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辽宁省主要活动断层与地震活动特征分析 总被引:6,自引:1,他引:5
本文结合编制 1:100 万辽宁省地震构造图,分析了辽宁省近 20 年来地震构造环境相关研究成果,确定辽宁地区共有第四纪以来活动断裂 29 条:全新世断裂 1 条;晚更新世断裂 5 条;早、中更新世断裂 23 条。其中北东向晚更新世活动断裂和北西向全新世活动断裂为辽宁地区的主要控震、发震构造。北东向晚更新世活动断裂与北西向断裂交汇部位、海城河隐伏断裂的端点部位和鸭绿江断裂南西端黄海海域是未来发生中强地震的主要部位。本研究可为深入研究辽宁地区地震构造条件、编制第五代全国地震区划图提供基础资料。 相似文献
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大石头- 宋三台断裂是一条穿过鞍山市区的隐伏构造,通过电法、人工浅层地震和地质雷达等综合地球物理探测和实地调查认为,该断裂从市区东南的腾家房身进入鞍山市,大体沿310°~320°方向延伸,经交通技校、铁西九道街、宋三台直至下辽河平原边缘。断裂在市区延伸长度约12-5km ,宽几十厘米至几十米,垂直断距几米至10 余米。该断裂结构复杂,产状多变,形态多样。时而表现为单条断裂,时而出现2 ~4 条相互平行的断裂组,其最新活动时代为中更新世,不是活动断裂 相似文献
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潮汕盆地主要受控于北东向和北西向2组断裂构造,盆地及周缘曾发生过多次破坏性地震。因此,厘定相关断裂的构造特征和第四纪活动性,对合理评估区域地震危险性至关重要。在系统总结和分析已有第四系钻孔年代学的基础上,采用野外地质调查与地球物理勘探相结合的方法,对潮汕盆地及周缘断裂构造开展详细的研究工作。盆地周缘基岩区断裂构造野外解析表明,北西向断裂具有正断层性质,兼具左行走滑特征,北东向断裂以逆冲变形为主。结合盆地第四系覆盖区浅层人工地震探测和已有地层年代学分析结果,进一步厘定了榕江断裂、韩江断裂、饶平-汕头断裂和普宁-潮州断裂在潮汕盆地内的几何学展布和晚更新世以来的活动特征。 相似文献
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本文以丰富和翔实的地质、地貌、年代测定、地球物理、地震等资料,阐述了晋江下游北西向断裂带的几何特征,分析了断裂带晚更新世以来的活动性,并探讨了断裂活动与地震的关系。结果表明:(1)晋江下游北西向断裂带从南安仑苍到晋江河口形迹清晰,断裂规模自西北向东南不断增大;(2)晋江下游北西向断裂带晚更新世以来,不同段落的活动性亦表现出自西北向东南不断增强和变新的特点,南安仑苍一丰州段为早第四纪断裂,丰州一晋江河口段发育有晚更新世断裂;(3)沿晋江下游北西向断裂带,在其与北东向断裂交汇部位附近,历史上曾发生过6次中强地震,地震有自西北向东南频度升高和强度增大的趋势。 相似文献
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本文通过地貌、第四纪地层、钻探、槽探和浅层地震勘探等资料分析,研究了闽江断裂带第四纪活动特征,并探讨了活动断裂与地震的关系。结果表明:(1)闽侯-南屿断裂展布于旗山东侧山前,与五虎山北麓断裂共同组成北西向的闽江断裂带,控制了福州盆地的西侧和南侧边界;(2)闽江断裂带的活动时代从山地向平原方向逐渐变新,山地基岩内的断裂为中更新世断裂,山前断裂多为晚更新世断裂,呈正断性质,上盘沉积速率为0.78mm/a—1.2mm/a;(3)闽江断裂带及其与北东向断裂交汇部位附近小震活动相对密集。 相似文献
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川滇地区强地震活动与区域新构造运动的关系 总被引:33,自引:0,他引:33
在分析了川滇地区强震活动空间分布的非均匀性图象、震源破裂图象及震源断层力学性质等资料的基础上,讨论了该地区强震活动与区域活动断裂、活动地块现今运动状态、深部介质构造环境等的关系,对该区强震活动特征及其可能的力学机制进行了讨论. 相似文献
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1966年邢台地震群的发震构造模型——新生断层形成?先存活断层摩擦粘滑? 总被引:7,自引:0,他引:7
通过对邢台地震极震区浅层探测、新生代深浅构造运动的分期、地壳上地幔结构特征剖析及其与震源参数的对比等研究,指出邢台地震区控制早第三纪盆岭构造发育的铲形断裂及其下部向东缓倾的滑脱面与邢台地震的发生无关;邢台地震群是在最新构造应力场作用下,受北西向断层或横向障碍体阻隔的不连续“深断裂”依次向上撕裂状破裂扩展、引起相邻斜列状深断裂间应力迁移和加载等三维破裂过程的产物;邢台地震断层是先存地壳“深断裂”向上撕裂状扩展的“新生断层”。 相似文献
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ACTIVE FAULTS AND THEIR FORMATION MECHANISM IN THE EAST SEGMENT OF QIULITAGE ANTICLINE BELT,KUQA DEPRESSION
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LI Sheng-qiang ZHANG Ling YANG Xiao-ping HUANG Wei-liang HUANG Xiong-nan YANG Hai-bo 《地震地质》2016,38(2):223-239
Based on geological and geomorphologic characteristics of the surface faults acquired by field investigations and subsurface structure from petroleum seismic profiles, this paper analyzes the distribution, activity and formation mechanism of the surface faults in the east segment of Qiulitage anticline belt which lies east of the Yanshuigou River and consists of two sub-anticlines:Kuchetawu anticline and east Qiulitage anticline. The fault lying in the core of Kuchetawu anticline is an extension branch of the detachment fault developed in Paleogene salt layer, and evidence shows it is a late Pleistocene fault. The faults developed in the fold hinge in front of the Kuchetawu anticline in a parallel group and having a discontinuous distribution are fold-accommodation faults controlled by local compressive stress. However, trenching confirms that these fold-accommodation faults have been active since the late Holocene and have recorded part of paleoearthquakes in the active folding zone. The fault developed in the south limb near the core of eastern Qiulitage anticline is a low-angle thrust fault, likely a branch of the upper ramp which controls the development of the eastern Qiulitage anticline. The faults lying in the south limb of eastern Qiulitage anticline are shear-thrust faults, which are developed in the steeply dipping frontal limb of the fault-propagation folds, and also characterized by group occurrence and discontinuous distribution. Several fault outcrops are discovered near Gekuluke, in which the Holocene diluvial fans are dislocated by these faults, and trench shows they have recorded several paleoearthquakes. The surface anticlines of rapid growth and associated accommodation faults are the manifestations of the deep faults that experienced complex folding deformation and propagated upward to the near surface, serving as an indicator of faulting at depth. The fold-accommodation faults are merely local deformation during the folding process, which are indirectly related with the deep faults that control the growth of folds. The displacement and slip rate of these surface faults cannot match the kinematics parameters of the deeper fault, which controls the development of the active folding. However, these active fold-accommodation faults can partly record paleoearthquakes taking place in the active folding zone. 相似文献
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Evolution of crustal deformation in the northeast–central Japanese island arc: Insights from fault activity
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We evaluated fault activity in northeast–central Japan based on fault orientation, regional stress field, and slip tendency analysis for active and non‐active faults (i.e. faults for which Quaternary activity has not been identified). Slip tendency is generally higher along active faults than non‐active faults, although a high slip tendency was observed along some non‐active faults, indicating their potential to become active. The potential for fault activity along non‐active faults can be modeled using the temporal evolution from non‐active to active during long‐term crustal deformation. The density of potentially active faults varies spatially across the study areas and reflects the temporal evolution of crustal deformation in northeast–central Japan. 相似文献
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在广州市目标区内的主要活动断层危险性评价的基础上,综合活断层探测的研究成果和资料,对于具有潜在发震可能的主要断层,基于凹凸体震源模型建模理论进行了特征计算模型的建模。根据断层地震危险性分析确定的断层发震震级和几何参数,进行了断层的宏观参数和微观参数的设定。为通过复核预测方法计算与合成近断层强地震动场和城市危害性评价提供了科学的依据。 相似文献
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西藏尼木南北向活动构造带的初步研究 总被引:2,自引:0,他引:2
西藏尼木南北向活动构造带是西藏高原上著名的当雄—羊八井—多庆错活动构造带的组成部份,具有强烈的第四纪活动性。它由活动断裂和裂陷型断陷盆地两大部份构成。盆地内的地貌特征显示它在第四纪持续沉降的特点。该带中的活动断裂主要有两组,即南北向和北北东向。第四记的强烈活动在带内留下了众多的断错地貌现象,南北向活动断裂的主要活动时期较早,在更新世。北北东向活动断裂的主要活动时期较晚,在全新世。 相似文献