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Three dimensional velocity model and its tectonic implications at China Seismic Experimental Site,eastern margin of the Tibetan Plateau

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Science China Earth Sciences 2024年第7期67卷 2268-2290页

作者： Jianping WU Yan CAI Wei wang Weilai wang changzai wang Lihua FANG Yaning LIU Jing LIU Institute of Geophysics China Earthquake AdministrationBeijing 100081China Beijing Baijiatuan Earth Science National Observation and Research Station Beijing 1095China Beijing Earthquake Agency Beijing 100080China

The China Seismic Experimental Site(CSES)is located at the intersection of the Tibetan Plateau,South China Block,and Indian Plate and has complex geological settings and intense crustal deformation,making it one of the most seismically active areas in Chinese mainland.A high-resolution,three-dimensional(3D)crust-mantle velocity structure is crucial for understanding seismotectonic environments,lithospheric deformation mechanisms,and deep dynamic *** first constructed a high-vertical-resolution 3D initial velocity model using the joint inversion of receiver functions and surface waves and then obtained a 3D P-and S-wave velocity model(CSES-VM1.0)with the highest lateral resolution of 0.25°for the CSES using double-difference *** to the limitations of the Sn observation data,the resolution of the S-wave velocity model in the lower crust and upper mantle was reduced,making it closer to the initial model provided by joint inversion.A comparison with explosive-source seismic data showed that the synthetic P-wave first-arrival travel times of the new model were closer to the observations than those of the previous velocity *** velocity cross-sections across the source areas of the 2022 Lushan MS6.1 and Ludian MS6.8 earthquakes reveal that the former earthquake occurred near a weak contact zone between the Tibetan Plateau and Sichuan Basin,and the rupture of the latter earthquake occurred in a granitic area,with the northern end blocked by rigid high-velocity bodies.A clear high-velocity anomaly zone is distributed along the western margin of the Yangtze Block,revealing the spatial distribution of Neoproterozoic intermediate-basic *** high-velocity zone significantly controls the morphology of fault zones and influences the rupture processes of major *** northeast-southwest and north-south trending high-velocity anomalies were found near Panzhihua,potentially related to Neoproterozoic and Middle-Late Permian intermediate

关键词： Eastern Tibetan Plateau China Seismic Experimental Site Yangtze Block Velocity model Double-difference tomography

P-wave velocity structure beneath reservoirs and surrounding areas in the lower Jinsha River

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Earthquake Science 2023年第1期36卷 64-75页

作者： changzai wang Jianping Wu Lihua Fang Yaning Liu Jing Liu Yan Cai Poren Li Institute of Geophysics China Earthquake AdministrationBeijing 100081China

The lower reaches of the Jinsha River are rich in hydropower resources because of the high mountains,deep valleys,and swift currents in this *** region also features complex tectonic structures and frequent *** the impoundment of the reservoirs,seismic activity increased ***,it is necessary to study the P-wave velocity structure and earthquake locations in the lower reaches of the Jinsha River and surrounds,thus providing seismological support for subsequent earthquake prevention and disaster reduction work in reservoir *** this study,we selected the data of 7.670 seismic events recorded by the seismic networks in ***,and Chongqing and the temporary seismic arrays deployed *** then applied the double-difference tomography method to this data,to obtain the P-wave velocity structure and earthquake locations in the lower reaches of the Jinsha River and *** results showed that the Jinsha River basin has a complex lateral P-wave velocity *** events are mainly distributed in the transition zones between high-and low-velocity anomalies,and seismic events are particularly intense in the Xiluodu and Baihetan reservoir *** cross-sections through the Xiangjiaba and Xiluodu reservoir areas revealed an apparent high-velocity anomaly at approximately 6 km depth:this high-velocity anomaly plays a role in stress accumulation,with few earthquakes distributed inside the high-velocity *** the impoundment of the Baihetan reservoir,the number of earthquakes in the reservoir area increased *** seismic events in the reservoir area north of 27°N were related to the enhanced activity of nearby faults after impoundment:the earthquakes in the reservoir area south of 27°N were probably induced by additional loads(or regional stress changes),and the multiple microseismic events may have been caused by rock rupture near the main faults under high pore pressure.

关键词： double-different tomography downstream of the Jinsha River earthquake location P-wave velocity structure reservoir earthquakes

Relocation of the 2012 M_s6.6 Xinjiang Xinyuan earthquake sequence

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Science China Earth Sciences 2014年第12期57卷 216-220页

作者： FANG LiHua WU JianPing wang changzai wang WeiLai YANG Ting Institute of Geophysics China Earthquake Administration

At 05：07 AM on June 30, 2012 （Beijing time）, an Ms6.6 earthquake （hereafter referred to as Xinyuan earthquake） occurred at the junction of Xinyuan County, Ili Kazak Au tonomous Prefecture and Hejing County, Bayin... 详细信息

关键词：新疆维吾尔族地震序列定位北京时间新源县和静县哈萨克交界处

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Relocation of the mainshock and aftershock sequences of M_S7.0 Sichuan Lushan earthquake

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Chinese Science Bulletin 2013年第20期58卷 3451-3459页

作者： FANG LiHua WU JianPing wang WeiLai Lü ZuoYong wang changzai YANG Ting CAI Yan Institute of Geophysics China Earthquake Administration Guangdong Earthquake Administration

The mainshock of April 20,2013 Sichuan Lushan MS7.0 earthquake was relocated using a 3-D velocity *** difference algorithm was applied to relocate aftershock sequences of Lushan *** locations of 2405 aftershocks were *** location errors in E-W,N-S and U-D direction were 0.30,0.29 and 0.59 km on average,*** location of the mainshock is 102.983°E,30.291°N and the focal depth is 17.6 *** relocation results show that the aftershocks spread approximately 35 km in length and 16 km in *** dominant distribution of the focal depth ranges from 10 to 20 km.A few earthquakes occurred in the shallow *** depth profiles show fault planes dip to the northwest,manifested itself as a listric thrust *** dip angle is steep in the shallow crust and gentle in the deep *** the epicenters of aftershocks distributed mainly along both sides of the Shuangshi-Dachuan fault,the seismogenic fault may be a blind thrust fault on the eastern side of the Shuangshi-Dachuan *** relocation results reveal that there is a southeastward tilt aftershock belt intersecting with the seismogenic fault with *** speculate it is a back thrust fault that often appears in a thrust fault *** earthquake triggered the seismic activity of the back thrust fault.

关键词：余震序列地震发生庐山主震四川逆冲断层系统显示故障震源深度

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体育化阐释与文明的进程关系研究

体育学刊 2022年第2期29卷 20-25页

作者：王松阿柔娜王长在郭振清华大学体育部北京100084 清华大学社会科学学院北京100084 南京航天航空大学体育部江苏南京210016 中山市中山纪念中学广东中山528454

个体的社会的体育化与文明的进程相互交织在一起,具有“共时性”的社会型构和“贯时性”的历史变迁。体育化是埃利亚斯体育社会学理论的重要概念,其主要关注个体在体育运动中如何进行文明化,并着重反映文明的进程中个体的体育运动行为... 详细信息

个体的社会的体育化与文明的进程相互交织在一起,具有“共时性”的社会型构和“贯时性”的历史变迁。体育化是埃利亚斯体育社会学理论的重要概念,其主要关注个体在体育运动中如何进行文明化,并着重反映文明的进程中个体的体育运动行为从外在强制逐步到内在自我控制的进程。以埃利亚斯体育社会学理论中体育化概念阐释为起点,理清埃利亚斯体育化的型构逻辑,进而付诸体育化以型构社会学解释,即体育化的社会发生与心理发生。体育运动的全球化使得体育化往往超脱文明的域境,进而与文明的进程产生“互构”,即体育化为文明的进程“寻求兴奋”,文明的进程建构体育化“情感文明”。

关键词：个体的社会体育化文明的进程埃利亚斯

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太原盆地及周边地区双差层析成像

地球物理学报 2018年第3期61卷 963-974页

作者：王长在吴建平杨婷王未来范莉苹房立华中国地震局地球物理研究所北京100081

山西断陷带位于鄂尔多斯与华北地块交汇处,是我国著名的历史强震活动带之一,尤其是断陷盆地中部区域,6级以上地震频发.本研究旨在揭示忻定盆地中南部、太原盆地及临汾盆地中北部交汇处的深部结构特征,分析盆地的形成和演化,探讨该区域... 详细信息

山西断陷带位于鄂尔多斯与华北地块交汇处,是我国著名的历史强震活动带之一,尤其是断陷盆地中部区域,6级以上地震频发.本研究旨在揭示忻定盆地中南部、太原盆地及临汾盆地中北部交汇处的深部结构特征,分析盆地的形成和演化,探讨该区域孕震环境.利用山西地震台网观测数据以及固定地震台站融合流动台站得到的地震数据,共7455个地震事件,采用双差层析成像方法,反演得到了太原盆地及周边地区的三维P波速度结构及精定位结果.层析成像结果显示,忻定盆地、太原盆地的中上地壳为明显的低速异常,被高速的石岭关隆起隔开,深部结构特征相对简单.太原盆地、临汾盆地及灵石隆起之间的深部结构特征较为复杂,反映了两个盆地演化过程的复杂性.穿过忻定盆地的速度剖面显示,在中地壳存在明显的低速异常体,且大部分地震都发生在该低速体上方;穿过太原盆地北部的剖面显示,该区域在20~25km深度范围内有较密集的地震分布,并勾画出交城断裂呈犁形的断层特征;穿过太原盆地中部的剖面显示,太原盆地自西向东沉积层逐渐减薄;穿过临汾盆地的剖面揭示,汾东断裂在浅部倾角较陡,随深度增加倾角逐渐变小,倾向向东.

关键词：太原盆地双差层析成像速度结构地震定位

2009年姚安地震序列定位及震源区三维P波速度结构研究

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地震学报 2011年第2期33卷 123-133,270页

作者：王长在吴建平房立华王未来中国地震局地球物理研究所中国北京100081

利用2009年7月9日姚安MS6.0地震序列的到时数据,应用双差层析成像方法,对地震进行了重定位,并反演了震源区的三维速度结构.经过资料选取,共有873次余震事件参加了反演.重定位结果显示,姚安地震余震序列呈WNW向条带状分布,大部分地震的... 详细信息

利用2009年7月9日姚安MS6.0地震序列的到时数据,应用双差层析成像方法,对地震进行了重定位,并反演了震源区的三维速度结构.经过资料选取,共有873次余震事件参加了反演.重定位结果显示,姚安地震余震序列呈WNW向条带状分布,大部分地震的震源深度集中在3—12km之间.从余震的深度分布随时间的变化推测,姚安MS6.0地震震源区的应力分布经过3次调整,开始的40个小时,应力从下向上调整;随后的20个小时,余震散布在3—23km深度范围内,应力在较大深度范围内调整;从第60个小时之后,12km以下的应力调整结束,主要是浅部应力释放.三维速度结构结果表明,姚安主震发生在低速体与高速体的过渡区域,余震主要分布在高低速过渡带及高速体一侧.结合重定位结果,推测在这一高低速过渡带附近存在隐伏断层,走向大约为N65°W.

关键词：姚安余震双差层析成像地震定位地壳结构

中国东北地区上地幔远震P波方位各向异性层析成像研究

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地球物理学报 2021年第6期64卷 1907-1924页

作者：贾若吴建平王长在张羽张龙中国地震局地球物理研究所北京100081 吉林省地震局长春130000

采用NECESSArray流动地震台阵2009—2011年期间纪录的154个远震波形资料,使用考虑各向异性的走时层析成像方法获得了中国东北地区上地幔三维P波速度扰动和方位各向异性图像.结果显示,东北地区上地幔P波速度扰动和方位各向异性均存在明... 详细信息

采用NECESSArray流动地震台阵2009—2011年期间纪录的154个远震波形资料,使用考虑各向异性的走时层析成像方法获得了中国东北地区上地幔三维P波速度扰动和方位各向异性图像.结果显示,东北地区上地幔P波速度扰动和方位各向异性均存在明显的横向不均匀性.阿尔山火山区下方存在深至地幔转换带的柱状低速异常,可能暗示存在来自深部的岩浆运移通道;410 km以下,阿尔山地区下方低速异常与松辽盆地下方低速异常汇合,同时各向异性快波速度方向FVD整体为NW向分布,表明二者可能具有共同的深部热源补给.在松辽盆地下方100 km,盆地南侧及中部地区FVD呈近E-W向展布,东侧则呈NE-SW向展布,推测可能受到E-W走向的华北克拉通—松嫩地块拼合带及NE向深大断裂的共同影响;410 km以下,FVD整体以NW向分布为主,与SKS结果类似,可能表明SKS各向异性的来源深度较深,推测其形成机制与太平板块西向俯冲有关.长白山火山区下方200 km内FVD展布与块体拼合带走向一致,反映了拼合过程对局部构造变形的影响;300 km以下显示出一致的NW向特征,推断与太平洋板块的西向俯冲有关;520~660 km内火山区西北方存在一个低速异常区,但方位各向异性幅值较大,整体趋势一致,初步推测与来自深部的地幔热柱关系不大,可能与滞留板块的深部脱水作用有关.

关键词：中国东北各向异性远震层析成像板块俯冲

基于小震定位与震源机制解信息的阿尔金断裂带东段构造转换研究

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地球物理学报 2018年第11期61卷 4459-4474页

作者：刘亢李海兵王长在张辉肖根如李红光张凌中国地震应急搜救中心北京100049 自然资源部深地动力学重点实验室中国地质科学院地质研究所北京100037 中国地震局地球物理研究所北京100081 中国地震局兰州地震研究所兰州730000 东华理工大学江西省数字国土重点实验室南昌330013

阿尔金断裂带东段地区的造转换及其动力学机制研究一直是地学工作者关注的焦点.本文利用双差定位法获取研究区域2008—2017年间6013次地震事件的精确定位数据;整理筛选前人震源机制解36个,并采用P/S波振幅比方法计算获得221个以及CAP方... 详细信息

阿尔金断裂带东段地区的造转换及其动力学机制研究一直是地学工作者关注的焦点.本文利用双差定位法获取研究区域2008—2017年间6013次地震事件的精确定位数据;整理筛选前人震源机制解36个,并采用P/S波振幅比方法计算获得221个以及CAP方法获得25个震源机制解信息.选择野马河—大雪山断裂作为研究区构造转换研究的突破口,综合小震定位数据与震源机制解信息,并开展野外地质调查进行验证,清晰刻画出该断裂的深部构造形态以及现今的运动特征:由阿尔金断裂带向祁连山方向过渡,断层产状由近直立逐渐转变为倾向南,倾角变缓,震源机制解由走滑性质为主转变为逆冲性质为主,是一个连续渐变的过程,为研究区的构造转换研究提供了直接证据.

关键词：阿尔金断裂带祁连山断裂带小震重新定位震源机制解构造转换