamigenic turbidites in geologic records.

引用

页码：1195 / 1198

页数：4

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