scholarly journals Seismicity quiescence and activation in western Japan associated with the 1944 and 1946 great earthquakes near the Nankai trough

2004 ◽  
Vol 109 (B4) ◽  
Author(s):  
Yosihiko Ogata
Keyword(s):  
Nankai Trough ◽  
Great Earthquakes ◽  
Western Japan

scholarly journals Correction to: Geological record of prehistoric tsunamis in Mugi town, facing the Nankai Trough, western Japan

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Yumi Shimada ◽  
Shigehiro Fujino ◽  
Yuki Sawai ◽  
Koichiro Tanigawa ◽  
Dan Matsumoto ◽  
...  
Keyword(s):  
Nankai Trough ◽  
Geological Record ◽  
Western Japan

scholarly journals Amplification of tsunami heights by delayed rupture of great earthquakes along the Nankai trough

2010 ◽  
Vol 62 (4) ◽  
pp. 427-432 ◽  
Author(s):  
Kentaro Imai ◽  
Kenji Satake ◽  
Takashi Furumura
Keyword(s):  
Nankai Trough ◽  
Great Earthquakes ◽  
Delayed Rupture

scholarly journals The impact of Tsunamis on land appraisals: Evidence from Western Japan

PLoS ONE ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. e0248860
Author(s):  
Yasuhiro Sato ◽  
Keita Shiba
Keyword(s):  
Nankai Trough ◽  
High Elevation ◽  
Great East Japan Earthquake ◽  
Land Prices ◽  
Western Japan ◽  
The Impact

This paper estimates the impact of the tsunami caused by the Great East Japan earthquake on land appraisals of various locations outside of directly damaged areas. The focus is on locations that are expected to be extensively damaged by a tsunami if the Nankai Trough earthquake occurs. We use the DID and DDD approaches and show that locations with low elevation and close to the sea experienced decreases in appraised land prices compared to locations with high elevation and far from the sea. Especially, locations with less than 3.6m elevation and within 1.46km of the coastline experienced significant decreases in appraised land prices. This result implies that people have changed their location preferences regarding elevation and distance from the sea.

Tsunami scenarios for megathrust earthquakes: mechanics of multi-segment ruptures and elastic-fluid dynamics of wave propagation

2020 ◽  
Author(s):  
Tatsuhiko Saito ◽  
Akemi Noda
Keyword(s):  
Fluid Dynamics ◽  
Strain Energy ◽  
Seismic Waves ◽  
Nankai Trough ◽  
Ocean Bottom ◽  
Bottom Pressure ◽  
Ocean Bottom Pressure ◽  
Megathrust Earthquakes ◽  
Great Earthquakes ◽  
Pressure Changes

<p>Great earthquakes repeatedly occurred with different rupture processes in the Nankai trough, southwestern Japan. The 1944 Tonankai and the 1946 Nankai earthquakes (M ~8) caused serious tsunami damage over many areas along the coastline. The greatest earthquake in this region is the 1707 Hoei earthquake (M 8.4) that is believed to have ruptured the whole region (~600 km) of the Nankai Trough. The purpose of this study is to theoretically assess the tsunami height along the coasts excited by great earthquakes that can possibly occur in future in this region and simulate observable tsunami records during the earthquakes.</p><p>This study employed a new method for making various rupture scenarios. Based on a shear-stress distribution along the plate boundary estimated by the GNSS data analyses (Noda et al. 2018 JGR), we calculated coseismic slip distributions to release the accumulated stress for possible multi-segment rupture scenarios. Then, we used the strain energy released by the rupture to evaluate the possibility of each event. The released strain energy should be larger than the energy dissipated on the fault. However, for some scenarios, the released strain energy was smaller than the dissipated energy under the assumptions of friction laws. Such rupture scenarios are not likely to occur in the viewpoint of earthquake mechanics. This approach can provide necessary conditions of the strain energy or the accumulated stress levels for multi-segment rupture processes, while methods based on empirical or kinematic approaches do not treat stress or interseimsmic stress-accumulation periods required for ruptures.</p><p>Another distinctive point in our approach is that we theoretically synthesize ocean-bottom pressure changes caused by both seismic waves and tsunamis using a simulation method based on elastic and fluid dynamics (Saito and Tsushima 2016 JGR; Saito et al. 2019 Tectonophysics). Seismic wave contributions to ocean-bottom pressure changes are critically important for the synthetics in near-field or inside rupture areas because the seismic waves overlap with tsunami signals and work as noise for real-time tsunami monitoring. The records simulated in this study can be used to examine the monitoring ability of a deep-ocean observation network for megathrust earthquakes and tsunamis in this region.</p>

Characteristics and Mitigation Measures for Tsunamis Generated Along the Nankai Trough

2009 ◽  
Vol 4 (2) ◽  
pp. 127-134 ◽  
Author(s):  
Fumihiko Imamura ◽  
◽  
Kentaro Imai ◽  
Keyword(s):  
Nankai Trough ◽  
Wide Area ◽  
Mitigation Measures ◽  
Historical Information ◽  
Strong Current ◽  
Western Japan

Historical information related to tsunamis generated in the Nankai Trough was compiled to examine their frequency and associated destruction. Types of damage in a wide area throughout western Japan from Boso to Kyushu, Susaki, Kochi, and Osaka were selected to elucidate tsunami behavior and damage to areas where multiple damage to facilities was reported, such as that to floated ships, bridge destruction, and road blockage by strong current and floating materials such as destroyed house and ships. After reviewing the tsunami physics and damage from recent events including that related to 2004 Sumatra, suggestions are offered to mitigate future disasters.

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