{"title":"Recognition of the pre-salt regional structural framework of Kwanza and Lower Congo basin, offshore in West Africa: derived from the satellite gravity data and seismic profiles","authors":"Zhaoxi Chen, Yalei Liu","doi":"10.1190/gem2019-045.1","DOIUrl":"https://doi.org/10.1190/gem2019-045.1","url":null,"abstract":"","PeriodicalId":422414,"journal":{"name":"International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Xi'an, China, 19–22 May 2019","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127196578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Gravity inversion method based on quasi-radial basis function neural network","authors":"Peng Xiang","doi":"10.1190/gem2019-015.1","DOIUrl":"https://doi.org/10.1190/gem2019-015.1","url":null,"abstract":"","PeriodicalId":422414,"journal":{"name":"International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Xi'an, China, 19–22 May 2019","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121211869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
W. Dong, Xuejun Liu, Zhanxiang He, Yongshan Zhu, Fan Yu
{"title":"The Application of TFEM in Tungsten Detection in Zhuxi, Jiangxi Province","authors":"W. Dong, Xuejun Liu, Zhanxiang He, Yongshan Zhu, Fan Yu","doi":"10.1190/gem2019-059.1","DOIUrl":"https://doi.org/10.1190/gem2019-059.1","url":null,"abstract":"","PeriodicalId":422414,"journal":{"name":"International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Xi'an, China, 19–22 May 2019","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116729844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Qi, Xiu Li, C. Yin, Z. Qi, N. Sun, Jianmei Zhou, Kailiang Lu, Bo Zhang
{"title":"Goal-oriented adaptive finite element method for time-domain Airborne EM modeling","authors":"Y. Qi, Xiu Li, C. Yin, Z. Qi, N. Sun, Jianmei Zhou, Kailiang Lu, Bo Zhang","doi":"10.1190/gem2019-064.1","DOIUrl":"https://doi.org/10.1190/gem2019-064.1","url":null,"abstract":"","PeriodicalId":422414,"journal":{"name":"International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Xi'an, China, 19–22 May 2019","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114585067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jianmei Zhou, Xu Jing, Kailiang Lu, Wentao Liu, Hang Yang, Xiu Li, Z. Qi
{"title":"3D TEM Modelling using Shift-and-Invert Krylov Subspace Methods","authors":"Jianmei Zhou, Xu Jing, Kailiang Lu, Wentao Liu, Hang Yang, Xiu Li, Z. Qi","doi":"10.1190/gem2019-063.1","DOIUrl":"https://doi.org/10.1190/gem2019-063.1","url":null,"abstract":"","PeriodicalId":422414,"journal":{"name":"International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Xi'an, China, 19–22 May 2019","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128758307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A fast and effective method on lock-in amplifier to detect the weak SNMR signal","authors":"Yang Zhang, Jian Chen, Li Suhang","doi":"10.1190/gem2019-030.1","DOIUrl":"https://doi.org/10.1190/gem2019-030.1","url":null,"abstract":"","PeriodicalId":422414,"journal":{"name":"International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Xi'an, China, 19–22 May 2019","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130984676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Gravity, magnetic, and electromagnetic surveys' applications and challenges","authors":"Haicong Chen","doi":"10.1190/gem2019-004.1","DOIUrl":"https://doi.org/10.1190/gem2019-004.1","url":null,"abstract":"","PeriodicalId":422414,"journal":{"name":"International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Xi'an, China, 19–22 May 2019","volume":"13 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128869299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Anisotropic magnetic susceptibility (AMS) contains information about the internal structure of magnetic geologic units and may have the potential to provide information about the formation history and subsequent geologic processes to which these units were subjected. Its application in the geological study has been established as a reliable tool in formation analyses. However, in the geophysical study, especially in magnetic data interpretation, there has not been much work on AMS, although its potential has been known for decades. Based on the current research status, the goal of this thesis is to assess the influence of AMS on induced magnetization and to explore the possibility of extracting structural information from magnetic data containing the influence of AMS. In this work, I review the basic mathematical expression of AMS and examine the rotation matrix through the derivation of Euler parameters. I show that the matrix can be directly formed by using the principal directions of the AMS within the user-defined coordinate system. Forward modeling of magnetic response over a synthetic AMS model shows that even at low susceptibility values, the induced magnetization direction can be rotated significantly away from the inducing field direction. A series of numerical experiments demonstrate that estimating source parameters directly from magnetic data in the presence AMS can recover the information of AMS and help to identify different magnetic units. The comparison between different constructions of rotation matrix provides us with a direct means to rotate AMS tensor for modeling purpose, while the forward modeling result shows that the interpretation of AMS-influenced data is faced with similar challenges as found in the cases of self-demagnetization due to high magnetic susceptibility or strong remanent magnetization. Parameter estimation studies show that it is possible to recover structural information through AMS from magnetic data without the assistance of laboratory measurements. This research opens the door for future work on magnetic data interpretation
{"title":"Effects of anisotropic magnetic susceptibility in data interpretation and potential in application","authors":"Zhuo Liu","doi":"10.1190/gem2019-089.1","DOIUrl":"https://doi.org/10.1190/gem2019-089.1","url":null,"abstract":"Anisotropic magnetic susceptibility (AMS) contains information about the internal structure of magnetic geologic units and may have the potential to provide information about the formation history and subsequent geologic processes to which these units were subjected. Its application in the geological study has been established as a reliable tool in formation analyses. However, in the geophysical study, especially in magnetic data interpretation, there has not been much work on AMS, although its potential has been known for decades. Based on the current research status, the goal of this thesis is to assess the influence of AMS on induced magnetization and to explore the possibility of extracting structural information from magnetic data containing the influence of AMS. In this work, I review the basic mathematical expression of AMS and examine the rotation matrix through the derivation of Euler parameters. I show that the matrix can be directly formed by using the principal directions of the AMS within the user-defined coordinate system. Forward modeling of magnetic response over a synthetic AMS model shows that even at low susceptibility values, the induced magnetization direction can be rotated significantly away from the inducing field direction. A series of numerical experiments demonstrate that estimating source parameters directly from magnetic data in the presence AMS can recover the information of AMS and help to identify different magnetic units. The comparison between different constructions of rotation matrix provides us with a direct means to rotate AMS tensor for modeling purpose, while the forward modeling result shows that the interpretation of AMS-influenced data is faced with similar challenges as found in the cases of self-demagnetization due to high magnetic susceptibility or strong remanent magnetization. Parameter estimation studies show that it is possible to recover structural information through AMS from magnetic data without the assistance of laboratory measurements. This research opens the door for future work on magnetic data interpretation","PeriodicalId":422414,"journal":{"name":"International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Xi'an, China, 19–22 May 2019","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116951234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Adaptive finite element modeling of marine controlled-source electromagnetic responses in threedimensional generally anisotropic conductivity media","authors":"Jiankai Li, Yuguo Li, Y. Liu, K. Spitzer, B. Han","doi":"10.1190/gem2019-040.1","DOIUrl":"https://doi.org/10.1190/gem2019-040.1","url":null,"abstract":"","PeriodicalId":422414,"journal":{"name":"International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Xi'an, China, 19–22 May 2019","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133737487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Liu Xu, Yaotian Yin, Wenbo Wei, Sheng Jin, Wenchuan Zhao, Z. Hao, Han Li
{"title":"Quasi-3D imaging of CSAMT data collected from dense profiles in the Zhaishang Carlin-type gold deposit, western Qinling, China","authors":"Liu Xu, Yaotian Yin, Wenbo Wei, Sheng Jin, Wenchuan Zhao, Z. Hao, Han Li","doi":"10.1190/gem2019-087.1","DOIUrl":"https://doi.org/10.1190/gem2019-087.1","url":null,"abstract":"","PeriodicalId":422414,"journal":{"name":"International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Xi'an, China, 19–22 May 2019","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116165385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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