中上地壳应变分配模型及其地震学研究意义

地震 ›› 2000, Vol. 20 ›› Issue (z1): 58-64.

中上地壳应变分配模型及其地震学研究意义

申旭辉, 田勤俭, 韦开波, 陈正位

中国地震局分析预报中心 ,北京 100036

收稿日期:2000-05-29 修回日期:2000-06-15 出版日期:2000-09-30 发布日期:2022-09-23
作者简介:申旭辉 (1965-), 男, 湖南衡阳人, 1996年获博士学位 ,副研究员 ,主要从事新构造、工程地震及地震中长期预测研究。
基金资助:
国家自然科学基金项目 (49732090); 地震科学联合基金项目 (95-07-422); 国家重点基础研究发展规划项目 (95-13-01-02)资助

Strain partitioning model in the middle-upper crust and its application to seismic research

SHEN Xu-hui, TIAN Qin-jian, WEI Kai-bo, CHEN Zheng-wei

Center for Analysis and Prediction, CSB, Beijing 100036, China

Received:2000-05-29 Revised:2000-06-15 Online:2000-09-30 Published:2022-09-23

摘要/Abstract

摘要： 应变分配 (Str ain Pa rtitio ning)作为一种基本应变形式, 即下地壳和岩石圈地幔内的斜向应变在中上地壳内解藕为相互独立的一个正应变分量和一个剪应变分量的现象。在平面上表现为平行排列、同时活动的走滑断裂系统和相应的正应变构造型式。应变分配是一种极为普遍的构造现象。应变分配的发生主要受主断面倾角、与主应力轴交角、区域应力场状态以及构造带结构和物质组成的影响。作为断层相互作用的一种主要模型 ,应变分配模型的最直接证据来源于地震学方面, 包括震源机制、震源深度及其分区特征等的研究结果。反过来, 应变分配模型的建立 ,将在确定震源体的独立性、判断震源发震能力、判断地震序列特征、确定地震发展趋势方面为地震科学研究尤其是地震中长期危险性预测研究提供进一步的理论依据。

关键词: 断层相互作用, 应变分配, 解藕, 地震, 活动构造带

Abstract: Strain partitioning is the phenomenon that the oblique strain in the low ercrust and li thospheric mantle is partitioned into near pure tangential and normal strain in the middle-upper crust, strain partitioning is expressed as an active thrust-parallel strike-slip faulting.There're 4 or 5 parameters influencing strain partitionin g:dip of faults, convergence obliquity, coupling condition or stress field, strength of overriding block etc. Being a main model on fault-interaction, strain-partitioning model is directly supported by seismic data, such as focal mechanism, focal depth and their zonation. On the other hand, a reasonable strain-partitioning model will be helpful to evaluate the independence and potentiality of earthquake source, to determine seismic sequence and seismic tendency.

Key words: Fault-interaction, Strain partitioning, Decoupling, Active tectonic zone

中图分类号:

申旭辉, 田勤俭, 韦开波, 陈正位. 中上地壳应变分配模型及其地震学研究意义[J]. 地震, 2000, 20(z1): 58-64.

SHEN Xu-hui, TIAN Qin-jian, WEI Kai-bo, CHEN Zheng-wei. Strain partitioning model in the middle-upper crust and its application to seismic research[J]. EARTHQUAKE, 2000, 20(z1): 58-64.

参考文献

[1] Wilcox R E, Harding T P, Seely D R. Ba sic wrench tectonics [J]. A A PG Bull, 1973, 57: 74-96.
[2] Fitch J L.Plate convergence transcurrent faults and internal deformation adjacent to southeast Asia and the w ester n Pacific [J]. J Geo phy s Res, 1972, 77, 4432-4460.
[3] William R, Lettis K, Athryn L.Crustal strain partitioning: Implications for seismic-hazard assessment in western California [J]. Geo logy, 1991, 19: 559-562.
[4] Woodcock N H, The role of strike-slip fault systems at plate boundaries [J]. Philos Tra ns R Soc, London Ser A, 1986, 317: 13-19.
[5] Ellis M A.Structural morphology and associated strain in the central Cordillera: Evidence of oblique tectonics [J]. Geo log y, 1986, 14: 647-650.
[6] Donna K.Strain partitioning and progressive deformation history in a transpressive belt northern Appalachians [J]. Tectono physics, 1995, 241: 15-34.
[7] Keppie D, Dallmeyer R D.Dating transcurrent terrane accretion: Anexample from the Megura and Avalon compo site terranes in the northern Appa lachians [J]. Tectonics, 1988, 6: 931-947.
[8] Susan M, Cashman Harv ey M, Kelsey Craig F, et al . Strain partitioning between structural do mains in the forearc of the Hikurangi subduc to nzone New Zealand [J]. Tectonics, 1992, 11(2) 242-257.
[9] Bralower T J, Hutsun F, Mann P, et al. Tectonics of o blique arc-continent collision in western Cuba 1 Stratigraphic constraint [J]. EO S Trans Am Geophys Unio n, 1993, 74: 546.
[10] Hans G, Av e L. Transpression displacement partitioning, and exhumation in the eastern Caribbean / South American plate boundary zone [J]. Tectonics, 1997, 16(2): 272-289.
[11] Wesnousky S G, Jones C H .Oblique slip, slip partitioning, spatial and temporal changes in the regional stress field, and the relativestrength of active faults in the Basin and Rande, westeren United States [J]. Geology, 1994, 22: 1031-1034.
[12] Gaudemer Y, Tapponnier P, M eye r B P, et al . Partitioning of crustal slip between linked, active faults in the eastern Qilian Shan, and evidence for amajor seismic gap, the 'Tianzhugap ', on the western Haiyuan Fault, Gansu (China) [J]. Geophys J Int, 1995, 120: 599-645.
[13] Ha ns G, Av e L, Oldo w J S. Ear ly Meso zoic southward migration of Codilleran co mpressional ter ranes [J]. Tectonics, 1988, 7: 1057-1075.
[14] Beck M E, Jr C R, Cembrano J.On the nature of buttressing in margin-parallel strike-slip fault systems [J]. Geolog y, 1993, 21: 755-758.
[15] Jarrard R D.Terranemotio n by strike-slip faulting of fore-arc silvers [J]. Geolog y, 1986, 14: 780-783.
[16] 唐荣昌 .四川活动断裂与地震 [M]. 北京: 地震出版社, 1993.
[17] 张诚 .中国地震震源机制 [M]. 北京: 地震出版社, 1989.
[18] Benjamin M P, Thomas M B.Thrusting of the central California margin over the edge of the Pacific plate during the transform regime [J]. Geo logy, 1993, 21(7): 635-638.
[19] Mark D Z, Mary L Z, V an S M, et al. New evidence on the state of stress of the Sa n Andreas fault system [J]. Science, 1987: 1105-1111.
[20] Ekstrom G, Engdah l E R. Earthquake source parametes and stress distribution in the Adak island region of the centre Aleutian Inlands, Ala ska [J]. J Geophys Res, 1989, 94: 15499-15519.
[21] Hans G,Av e L. Dispalcement partitioning and arc-parallel extension in the Aleutian v olcanic inland arc [J]. T ectono physics. 1996, 256: 279-293.
[22] 丁国瑜 .中国内陆活动断裂基本特征的探讨 [A]. 中国地震学会地震地质专业委员会. 中国活动断裂[C]. 北京: 地震出版社, 1982. 1-9.