Slip-rate estimate and past earthquakes on the Doruneh fault, eastern Iran     

M. Fattahi  R. T. Walker  M. M. Khatib  A. Dolati  A. Bahroudi 《Geophysical Journal International》2007,168(2):691-709

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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   

Subsidence history and forming mechanism of anomalous tectonic subsidence in the Bozhong depression, Bohaiwan basin   总被引：1，自引：0，他引：1  

MüLLER R. Dietmar 《中国科学D辑(英文版)》2007,50(9):1310-1318

The Bozhong depression of the Bohaiwan basin belongs to a family of extensional basins in East China, but is quite different from other parts of the basin. The Cenozoic subsidence of the depression is controlled by a combination of lithospheric thinning and polycyclic strike-slip movements. Three episodic rifts have been identified, i.e. Paleocence-early Eocene, middle-late Eocene and Oligocene age. The depression underwent syn-rift and post-rift stages, but two episodic dextral movement events of the strike-slip faults modify the subsidence of the Bozhong depression since the Oligocene. The early dextral movement of the Tan-Lu fault associated with crustal extension resulted in accelerated subsidence during the time of deposition of the Dongying Formation with a maximum thickness of 4000 m. A late reactivation of dextral movement of the Tan-Lu fault began in late Miocene (about 12 Ma), which resulted in the intense subsidence of Minghuazhen Formation and Quaternary. In addition, dynamic mantle convection-driven topography also accelerated the post-rift anomalous subsidence since the Miocene (24.6 Ma). Our results indicate that the primary control on rapid subsidence both during the rift and post-rift stages in the Bozhong depression originates from a combination of multiple episodic crustal extension and polycyclic dextral movements of strike-slip faults, and dynamic topography.  相似文献   

燕山板内造山带中段近东西向中生代右行走滑构造系统   总被引：20，自引：0，他引：20  

张长厚  宋鸿林等 《地球科学》2001,26(5):464-472

阐述了分布燕山板内造山带中段的近东西向中生代右行走滑构造系统的几何学与运动学特征，指出该右行走滑断裂系统由古北口－平泉断裂和密云－喜峰口－锦西断裂两条主干断裂，以及夹于其间的北西向张性断层和张裂脉，北东向压性断层和褶皱等共同组成，近东西向主干断裂具有右行右列“P破裂”结构形式，北西向的张性断层和张裂脉则具有“T破裂”性质，主干断裂与北东向压性断裂和褶皱构成了一幅右行走滑双重构造（strike-slip duplexs)格局，而不是不同期次变形的产物。该走滑断裂系统形成于侏罗纪末一早白垩世初（147－132Ma)，由于它恰好构成了位于辽西的走向北东，向南东逆冲的逆冲推覆构造系统与冀北，冀西北地区北东走向，上盘向北西逆冲的推覆构造的转换和调节部位，所以本文提出了一个右行走滑构造系统的统一构造模式，在该模式中，辽西和冀北，冀西北同时代而运动方向相反的逆冲构造系统分别构成了近东西向右行走滑系统的断盘前缘挤压逆冲构造区，认为惦记山板内造山带总体构造格局的区域构造作用方式是：在总体北西一南东向挤压的一级构造应力场作用下，造山带北部的块体相对于中生代华北地台为主体的块体做向东的右景下，燕山板内造山带可能构成了亚洲东部另一个重要的“挤出构造带”或“逃逸构造域”，这种推测需要得到北部东西向断裂系具有同期左行走滑运动的支持。  相似文献   

莺歌海盆地晚第三纪构造特征的三维泥料模拟实验及其动力学意义   总被引：5，自引：0，他引：5       下载免费PDF全文

殷秀兰  李思田等 《地质论评》2001,47(5):535-541

莺歌海盆地是发育在古红河断裂带之上的新生代盆地，晚第三纪的构造运动触发了盆地中热流体自超压封存箱向外大规模突破，使热流体及泥质的活动具有规律性成群成带的特征。本次实验基于相似理论，在对盆地的演化史及区域构造应力场充分分析的基础上，进行了晚第三纪盆地构造应力场的三维泥料模拟，证实了红河断裂右旋走滑派生的拉分效应控制了莺歌海盆地晚第三纪的构造活动，而晚第三纪的构造活动又是雁列式断裂展布及底辟体分布的主导因素。  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   

Sinistral Strike-slip Movement Along Western Terminal Segment of the Active Daqingshan Piedmont Fault, Inner Mongolia, China     

Jiang Wali  Xiao Zhenmin  Wang Huanzhen 《中国地震研究》2001,15(1):15-24

There are 18 gullies displaying sinistral contortions to different degrees along the western terminal segment about 10 km long of the active Daqingshan piedmont fault near the Donghe District, Baotou City. The contortion amount of gullies ranges from 20 m to 300 m. The contortion and length of the gullies are in direct proportion. The relation between piedmont terraces and gullies indicates that the gullies with upper reaches of about 1 ～ 5 km long and those smaller than one kilometer were formed at the end of Late Pleistocene and Holocene.Meanwhile, sandy gravel layer of alluvial-proluvial sediment on the upthrown wall is directly in contact with yellow clayey sand of the downthrown wall. During the Holocene, the sinistral strike-slip rate along the western terminal segment of the active Daqingshan piedmont fault reached 5 mm/a from age data of dislocated sediments. The evolutional mechanism of the active Daqingshan piedmont fault is also discussed in the paper.  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   

Morphological characteristics of the earthquake surface ruptures on Awaji Island, associated with the 1995 Southern Hyogo Prefecture Earthquake   总被引：1，自引：0，他引：1  

Aiming  Ian Shinichi  Uda 《Island Arc》1996,5(1):1-15

Abstract The earthquake surface ruptures on the northern side of Awaji Island accompanying the 1995 Southern Hyogo Prefecture Earthquake in Japan consist of three earthquake surface rupture zones called the Nojima, Matsuho, and Kusumoto Earthquake Surface Rupture Zones. The Nojima Earthquake Surface Rupture Zone is - 18 km long and was formed from Awaji-cho at the northern end of Awaji Island to Ichinomiya-cho. It occurred along the pre-existing Nojima geological fault in the northern segment and as a new fault in the southern segment. The northern segment of the Nojima Earthquake Surface Rupture Zone is composed of some subparallel shear faults showing a right-step en echelon form and many extensional cracks showing a left-step en echelon form. The southern segment consists of some discontinuous surface ruptures which are concentrated in a narrow zone a few tens of meters in width. This surface rupture zone shows a general trend striking north 30°-60° east, and dipping 75°-85° east. The deformational topographies and striations on the fault plane generated during the co-seismic displacement show that the Nojima Earthquake Surface Rupture Zone is a right-lateral strike-slip fault with some reverse component. Displacements measured at many of the outcrops are generally 100-200 em horizontally and 50-100 em vertically in the northern segment and a few em to 20 em both horizontally and vertically in the southern segment. The largest displacements are 180 em horizontally, 130 em vertically, and 215 em in netslip measured at the Hirabayashi fault scarp. The Matsuho Earthquake Surface Rupture Zone striking north 40°-60° west was also found along the coastline trending northwest-southeast in Awaji-cho for ～1 km at the northern end of Awaji Island. The Kusumoto Earthquake Surface Rupture Zone occurred along the pre-existing Kusumoto geological fault for ～ 1.5 km near the northeastern coastline, generally striking north 35°-60° east, dipping 60°-70° west. From the morphological and geomorphological characteristics, the Nojima Earthquake Surface Rupture Zone can be divided into four segments which form a right-step en echelon formation. The geological and geomorphological evidence and the aftershock epicenter distributions show clearly that the distributions and geometry of these four segments are controlled by the pre-existing geological structures.  相似文献