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Seismotectonics of the Taiwan Shoal Region in the Northeastern South China Sea:Insights from the Crustal Structure

Journal of Ocean University of China 2018年第1期17卷 156-168页

作者： WAN Kuiyuan SUN Jinlong xu huilong XIE Xiaoling XIA Shaohong ZHANG Xiang CAO Jinghe ZHAO Fang FAN Chaoyan CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China University of Chinese Academy of Sciences Beijing 100049China Earthquake Administration of Hainan Province Haikou 570203China Earthquake Administration of Guangdong Province Guangzhou 510070China

A cluster of earthquakes occurred in the Taiwan Shoal region on the outer rise of the Manila Trench. Although most were of small to medium magnitudes, one strong earthquake occurred on September 16, 1994. Several previous studies have provided important information to progress our understanding of this single earthquake. However, little is currently known about the earthquake cluster, and it is necessary to investigate the deep crustal structure of the Taiwan Shoal region to understand the mechanisms involved in controlling and generating it. This study presents a two-dimensional seismic tomographic image of the crustal structure along the OBS2012 profile based on ocean-bottom seismograph(OBS) data, which exhibits a high-velocity anomaly flanked by low-velocity anomalies in the upper crust beneath the Taiwan Shoal. In this study, 765 earthquakes(Richter magnitude ML > 1.5) occurring between 1991 and 2015 were studied and analyses of earthquake epicenters, regional faults, and the crustal structure provides an improved understanding of the nature of active tectonics in this region. Results of analyses indicate firstly that the high-velocity area represents major asperities that correspond to the location of the earthquake cluster and where stress is concentrated. It is also depicted that the earthquake cluster was influenced by fault interactions. However, the September 1994 earthquake occurred independently of these seismic activities and was associated with reactivation of a preexisting fault. It is also determined that slab pull is resisted by the exposed precollision accretionary prism, and the resistive force is causing accumulation of inplane compressive-stress. This may trigger a future damaging earthquake in the Taiwan Shoal region.

关键词： earthquake cluster crustal structure fault interactions outer rise Taiwan Shoal

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The application of large volume airgun sources to the onshore-offshore seismic surveys: implication of the experimental results in northern South China Sea

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Chinese Science Bulletin 2007年第4期52卷 553-560页

作者： QIU xueLin CHEN Yong ZHU RiXiang xu huilong SHI XiaoBin YE ChunMing ZHAO MingHui XIA ShaoHong CAS Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China Institute of Geophysics China Earthquake Administration Beijing 100081 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Earthquake Administration of Guangdong Province Guangzhou 510070 China

Onshore-offshore seismic experiments were carried out for the first time in northern South China Sea using large volume airgun sources at sea and seismic stations on land. The experimental results indicate that seismic signals from the new airgun array of R/V Shiyan 2 can be detected as far as 255 km. The signal effective area reaches nearly 50000 km2, which covers Hong Kong and Pearl River Delta. Compared with the old airgun array, the signal amplitude, propagation distance and effective area of the new airgun array have been increased notably, which demonstrates that the upgrade of the airgun source was successful. Comparisons with previous experimental results in other regions show that the shooting effect of the new airgun array is similar to those best airgun sources in the world. Especially, it is a new breakthrough in using the permanent seismic stations onshore to record long distance airgun signals offshore, which has great significance to the realization of the "seismic radar" concept and the 3D seismic surveys of crustal structure in coastal areas.

关键词：南海北部海上地震台海岸地震台大容量气枪震源人工地震地震勘探应用地壳结构

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Identification and analysis of shear waves recorded by three-component OBSs in northeastern South China Sea

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Progress in Natural Science:Materials International 2008年第2期18卷 181-188页

作者： Minghui Zhao ,xuelin Qiu,Shaohong Xia,Ping Wang,Kanyuan Xia,huilong xu Key Laboratory of Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China

Structure models associated with P-and S-wave velocities contain considerable amount of information on lithology and geophysical properties,which can be used to better understand the complexity of the deep crustal structure. However,records of converted shear waves are less due to the speciality of seismic survey at sea and the rigorous generated conditions. The study on shear waves has always been a weakness for studying the deep crustal structures of South China Sea (SCS). In this paper,eleven three-component OBSs were deployed along the Profile OBS-2001 in northeastern SCS. After the data processing of polarization and band-pass filter,converted S-wave phases were identified in the radical component records of nine OBSs. Taking the OBS7 as an example,identification and analysis of converted shear waves were presented and discussed in detail. A few phase groups,such as PwSc,PgSs,PnSc,PmS,and PwSn,were found coming from the deep crust or Moho interface by simple theoretical model calculation and ray-tracing simulation. The results not only provide the underlying basis for studies of S-wave velocity structure and Poisson’s ratio structure,but also reveal the relationship between crustal petrology and seismology,which will be of importance for making full use of S-wave information in the future.

关键词： Converted shear wave Deep crustal structure Three-component ocean bottom seismometer Northeastern South China Sea

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EARTHQUAKE FOCAL MECHANISM AND ITS TECTONIC SIGNIFICANCE ALONG THE TWO SIDES OF THE RED RIVER FAULT ZONE

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Geotectonica et Metallogenia 2004年第1期28卷 79-92页

作者： ZHU Junjiang ZHAN Wenhuan QIU xuelin xu huilong TANG Cheng Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology & Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou GD 510301 China Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology & Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou GD 510301 China Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology & Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou GD 510301 China Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology & Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou GD 510301 China Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology & Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou GD 510301 China

The Red River Fault Zone is a gigantic slide-slip fault zone extending up to 1000km from Tibet to SouthChina Sea. It has been divided into the north, central and south segments according to the difference of thegeometry, kinetics, and seismicity on the land, but according to the contacted relationship between the old pre-Cenozoic block in Indochina Peninsula and the South China block, the Red River Fault Zone was divided into two parts extending from land to ocean, the north and south segments. Since the Tertiary, the Red River Fault Zone suffered first the sinistral movement and then the dextral movement. The activities of the north and the south segments were different. Based on the analysis of earthquakes and focal mechanism solutions,earthquakes with the focus depths of 0-33km are distributed over the whole region and more deep earthquakes are distributed on the northeastern sides of the Red River fault. Types of faulting activities are the thrust in the northwest, the normal in the north and the strike-slip in the south, with the odd type, viz. the transition type, in the other region. These show the Red River Fault Zone and its adjacent region suffered the extruding force in NNW direction and the normal stress in NEE direction and it makes the fault in the region extrude-thrust,horizontal strike-slip and extensional normal movement.

关键词： The Red River Fault Zone (RRFZ) Focal mechanism solutions Dextral movement Seismicactivity

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Large-scale Fault and Serpentinization in the Southern Margin of the South China Sea: Evidence from multi-channel and wide-angle seismic data

Large-scale Fault and Serpentinization in the Southern Margi...

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2020年中国地球科学联合学术年会

作者： Wan Kuiyuan Xia Shaohong xu huilong Cao Jinghe Fan Chaoyan South China Sea Institute of Oceanology Chinese Academy of Sciences Innovation Academy of South China Sea Ecology and Environmental Engineering Chinese Academy of Sciences Southern Marine Science and Engineering Guangdong Laboratory Guangzhou

In recent years, our research on the South China Sea(SCS) is focusing on the southern margin. The southern margin formed by the extension and rupture of the southwest subbasin and the formation time is obviously later... 详细信息

关键词： Evidence from multi-channel and wide-angle seismic data Large-scale Fault and Serpentinization in the Southern Margin of the South China Sea Southern

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Distribution and identification of the low-velocity layer in the northern South China Sea

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Progress in Natural Science:Materials International 2007年第5期17卷 591-600页

作者： Zhao Minghui, Qiu xuelin, xu huilong, Shi Xiaobin, Wu Shimin , Ye Chunming and Xia Shaohong (Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China Earthquake Administration of Guangdong Province, Guangzhou 510070, China) Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China Earthquake Administration of Guangdong Province Guangzhou 510070 China

The low-velocity layer (LVL), closely related with tectonic activities and dynamic settings, has always been a hot topic in the deep crustal structure studies. The deep seismic (OBS/OBH) and onshore-offshore experiments have been extensively implemented in the northern South China Sea (SCS) since the 1990s. Six seismic profiles were finished on the northern margin of SCS by domestic and international cooperations. The features of crustal structures were revealed and five velocity-inversion layers were discovered. Among them three LVLs with 3.0—3. 5 km·s-1 velocity are located in the sedimentary structure (2.0—6.0 km in depth and 2.0—4. 6 km in thickness) of the Yinggehai Basin and Pearl River Mouth Basin. They were identified by the reflective and refractive phases for their shallow depth. The other two LVLs with 5.5—6.0 km·s-1 velocity generally existed in the middle crust (7.0—18.0 km in depth) with an about 2.5—6.0 km thickness in the transitional crustal structure of the northeastern and northwestern SCS. They were detected by the refractive phase from their overlain and underlying layers. We explored the possible tectonic formation mechanisms combining with previously reported results, which provided evidence for the formation and evolution of SCS.

关键词： low-velocity layer deep crustal structure the northern South China Sea OBS/OBH and onshore-offshore seismic experiments.

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1995年日本新泻北部M6.0地震及其由地震烈度和地下水地热异常分布所揭示的隐伏地震断层(英文)

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华南地震 2003年第4期23卷 24-36页

作者：徐辉龙中国科学院南海海洋研究所和地球化学研究所边缘海地质重点实验室广东广州510301

1995年日本新泻北部M6 0地震发生在新泻地震空区的东部边缘。由于此次地震震源较浅 ( 10km) ,造成了 55栋房屋倒塌、 16 5栋房屋半倒。通过计算倾倒墓碑的地震矩 ,对本区地震烈度进行了分析 ,发现烈度 6度区 (据日本JMA度 )为一覆盖面... 详细信息

1995年日本新泻北部M6 0地震发生在新泻地震空区的东部边缘。由于此次地震震源较浅 ( 10km) ,造成了 55栋房屋倒塌、 16 5栋房屋半倒。通过计算倾倒墓碑的地震矩 ,对本区地震烈度进行了分析 ,发现烈度 6度区 (据日本JMA度 )为一覆盖面积 6 1× 1km2 ,呈NNE -SSW向分布的条带 ,表明震中区的冲积平原下存在一条隐伏断层。震中区地下水的温度、电导率和Cl-浓度等异常区与呈线性分布的 6度烈度区大致吻合 ,也有力地证明了震中区下面存在一条隐伏断层。这次地震可能是由高压型热水系沿隐伏活动断层喷溢引起。带着高温的高压热水降低了岩石的断裂强度 ,从而触发了地震。

关键词：隐伏活动断层地下水异常地压型热水系地压型热水系喷溢日本新泻北部地震震源 1995年

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中国煤炭资源分布现状和远景预测

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煤田地质与勘探 1999年第3期27卷 1-4页

作者：毛节华许惠龙中国煤田地质总局山西煤田地质局

以中国煤田地质总局组织完成的第三次全国煤田预测资料为基础，论述了中国煤炭资源的分布现状与前景。中国煤炭资源以石炭二叠纪及侏罗纪煤为主，形成北方太行山—贺兰山之间包括晋、陕、蒙、宁、豫和新疆塔里木河以北，以及南方川南、... 详细信息

以中国煤田地质总局组织完成的第三次全国煤田预测资料为基础，论述了中国煤炭资源的分布现状与前景。中国煤炭资源以石炭二叠纪及侏罗纪煤为主，形成北方太行山—贺兰山之间包括晋、陕、蒙、宁、豫和新疆塔里木河以北，以及南方川南、黔西、滇东富煤区；但煤类分布极不平衡。通过对地域分布、埋深、煤类等方面因素具体分析后认为，近期可供进一步找煤、普查的工作对象仅占６．４％；煤炭资源赋存比较丰富的省（区）潜力较大，而煤炭资源较缺地区则潜力甚小，南方经济发达的省（区）基本无找煤普查前景。以上研究，为中国在２１世纪进行煤炭工业发展规划研究提供了资源依据。

关键词：煤炭资源量分布现状远景预测中国煤矿床

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多角度倾斜光调制下的相位恢复技术

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华南理工大学学报（自然科学版） 2018年第8期46卷 142-150页

作者：程鸿邓会龙徐姗姗高要利韦穗安徽大学计算智能与信号处理教育部重点实验室安徽合肥230039 陆军炮兵防空兵学院十一系安徽合肥230031

基于强度传输方程的非干涉相位恢复技术可以通过求解方程从强度测量中计算出丢失的相位信息.但在实际成像中,成像系统中透镜孔径的限制会对恢复相位的分辨率产生一定的影响.为此,文中将倾斜光照的思想引入到基于强度传输方程的相位恢复... 详细信息

基于强度传输方程的非干涉相位恢复技术可以通过求解方程从强度测量中计算出丢失的相位信息.但在实际成像中,成像系统中透镜孔径的限制会对恢复相位的分辨率产生一定的影响.为此,文中将倾斜光照的思想引入到基于强度传输方程的相位恢复中,在空间光调制器上加载调制函数,将平面波以不同的波矢倾斜入射到物体上,使透镜孔径的通带覆盖不同的频率空间.对这些通带所覆盖的场进行求和,从而获得具有更大通带的合成场,以提高系统在高频领域的成像能力.分别构建了基于4f和单透镜的多角度倾斜光调制系统,并由系统采集的强度图像结合强度传输方程求解出相位结果.实验结果表明,文中提出的方法在有效提高恢复相位分辨率的同时保证了恢复相位的精度.

关键词：分辨率相位恢复强度传输方程空间光调制器倾斜光照

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南海东部海沟的震源机制解及其构造意义

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地震学报 2005年第3期27卷 260-268页

作者：朱俊江丘学林詹文欢徐辉龙孙龙涛中国科学院边缘海地质重点实验室

根据马尼拉海沟及邻区地震、火山活动的分析,并结合地震震源机制和地球物理资料分析,发现马尼拉海沟在深度200多公里仍为俯冲的性质,深地震主要集中在12°N～14°N之间,地震密集区出现明显的分段特征,从北到南深度逐渐变深.震源机制解... 详细信息

根据马尼拉海沟及邻区地震、火山活动的分析,并结合地震震源机制和地球物理资料分析,发现马尼拉海沟在深度200多公里仍为俯冲的性质,深地震主要集中在12°N～14°N之间,地震密集区出现明显的分段特征,从北到南深度逐渐变深.震源机制解所反映的最大主压应力轴(P轴)以菲律宾大断层为界,北部主要为NW向;南部较为复杂,为NW,NE和近NS向.显示了北部以挤压逆冲为特征,南部以顺时针旋转为特征.菲律宾板块向西仰冲所产生的构造应力,被马尼拉海沟的斜向俯冲,菲律宾大断层的左旋走滑,以及民都洛断层的左旋走滑所调节.

关键词：马尼拉海沟震源机制地震和火山活动

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