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A multi-scale 3-D crust velocity model in the Hefei-Chao Lake area around the southern segment of Tanlu Fault Zone

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Earthquake Science 2021年第4期34卷 344-357页

作者： Lingli Li huajian yao Song Luo Junhui Li Xiaoli Wang Hongyu Ni Ziwen Bao Anhui Earthquake Agency Hefei 230031China Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Anhui Mengcheng National Geophysical Observatory Mengcheng 233500China

Regional high-precision velocity models of the crust are an important foundation for examining seismic activity,seismogenic environments,and disaster distribution *** Hefei-Chao Lake area contains the main geological units of Hefei Basin,with thick sediments and the Chao Lake *** major concealed faults of the southern NNE-trending Tanlu Fault Zone cross this *** further explore the underground distribution characteristics of the faults and their tectonic evolutionary relationship with adjacent tectonic units,this study used ambient noise data recorded by a seismic array deployed in Hefei City and Chao Lake,constructing a 3-D velocity model at the depth of 1–8 *** a multi-scale high-resolution 3-D velocity model of this area was constructed by this new upper crustal velocity model with the previous middle and lower crustal *** new model reveals that a high-velocity belt is highly consistent with the strike of the Tanlu Fault Zone,and a low-velocity sedimentary characteristic is consistent with the Hefei Basin and Chao Lake *** distribution morphology of high and low velocity bodies shows that the sedimentary pattern of Hefei-Chao Lake area is closely related to the tectonic evolution of the Tanlu Fault Zone since the *** study also identifies multiple low-velocity anomalies in the southeastern Hefei *** speculate that strong ground motion during the 2009 Feidong earthquake(magnitude of 3.5)was related to amplification by the thick sediments in the Hefei *** also discuss further applications of multi-scale high-resolution models of the shallow layer to strong ground motion simulations in cities and for earthquake disaster assessments.

关键词： Tanlu Fault Zone Hefei-Chao Lake area crust multi-scale velocity model

Preliminary analysis on the source properties and seismogenic structure of the 2017 M_s7.0 Jiuzhaigou earthquake

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Science China Earth Sciences 2018年第3期61卷 339-352页

作者： Zujun XIE Yong ZHENG huajian yao Lihua FANG Yong ZHANG Chengli LIU Maomao WANG Bin SHAN Huiping ZHANG Junjie REN Lingyun JI Meiqin SONG Hubei Subsurface Multi-scale Imaging Key Laboratory Institute of Geophysics and Geomatics China University of Geosciences State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and Geophysics Chinese Academy of Sciences Laboratory of Seismology and Physics of Earth's Interior School of Earth and Space Sciences University of Science and Technology of China Institute of Geophysics China Earthquake Administration School of Earth and Space Sciences Peking University College of Oceanography Hohai University State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake Administration Key Laboratory of Crustal Dynamics Institute of Crustal DynamicsChina Earthquake Administration Second Crust Monitoring and Application Center China Earthquake Administration National Scientific Field Observatory of Continental Rift Dynamics in Taiyuan Shanxi Seismic Bureau

At GMT time 13：19, August 8, 2017, an M1.0 earthquake struck the Jiuzhaigou region in Sichuan Province, China, causing severe damages and casualties. To investigate the source properties, seismogenic structures, and seismic hazards, we systematically analyzed the tectonic environment, crustal velocity structure in the source region, source parameters and rupture process, Coulomb failure stress changes, and 3-D features of the rupture plane of the Jiuzhaigou earthquake. Our results indicate the following：（1） The Jiuzhaigou earthquake occurred on an unmarked fault belonging to the transition zone of the east Kunlun fault system and is located northwest of the Huya fault. （2） Both the mainshock and aftershock rupture zones are located in a region where crustal seismic velocity changes dramatically. Southeast to the source region, shear wave velocity at the middle to lower crust is significantly low, but it rapidly increases northeastward and lies close to the background velocity across the rupture fault. （3） The aftershock zone is narrow and distributes along the northwest-southeast trend, and most aftershocks occur within a depth range of 5-20 km. （4） The focal mechanism of the Jiuzhaigou earthquake indicates a left-lateral strike-slip fault, with strike, dip, and rake angles of 152~, 74~ and 8~, respectively. The hypocenter depth measures 20 km, whereas the centroid depth is about 6 kin. The co-seismic rupture mainly concentrates at depths of 3-13 km, with a moment magnitude （Mw） of 6.5. （5） The co-seismic rupture also strengthens the Coulomb failure stress at the two ends of the rupture fault and the east segment of the Tazang fault. Aftershocks relocation results together with geological surveys indicate that the causative fault is a near vertical fault with notable spatial variations： dip angle varies within 660-89~ from northwest to southeast and the average dip angle measures -84~. The results of this work are of fundamental importance for further studies on th

关键词： Jiuzhaigou earthquake Velocity structure Source parameters Seismogenic structure Seismic hazard

Experiments on Exploration of Shallow Fine Structures and the Construction of the 1-D Velocity Model in the Pingtan Island,Fujian

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Earthquake Research in China 2019年第2期33卷 265-275页

作者： GUO Yang XU Jiajun LIN Chen JIN Xing yao huajian YANG Hongfeng CAI Huiteng Fujian Earthquake Agency Fuzhou 350003China School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China School of Earth Sciences and Engineering Nanjing UniversityNanjing 210046China Earth System Science Programme Faculty of ScienceThe Chinese University of Hong KongHong Kong 999077China

112 short-period seismographs were set up in the 400 km^2 area of Pingtan Island and its surrounding areas in *** combined observations of the airgun source and ambient noise source were carried out using a dense array to receive the 387 airgun signals excited around the island and one month of continuous ambient noise *** 1-D P-wave and S-wave shallow velocity model of Pingtan Island is obtained by the inversion of the airgun body wave’s first arrival time data,and the reliability of the velocity model is verified by using the surface wave phase velocity dispersion curve,which can provide initial model for subsequent 3-D *** experimental results show that this experiment is a successful demonstration of local scale green non-destructive detection,which can provide basic data for shallow surface structure research and strong vibration simulation of the Pingtan Island.

关键词： Pingtan Island Fujian Dense array Airgun Ambient noise 1-D velocity model

用压缩感知方法研究大地震的破裂过程——方法与研究进展

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中国科学技术大学学报 2013年第11期43卷 907-921页

作者：姚华建中国科学技术大学地球和空间科学学院地震与地球内部物理实验室蒙城地球物理国家野外科学观测研究站

通过观测方法来研究大地震的破裂过程是认识地震破裂物理规律最重要的手段之一.本文较为详细地介绍了基于稀疏反演理论的压缩感知方法及其在研究大地震破裂过程中不同频率能量释放的时空分布中的应用,着重介绍了采用压缩感知算法所获得... 详细信息

通过观测方法来研究大地震的破裂过程是认识地震破裂物理规律最重要的手段之一.本文较为详细地介绍了基于稀疏反演理论的压缩感知方法及其在研究大地震破裂过程中不同频率能量释放的时空分布中的应用,着重介绍了采用压缩感知算法所获得的俯冲带特大逆冲型地震与频率及深度相关的能量释放过程,并讨论了该过程与随深度变化的同震断层滑移量和早期余震分布之间的关系.这为认识俯冲板块表面随深度变化的摩擦性质和俯冲带大地震的破裂规律提供了重要的观测结果.最后本文讨论了通过观测手段研究大地震破裂过程的现状和未来,并展望了压缩感知算法在研究地震破裂能量释放及其他地震学和地球物理学领域中的应用.

关键词：地震破裂过程压缩感知算法地震能量释放俯冲带逆冲大地震

Constraints on crustal Vs and Poisson’s ratio from Rayleigh wave dispersion and ZH ratio data

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Constraints on crustal Vs and Poisson’s ratio from Rayleigh...

A real-time AI-assisted seismic monitoring system based on new nodal stations with 4G telemetry and its application in the Yangbi M_(S) 6.4 aftershock monitoring in southwest China

中国地球物理学会第二十九届年会

作者： huajian yao Wenhao Huang Bin Luo School of Earth and Space Sciences University of Science and Technology of China

＜正＞Surface wave dispersion measurements from either earthquake-based methods or ambient noise interferometry have been widely used to determine the crustal and upper mantle shear wavespeed （Vs） structure of the E...

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Earthquake Research Advances 2022年第2期2卷 3-10页

作者： Junlun Li huajian yao Baoshan Wang Yang Yang Xin Hu Lishu Zhang Beng Ye Jun Yang Xiaobin Li Feng Liu Guoyi Chen Chang Guo Wen Yang Laboratory of Seismology and Physics of Earth's Interior School of Earth and Space ScienceUniversity of Science and Technology of China96 Jinzhai RoadHefeiAnhui230026China Mengcheng National Geophysical Observatory University of Science and Technology of ChinaHefeiAnhui230026China Center for Advanced Geophysical Sensing and Intelligent Exploration Institute of Advanced TechnologyUniversity of Science and Technology of China96 Jinzhai RoadHefeiAnhui230026China Hefei Guowei Electronics Co.Ltd. 800 Wangjiang West RoadHefeiAnhui230088China Yunnan Earthquake Agency KunmingYunnan650224China

A rapidly deployable dense seismic monitoring system which is capable of transmitting acquired data in real time and analyzing data automatically is crucial in seismic hazard mitigation after a major ***,it is rather difficult for current seismic nodal stations to transmit data in real time for an extended period of time,and it usually takes a great amount of time to process the acquired data *** monitor earthquakes in real time flexibly,we develop a mobile integrated seismic monitoring system consisting of newly developed nodal units with 4G telemetry and a real-time AI-assisted automatic data processing *** integrated system is convenient for deployment and has been successfully applied in monitoring the aftershocks of the Yangbi M_(S) 6.4 earthquake occurred on May 21,2021 in Yangbi County,Dali,Yunnan in southwest *** acquired seismic data are transmitted almost in real time through the 4G cellular network,and then processed automat-ically for event detection,positioning,magnitude calculation and source mechanism *** tens of seconds to a couple of minutes at most,the final seismic attributes can be presented remotely to the end users through the integrated *** May 27 to June 17,the real-time system has detected and located 7905 aftershocks in the Yangbi area before the internal batteries exhausted,far more than the catalog provided by China Earthquake Networks Center using the regional permanent *** initial application of this inte-grated real-time monitoring system is promising,and we anticipate the advent of a new era for Real-time Intelligent Array Seismology(RIAS),for better monitoring and understanding the subsurface dynamic pro-cesses caused by Earth's internal forces as well as anthropogenic activities.

关键词： Seismic dense array 4G data transmission Real-time earthquake monitoring Machine-learning assisted processing Real-time intelligent array seismology

基于改进的多分量频率-贝塞尔变换法研究郯庐断裂带潍坊段上地壳径向各向异性结构

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地球物理学报 2024年第3期67卷 1037-1052页

作者：周桂理罗松姚华建中国科学技术大学地球和空间科学学院合肥230026 中国科学技术大学蒙城地球物理国家野外科学观测研究站安徽蒙城230026

郯庐断裂带潍坊段位于郯庐断裂带中部,具有复杂的地质结构,总体呈现“两堑夹一垒”的构造格局.相比于郯庐断裂带其他区域,潍坊段地震活动性较弱,属于地震空区,未来发生大地震的可能性尚不明确.前人对该地区的研究目前仅局限于速度结构... 详细信息

郯庐断裂带潍坊段位于郯庐断裂带中部,具有复杂的地质结构,总体呈现“两堑夹一垒”的构造格局.相比于郯庐断裂带其他区域,潍坊段地震活动性较弱,属于地震空区,未来发生大地震的可能性尚不明确.前人对该地区的研究目前仅局限于速度结构和方位各向异性结构,对于上地壳径向各向异性结构特征鲜有报道.因此,研究该区域上地壳速度模型和径向各向异性结构,有助于更好地认识郯庐断裂带潍坊段浅地壳(V_(SV)),这可能与早期地壳伸展沉积导致的水平变形结构有关.2~5 km,四个区域径向各向异性结构各有不同,但总体处于由负到正的转折状态.这可能因为2~5 km不仅受到断裂结构的控制作用,也受到水平沉积结构的影响,导致径向各向异性结构较为复杂.

关键词：改进的多分量频率-贝塞尔变换法径向各向异性郯庐断裂带沂沭断裂带背景噪声

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Distinct variations of crustal shear wave velocity structure and radial anisotropy beneath the North China Craton and tectonic implications

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Distinct variations of crustal shear wave velocity structure...

利用区域地震体波走时评价华北地区三维地壳速度结构模型

中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Cheng Cheng Ling Chen huajian yao Mingming Jiang Bingyu Wang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences IGPP Scripps Institute of OceanographyUCSDLa JollaCAUnited States

This study presents the crustal shear wave velocity structure and radial anisotropy along two linear seismic arrays across the North China Craton(NCC) from ambient noise *** a half to one year long ambient noise data from 87 stations were used for obtaining the inter-station surface wave empirical Green’s functions(ECFs) from *** and Love dispersion curves within the period band 5-30 s were measured from the EGFs of the vertical and transverse components,*** dispersion data were then used to determine the crustal shear wave velocity structure(V and V) and radial anisotropy (2(V - V) /(V + V)) from point-wise linear inversion with constraints from receiver function analysis. Our results reveal substantial structural variations among different parts of the *** Bohai Bay Basin in the eastern NCC is underlain by a thin crust(～30 km) with relatively low velocities(particularly V) and large positive radial anisotropy in the middle to lower *** a crustal structure is no longer of a cratonic type and may have resulted from the widespread tectonic extension and intensive magmatism in this region since late *** the Ordos Basin in the western NCC,the crust is relatively thicker(>40 km) and well stratified,and presents a large-scale low velocity zone in the middle to lower crust and overall weak radial anisotropy except for a localized lower crust *** overall structural features of this region resemble those of typical Precambrian shields,in agreement with the long-term stability of the *** crustal structure under the Trans North China Orogen(TNCO,central NCC) is more complicated and characterized by smaller scale velocity variations,strong positive radial anisotropy in the middle crust and rapid change to weak-to-negative anisotropy in the lower *** features may reflect complex deformations and crustmantle interactions,probably associated with tectonic extension and magmatic under

关键词： Ambient noise tomography North China Craton Crustal shear velocity Radial anisotropy Crustal deformation

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地震学报 2019年第2期41卷 139-154,I0001页

作者：王耀姚华建房立华吴建平中国科学技术大学地球和空间科学学院中国合肥230026 蒙城地球物理国家野外科学观测研究站中国合肥230026 中国地震局地球物理研究所中国北京100081

本研究利用国家地震台网131个地震台站2009—2016年记录的1 749次近震的初至P波和S波走时数据,与采用快速行进方法正演计算得到的华北地区4个三维地壳速度模型对应的走时数据进行对比,通过统计分析的方法,评价这4个速度模型与真实地下... 详细信息

本研究利用国家地震台网131个地震台站2009—2016年记录的1 749次近震的初至P波和S波走时数据,与采用快速行进方法正演计算得到的华北地区4个三维地壳速度模型对应的走时数据进行对比,通过统计分析的方法,评价这4个速度模型与真实地下结构的近似程度。结果表明:4个速度模型在大范围内存在较高的一致性,在整个研究区内(111°E—119.5°E,37°N—42°N),Shen等的模型(简称"S模型")相对优于Fang等的模型(简称"F模型")和Duan等的模型(简称"D模型"),Laske等的Crust1.0模型(简称"C模型")相对较差。我们认为该结果与上述几个模型所使用的数据及其分辨率有关。对于研究区域内的构造单元,D模型在燕山褶皱带西南部、太行山山前构造带西北部和沧县隆起区表现较好,F模型在太行山隆起区中部、沧县隆起北部、黄骅凹陷区和燕山褶皱带表现较好,S模型在西部地块、山西凹陷区、太行山山前构造带和冀中凹陷区表现较好,C模型无明显连片表现较好区域。

关键词：华北地区地震走时三维地壳速度结构模型评价