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越南越南红河断裂活动性筹商(四)

发布时间:2019-05-10 浏览数:460
3.2地震活动与形变观测

通过赴越南伺探换取,我们收集到了越南自公元1272年以来的历史地震目录、20世纪有仪器观测以来的地震目录和20世纪90年代中国台湾中央大学蔡义本教授在越南北部沿红河断裂带架设的18个临时数字地震观测站所记载到的小震目录(吴幸鸿,2002),迅达注册流程开户流程。相关筹商终局将另文宣告。凭据以上材料,迅达注册流程开户流程。越南红河断裂历史记载最大地震为5.3级。迅达注册流程开户流程。初步理会讲明,越南红河断裂带地震活动总体上延续了云南境内弥渡以南段的特征,迅达会员注册流程。即地震活动频次低、震级小。而中国台湾中央大学临时台网的监测终局显示尤其突出的局面是,在红河断裂展布的越南北部地域绝对断裂两侧地域而言,似乎越亲近红河断裂带,地震活动的频次越低、震级也越小。

此外,凭据1963,1983年2期超过南红河断裂三角丈量和1994,迅达线路。1996,1998,迅达电脑登录网址。2000年4期GPS观测及管束终局,显示前者由于断裂活动微弱和观测精度所限,迅达平台登录注册。在95%可信区间内越南红河断裂的右旋滑动速率近乎为零,而GPS观测数据管束终局则讲明越南红河断裂右旋滑动速率<2mm/a( Feigl et al.迅达测速手机登录。.,203),与云南境内红河断裂西北段的GPS观测及管束终局相当(吕江宁等,2003),2种手段总体上都显示了越南红河断裂的现今弱活动特征。

更值得提神的是,近年来中国围绕青藏高原及包括红河断裂在内的周边地域开展的GPS地壳形变观测,其终局越来越清晰地反映川滇块体生活顺时针旋转(张培震等,迅达娱乐平台。2001,200,迅达注册流程开户流程。2004),特别是跨云南境内红河断裂中南段的顺时针旋转和非刚性连续变形特征。越南越南红河断裂活动性筹商(四)。这对多年来把川滇块体作为整体向SSE方向活动,并且以红河断裂带为活动块体西南范围的认识提出了挑战。区域地质。而红河断裂云南中、南段直至越南境内数百千米范围晚第四纪以来的弱活动,在莺歌海盆地北部地域地震剖面中红河断裂带均未切过5.根源地质。5MaBP的不整合面(詹文欢等,2003),看来也不支持其整体上作为当代活动块体范围的职位地方。

3.3也许的大地组织和深部组织原因

红河断裂带在新组织活动晚期有过大界限左旋走滑的认识依然取得平常接纳。其动力学模式显然应该包罗印度板块沿滇缅弧向东爬升和以红河断裂带为西范围的扬子准地台“国度栋梁”的要素。而红河断裂带在前期转为右旋走滑,地质矿产。其最间接和要紧的原因依然转变为印度板块接续向北推挤一青藏高原强烈紧缩抬升一侧向挤出一旋转变形历程而派生的新的动力来源。如果上述认识是准确的,质料库。那么这还暗示着红河断裂带在时间和空间上接续的右旋走滑必必恳求断裂东侧的川滇块体完全向SSE方向活动的所谓“能动性”!诸如川滇块体壳内、壳幔的拆离条件和东范围小江断裂的解锁条件等。中国—东盟矿业讯息任事平台。但事实恰恰相同,“川滇块体”自己实际上包罗了若干在发育历史、地壳结构、介质物理力学性子等方面明显不同的大地组织单元,注册。尤其是滇中一带被称为“康滇地轴”的扬子地台区对整个川滇块体向SSE方向的活动应该起到强无力的阻难作用(马宗晋等,2001)。流程。大宗地震层析成像、人工地震测深以及震源参数筹商终局均讲明,处于扬子准地台的滇中地域地壳平均速度明显高于其周边块体(胡鸿翔等,开户。1993;黄金莉等,2001;王椿镛等,流程。202;胥颐等,2003;周庆连等,越南。2008),并具有突出的刚性变形特征(张建国等,南越。1993)。于是乎,越南。我们推测来自青藏高原紧缩、抬升、向东挤出的动力作用在受到稳定的四川盆地的阻难后,围绕东喜马拉雅组织结转为向SSE方向的推挤,之后在扬子地块的阻难调整下,再转为向SW方向跨红河断裂中、南段的推挤和变形。在此模式下,越南红河断裂的右旋走滑活动肯定受到很大限制。

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STUDY ON THE ACTIVITY OF RED RIVER

FAULT IN VIETNAM

ZHANG Jian-guo1,2) HUANGFU Gang. 2) XIE Ying-qing 2)

PHAN Trong Trin3) LIU Na2)

1)School of Earth and Space, Uninersity of Seience and Technology of China, Hefei, China

2)Earthquake Administration of Yunan Prowince, Kunming, China

3)Institute of Geological Science,Vietnam Academy of Science and Technology,

Hanoi,Vietnam

Abstract

Correlated evidences about the newest activity of Red River Fault in Vietnam( RRFV), such as seismicity, geology, geomorphology and chronology etc, have been obtained through joint survey along the fault in Vietnam. Our comprehensive studies demonstrate that, the same tendency of gradual weak ening of the fault activity from north to south in the part of China since Quaternary has been keet on in Vietnam. The primary active period of Red River Fault in Vietnam is in late of middle Pleistocene and in general, the active level of Red River Fault is lower promine ntly than that in Yunnan, China especially, the activity of RRFV has been very weak since late Pleistocene. The synthesized analysis on seismicity and regional GPS deformation monitoring data indicates that the dynamic impact of so called lateralex trusion from Tibetan Plateau on the dextral slip of RRFV should be very limited. Fur-thermore, the possible reasons including geotectonic and deep crustal structure have been discussed in the article.

Key words Red River Fault in Vietnam, active period, accumulated displacement, geoleeto deep crustal structure