{"title":"Short-term temporal variability of GPS receiver's differential code biases (DCB): retrieving and modeling","authors":"Baocheng Zhang, Y. Yuan, J. Ou","doi":"10.6038/CJG20160109","DOIUrl":"https://doi.org/10.6038/CJG20160109","url":null,"abstract":"","PeriodicalId":55257,"journal":{"name":"地球物理学报","volume":"59 1","pages":"101-115"},"PeriodicalIF":1.4,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71079366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We present a 3D forward modeling algorithm of marine controlled-source electromagnetic (CSEM) fields using finite element method based on unstructured meshes. As the unstructured mesh is incorporated, the algorithm can easily accommodate complex structures, such as dipping interfaces and rough topography. Secondary coupled-potential formulation of Maxwell's equations allows to avoid the singularities introduced by the sources. The primary electromagnetic fields excited by electric dipole source in layered isotropic media are derived from the semi-analytical formulas based on Schelkunoff potentials. To improve the accuracy and efficiency of the algorithm, we propose an effective local mesh refinement strategy, where the elements near the receiver locations and in the abnormal areas are refined using the volume constraints. We validate the finite element code against a 1D and 2D reservoir model and study the performance of the local mesh refinement strategy. The Canonical disc model illustrates the utility of the finite element method for 3D CSEM modeling. The bathymetry model study shows that the seafloor topography gives an important response which needs to be reproduced by numerical modeling to avoid the misinterpretation of measurements.
{"title":"3D finite element modeling of marine controlled-source electromagnetic fields using locally refined unstructured meshes","authors":"Yixin Ye, Li Yuguo, Y. Liu, Gang Li, Haiyan Yang","doi":"10.6038/CJG20161233","DOIUrl":"https://doi.org/10.6038/CJG20161233","url":null,"abstract":"We present a 3D forward modeling algorithm of marine controlled-source electromagnetic (CSEM) fields using finite element method based on unstructured meshes. As the unstructured mesh is incorporated, the algorithm can easily accommodate complex structures, such as dipping interfaces and rough topography. Secondary coupled-potential formulation of Maxwell's equations allows to avoid the singularities introduced by the sources. The primary electromagnetic fields excited by electric dipole source in layered isotropic media are derived from the semi-analytical formulas based on Schelkunoff potentials. To improve the accuracy and efficiency of the algorithm, we propose an effective local mesh refinement strategy, where the elements near the receiver locations and in the abnormal areas are refined using the volume constraints. We validate the finite element code against a 1D and 2D reservoir model and study the performance of the local mesh refinement strategy. The Canonical disc model illustrates the utility of the finite element method for 3D CSEM modeling. The bathymetry model study shows that the seafloor topography gives an important response which needs to be reproduced by numerical modeling to avoid the misinterpretation of measurements.","PeriodicalId":55257,"journal":{"name":"地球物理学报","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71079637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-01-01DOI: 10.15496/PUBLIKATION-14471
B. Deng
{"title":"Cenozoic mountain-building processes in the Daliangshan, southeastern margin of the Tibetan Plateau: Evidence from low-temperature thermochronology and thermal modeling","authors":"B. Deng","doi":"10.15496/PUBLIKATION-14471","DOIUrl":"https://doi.org/10.15496/PUBLIKATION-14471","url":null,"abstract":"","PeriodicalId":55257,"journal":{"name":"地球物理学报","volume":"33 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77130018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"GNSS radio occultation technique for near-Earth space environment detection","authors":"X. Yue, Yongxin Guo, Z. Zeng, W. Wan","doi":"10.6038/cjg20160401","DOIUrl":"https://doi.org/10.6038/cjg20160401","url":null,"abstract":"","PeriodicalId":55257,"journal":{"name":"地球物理学报","volume":"59 1","pages":"1161-1188"},"PeriodicalIF":1.4,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71079411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Li, W. Shen, Y. Wen, J. Zhang, Zhenhong Li, W. Jiang, Y. Luo
{"title":"Source parameters for the 2015 Nepal earthquake revealed by InSAR observations and strong ground motion simulation","authors":"Y. Li, W. Shen, Y. Wen, J. Zhang, Zhenhong Li, W. Jiang, Y. Luo","doi":"10.6038/CJG20160417","DOIUrl":"https://doi.org/10.6038/CJG20160417","url":null,"abstract":"","PeriodicalId":55257,"journal":{"name":"地球物理学报","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75256454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Liu Qing-chao, Sun He-ping, Xu Jianqiao, Lt, strong gt, Chen Xiao-Dong lt, Zhang Miao-miao, He Qian-qian
{"title":"The research of ocean tide loading effects on gravity and ambient noise at Zhongshan and Syowa station in Antarctic","authors":"Liu Qing-chao, Sun He-ping, Xu Jianqiao, Lt, strong gt, Chen Xiao-Dong lt, Zhang Miao-miao, He Qian-qian","doi":"10.6038/cjg20160805","DOIUrl":"https://doi.org/10.6038/cjg20160805","url":null,"abstract":"","PeriodicalId":55257,"journal":{"name":"地球物理学报","volume":"59 1","pages":"2773-2782"},"PeriodicalIF":1.4,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71079745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Guo Jin-yun, Wang Jianbo, Hu Zhi-bo, C. Hwang, Chen Chuanfa, Gao Yong-gang
{"title":"Temporal-spatial variations of sea level over China seas derived from altimeter data of TOPEX/Poseidon, Jason-1 and Jason-2 from 1993 to 2012","authors":"Guo Jin-yun, Wang Jianbo, Hu Zhi-bo, C. Hwang, Chen Chuanfa, Gao Yong-gang","doi":"10.6038/CJG20150908","DOIUrl":"https://doi.org/10.6038/CJG20150908","url":null,"abstract":"","PeriodicalId":55257,"journal":{"name":"地球物理学报","volume":"45 1","pages":"3103-3120"},"PeriodicalIF":1.4,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75121121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Su Ming, Sha Zhi-bin, Qi Shao-hua, Y. Rui, Wu Nengyou, Cong Xiaorong, L. Jie
The marine gas hydrate samples in China were for the first time acquired in the Shenhu area,northern continental slope of the South China Sea.However,due to erosion by the submarine canyons,the stratigraphic comparison and identification of sedimentary facies were difficult,leading to the lack of description of seismic-sedimentary facies,analysis of forming mechanisms and distribution of the sedimentary units.Moreover,few researches focused on the sedimentary evolution since Quaternary,and the crucial controlling factors on the heterogeneous distribution of gas hydrate are not clearly understood.Using high-resolution 2D/3Dseismic data,this study attempts to classify the seismic facies and discuss the sedimentary evolution in this area since Quaternary.This work is based on the high-resolution 2Dand 3Dseismic data obtained by Guangzhou Marine Geological Survey in 2006,with a trace interval of 12.5mand vertical resolution of 10~20 m.Firstly,we make an integrated analysis of seafloor topographic features,sequence stratigraphic framework and high-resolution seismic data,perform a classification of seismic facies have been classified,and describe morphological features and internal architectures accurately.Secondly,in terms of sediment supplies from the north and seafloor topography,deep-water sedimentary process is analyzed.Also,the sedimentary evolutions since Quaternary are re-built.Subsequently,the relationship between deep-water sediments since Quaternary and distribution of gas hydrates are discussed.Five types of seismic facies were identified,involving prograding slopes,small-scale turbidite channels in the Early Quaternary,sediment failures(including slides and slumps),submarine canyons and concomitant transformation of deposits,and the mixture of abysmal deposits and mass transport complex.The three phases of sedimentary evolution since Quaternary in the Shenhu area were re-built,which are turbidite channels erosion and re-deposited sediments,prograding slopes and sediments failures,and erosion and sedimentation of submarine canyons.Eroded by small-scale turbidites,re-deposited sediments would be near-source stacked with relatively good property conditions,which might be regarded as the potential suitable reservoirs for gas hydrates.The deposits transported from prograding slopes could lose the balance easily and result in sediments failures widespread in the Shenhu area.Because of the fine-grain particle and vertical continuity,sediment failures could be thought as the regional cap rock.Abundant submarine canyons and concomitant transformation of deposits could erode and destroy underlying strata,which modified suitable deposits as patch distribution.Hence,the sedimentary evolution since Quaternary was considered as one of the crucial controlling factors on the heterogeneous distribution of gas hydrate in the Shenhu hydrate drilling area,northern South China Sea.
{"title":"Sedimentary evolution since Quaternary in the Shenhu hydrate drilling area, northern South China Sea","authors":"Su Ming, Sha Zhi-bin, Qi Shao-hua, Y. Rui, Wu Nengyou, Cong Xiaorong, L. Jie","doi":"10.6038/CJG20150829","DOIUrl":"https://doi.org/10.6038/CJG20150829","url":null,"abstract":"The marine gas hydrate samples in China were for the first time acquired in the Shenhu area,northern continental slope of the South China Sea.However,due to erosion by the submarine canyons,the stratigraphic comparison and identification of sedimentary facies were difficult,leading to the lack of description of seismic-sedimentary facies,analysis of forming mechanisms and distribution of the sedimentary units.Moreover,few researches focused on the sedimentary evolution since Quaternary,and the crucial controlling factors on the heterogeneous distribution of gas hydrate are not clearly understood.Using high-resolution 2D/3Dseismic data,this study attempts to classify the seismic facies and discuss the sedimentary evolution in this area since Quaternary.This work is based on the high-resolution 2Dand 3Dseismic data obtained by Guangzhou Marine Geological Survey in 2006,with a trace interval of 12.5mand vertical resolution of 10~20 m.Firstly,we make an integrated analysis of seafloor topographic features,sequence stratigraphic framework and high-resolution seismic data,perform a classification of seismic facies have been classified,and describe morphological features and internal architectures accurately.Secondly,in terms of sediment supplies from the north and seafloor topography,deep-water sedimentary process is analyzed.Also,the sedimentary evolutions since Quaternary are re-built.Subsequently,the relationship between deep-water sediments since Quaternary and distribution of gas hydrates are discussed.Five types of seismic facies were identified,involving prograding slopes,small-scale turbidite channels in the Early Quaternary,sediment failures(including slides and slumps),submarine canyons and concomitant transformation of deposits,and the mixture of abysmal deposits and mass transport complex.The three phases of sedimentary evolution since Quaternary in the Shenhu area were re-built,which are turbidite channels erosion and re-deposited sediments,prograding slopes and sediments failures,and erosion and sedimentation of submarine canyons.Eroded by small-scale turbidites,re-deposited sediments would be near-source stacked with relatively good property conditions,which might be regarded as the potential suitable reservoirs for gas hydrates.The deposits transported from prograding slopes could lose the balance easily and result in sediments failures widespread in the Shenhu area.Because of the fine-grain particle and vertical continuity,sediment failures could be thought as the regional cap rock.Abundant submarine canyons and concomitant transformation of deposits could erode and destroy underlying strata,which modified suitable deposits as patch distribution.Hence,the sedimentary evolution since Quaternary was considered as one of the crucial controlling factors on the heterogeneous distribution of gas hydrate in the Shenhu hydrate drilling area,northern South China Sea.","PeriodicalId":55257,"journal":{"name":"地球物理学报","volume":"58 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71079111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chuandong Zhu, Yang Lu, Hongling Shi, Zizhan Zhang, Z. Du, Chunchun Gao
{"title":"Trends of glacial mass changes in High Asia from satellite gravity observations","authors":"Chuandong Zhu, Yang Lu, Hongling Shi, Zizhan Zhang, Z. Du, Chunchun Gao","doi":"10.6038/CJG20150309","DOIUrl":"https://doi.org/10.6038/CJG20150309","url":null,"abstract":"","PeriodicalId":55257,"journal":{"name":"地球物理学报","volume":"58 1","pages":"793-801"},"PeriodicalIF":1.4,"publicationDate":"2015-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71078625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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