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

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Title:	Stress field observation and modeling from the NanTroSEIZE scientific drillings in the Nankai Trough system, SW Japan
Authors:	詹忠翰;Wu, Hung-Yu;Chan, Chung-Han;Kinoshita, Masataka;Saito, Saneatsu
Contributors:	地球科學學院地球科學學系
Keywords:	Boreholes;Borings;Breakout;Data processing;Downhole logging;Earthquakes;Logging;Nankai Trough;NanTroSEIZE;Optimally oriented planes;Orientation;Seismic phenomena;Stress polygon;Stresses
Date:	2013-07-17
Issue Date:	2026-04-23 11:46:39 (UTC+8)
Publisher:	Elsevier;Elsevier B.V
Abstract:	摘要： 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. •We demonstrate in-situ observations within the drill sites of NanTROSEIZE.•We model the stress state according to different slip models.•Modeled stress states are compared with in-situ observations.•The modeled stress states could more or less explain logging data. 出版者： Elsevier B.V 出版日期： 2013-07-01 出處： Tectonophysics, 2013-07, Vol.600, p.99-107 資源來源： ScienceDirect (Elsevier) Journals 版權： 2013 識別號： ISSN: 0040-1951 識別號： EISSN: 1879-3266 識別號： DOI: 10.1016/j.tecto.2013.04.009
Appears in Collections:	[Department of Earth Sciences ] journal & Dissertation

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