检索结果-南通市图书馆

Tomographic inversion of OBS converted shear waves:case study of profile EW6 in the Dongsha area

Acta Oceanologica Sinica 2024年第8期43卷 13-25页

作者： Genggeng Wen kuiyuan wan Shaohong Xia Xiuwei Ye Huilong Xu Chaoyan Fan Jinghe Cao Shunshan Xu CEA Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Guangdong Earthquake AgencyGuangzhou 510070China Guangdong Science and Technology Collaborative Innovation Center for Earthquake Prevention and Disaster Mitigation Guangzhou 510070China MOE Key Laboratory of Disaster Forecast and Control in Engineering-Urban Earthquake Safety Laboratory Guangzhou 510070China CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China 6 Centro de Geociencias Universidad Nacional Autónoma de MéxicoQuerétaroC.P.76230Mexico

Studies of converted S-wave data recorded on the ocean bottom seismometer(OBS)allow for the estimation of crustal S-wave velocity,from which is further derived the Vp/Vs ratio to constrain the crustal lithology and geophysical *** a precise S-wave velocity model is important for deep structural research,and inversion of converted S-waves provides a potential ***,the inversion of the converted S-wave remains a weakness because of the complexity of the seismic ray path and the inconsistent conversion *** this study,we introduced two travel time correction methods for the S-wave velocity inversion and imaged different S-wave velocity structures in accordance with the corresponding corrected S-wave phases using seismic data of profile EW6 in the northeastern South China Sea(SCS).The two inversion models show a similar trend in velocities,and the velocity difference is<0.15 km/s(mostly in the range of 0–0.1 km/s),indicating the accuracy of the two travel time correction methods and the reliability of the inversion *** to simulations of seismic ray tracing based on different models,the velocity of sediments is the primary influencing factor in ray tracing for S-wave *** the sedimentary layer has high velocities,the near offset crustal S-wave refractions cannot be *** contrast,the ray tracing of Moho S-wave reflections was not significantly impacted by the velocity of the *** two travel time correction methods have their own advantages,and the application of different approaches is based on additional *** works provide an important reference for future improvements in converted S-wave research.

关键词： converted S-wave S-wave velocity structure inversion ocean bottom seismometer northeastern South China Sea

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tomographic inversion of OBS converted shear waves:case study of profile EW6 in the Dongsha area

引用

Acta Oceanologica Sinica 2024年第08期 13-25页

作者： Genggeng Wen kuiyuan wan Shaohong Xia Xiuwei Ye Huilong Xu Chaoyan Fan Jinghe Cao Shunshan Xu CEA Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Guangdong Earthquake Agency Guangdong Science and Technology Collaborative Innovation Center for Earthquake Prevention and Disaster Mitigation MOE Key Laboratory of Disaster Forecast and Control in Engineering-Urban Earthquake Safety Laboratory CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) Centro de Geociencias Universidad Nacional Autónoma de México

Studies of converted S-wave data recorded on the ocean bottom seismometer(OBS) allow for the estimation of crustal S-wave velocity, from which is further derived the Vp/Vs ratio to constrain the crustal lithology and geophysical properties. Constructing a precise S-wave velocity model is important for deep structural research,and inversion of converted S-waves provides a potential solution. However, the inversion of the converted S-wave remains a weakness because of the complexity of the seismic ray path and the inconsistent conversion *** this study, we introduced two travel time correction methods for the S-wave velocity inversion and imaged different S-wave velocity structures in accordance with the corresponding corrected S-wave phases using seismic data of profile EW6 in the northeastern South China Sea(SCS). The two inversion models show a similar trend in velocities, and the velocity difference is <0.15 km/s(mostly in the range of 0–0.1 km/s), indicating the accuracy of the two travel time correction methods and the reliability of the inversion results. According to simulations of seismic ray tracing based on different models, the velocity of sediments is the primary influencing factor in ray tracing for S-wave phases. If the sedimentary layer has high velocities, the near offset crustal S-wave refractions cannot be traced. In contrast, the ray tracing of Moho S-wave reflections was not significantly impacted by the velocity of the sediments. The two travel time correction methods have their own advantages, and the application of different approaches is based on additional requirements. These works provide an important reference for future improvements in converted S-wave research.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Offshore Fault Geometrics in the Pearl River Estuary,Southeastern China:Evidence from Seismic Reflection Data

引用

Journal of Ocean University of China 2018年第4期17卷 799-810页

作者： CAO Jinghe XIA Shaohong SUN Jinlong ZHAO Fang wan kuiyuan XU Huilong CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesCruangzhou 510301China University of Chinese Academy of Sciences Beijing 100049China

The Pearl River Estuary(PRE) is located at the onshore-offshore transition zone between South China and South China Sea Basin, and it is of great significant value in discussing tectonic relationships between South China block and South China Sea block and seismic activities along the offshore active faults in PRE. However, the researches on geometric characteristics of offshore faults in this area are extremely lacking. To investigate the offshore fault distribution and their geometric features in the PRE in greater detail, we acquired thirteen seismic reflection profiles in 2015. Combining the analysis of the seismic reflection and free-air gravity anomaly data, this paper revealed the location, continuity, and geometry of the littoral fault zone and other offshore faults in PRE. The littoral fault zone is composed of the major Dangan Islands fault and several parallel, high-angle, normal faults, which mainly trend northeast to northeast-to-east and dip to the southeast with large displacements. The fault zone is divided into three different segments by the northwest-trending faults. Moreover, the basement depth around Dangan Islands is very shallow, while it suddenly increases along the islands westward and southward. These has resulted in the islands and neighboring areas becoming the places where the stress accumulates easily. The seismogenic pattern of this area is closely related to the comprehensive effect of intersecting faults together with the low velocity layer.

关键词： offshore active faults littoral fault zone Pearl River Estuary earthquake seismic reflection data

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Seismogenic Structures of the 2006 ML4.0 Dangan Island Earthquake Offshore Hong Kong

引用

Journal of Ocean University of China 2018年第1期17卷 169-176页

作者： XIA Shaohong CAO Jinghe SUN Jinlong LV Jinshui XU Huilong ZHANG Xiang wan kuiyuan FAN Chaoyan ZHOU Pengxiang CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Seismological Bureau of Guangdong Province Guangzhou 510070China University of Chinese Academy of Sciences Beijing 100049China

The northern margin of the South China Sea, as a typical extensional continental margin, has relatively strong intraplate seismicity. Compared with the active zones of Nanao Island, Yangjiang, and Heyuan, seismicity in the Pearl River Estuary is relatively low. However, a ML4.0 earthquake in 2006 occurred near Dangan Island(DI) offshore Hong Kong, and this site was adjacent to the source of the historical M5.8 earthquake in 1874. To reveal the seismogenic mechanism of intraplate earthquakes in DI, we systematically analyzed the structural characteristics in the source area of the 2006 DI earthquake using integrated 24-channel seismic profiles, onshore–offshore wide-angle seismic tomography, and natural earthquake parameters. We ascertained the locations of NW-and NE-trending faults in the DI sea and found that the NE-trending DI fault mainly dipped southeast at a high angle and cut through the crust with an obvious low-velocity anomaly. The NW-trending fault dipped southwest with a similar high angle. The 2006 DI earthquake was adjacent to the intersection of the NE-and NW-trending faults, which suggested that the intersection of the two faults with different strikes could provide a favorable condition for the generation and triggering of intraplate earthquakes. Crustal velocity model showed that the high-velocity anomaly was imaged in the west of DI, but a distinct entity with low-velocity anomaly in the upper crust and high-velocity anomaly in the lower crust was found in the south of DI. Both the 1874 and 2006 DI earthquakes occurred along the edge of the distinct entity. Two vertical cross-sections nearly perpendicular to the strikes of the intersecting faults revealed good spatial correlations between the 2006 DI earthquake and the low to high speed transition in the distinct entity. This result indicated that the transitional zone might be a weakly structural body that can store strain energy and release it as a brittle failure, resulting in an earthquake-pron

关键词： Dangan Island intraplate seismicity South China Sea crustal velocity model seismogenic structure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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...

引用

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

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

梅州市某市政道路下穿隧道中清水混凝土施工技术分析

引用

工程技术研究 2023年第1期8卷 34-37页

作者：万魁元广东长正建设有限公司广东珠海519000

清水混凝土施工技术可以保证混凝土颜色均匀一致、美观,外露面不用再进行装饰设计,可以节约工程造价,逐渐在市政道路工程推广应用,但是清水混凝土施工对技术管理水平要求较高,外观目标不易实现。文章结合梅州市某市政道路下穿隧道清水... 详细信息

清水混凝土施工技术可以保证混凝土颜色均匀一致、美观,外露面不用再进行装饰设计,可以节约工程造价,逐渐在市政道路工程推广应用,但是清水混凝土施工对技术管理水平要求较高,外观目标不易实现。文章结合梅州市某市政道路下穿隧道清水混凝土实际应用情况,通过选择均匀、优质的混凝土原材料,多次适配后根据混凝土外观色泽优选参数组合,采用几字型钢加强模板支撑体系及细部连接,一次性充足备料,延长混凝土拌和时间,加强浇筑过程中控制及后期养护等一系列施工管理措施,解决了混凝土外露面色泽不均匀、表面不平整、接缝错台、气泡、砂线等技术问题,通过实践,实现了该项目隧道主体结构清水混凝土的建设目标。

关键词：清水混凝土市政隧道模板体系脱模剂保护层垫块

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

主动源海底地震仪记录数据的时间问题及原因分析

引用

地震学报 2023年第3期45卷 550-567页

作者：白琨琳范朝焰万奎元张成龙夏少红中国科学院边缘海与大洋地质重点实验室中国科学院南海海洋研究所广州510301 南方海洋科学与工程广东省实验室(广州) 广州511458 中国科学院大学北京100049

简要概括了国产主动源海底地震仪(OBS)数据处理中常见的时间异常现象,以OBS2020-1测线的实际处理为主并结合了OBS处理中对数据异常校正取得的部分进展为实例,通过检查数据记录格式、计算相邻数据文件间的时间差、对比不同处理方法所得... 详细信息

简要概括了国产主动源海底地震仪(OBS)数据处理中常见的时间异常现象,以OBS2020-1测线的实际处理为主并结合了OBS处理中对数据异常校正取得的部分进展为实例,通过检查数据记录格式、计算相邻数据文件间的时间差、对比不同处理方法所得剖面、分析初始时间和采样时间是否异常、使用数据重采样等手段,对OBS时间异常问题进行了分类处理和校正。分析显示,国产OBS在数据记录中普遍存在的时间问题大部分均能解决,通过本文提供的方法可以避免处理不当所导致的OBS地震剖面出现同相轴“断阶”、“倾斜”,甚至“缺失”等现象,确保了有效震相的完整性,有效解决了OBS数据时间异常问题,提高了数据的质量和利用率,为后续开展走时层析成像奠定了良好的基础,并为今后主动源OBS数据处理流程和方法提供了借鉴。

关键词：海底地震仪(OBS) 时间异常震相采样间隔数据处理

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

珠江口外海域滨海断裂带沿构造走向的变化特征

引用

地球科学 2018年第10期43卷 3682-3697页

作者：熊成曹敬贺孙金龙夏少红万奎元范朝焰杨碧峰中国科学院边缘海与大洋地质重点实验室中国科学院南海海洋研究所广东广州510301 中国科学院大学北京100049

珠江口外海域滨海断裂带是南海北部陆缘重要的控震和发震构造,其研究关系到区域防震抗震、地壳稳定性评价及对南海构造演化的认识.为探明滨海断裂带沿构造走向上的变化特征,对2015年珠江口海陆联测数据进行了处理,使用射线追踪、走时模... 详细信息

珠江口外海域滨海断裂带是南海北部陆缘重要的控震和发震构造,其研究关系到区域防震抗震、地壳稳定性评价及对南海构造演化的认识.为探明滨海断裂带沿构造走向上的变化特征,对2015年珠江口海陆联测数据进行了处理,使用射线追踪、走时模拟等方法,获得了珠江口西侧的地壳纵波速度结构模型和滨海断裂带在珠江口地区的发育位置和构造形态等信息.结果显示,珠江口西侧滨海断裂带总体倾向SE,向下可能延伸至莫霍面;沉积层在断裂带陆侧较薄,在滨海断裂带处突然增厚;断裂带内地壳速度为5.3～6.7 km/s,相对两侧地壳表现出低速特征;莫霍面的埋深由断裂带陆侧的28.5 km抬升至其海侧的24.5 km;海陆两侧的地壳结构具有明显的非均一性.对比前人在珠江口东侧的研究成果,珠江口外滨海断裂带总体形态特征相似,但也表现出明显的差异,自东向西,断裂带内部的结构形态从简单变得复杂,逐渐发育明显的阶梯状断层;北界断裂从断距很大的陡崖式正断层逐渐转变为断距较小的低角度正断层,且北界断裂的位置向北错动了一段距离,断裂带内的低速异常则逐渐变弱.本研究不但可以加深对滨海断裂带浅、深部结构的认识,而且还能为研究南海北部陆缘的发震构造提供参考.

关键词：珠江口滨海断裂带地壳结构深地震探测地球物理

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

OBS广角地震探测在海洋沉积盆地研究中的作用

引用

地球科学进展 2016年第11期31卷 1111-1124页

作者：夏少红曹敬贺万奎元范朝焰孙金龙中国科学院边缘海地质重点实验室中国科学院南海海洋研究所广东广州510301 中国科学院大学北京100049

海洋沉积盆地是地球系统中重要的构造单元之一,其形成演化涉及到壳—幔、岩石圈—软流圈以及沉积地层和沉积流体体系等一系列深浅部耦合作用和地球动力学机制的演变。海洋沉积盆地的研究既包括地球深部结构状态、物质组成和构造演化等... 详细信息

海洋沉积盆地是地球系统中重要的构造单元之一,其形成演化涉及到壳—幔、岩石圈—软流圈以及沉积地层和沉积流体体系等一系列深浅部耦合作用和地球动力学机制的演变。海洋沉积盆地的研究既包括地球深部结构状态、物质组成和构造演化等区域构造方面,也包括盆地内部结构、构造特征以及沉积地层孔隙流体特征等盆地自身构造特征。海底地震仪(Ocean Bottom Seismometer,OBS)广角地震探测,以其深度上穿透能力强和能够同时获取P波和S波速度结构等方面的优势,近年来在海洋沉积盆地区域构造演化、内部结构与构造以及沉积地层孔隙流体发育特征等研究中发挥了越来越重要的作用。在张裂大陆边缘的研究中,OBS广角地震探测所获取的地壳结构模型为划分"火山型"和"非火山型"张裂陆缘提供了直接证据,地壳拉张减薄的程度和空间变化特征为海洋沉积盆地构造演化的动力学模拟提供了约束条件。在盆地内部结构和构造特征方面,OBS深地震探测对盆地内部的盐体构造、岩浆底辟构造等提供了有效成像,并获取了盆地内部超压状态的分布特征,弥补了常规多道地震在探测深度和复杂地质构造背景等方面的缺陷。在海洋沉积盆地内部流体体系的研究方面,OBS深地震探测揭示了天然气水合物储集区的速度结构,进而计算获取了储集区的厚度以及水合物和游离气体在孔隙中的含量。当然,随着OBS地震探测技术的发展、数据处理能力的提高以及仪器设备参数的改善等,未来OBS广角地震探测在海洋沉积盆地动力学演化过程和机制方面的研究中将继续发挥更大更广泛的作用。

关键词：海底地震仪海洋沉积盆地张裂陆缘天然气水合物岩浆

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：