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川滇地区断层形变模型与应变积累分析 被引量:16
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作者 方颖 江在森 +2 位作者 张晶 王武星 张艳梅 《大地测量与地球动力学》 CSCD 北大核心 2006年第2期48-52,65,共6页
用改进的断层形变模型和GPS资料对川滇地区主要断层的地表水平滑动(沿断层走向)和沿断层方向的应变进行了计算。结果显示小江断裂的中南段和楚雄断裂的东南段锁定程度较高,其它分段锁定程度偏低;沿断层方向应变积累的高值区为鲜水河的... 用改进的断层形变模型和GPS资料对川滇地区主要断层的地表水平滑动(沿断层走向)和沿断层方向的应变进行了计算。结果显示小江断裂的中南段和楚雄断裂的东南段锁定程度较高,其它分段锁定程度偏低;沿断层方向应变积累的高值区为鲜水河的炉霍段、乾宁至色哈拉、雅拉河段,小江断裂北段与则木河断裂的交会处、东川南侧及小江断裂南段的宜良一带;鲜水河断裂及小江断裂北段下盘的应变值、应变梯度均高于上盘,而小江断裂中南段上下盘没有明显的差异;红河断裂应变水平偏低;楚雄断裂其应变的高梯度带集中在东南段小江断裂附近。 展开更多
关键词 断层形变模型 滑动速率 应变积累 震源深度 断层锁定深度
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Influences of pre-existing fracture on ground deformation induced by normal faulting in mixed ground conditions 被引量:8
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作者 蔡奇鹏 吴宏伟 +1 位作者 骆冠勇 胡平 《Journal of Central South University》 SCIE EI CAS 2013年第2期501-509,共9页
Physical model tests have been conducted by various researchers to investigate fault rupture propagation and ground deformation induced by bedrock faulting. However, the effects of pre-existing fracture on ground defo... Physical model tests have been conducted by various researchers to investigate fault rupture propagation and ground deformation induced by bedrock faulting. However, the effects of pre-existing fracture on ground deformation are not fully understood. In this work, six centrifuge tests are reported to investigate the influence of pre-existing fracture on ground deformation induced by normal faulting in sand, clay and nine-layered soil with interbedded sand and clay layers. Shear box tests were conducted to develop a filter paper technique, which was adopted in soil model preparation to simulate the effects of pre-existing fracture in centrifuge tests. Centrifuge test results show that ground deformation mechanism in clay, sand and nine-layered soil strata is classified as a stationary zone, a shearing zone and a rigid body zone. Inclination of the strain localization is governed by the dilatancy of soil material. Moreover, the pre-existing fracture provides a preferential path for ground deformation and results in a scarp at the ground surface in sand. On the contrary, fault ruptures are observed at the ground surface in clay and nine-layered soil strata. 展开更多
关键词 centrifuge modeling pre-existing fracture ground deformation normal faulting EARTHQUAKE
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Regional Tectonic Deformation Background and Medium- and Short-Term Precursors to the Minle-Shandan Earthquakes1
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作者 ZhangXi WangShuangxu CuiDuxin ZhangXiaoliang XueFuping ChenBing 《Earthquake Research in China》 2005年第1期12-21,共10页
Using GPS observations of horizontal movement from 2001 to 2003 and the cross-fault mobile short-levelling data of 1988~2003, and with the aid of the improved negative dislocation model and the time-varying curve of ... Using GPS observations of horizontal movement from 2001 to 2003 and the cross-fault mobile short-levelling data of 1988~2003, and with the aid of the improved negative dislocation model and the time-varying curve of strain intensity ratio of fault deformation, the regional tectonic deformation background and medium- and short-term precursors related to the preparation of the Minle-Shandan earthquakes of M S6.1 and M S5.8 on October 25, 2003 are investigated. The results reveal that, under the background of the wide-range deformation adjustment, short-term relaxation and recovery caused by the Kunlun Mountains earthquake of M S8.1, the hypocenters of the earthquakes are located on the north edge of the shear stress enhancement zone between the compressional locked segments of block boundary fault, a place which may represent an accelerated strain accumulation. An obvious anomaly of strain intensity ratio appeared in short-levelling measurements crossing over the fault at the Shihuiyaokou site, the closest to the epicenters, 3 months before the occurrence of the earthquakes. In addition, the variation in number of anomalies from 10-odd days to months before the earthquakes in the entire monitoring area and the anomaly concentration and local enhancement relative to near source in the 3 months before the earthquakes are regarded to be precursors to the two events. 展开更多
关键词 The Minle-Shandan earthquakes Crustal deformation Negative dislocation model Strain intensity ratio of fault deformation Background of earthquake preparation Precursory anomaly
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