Stress field observation and modeling from the NanTroSEIZE scientific drillings in the Nankai Trough system, SW Japan

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doi: 10.1016/j.tecto.2013.04.009
Author(s): Wu, Hung-Yu; Chan, Chung-Han; Kinoshita, Masataka; Saito, Saneatsu
Author Affiliation(s): Primary:
Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
National Taiwan University, Taiwan
Volume Title: Great earthquakes along subduction zones
Volume Author(s): Kimura, Daku, editor; Brodsky, Emily; Di Toro, Giulio; Ide, Satoshi; Kanagawa, Kyuichi; Park, Jin-Oh; Underwood, Michael
Source: Great earthquakes along subduction zones, edited by Daku Kimura, Emily Brodsky, Giulio Di Toro, Satoshi Ide, Kyuichi Kanagawa, Jin-Oh Park and Michael Underwood. Tectonophysics, Vol.600, p.99-107. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0040-1951 CODEN: TCTOAM
Note: In English. 30 refs.; illus., incl. 3 tables, sketch maps
Summary: Many studies have investigated the stress state in terms of drilling projects in the Nankai Trough region, the potential area for next devastating earthquakes. To understand the stress state and the geologic properties in Nankai, several drilling projects have been conducted over time. Among these projects, the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) included studies regarding stress orientations and magnitude estimations by logging data from the Nankai Trough. Due to limitations in technology of drilling and the data processing, the actual stress orientation and the magnitude of the Nankai Trough at depth remains controversial. In this study, we discussed the stress state in each borehole and evaluated the stress state using various models. Our models evaluated stress states contributed by a slip deficit model in the Nankai Trough system and the coseismic dislocations of the two September 5th, 2004 earthquakes. Compared to the stress estimation from logging data, the simulated stress orientation could more or less explain the logging data at the NanTroSEIZE drilling boreholes. Based on these models, the stress tensor in Nankai can be extended from the boreholes to more dimensional area, even the locations where no drilling has been reached. Abstract Copyright (2013) Elsevier, B.V.
Year of Publication: 2013
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 16 Structural Geology; 20 Geophysics, Applied; Coseismic processes; Crust; Depth; Drilling; Earthquakes; Electrical methods; Expedition 319; Faults; Foliation; Gamma-ray methods; Geophysical methods; Geophysical surveys; IODP Site C0002; IODP Site C0006; IODP Site C0009; IODP Site C0011; Integrated Ocean Drilling Program; Kumano Basin; Marine sediments; Models; NanTroSEIZE; Nankai Trough; North Pacific; Northwest Pacific; Oceanic crust; Orientation; Pacific Ocean; Pore pressure; Resistivity; Sediments; Seismicity; Shikoku Basin; Stress fields; Surveys; Well-logging; West Pacific
Coordinates: N324900 N333000 E1365300 E1363200
Record ID: 2014001330
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands