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Determination of the local magnitudes of small earthquakes using a dense seismic array in the Changning-Zhaotong Shale Gas Field,Southern Sichuan Basin

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Earth and Planetary Physics 2021年第6期5卷 532-546页

作者： Wen Yang GuoYi Chen lingYuan Meng Yang Zang HaiJiang Zhang junlun li Laboratory of Seismology and Physics of the Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China National Geophysical Observatory at Mengcheng University of Science and Technology of ChinaMengcheng Anhui 233500China China Earthquake Networks Center Beijing 100045China

With the development of unconventional shale gas in the southern Sichuan Basin,seismicity in the region has increased significantly in recent *** the existing sparse regional seismic stations can capture most earthquakes with ML≥2.5,a great number of smaller earthquakes are often omitted due to limited detection *** the advent of portable seismic nodes,many dense arrays for monitoring seismicity in the unconventional oil and gas fields have been deployed,and the magnitudes of those earthquakes are key to understand the local fault reactivation and seismic ***,the current national standard for determining the local magnitudes was not specifically designed for monitoring stations in close proximity,utilizing a calibration function with a minimal resolution of 5 km in the epicentral *** is,the current national standard tends to overestimate the local magnitudes for stations within short epicentral distances,and can result in discrepancies for dense *** this study,we propose a new local magnitude formula which corrects the overestimated magnitudes for shorter distances,yielding accurate event magnitudes for small earthquakes in the Changning-Zhaotong shale gas field in the southern Sichuan Basin,monitored by dense seismic arrays in close *** formula is used to determine the local magnitudes of 7,500 events monitored by a two-phased dense array with several hundred 5 Hz 3 C nodes deployed from the end of February 2019 to early May 2019 in the Changning-Zhaotong shale gas *** magnitude of completeness(MC)using the dense array is-0.1,compared to MC 1.1 by the sparser Chinese Seismic Network(CSN).In addition,using a machine learning detection and picking procedure,we successfully identify and process some 14,000 earthquakes from the continuous waveforms,a ten-fold increase over the catalog recorded by CSN for the same period,and the MC is further reduced to-0.3 from-0.1 compared to the catalog obtained via ma

关键词： shale gas development local magnitude microearthquakes dense seismic array machine learning

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Ambient Noise Tomography of Jinan:The Migration of Groundwater and the Formation of Geothermal Water

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Acta Geologica Sinica(English Edition) 2022年第5期96卷 1716-1728页

作者： LEI Ting liANG Feng HAN Chen WANG Zhihui li junlun MA Yan YAO Huajian Chinese Academy of Geological Sciences Beijing 100037China SinoProbe Center Chinese Academy of Geological Sciences and China Geological SurveyBeijing 100037China Laboratory of Seismology and Physics of the Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China China University of Geosciences(Beijing) School of Geophysics and information technologyBeijing 100083China National Geophysical Observatory at Mengcheng University of Science and Technology of ChinaMengchengAnhui 233500China

Jinan is an important city in eastern China,with rich groundwater in the *** are four famous springs in the urban area and an abundance of geothermal water in the northern part,which makes the migration of groundwater in this area a very important *** study the shallow shear wave velocity structure and groundwater migration in Jinan,we utilized almost a month of continuous waveform data from 175 short period seismometers deployed by the Chinese Academy of Geological Sciences,in order to calculate the cross-correlation *** picked 7749 group dispersion curves and 6117 phase dispersion curves with a period range of 0.2–2 *** inversion,we obtained the fine threedimensional shear wave velocity and azimuthal anisotropy structure(0–2.4 km).Combining the results with local geological and hydrological data,the following conclusions were reached.(1)There are widespread high velocity anomalies in the region between the Qianfoshan and Wenhuaqiao faults,as well as to the east of the Wenhuaqiao Fault,which may be related to the intrusive gabbro known as the Jinan Intrusive Rock.(2)The two distinct high velocity anomalies in our model(referred to as west and east Jinan Intrusive Rock in this paper)may indicate that the Jinan Intrusive Rock was broken through crustal movement.(3)There is an obvious low velocity layer under the intrusive rock,which could be the channel of groundwater *** precipitation in the southern mountain region seeps down into the ground,then is blocked by the Jinan Intrusive Rock and can only progress downwards to a deeper part,where the groundwater is heated by the geothermal *** heated water finally arrives at the northern part and forms geothermal water.(4)The depth of the low velocity layer beneath the Jinan Intrusive Rock varies laterally,which may indicate that the depth of the groundwater migration is different beneath the west and east Jinan Intrusive Rock.(5)There is strong azimuthal anisotropy in souther

关键词： ambient noise tomography shear wave velocity structure urban underground space Jinan groundwater Baotu Spring Park

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High-resolution velocity structure and seismogenic potential of strong earthquakes in the Bamei-Kangding segment of the Xianshuihe fault zone

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Science China Earth Sciences 2023年第9期66卷 1960-1978页

作者： Yan ZHAO junlun li Jian XU Huajian YAO Gaohua ZHU Hongfeng YANG Jinyu ZHANG Renqi LU Laboratory of Seismology and Physics of the Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Mengcheng National Geophysical Observatory University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Comparative Planetology Hefei 230026China Key Laboratory of Marine Geology and Environment CASQingdao 266071China Earth System Science Programme Faculty of ScienceThe Chinese University of Hong KongHong Kong 999077China State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China

On September 5,2022,a strong MS6.8 earthquake struck the Luding area in the Kangding-Moxi segment of the Xianshuihe fault zone,which is the northern boundary of the Sichuan-Yunnan rhombic block,causing considerable *** Bamei-Kangding segment of the Xianshuihe fault zone,which is located only tens of kilometers away from the Luding earthquake,has hosted frequent moderate to strong earthquakes in history and is a dangerous earthquake-prone ***,it is critical to investigate the regional seismogenic environment for strong earthquakes and to evaluate the impact of the Luding earthquake in this *** this purpose,we deployed a dense seismic array comprising over 200 short-period nodes in this region from July to August,2022 and acquired seismic ambient noise for over 30 *** the collected data,we conducted surface wave tomography and obtained a high-resolution 3-D shear wave velocity model for the regional shallow crust down to 8 km in *** key findings include:(1)the Bamei-Kangding segment of the Xianshuihe fault zone exhibits widespread stripped lowvelocity anomalies,suggesting shear movements at a relatively high temperature of the Xianshuihe fault zone;the Zheduoshan granitic pluton situated between the Zheduotang and southern Selaha faults shows a distinct low-velocity anomaly,which may be attributed to the localized high-temperature anomaly resulted by a deep magmatic heat source and the recent rapid uplift of the Zheduoshan area;(2)a ten-kilometer-wide high velocity body found below 4 km in depth near the Zhonggu area in the Bamei segment coincides with the seismic gap of moderate to strong earthquakes in this region,suggesting that the high velocity body may act as a seismic barrier;(3)the heterogeneity of the velocity structure along the Bamei-Kangding segment of the Xianshuihe fault zone corresponds to the regional changes in temperature,which reveals the reason for the spatially varying seismogenic potential in this segment;e

关键词： Xianshuihe fault zone Bamei-Kangding segment Luding earthquake Dense-array ambient noise tomography Seismogenic environment for moderate to strong earthquakes

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Full moment tensor inversion constrained by doublecouple focal mechanism for induced seismicity

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Earthquake Science 2020年第4期33卷 177-193页

作者： Yuyang Tan Haijiang Zhang junlun li Chen Yin Furong Wu Key Lab of Submarine Geosciences and Prospecting Techniques MOE College of Marine GeoscienceOcean University of ChinaQingdao 266100China Laboratory of Seismology and Physics of Earth’s Interiors School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China School of Environment and ResourceSouthwest University of Science and Technology Mianyang 621010China Bureau of Geophysical Prospecting INC. China National Petroleum CorporationChengdu 610213China

In this study,we propose a new method to determine full moment tensor solution for induced *** method generalizes the full waveform matching algorithm we have developed to determine the double-couple(DC)focal mechanism based on the neighbourhood *** major difference between the new method and the former one is that we adopt a new misfit function to constrain the candidate moment tensor solutions with respect to a reference DC solution in addition to other misfit terms characterizing the waveform *** synthetic tests using a real passive seismic survey geometry,the results show the new constraint can help better recover the DC components of inverted moment *** further investigate how errors in the velocity model and source location affect the moment tensor *** synthetic test results indicate that the constrained inversion is robust in recovering both the DC and non-DC *** also test the proposed method on several real induced events in an oil/gas field in Oman using the same observation system as synthetic *** it is found that the full moment tensor solutions without using the DC constraints have much larger non-DC components than solutions with the DC constraints,both solutions are able to fit the observed waveforms at similar *** synthetic and real test results suggest the proposed DC constrained inversion method can reliably retrieve full moment tensor solutions for the induced seismicity.

关键词： induced seismicity moment tensor double-couple waveform inversion neighbourhood algorithm

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P-wave velocity structure in the crust and the uppermost mantle of Chao Lake region of the Tan-Lu Fault inferred from teleseismic arrival time tomography

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Earthquake Science 2022年第6期35卷 427-447页

作者： Bem Shadrach Terhemba Huajian Yao Song Luo Lei Gao Haijiang Zhang junlun li Laboratory of Seismology and Physics of Earth's Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei230026China Department of Physics Federal University DusteDutseJigawa StateNigeria Mengcheng National Geophysical Observatory University of Science and Technology of ChinaMengcheng 233500China CAS Center for Excellence in Comparative Planetology University of Science and Technology of ChinaHefei 230026China

Chao Lake is a Geoheritage site on the active Tan-Lu Fault between the Yangtze craton,the North China craton,and the Dabie orogenic belt in the *** segment of the fault is not well constrained at depth partly due to the overprinting of the fault zone by intrusive materials and its relatively low seismic activity and sparse seismic station *** study took advantage of a dense seismic array deployed around Chao Lake to delineate the P-wave velocity variations in the crust and uppermost mantle using teleseismic earthquake arrival time *** station-pair double-difference with waveform crosscorrelation technique was *** used a multiscale resolution 3-D initial model derived from the combination of highresolution 3-D v S models within the region of interest to account for the lateral heterogeneity in the upper *** results revealed that the velocity of the upper crust is segmented with structures trending in the direction of the strike of the *** basins are delineated on both sides of the fault with slow velocities,while the fault zone is characterized by high velocity in the crust and uppermost *** high-velocity structure in the fault zone shows characteristics of magma intrusion that may be connected to the Mesozoic magmatism in and around the Middle and Lower Yangtze River Metallogenic Belt(MLYMB),implying that the Tan-Lu fault might have formed a channel for magma *** material in Chao Lake is likely connected to the partial melting,assimilation,storage,and homogenization of the uppermost mantle and the lower crustal *** intrusions,however,seem to have suffered severe regional extension along the Tan-Lu fault driven by the eastward Paleo-Pacific plate subduction,thereby losing its deep trail due to extensional erosion.

关键词： teleseismic arrival time tomography v P velocity structure crust and uppermost mantle Tan-Lu Fault Chao Lake

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High resolution tomography of the Tanlu fault zone near Hefei with passive seismic and magnetotelluric linear array data

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Earthquake Science 2021年第1期34卷 24-35页

作者： Jian Xu Kangdong Wang junlun li Ning Gu Ning Ding Jiawei Qian Wen Yang Haijiang Zhang Laboratory of Seismology and Physics of the Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China National Geophysical Observatory at Mengcheng University of Science and Technology of ChinaMengcheng 233500China Geological Exploration Technology Institute of Anhui Province Hefei 230041China Geological Survey of Anhui Province Hefei 230002China

As the largest fault trending NNE-SSW to NE-SW in the eastern Eurasia Continent,the Tanlu fault zone(TLFZ)extends over 2,400 km within China,roughly from Wuxue,Hubei Province,to *** the Quaternary period,the TLFZ has been an earthquake-prone area in eastern China where several major earthquakes resulted by tectonic compression occurred,causing tremendous casualties and significant economic *** studies on different segments of the TLFZ have been carried out in the past few ***,numerous key questions regarding the fault zone remain unanswered due to a lack of clear subsurface characterization and fault *** this study,we present high-resolution tomographic results across the TLFZ to the east of Hefei,where one 22-km-long passive seismic array with densely spaced short-period nodes,and a 24-km-long magnetotelluric array were deployed adjacent to each *** find the velocity and resistivity variations are highly consistent with known surface *** property contrasts in both the seismic shear wave velocity and electrical resistivity profiles clearly delineate the Tanlu F1 fault(TLF-1)near *** interestingly,an upwelling with distinct high velocity is imaged within the Hefei Basin to the west of the TLF-1,whereas a slanted block with lowvelocity and low-resistivity seems to cut into or thrust upon the high-grade to low-grade middle-pressure rocks in the Zhangbaling uplift right below the Tanlu F2 ductile shear fault(TLF-2).The presented results show a new approach to characterize deep subsurface structure of the TLFZ beyond 2-km depths using passive data,which it is often difficult for active seismic surveys with refracted and reflected waves to image.

关键词： Tanlu fault zone deep structures ambient noise tomography magnetotellurics ductile shear zone

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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

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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

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2021年5月漾濞M_(S)6.4地震序列发震机理的应力分析

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地球物理学报 2023年第4期66卷 1448-1459页

作者：李振月李俊伦姚华建王宝善中国科学技术大学地球和空间科学学院合肥230026 蒙城地球物理国家野外科学观测研究站合肥230026 中国地震局地球物理研究所北京100081

为了从应力的角度解释2021年5月漾濞M_(S)6.4地震序列的发震机理,本文开展了包括刻画断层结构,反演震源区应力场,研究应力场对断层的加载作用以及地震序列中较大地震对断层活动的库仑应力影响等4个方面的研究,具体的认识为,(1)相比于前... 详细信息

为了从应力的角度解释2021年5月漾濞M_(S)6.4地震序列的发震机理,本文开展了包括刻画断层结构,反演震源区应力场,研究应力场对断层的加载作用以及地震序列中较大地震对断层活动的库仑应力影响等4个方面的研究,具体的认识为,(1)相比于前人工作中利用区域台阵定位结果刻画的断层结构,结合布设在漾濞震源区的实时地震监测台阵捕捉的7905个余震位置和沿断层均匀分布的16个M3.5以上地震的震源机制,我们刻画了漾濞地震序列发震断层的精细结构:漾濞地震序列最主要的特征为NW向和NE向两组断层共同破裂,NW向断层为右旋走滑破裂,NE向断层为左旋走滑破裂;(2)利用震源区1°×1°范围内的90个历史震源机制反演了震源区的背景应力场,得到震源区为近南北向水平挤压,东西向水平拉张的走滑型应力状态,应力方位的不确定度很小,而主应力相对大小(R)的不确定度很大,为0.2~0.8;(3)分析了漾濞地震序列两组发震断层的稳定性,发现两组发震断层均为应力场作用下最易失稳的断层.此外,发生在两组断层上地震的震源机制分别与两个最易失稳断层的震源机制相似,说明了背景应力对断层行为的控制作用;(4)两组断层都在失稳的边缘,任一组断层上的较强地震活动产生的应力扰动都可能推动另一组断层造成失稳,因此两组断层的活动存在着复杂的相互影响,我们对此亦进行了库仑应力的计算和验证.

关键词：漾濞地震序列震源机制应力断层稳定性应力触发

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基于机器学习和台阵相关性的水力压裂微地震事件自动识别及到时拾取

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地球物理学报 2023年第4期66卷 1558-1574页

作者：陈国艺杨文谭玉阳张海江李俊伦中国科学技术大学地球和空间科学学院合肥230026 蒙城国家地球物理野外科学观测研究站合肥230026 中国海洋大学海底科学与探测技术教育部重点实验室青岛266100 中国海洋大学海洋高等研究院深海圈层与地球系统教育部前沿科学中心青岛266100

利用密集台阵对水力压裂微地震进行监测将有助于优化储层压裂、揭示断层活化.为满足密集台阵海量采集数据的处理需求,本文建立了一种综合运用多种机器学习方法和台阵相关性的、无需人工干预的自动处理流程,从而能够快速得到高质量的密... 详细信息

利用密集台阵对水力压裂微地震进行监测将有助于优化储层压裂、揭示断层活化.为满足密集台阵海量采集数据的处理需求,本文建立了一种综合运用多种机器学习方法和台阵相关性的、无需人工干预的自动处理流程,从而能够快速得到高质量的密集台阵震相到时目录.该综合策略包括:(1)利用迁移学习在连续波形中快速检测地震事件;(2)利用U型神经网络PhaseNet自动拾取P波、S波震相;(3)利用三重线性剔除法,结合密集台阵到时相关性剔除异常到时数据和地震事件;(4)利用K-means和SVM两类机器学习算法,进一步区分发震时刻接近的多个地震事件,减小事件漏拾率.通过将该流程应用于四川盆地长宁—昭通页岩气开发区微地震监测数据,并将自动处理结果与人工拾取结果进行比对发现,二者在震级测定、定位以及走时成像结果等方面具有很好的一致性,表明本文处理流程结果精度可达到手动处理精度.本文结果为密集台阵地震监测数据的高效、高精度处理提供了新思路.

关键词：微地震监测机器学习密集台阵地震检测及震相拾取

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主动源全波形反演在内蒙古居延海坳陷多资源勘查中的应用

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地球物理学报 2024年第8期67卷 3120-3135页

作者：郑雪静李俊伦熊强青解建建李海鹏谭静刘增祺段涛安徽省勘查技术院(安徽省地质矿产勘查局能源勘查中心) 合肥230031 中国科学技术大学地球和空间科学学院合肥230026 Geophysics Department Stanford UniversityCAStanfordUSA 中国地震局地球物理勘探中心郑州450002

主动源全波形反演(Full Waveform Inversion,FWI)是一种基于波形匹配的高分辨率成像方法,近年来在近地表高分辨率成像中得到了较多的实际应用.然而,由于周期跳跃等因素导致的强非线性特征使得该方法对初始模型的准确性和地震数据的质量... 详细信息

主动源全波形反演(Full Waveform Inversion,FWI)是一种基于波形匹配的高分辨率成像方法,近年来在近地表高分辨率成像中得到了较多的实际应用.然而,由于周期跳跃等因素导致的强非线性特征使得该方法对初始模型的准确性和地震数据的质量具有较高的依赖性.初始模型与地下实际结构较大的偏差、数据中的噪声及低频成分缺失等问题都会导致反演过程中陷入局部极小值,从而难以收敛到真实的速度结构.目前,FWI主要用于处理海上数据,在短偏移距陆地数据的应用中仍面临着较大挑战.内蒙古居延海坳陷拥有丰富的煤和油气资源,勘探开发潜力很大,但由于地质条件较为复杂,构造不清,迫切需要对地下进行高精度、高分辨率成像以进行细致研究.本研究利用该地区采集的可控震源地震勘探数据,采用多目标函数FWI获得了2 km以浅的高精度纵波速度结构.同时,通过波形对比验证了速度模型的准确性,并基于波形反演获得的速度模型进行Kirchhoff叠前深度偏移,获得了高分辨率的深度域反射剖面.成像结果揭示了研究区域的4套主要沉积地层,为后期对该区域的进一步研究提供了重要依据,并通过程序开源共享为国内大量主动源活动构造探测提供了一套可靠的高分辨率反演成像流程.

关键词：全波形反演陆地主动源勘探叠前深度偏移成像居延海坳陷

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