Riserless Vertical Drilling Operations using Downhole Motors in the Nankai-Trough Seismogenic Zone

2011 ◽  
Author(s):  
Yuichi Shinmoto ◽  
Yukari Kido ◽  
Kazuyasu Wada
Keyword(s):  
Nankai Trough ◽  
Seismogenic Zone ◽  
Drilling Operations

Scientific Drilling Program of Drilling Vessel Chikyu and Drilling Data Acquisition for Future Technical Development

2011 ◽  
Author(s):  
Tomoya Inoue ◽  
Kazuyasu Wada ◽  
Eigo Miyazaki ◽  
Tsuyoshi Miyazaki
Keyword(s):  
Data Acquisition ◽  
Subduction Zones ◽  
Large Scale ◽  
Nankai Trough ◽  
Technical Development ◽  
Seismogenic Zone ◽  
Validity Data ◽  
Scientific Drilling ◽  
Drilling Data ◽  
Drilling Operations

The scientific drilling vessel Chikyu has started drilling at Nankai trough under the international organization, IODP. The Nankai trough located beneath the ocean off the southwest coast of Japan is one of the most active earthquake zones on the planet and one of the best-studied subduction zones as well. The Nankai Trough Seismogenic Zone Experiment attempts for the first time to drill, sample, and instrument the earthquake-causing or the seismogenic portion of Earth’s crust, where violent, large-scale earthquakes have occurred repeatedly throughout history. Before starting the international drilling operations, an integration drilling test off Shimokita Peninsula was conducted and we acquired actual drilling data such as vessel heave, hook load, and compensator position. Confirming its validity, data acquisition systems have worked continuously in international drilling operations. It is very important to consider the actual drilling data for the drilling operation and for further technical development. This paper describes the scientific drilling programs of the drilling vessel Chikyu and the drilling data acquisition for future technical development in relation with the sample data acquired in the internal drilling operations.

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.

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 The IODP Expedition 332 : Eyes on the Prism, The NanTroSEIZE Observatories

2012 ◽  
Vol 14 ◽  
pp. 34-38 ◽  
Author(s):  
S. T. Toczko ◽  
A. J. Kopf ◽  
E. Araki ◽  
Keyword(s):  
Nankai Trough ◽  
Temperature Data ◽  
Seismogenic Zone ◽  
Plate Boundaries ◽  
Transient Pressure ◽  
Ocean Drilling Program ◽  
Ocean Drilling ◽  
Integrated Ocean Drilling Program ◽  
Drilling Project

The Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) is a major long-term drilling project designed to investigate the seismogenic behavior of subduction zone plate boundaries. Integrated Ocean Drilling Program (IODP) Expedition 332 deployed a long-term borehole monitoring system (LTBMS), an advanced Circulation Obviation Retrofit Kit (CORK)-type observatory. The recovery of pressure and temperature data from a temporary observatory (SmartPlug) deployed during IODP Expedition 319 helped prove the SmartPlug concept. The permanent LTBMS was deployed n the upper 1000 m of Site C0002, while the SmartPlug was recovered from Site C0010 and replaced with a more capable "GeniusPlug", incorporating an extension with a geochem-ical sampler and biological experiment to the original SmartPlug design. SmartPlug pressure and temperature data showed signs of transient pressure events. <br><br> doi:<a href="http://dx.doi.org/10.2204/iodp.sd.14.04.2012" target="_blank">10.2204/iodp.sd.14.04.2012</a>

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

2008 ◽  
Author(s):  
Yoshiyuki Kaneda ◽  
Katsuyoshi Kawaguchi ◽  
Eiichiro Araki ◽  
Hiroyuki Matsumoto ◽  
Takeshi Nakamura ◽  
...  
Keyword(s):  
Real Time ◽  
Nankai Trough ◽  
Ocean Floor ◽  
Seismogenic Zone ◽  
Network System ◽  
Real Time Monitoring ◽  
Broadband Seismometer ◽  
Kii Peninsula

The Nankai Trough is well known as the mega thrust earthquake generating tsunamis, with the interval of 100–150 years. The 1944 Tonankai and the 1946 Nankai earthquakes around the Nankai trough, each hypocenter was located off the Kii peninsula. Based on structural 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 ocean floor network is significant ant important to monitor the crustal activities around mega-thrust earthquakes.

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