Combining InSAR and seismology to study the 2003 Siberian Altai earthquakes—dextral strike-slip and anticlockwise rotations in the northern India–Eurasia collision zone     

Edwin Nissen  Brian Emmerson  Gareth J. Funning  Anatoly Mistrukov  Barry Parsons  David P. Robinson  Eugene Rogozhin  Tim J. Wright † 《Geophysical Journal International》2007,169(1):216-232

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A new fault rupture scenario for the 2003 M_w 6.6 Bam earthquake, SE Iran: Insights from the high-resolution QuickBird imagery and field observations     

Bihong Fu  Xinglin Lei  Khaled Hessami  Yoshiki Ninomiya  Takashi Azuma  Hisao Kondo 《Journal of Geodynamics》2007,44(3-5):160-172

The December 26, 2003 M_w 6.6 Bam earthquake is one of the most disastrous earthquakes in Iran. QuickBird panchromatic and multispectral satellite imagery with 61 cm and 2.4 m ground resolution, respectively provide new insights into the surface rupturing process associated with this earthquake. The results indicate that this earthquake produced a 2–5 km-wide surface rupture zone with a complex geometric pattern. A 10-km-long surface rupture zone developed along the pre-existing Bam fault trace. Two additional surface rupture zones, each 2–5 km long, are oblique to the pre-existing Bam fault in angles of 20–35°. An analysis of geometric and geomorphic features also shows that movement on the Bam fault is mainly right-lateral motion with some compressional component. This interpretation is consistent with field investigations, analysis of aftershocks as well as teleseismic inversion. Therefore, we suggest that the 2003 Bam earthquake occurred on the Bam fault, and that the surface ruptures oblique to the Bam fault are caused by secondary faulting such as synthetic shears (Reidel shears). Our fault model for the Bam earthquake provides a new tectonic scenario for explaining complex surface deformations associated with the Bam earthquake.  相似文献   

华夏地块东南部地壳地震各向异性特征初步研究   总被引：4，自引：5，他引：4       下载免费PDF全文

吴晶  高原  蔡晋安  石玉涛  林树  鲍挺  李祖宁 《地球物理学报》2007,50(6):1748-1756

本研究采用SAM剪切波分裂分析方法，使用福建区域数字地震台网记录到的（1999年01月～2003年12月）的波形资料，挑选符合剪切波窗口条件的记录，得到华夏地块东南部地区23°N～29°N，116°E～120°E）10个台站的剪切波分裂参数. 研究结果表明，该区域快剪切波平均偏振方向为NW109.4°±42.6°，慢剪切波平均时间延迟为2.5±1.5(ms/km)，快剪切波平均偏振方向对应该区的水平主压应力方向. 闽东台站NW方向的快剪切波偏振优势方向揭示了NW向的水平主压应力和NW走向断裂的构造意义. 两个闽西台站NE方向的快剪切波偏振优势方向与区域水平主压应力方向不一致，与NE走向的断裂一致，体现了局部构造和局部应力场的复杂性. 本研究证实，位于活动断裂上的台站的快剪切波偏振方向的优势方向与断裂走向一致，位于海边或岛上的台站的快剪切波偏振方向较为离散，主要是受到不规则表面地形和断裂交汇的影响. 慢剪切波延迟时间的空间分布特征，显示沿海地区慢剪切波延迟时间变化较大，而内陆地区则较为平缓.  相似文献   

青藏高原新生代构造和第四纪研究的进展及问题讨论   总被引：2，自引：2，他引：2       下载免费PDF全文

袁道阳  张培震 《地震工程学报》2001,23(2):199-205

简述了近年来国内外在青藏高原晚新生代构造和第四纪地质研究方面所取得的新进展，针对在活动构造研究中所存在的问题，提出 今后研究工作的方向，认为应当加强青藏高原及其周缘地区晚新生代构造变形方式、幅度和速率的研究，同时在研究中应当将第四纪地质与活动构造研究相结合，特别要注重深部构造的研究。  相似文献   

隐伏断层灾害的研究与地震保险     

刘志远  陈英方 《国际地震动态》2001,(5):29-32

简要介绍了近年来一些国家地震灾害造成的经济损失占这些国家国内生产总值的比例；主要介绍了多震地区开展地震断层探测研究的概况以断层活动为基础的地震保险试验的内容及研究进展。  相似文献   

Fault-controlled dolomitization at Swan Hills Simonette oil field (Devonian), deep basin west-central Alberta, Canada   总被引：6，自引：0，他引：6  

James P. Duggan  Eric W. Mountjoy  & Lavern D. Stasiuk 《Sedimentology》2001,48(2):301-323

The partly dolomitized Swan Hills Formation (Middle‐Upper Devonian) in the Simonette oil field of west‐central Alberta underwent a complex diagenetic history, which occurred in environments ranging from near surface to deep (>2500 m) burial. Five petrographically and geochemically distinct dolomites that include both cementing and replacive varieties post‐date stylolites in limestones (depths >500 m). These include early planar varieties and later saddle dolomites. Fluid inclusion data from saddle dolomite cements (T_h=137–190 °C) suggest that some precipitated at burial temperatures higher than the temperatures indicated by reflectance data (T_peak=160 °C). Thus, at least some dolomitizing fluids were ‘hydrothermal’. Fluorescence microscopy identified three populations of primary hydrocarbon‐bearing fluid inclusions and confirms that saddle dolomitization overlapped with Upper Cretaceous oil migration. The source of early dolomitizing fluids probably was Devonian or Mississippian seawater that was mixed with a more ⁸⁷Sr‐rich fluid. Fabric‐destructive and fabric‐preserving dolostones are over 35 m thick in the Swan Hills buildup and basal platform adjacent to faults, thinning to less than 10 cm thick in the buildup between 5 and 8 km away from the faults. This ‘plume‐like’ geometry suggests that early and late dolomitization events were fault controlled. Late diagenetic fluids were, in part, derived from the crystalline basement or Palaeozoic siliciclastic aquifers, based on ⁸⁷Sr/⁸⁶Sr values up to 0·7370 from saddle dolomite, calcite and sphalerite cements, and ²⁰⁶Pb/²⁰⁴Pb of 22·86 from galena samples. Flow of dolomitizing and mineralizing fluids occurred during burial greater than 500 m, both vertically along reactivated faults and laterally in the buildup along units that retained primary and/or secondary porosity.  相似文献   

河北磁县北西西向南山村－岔口活动断裂带活动特征与1830年磁县地震   总被引：6，自引：3，他引：6       下载免费PDF全文

江娃利  张英礼 《地震地质》1996,18(4):349

河北磁县西部北西西向南山村－岔口活动断裂为北西西向磁县活动断裂西段，全长３５ｋｍ，又可再分为东西两段。全新世时期该断裂有多次活动，活动方式以具左旋性质的正倾滑为主。１８３０年磁县７．５级地震时，南山村－岔口断裂带出现新的地表破裂，地表垂直位移多处为２～４ｍ，最大约７ｍ。据目前资料，该断裂带最新两次地震事件的时间间隔约为３５００ａ。最近获取的位于磁县最高峰老爷山庙宇碑文资料，补充说明了邻近岔口活动断裂带的古建筑物在１８３０年地震中的严重破坏。  相似文献   

活断层运动区段的划分问题   总被引：1，自引：0，他引：1       下载免费PDF全文

刘行松  唐汉军 《地震地质》1992,14(2):140-144

断层运动是复杂而多变的,在一条巨大的断裂带上经常以区段为单位活动,每次活动的区段长度、运动量等都不相同,且往往具有一定的迁移规律等。为工程建设和强震的预测,划分活断层运动区段越来越迫切。以一次强震活动序列、跨断层大地测量网的复测、直接鉴定断层新活动、并结合地形地貌和地下水位变化等途径来划分断层运动的区段  相似文献   

活动断层的滑动样式与段落类型初析   总被引：3，自引：0，他引：3       下载免费PDF全文

冉勇康  汪一鹏 《地震地质》1992,14(3):227-236

通过历史地震破裂、古地震重复和断层活动特征等实例的研究,揭示出活动断层至少存在8种滑动样式及其相应的段落。这些段落以滑动特征而论可归纳为稳定型、暂时型、随变型和萎缩型4大类,而据发震特点则可分为典型特征地震型、广义特征地震型和非特征地震型。稳定型段落为活动断层的最重要、最普遍的类型  相似文献   

安宁河断裂带北段的最新地面活断层与地震潜在能力研究          下载免费PDF全文

钱洪  唐荣昌  文德华  黄祖智 《地震地质》1992,14(4):317

从最新地面活断层的不连续性,断层滑动速率以及古地震研究的角度讨论安宁河断裂带北段的地震潜在能力,认为不连续的活断层可能成为各自独立的地震破裂单元,从而决定了地震的潜在能力,其中,野鸡洞破裂段的潜在地震能力最强,可达7级。上次地震至今的平静时间已接近古地震的平均重现间隔,因而具有高度的地震危险性  相似文献