Normal-faulting earthquakes beneath the outer slope of the Japan Trench after the 2011 Tohoku earthquake: Implications for the stress regime in the incoming Pacific plate

2012 ◽  
Vol 39 (7) ◽  
pp. n/a-n/a ◽  
Author(s):  
Koichiro Obana ◽  
Gou Fujie ◽  
Tsutomu Takahashi ◽  
Yojiro Yamamoto ◽  
Yasuyuki Nakamura ◽  
...  
Keyword(s):  
Tohoku Earthquake ◽  
Pacific Plate ◽  
2011 Tohoku Earthquake ◽  
Japan Trench ◽  
Normal Faulting ◽  
The 2011 Tohoku Earthquake ◽  
Stress Regime ◽  
Outer Slope

THE SEDIMENTARY AND ISOTOPIC SIGNATURE OF THE 2011 TOHOKU EARTHQUAKE AND TSUNAMI AND PRIOR EARTHQUAKES, JAPAN TRENCH

2019 ◽  
Author(s):  
McCain Moore ◽  
◽  
Cecilia M.G. McHugh ◽  
Leonardo Seeber ◽  
Kazuko Usami ◽  
...  
Keyword(s):  
Tohoku Earthquake ◽  
Isotopic Signature ◽  
2011 Tohoku Earthquake ◽  
Japan Trench ◽  
The 2011 Tohoku Earthquake

scholarly journals Spatio-temporal characteristics of frictional properties on the subducting Pacific Plate off the east of Tohoku district, Japan estimated from stress drops of small earthquakes

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Takuji Yamada ◽  
Meitong Duan ◽  
Jun Kawahara
Keyword(s):  
Stress Drop ◽  
Tohoku Earthquake ◽  
Pacific Plate ◽  
2011 Tohoku Earthquake ◽  
Plate Interface ◽  
The 2011 Tohoku Earthquake ◽  
Frictional Properties ◽  
Frictional Strength ◽  
Spatio Temporal ◽  
Stress Drops

AbstractThe east coast of the Tohoku district, Japan has a high seismicity, including aftershocks of the 2011 M9 Tohoku earthquake. We analyzed 1142 earthquakes with $$4.4 \le M_{W} \le 5.0$$ 4.4 ≤ M W ≤ 5.0 that occurred in 2003 through 2018 and obtained spatio-temporal pattern of stress drop on the Pacific Plate that subducts beneath the Okhotsk Plate. Here we show that small earthquakes at edges of a region with a large slip during the 2011 Tohoku earthquake had high values of stress drop, indicating that the areas had a high frictional strength and suppressed the coseismic slip of the 2011 Tohoku earthquake. In addition, stress drops of small earthquakes in some of the areas likely decreased after the 2011 Tohoku earthquake. This indicates that the frictional strength decreased at the areas due to the following aftershocks of the 2011 Tohoku earthquake, consistent with a high aftershock activity. This also supports that the frictional properties on a subducting plate interface can be monitored by stress drops of small earthquakes, as pointed out by some previous studies.

scholarly journals Spatio-temporal Characteristics of Frictional Properties on the Subducting Pacific Plate Off the East of Tohoku District, Japan Estimated from Stress Drops of Small Earthquakes

2020 ◽  
Author(s):  
Takuji Yamada ◽  
Meitong Duan ◽  
Jun Kawahara
Keyword(s):  
Stress Drop ◽  
Tohoku Earthquake ◽  
Pacific Plate ◽  
2011 Tohoku Earthquake ◽  
Plate Interface ◽  
The 2011 Tohoku Earthquake ◽  
Frictional Properties ◽  
Frictional Strength ◽  
Spatio Temporal ◽  
Stress Drops

Abstract The east coast of the Tohoku district, Japan has a high seismicity, including aftershocks of the 2011 M9 Tohoku earthquake. We analyzed 1142 earthquakes with $4.4 \le M_{W} \le 5.0$ that occurred in 2003 through 2018 and obtained spatio-temporal pattern of stress drop on the Pacific Plate that subducts beneath the Okhotsk Plate. Here we show that small earthquakes at edges of a region with a large slip during the 2011 Tohoku earthquake had high values of stress drop, indicating that the areas had a high frictional strength and suppressed the coseismic slip of the 2011 Tohoku earthquake. In addition, stress drops of small earthquakes in some of the areas likely decreased after the 2011 Tohoku earthquake. This indicates that the frictional strength decreased at the areas due to the following aftershocks of the 2011 Tohoku earthquake, consistent with a high aftershock activity. This also supports that the frictional properties on a subducting plate interface can be monitored by stress drops of small earthquakes, as pointed out by some previous studies.

High resilience of harpacticoid copepods in the landward slope of the Japan Trench against disturbance of the 2011 Tohoku Earthquake

2018 ◽  
Vol 63 (6) ◽  
pp. 2751-2761 ◽  
Author(s):  
Tomo Kitahashi ◽  
Robert G. Jenkins ◽  
Shigeaki Kojima ◽  
Motohiro Shimanaga
Keyword(s):  
Tohoku Earthquake ◽  
2011 Tohoku Earthquake ◽  
Japan Trench ◽  
The 2011 Tohoku Earthquake ◽  
Harpacticoid Copepods

Effect of the 2011 Tohoku Earthquake on deep-sea meiofaunal assemblages inhabiting the landward slope of the Japan Trench

2014 ◽  
Vol 358 ◽  
pp. 128-137 ◽  
Author(s):  
Tomo Kitahashi ◽  
Robert G. Jenkins ◽  
Hidetaka Nomaki ◽  
Motohiro Shimanaga ◽  
Katsunori Fujikura ◽  
...  
Keyword(s):  
Deep Sea ◽  
Tohoku Earthquake ◽  
2011 Tohoku Earthquake ◽  
Japan Trench ◽  
The 2011 Tohoku Earthquake
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