共线不连通断层标本变形过程中群体微破裂事件的时空演化

地震 ›› 2003, Vol. 23 ›› Issue (3): 1-9.

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共线不连通断层标本变形过程中群体微破裂事件的时空演化

蒋海昆^1,3, 马胜利^2,3, 张流^2,3, 曹文海¹, 侯海峰¹, 冯志军¹

1.山东省地震局, 山东济南 250014;
2.中国地震局地质研究所, 北京 100029;
3.中国地震局构造物理开放实验室, 北京 100029

收稿日期:2002-10-15 修回日期:2003-01-20 出版日期:2003-07-31 发布日期:2021-12-21
作者简介:蒋海昆(1964-), 男, 云南通海人, 2000 年获博士学位, 研究员, 主要从事地震预测、震源震兆物理实验及理论研究。
基金资助:
“ 十五” 国家科技攻关项目(2001BA601B01-04-01); 地震联合基金项目(102037)

AE spatio-temporal evolution distribution during the deformation of rock sample contained a collinear fault with an unconnected area

JIANG Hai-kun^1,3, MA Sheng-li^2,3, ZHANG Liu^2,3, HOU Hi-feng¹, FENG Zhi-jun¹

1. Seismological Bureau of Shandong Province, Jinan 250014, China;
2. Institute of Geology, CSB, Beijing 100029, China;
3. Laboratory of tectonophysics, CSB, Beijing 100029, China

Received:2002-10-15 Revised:2003-01-20 Online:2003-07-31 Published:2021-12-21

摘要/Abstract

摘要： 设计了共线不连通断层物理模型, 在概念上可模拟与地震孕育相关的障碍体或强固区。开展了中等尺度辉长岩标本的双轴破裂实验, 对4600 余次微破裂事件进行了精确定位, 据此对共线不连通断层标本变形过程中群体微破裂事件时空演化的统计特征进行初步研究。由于强闭锁作用, 变形过程中在98%的峰值强度, 以前围绕不连通区域显示一系列在时间上依次递进、空间上逐步收缩、长轴方向随之改变的“ 空区”演化图像。在峰值强度后的弱化阶段, 较大的声发射事件在被动盘明显丛集, 而主动盘则小AE 事件呈弥散性分布。与弹性变形阶段相比, 弱化阶段AE 主体活动区域从主动盘迁移至被动盘, 并且AE 较大事件次数明显增多、应变能释放急剧增加, 声发射率在不连通区域破裂前的瞬间达到最高值。b 值在不连通区域破裂失稳前显示“ 趋势性降低— 快速回升”这一典型变化过程。对比研究还表明, 破裂型失稳较粘滑型失稳具有更为明显、丰富的微破裂前兆。

关键词: 声发射, 共线不连通断层标本, 差应力, 微破裂时空演化, 破裂,粘滑

Abstract: A physical model for collinear fault with an unconnected area has been designed and con-ceptually been used to simulate the barrier or strong area concerning the earthqua ke preparation. Biaxi-al compressional experiments on middle -size rock sample w ith this model have been done and more than4600 A E events have been located accurately. Farther more, the statistical characteristics of A E spatio-temporal distribution h ave been studied preliminarily. Due to the influence of strong locked area, it re-veals a clear evolvement process of gaps around the unconnected area before the 98% of peak strength,which gradually develops in time and contracts in space. During the w eakening stage after the peakstrength, larger AE events are crowded together in passive lower wall and smaller A E events distributeddispersively in active hanging wall. Comparing with the elastic stage, the main aea of AE activity mi-grated from active hanging wall to the passive lower wall during the weakening stage. And the frequen-cy of larger AE events and the AE releasing strain energy increased obv iously during the weakeningstage. The A ER reached the highest value at the moment before the fracture of unconnected area. Thevariation of b values reviewed a typical feature that b value reduced gradually in the prophase for along time, and then rises back quickly before the instability. Results also show that the fracture insta-bility has more evident and more abundant microfracture precursors than that of stick -slip.

Key words: Acoustic emission, Rock sample for collinear fault with an unconnected area, Differential stress, Spatio-temporal evolvement of AE

中图分类号:

P315.3

蒋海昆, 马胜利, 张流, 曹文海, 侯海峰, 冯志军. 共线不连通断层标本变形过程中群体微破裂事件的时空演化[J]. 地震, 2003, 23(3): 1-9.

JIANG Hai-kun, MA Sheng-li, ZHANG Liu, HOU Hi-feng, FENG Zhi-jun. AE spatio-temporal evolution distribution during the deformation of rock sample contained a collinear fault with an unconnected area[J]. EARTHQUAKE, 2003, 23(3): 1-9.

参考文献

[1] Mogi K.Seismic activity and earthquake prediction[M].In:Proceeding of the Symposium on Earthquake Prediction Research, 1977.203-214.
[2] Brune J N.Implications of earthquake triggering and rupture propagation for earthquake prediction based on premonitory phenomena[J].J Geophys Res, 1979, 84:2195-2198.
[3] Jones L M, Molnar P.Some characteristics of foreshocks and their possible relationship to earthquake prediction and premonitory slip on faults[J].J Geophys Res, 1979, 84:3596-3608.
[4] Kanamori H.The nature of seismicity patterns before large earthquake[M].Earthquake Prediction-an international review (eds.Simpson D W and Richards P G).Maurice Ewing Series(AGU 4), 1981.1-19.
[5] 梅世蓉.地震前兆场物理模式与前兆时空分布机制研究(一) 坚固体孕震模式的由来与证据[J].地震学报, 1995, 17(3):273-283.
[6] 郭增建, 秦保燕.地震成因与地震预报[M].北京:地震出版社, 1991.220-223.
[7] 马瑾, 张渤涛, 许秀琴, 等.断层交汇区附近的变形特点与声发射特点的实验研究[J].地震学报, 1983, 5(2):195-206.
[8] 马瑾, 马文涛, 马胜利, 等.5°拐折构造变形物理场的实验研究与数值模拟[J].地震地质, 1985, 17(4):318-326.
[9] 许昭永, 王彬, 赵晋明, 等.含硬包体试样破裂特征的实验研究[J].地震学报, 1997, 19(1):79-85.
[10] 蒋海昆, 张流, 周永胜.室温及不同围压条件下AE 序列特征及其地震学意义[J].地球物理学报, 2000, 43(6):812-826.
[11] 蒋海昆.典型断层组合及不同温压条件下岩石变形过程中的声发射特征[D].北京:中国地震局地质研究所, 2000.
[12] 蒋海昆, 张流, 王琦.声发射三维定位及波速反演— 理论方法、数值实验和误差分析[J].地震, 1999, 19(3):245-252.
[13] 陆远忠, 陈章立, 王碧泉, 等.地震预报的地震学方法[M].北京:地震出版社, 1985.91-94.
[14] 蒋海昆, 张流.岩石微破裂时空分布特征及其动态演化过程的声发射研究进展[J].世界地震译丛, 1998 (5):1-10.
[15] 蒋海昆, 张流, 周永胜.温度环境对花岗岩变形破坏过程中声发射序列特征的影响[J].地震, 2000, 20(2):87-94.
[16] 蒋海昆, 张流, 周永胜.不同深度温压条件下花岗岩变形破坏过程中的AE 序列特征[J].地震学报, 2000, 22(4):395-403.
[17] 蒋海昆, 马胜利, 张流, 等.雁列式断层组合变形过程中的声发射活动特征[J].地震学报, 2002, 24(4):385-396.

共线不连通断层标本变形过程中群体微破裂事件的时空演化

AE spatio-temporal evolution distribution during the deformation of rock sample contained a collinear fault with an unconnected area

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