New aspects of tectonic stress inversion with reference to the TENSOR program

Author:

Delvaux D.12,Sperner B.3

Affiliation:

1. Royal Museum for Central Africa, Department of Geology-Mineralogy B-3080 Tervuren, Belgium damien.delvaux@skynet.be

2. Vrije University Amsterdam, The Netherlands

3. Geophysical Institute, Karlsruhe University Hertzstrasse 16, 76187 Karlsruhe, Germany

Abstract

AbstractAnalysis of tectonic stress from the inversion of fault kinematic and earthquake focal mechanism data is routinely done using a wide variety of direct inversion, iterative and grid search methods. This paper discusses important aspects and new developments of the stress inversion methodology as the critical evaluation and interpretation of the results. The problems of data selection and separation into subsets, choice of optimization function, and the use of non-fault structural elements in stress inversion (tension, shear and compression fractures) are examined. The classical Right Dihedron method is developed in order to estimate the stress ratio R, widen its applicability to compression and tension fractures, and provide a compatibility test for data selection and separation. A new Rotational Optimization procedure for interactive kinematic data separation of fault-slip and focal mechanism data and progressive stress tensor optimization is presented. The quality assessment procedure defined for the World Stress Map project is extended in order to take into account the diversity of orientations of structural data used in the inversion. The range of stress regimes is expressed by a stress regime index R’, useful for regional comparisons and mapping. All these aspects have been implemented in a computer program TENSOR, which is introduced briefly. The procedures for determination of stress tensor using these new aspects are described using natural sets of fault-slip and focal mechanism data from the Baikal Rift Zone.

Publisher

Geological Society of London

Subject

Geology,Ocean Engineering,Water Science and Technology

Reference50 articles.

1. From orientation to magnitudes in paleostress determinations using fault slip data

2. Inversion directe et recherche 4-D: comparaison physique et mathématique de deux méthodes de détermination des tenseurs des paléocontraintes en tectonique de failles;Angelier;Comptes Rendus de l’Académie des Sciences de Paris,1991

3. Angelier J. (1994) in Continental Deformation, Fault slip analysis and paleostress reconstruction, ed Hancock P. L. (Pergamon, Oxford), pp 101–120.

4. Sur une méthode graphique de recherche des contraintes principales également utilisable en tectonique et en seismologie : la méthode des dièdres droits;Angelier;Bulletin de la Société Géologique de France,1977

5. The Mechanics of Oblique Slip Faulting

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3