Preparations for the Coming Large Earthquakes at the Nankai Trough. Recurrence Interval of Large Earthquakes Along the Eastern Nankai Trough Inferred from Deep-sea Turbidites.

2001 ◽  
Vol 110 (4) ◽  
pp. 471-478 ◽  
Author(s):  
Ken IKEHARA
Keyword(s):  
Deep Sea ◽  
Nankai Trough ◽  
Recurrence Interval ◽  
Large Earthquakes

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.

scholarly journals Preparations for the Coming Large Earthquakes at the Nankai Trough. AVO Analysis Along the Nankai Trough Decollement.

2001 ◽  
Vol 110 (4) ◽  
pp. 510-520 ◽  
Author(s):  
Jin-Oh PARK ◽  
Tetsuro TSURU ◽  
Takashi HAMAJIMA ◽  
Yoshiyuki KANEDA ◽  
Asahiko TAIRA ◽  
...  
Keyword(s):  
Nankai Trough ◽  
Avo Analysis ◽  
Large Earthquakes
Sign in / Sign up

Export Citation Format

Share Document