沂沭活断层北段F＿1断层滑动方式的讨论   总被引：5，自引：2，他引：5       下载免费PDF全文

杨一冲  高维明 《地震地质》1994,16(1):12-20

通过野外调查和室内分析，并结合对比南段全新世粘滑破裂的特征，对沂沭活断层北段Ｆ＿１的滑动方式进行了讨论。断层泥ＳＥＭ的判别结果表明，晚更新世（Ｑ＿３）以前，北段Ｆ＿１以强烈的粘滑错动为主，而宏观调查及断层泥粘土矿物的分析显示出断层自晚更新世中晚期以来，其滑动方式可能由粘滑向蠕滑转变。结合年代学的研究，初步认为其转变时代为距今５万ａ左右。该结论对沂沭断裂带及其附近地区的地震预报及工程建设均具有实际意义和参考价值  相似文献   

Earthquake mechanism and predictability shown by a laboratory fault     

Chi-Yu King 《Pure and Applied Geophysics》1994,143(1-3):457-482

Slip events generated in a laboratory fault model consisting of a circulinear chain of eight spring-connected blocks of approximately equal weight elastically driven to slide on a frictional surface are studied. It is found that most of the input strain energy is released by a relatively few large events, which are approximately time predictable. A large event tends to roughen stress distribution along the fault, whereas the subsequent smaller events tend to smooth the stress distribution and prepare a condition of simultaneous criticality for the occurrence of the next large event. The frequency-size distribution resembles the Gutenberg-Richter relation for earthquakes, except for a falloff for the largest events due to the finite energy-storage capacity of the fault system. Slip distributions, in different events are commonly dissimilar. Stress drop, slip velocity, and rupture velocity all tend to increase with event size. Rupture-initiation locations are usually not close to the maximum-slip locations.  相似文献   

Focal mechanisms of large earthquakes in the North Island of New Zealand: slip partitioning at an oblique active margin   总被引：1，自引：0，他引：1  

Terry H. Webb  & Helen Anderson 《Geophysical Journal International》1998,134(1):40-86

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岩石破碎理论中滑移线场的构造     

殷绥域 《地球科学》1990,15(2):221-228

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山东及附近区域地震断层错动性质与地壳应力场特征     

山长仑  李霞  范培乐  赵淑华  石玉燕 《地震地磁观测与研究》2013,(5):32-39

利用P、SH、SV波的初动及振幅比获得2001年4月至2012年8月山东及附近区域132次地震震源机制解,对该区域地震断层的错动性质及地壳应力场特征进行分析.结果表明,山东及附近区域地震断层错动的基本方向为北东向和北西向,错动方式以走向滑动为主,部分为斜向滑动.分区研究表明：聊考断裂带附近区域所受挤压作用相对较强,逆断型地震破裂较多;胶东半岛及北侧海域所受拉张作用略占优势,逆断型地震破裂较少;沂沭断裂带南部附近区域逆断型与正断型的地震破裂所占比例差别不大.  相似文献   

Theoretical and quantitative analyses of the fault slip rate uncertainties from single event and erosion of the accumulated offset     

Zhikun Ren  Zhuqi Zhang  Tao Chen  Weitao Wang 《Island Arc》2013,22(2):185-196

Fault slip rate is one of the most important subjects in active tectonics research, which reveals the activity and seismic potential of a fault. Due to the improvement of dating precision with the development of dating methods, Holocene geological markers, even the young markers of thousands or hundreds of years old, are widely used in fault slip rate calculation. Usually, uncertainties from a single event and erosion of the accumulated offsets are involved in fault slip rate determination. Two types of uncertainties are related to a single event; the first is the time elapsed since the latest (the most recent) event; the second is the period since the formation of the geological marker to the occurrence of the first event. High‐slip‐rate faults are more sensitive to these uncertainties than low‐slip‐rate faults. In this study, we studied quantitatively the effects of a single event on fault slip rate following the three classic earthquake models: the characteristic earthquake, uniform slip and variable slip models. We suggest that the erosion of the accumulated offset–lateral erosion on a strike‐slip fault, should also be considered in fault slip estimation. Therefore, we propose a differential method to obtain a reliable fault slip rate. In the differential method, the slip rate is the ratio of offset differentials and corresponding age differentials between the older and younger terraces along strike‐slip faults. This kind of differential method could avoid the uncertainties from the first and latest events, as well as that from the lateral erosion. By applying the differential method, we got the revised slip rates of ∼5–10 mm/year on the Altyn Tagh and Kunlun faults. These low slip rates could fit previous geodetic and geological fault slip rates and shortening rates as well as the millennial recurrence intervals of strong earthquakes along the major segments of these faults.  相似文献   

用阶地测量方法探讨阿尔金断裂中段全新世滑动速率   总被引：9，自引：3，他引：6       下载免费PDF全文

王峰  徐锡伟  郑荣章 《地震地质》2004,26(1):61-70

通过分析高精度数字化SPOT卫星影像 ,结合野外考察和年代学测试 ,对阿尔金南缘走滑断裂带的 3个典型走滑断层断错地貌点进行了研究。在安南坝沟 ,阿尔金南缘走滑断裂带一主要分支自 (9.36± 0 .73)kaBP以来的左旋滑动速率为 (7.5± 1.7)mm/a ;在七个泉子阿尔金南缘走滑断裂带有 4条分支 ,其中 1条规模较小的断层分支自 (13 86± 1 0 7)kaBP以来的左旋滑动速率为 (2 .3±0 5 )mm/a ,由此推断七个泉子附近断裂带全新世以来的滑动速率为 (6 .9± 1.5 )～ (9.2± 2 .0 )mm/a ;约马克其断裂带自 (4 .73± 0 .38)kaBP以来的左旋滑动速率为 (10 .6± 3.0 )mm/a。综合以上各点结果 ,阿尔金南缘走滑断裂带中段 88°30′E与 93°0 5′E之间全新世以来的水平滑动速率为 7～ 11mm/a ,与最新的GPS观测结果非常接近  相似文献   

利用GPS和水准测量资料反演2001年昆仑山口西8.1级地震的同震滑动分布   总被引：21，自引：1，他引：20       下载免费PDF全文

万永革  王敏  沈正康  陈杰  张祖胜  王庆良  甘卫军 《地震地质》2004,26(3):393-404

通过分析 2 0 0 1年昆仑山口西MS8.1地震前后的GPS资料和 1 979— 2 0 0 2年的水准测量资料 ,获得了地表同震位移场。利用这些同震位移数据 ,以震后详细野外地质调查破裂数据为约束 ,反演了破裂断层面上的同震滑动分布。结果表明 ,破裂下界深度为 1 4 .2～ 2 1km(70 %置信区间 ) ,最佳破裂深度 1 7km。虽然在太阳湖段和主破裂带西端的中间区域未观测到地表破裂 ,但反演的结果表明此区域存在 2～ 3m左右的左旋水平走滑 ,与InSAR资料分析得到的结果一致。地表以下的破裂西端止于太阳湖段 ,而东端似乎在地表破裂迹线以东 30km范围内仍存在 1 .5～ 2 .0m的左旋滑动。反演的垂直位移表明断层在东经 93°以西部分大体表现为南盘上升 ,而东经 93°以东部分表现为北盘上升。由大地测量和地表破裂调查得到的地震矩释放为 6 .1× 1 0 2 0 N·m ,与地震波资料的反演结果基本一致  相似文献   

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????4?????е?????????????????????????Okada?????????λ???????????????λ???????????????????????λ?????????????????GPS???λ??????ж??????????????????????????????о????????????λ?????????λ??????????????????????????????????????????????????λ?????????λ?????GPS????????????????????в?????Δv-?0.007 m???в?Э????????tr??Σ???0.006 m????????????????????????λ??????????????????????????????S2A??=7.170 16 m??2????S2B=91.407 7 m??2???????????λ???????????????????????????????????????????????????????????????????????????λ?????????????????????  相似文献   

四川西部理塘-巴塘地区的活动断裂与1989年巴塘6.7级震群发震构造研究   总被引：1，自引：0，他引：1       下载免费PDF全文

周荣军  陈国星  李勇  周朝晖  龚宇  何玉林  黎小刚 《地震地质》2005,27(1):31-43

四川西部的理塘—巴塘地区以近SN向的断裂构造为主,并发育 1组NNE和NW向的共轭剪切破裂带。文中在详细的TM卫片和航空照片判译的基础上,以活动构造地貌学为主线,重点解析了该地区断裂构造晚更新世—全新世以来活动的表现形式,确定近SN向的金沙江断裂带晚第四纪以来的近EW向的缩短速率为 2~3mm/a,NNE向巴塘断裂的右旋水平滑动平均速率为1. 3~2. 7mm/a,NW向理塘断裂的左旋水平滑动平均速率为 2 .6~4. 4mm/a。结合地球物理场、震源机制解、GPS测量等资料,分析了该地区现今地壳运动的总体态势及其所导致的块体运移规律,指出 1989年巴塘 6 .7级震群的成因,是由于NNE向巴塘断裂和NW向理塘断裂共轭剪切所派生的近EW向正断层的张性破裂所致,揭示了一个挤压构造环境内正断层发震的典型震例  相似文献