Crustal structure across the coseismic rupture zone of the 1944 Tonankai earthquake, the central Nankai Trough seismogenic zone

2002 ◽  
Vol 107 (B1) ◽  
pp. EPM 2-1-EPM 2-21 ◽  
Author(s):  
Ayako Nakanishi ◽  
Narumi Takahashi ◽  
Jin-Oh Park ◽  
Seiichi Miura ◽  
Shuichi Kodaira ◽  
...  
Keyword(s):  
Crustal Structure ◽  
Nankai Trough ◽  
Rupture Zone ◽  
Seismogenic Zone ◽  
Tonankai Earthquake

scholarly journals Correction to “Crustal structure across the coseismic rupture zone of the 1944 Tonankai earthquake, the central Nankai Trough seismogenic zone”

2003 ◽  
Vol 108 (B7) ◽  
Author(s):  
Ayako Nakanishi ◽  
Jin-Oh Park ◽  
Seiichi Miura ◽  
Shuichi Kodaira ◽  
Yoshiyuki Kaneda ◽  
...  
Keyword(s):  
Crustal Structure ◽  
Nankai Trough ◽  
Rupture Zone ◽  
Seismogenic Zone ◽  
Tonankai Earthquake

Crustal structure around the eastern end of coseismic rupture zone of the 1944 Tonankai earthquake

2002 ◽  
Vol 354 (3-4) ◽  
pp. 257-275 ◽  
Author(s):  
Ayako Nakanishi ◽  
Hajime Shiobara ◽  
Ryota Hino ◽  
Junzo Kasahara ◽  
Kiyoshi Suyehiro ◽  
...  
Keyword(s):  
Crustal Structure ◽  
Rupture Zone ◽  
Tonankai Earthquake

Dense Ocean Floor Network for Earthquakes and Tsunamis (DONET) Around the Nankai Trough Mega Thrust Earthquake Seismogenic Zone in Southwestern Japan—Part 2: Real Time Monitoring of the Seismogenic Zone

2009 ◽  
Author(s):  
Yoshiyuki Kaneda ◽  
Katsuyoshi Kawaguchi ◽  
Eiichiro Araki ◽  
Hiroyuki Matsumoto ◽  
Takeshi Nakamura ◽  
...  
Keyword(s):  
Nankai Trough ◽  
Ocean Floor ◽  
Observational Research ◽  
Seismogenic Zone ◽  
Network System ◽  
Broadband Seismometer ◽  
Earthquake Research ◽  
Main Index ◽  
Tonankai Earthquake ◽  
Structural Research

The Nankai Trough is well known as the mega thrust earthquake generating tsunamis, with the interval of 100–200 years. The 1944 Tonankai and the 1946 Nankai earthquakes around the Nankai trough, each hypocenter was located off the Kii peninsula. However, according to Prof. Okamura of KOCHI University, super mega thrust earthquakes such as Hoei earthquake (1707) and Hakuho earthquakes (684) are occurring with an interval of 300–400 years or 700 years. Based on structural research, observational research and simulation researches, we proposed and have been starting to deploy the dense ocean floor observatory network system around the Tonankai seismogenic zone, to monitor crustal activities using broadband seismometer, accelerometer and precise pressure gauges. The probability of next Tonankai earthquake recurrence is estimate as 60–70% (The Headquarters for Earthquake Research Promotion; http://www.jishin.go.jp/main/index-e.html). Therefore, the ocean floor network is significant ant important to monitor the crustal activities around mega-thrust earthquakes. In this paper, we explain the recent and detailed developing of this oceanfloor network system (DONET). Especially, the installation of sensors and improvement of ROV for the deploying system in the deep seafloor will be developed. Furthermore, the new project including observation simulation and mitigation researches of mega thrust earthquakes around the Nankai trough is starting as 5 years project (2008–20012). Especially, the Ocean floor network data is very important and powerful to progress the new project.

scholarly journals Workshop explores seismogenic zone drilling in the Nankai trough

Eos ◽  
2001 ◽  
Vol 82 (45) ◽  
pp. 532-532
Author(s):  
A. Taira ◽  
G. Moore ◽  
H. Tobin ◽  
G. Kimura ◽  
S. Kodaira
Keyword(s):  
Nankai Trough ◽  
Seismogenic Zone

scholarly journals Seismogenic Zone Structures Revealed by Improved 3‐D Seismic Images in the Nankai Trough off Kumano

2019 ◽  
Author(s):  
Kazuya Shiraishi ◽  
Gregory F. Moore ◽  
Yasuhiro Yamada ◽  
Masataka Kinoshita ◽  
Yoshinori Sanada ◽  
...  
Keyword(s):  
Nankai Trough ◽  
Seismogenic Zone ◽  
Seismic Images

scholarly journals Western Nankai Trough seismogenic zone: Results from a wide-angle ocean bottom seismic survey

2000 ◽  
Vol 105 (B3) ◽  
pp. 5887-5905 ◽  
Author(s):  
Shuichi Kodaira ◽  
Narumi Takahashi ◽  
Jin-Oh Park ◽  
Kimihiro Mochizuki ◽  
Masanao Shinohara ◽  
...  
Keyword(s):  
Nankai Trough ◽  
Seismic Survey ◽  
Seismogenic Zone ◽  
Ocean Bottom ◽  
Wide Angle

Effect of Drill-Ship Motions on Core Sample Conditions During the Nankai Trough Seismogenic Zone Experiment

2009 ◽  
Author(s):  
Yuichi Shinmoto ◽  
Kazuyasu Wada
Keyword(s):  
Deep Sea ◽  
Nankai Trough ◽  
Drill String ◽  
Seismogenic Zone ◽  
Ship Motions ◽  
Scientific Drilling ◽  
Core Samples ◽  
Core Recovery ◽  
Drilling Parameters ◽  
Core Conditions

The Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) Stage 1A, which is a part of the Integrated Ocean Drilling Program (IODP), is a series of expeditions in scientific drilling and coring operations aboard the first riser-equipped deep sea drilling vessel, Chikyu. The objectives are to recover good quality core samples and collect data on undersea properties and drilling conditions, which will also provide valuable information for future expeditions. The coring operations were carried out under harsh drilling and ocean conditions so that core recovery was inconsistent and fluctuated from high to low. Moreover, differences in independent lithology, depth, and the type of coring tools from previous expeditions made it necessary to analyze and optimize drilling parameters with new data. A serious concern in retrieving core samples was the vertical heave motions caused by the drill-ship since the active heave compensator system could not be activated before operations due to the extreme deep sea conditions and only the passive heave compensator was used. The drill string and coring tools are particularly vulnerable to the high heaving movements of the vessel so that the core recovery rate and quality are also adversely affected. The present work presents an analysis of geotechnical information, drilling parameters and the drill-ship motions the NanTroSEIZE expedition in order to optimize core conditions and maintain high core recovery.

Deep crustal structure of the eastern Nankai Trough and Zenisu Ridge by dense airgun–OBS seismic profiling

2002 ◽  
Vol 187 (1-2) ◽  
pp. 47-62 ◽  
Author(s):  
Ayako Nakanishi ◽  
Hajime Shiobara ◽  
Ryota Hino ◽  
Kimihiro Mochizuki ◽  
Toshinori Sato ◽  
...  
Keyword(s):  
Crustal Structure ◽  
Nankai Trough ◽  
Seismic Profiling ◽  
Deep Crustal Structure
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