International Journal of Geophysics最新文献_第9页

3D Gravity Modeling of Complex Salt Features in the Southern Gulf of Mexico 墨西哥湾南部复杂盐层特征的三维重力模拟

IF 1.1

International Journal of Geophysics Pub Date : 2016-03-08 DOI: 10.1155/2016/1702164

Mauricio Nava-Flores, C. Ortiz-Alemán, M. Orozco-del-Castillo, J. Urrutia‐Fucugauchi, A. Rodríguez-Castellanos, C. Couder-Castañeda, A. Trujillo-Alcantara

引用次数: 7

Discovery of Naturally Etched Fission Tracks and Alpha-Recoil Tracks in Submarine Glasses: Reevaluation of a Putative Biosignature for Earth and Mars 海底玻璃中自然蚀刻裂变轨迹和α -反冲轨迹的发现:对地球和火星假定生物特征的重新评估

IF 1.1

International Journal of Geophysics Pub Date : 2016-02-17 DOI: 10.1155/2016/2410573

J. E. French, D. Blake

{"title":"Discovery of Naturally Etched Fission Tracks and Alpha-Recoil Tracks in Submarine Glasses: Reevaluation of a Putative Biosignature for Earth and Mars","authors":"J. E. French, D. Blake","doi":"10.1155/2016/2410573","DOIUrl":"https://doi.org/10.1155/2016/2410573","url":null,"abstract":"Over the last two decades, conspicuously “biogenic-looking” corrosion microtextures have been found to occur globally within volcanic glass of the in situ oceanic crust, ophiolites, and greenstone belts dating back to ~3.5 Ga. These so-called “tubular” and “granular” microtextures are widely interpreted to represent bona fide microbial trace fossils; however, possible nonbiological origins for these complex alteration microtextures have yet to be explored. Here, we reevaluate the origin of these enigmatic microtextures from a strictly nonbiological standpoint, using a case study on submarine glasses from the western North Atlantic Ocean (DSDP 418A). By combining petrographic and SEM observations of corrosion microtextures at the glass-palagonite interface, considerations of the tectonic setting, measurement of U and Th concentrations of fresh basaltic glass by ICP-MS, and theoretical modelling of the present-day distribution of radiation damage in basaltic glass caused by radioactive decay of U and Th, we reinterpret these enigmatic microtextures as the end product of the preferential corrosion/dissolution of radiation damage (alpha-recoil tracks and fission tracks) in the glass by seawater, possibly combined with pressure solution etch-tunnelling. Our findings have important implications for geomicrobiology, astrobiological exploration of Mars, and understanding of the long-term breakdown of nuclear waste glass.","PeriodicalId":45602,"journal":{"name":"International Journal of Geophysics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2016-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2016/2410573","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64271784","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}

引用次数: 10

A Superposition Based Diffraction Technique to Study Site Effects in Earthquake Engineering 基于叠加衍射技术研究地震工程场地效应

IF 1.1

International Journal of Geophysics Pub Date : 2016-02-16 DOI: 10.1155/2016/7131867

Juan Gómez, J. Jaramillo, Mario Saenz, Juan Vergara

引用次数: 4

Study on Coulomb Stress Triggering of the April 2015 M7.8 Nepal Earthquake Sequence 2015年4月尼泊尔7.8级地震序列库仑应力触发研究

IF 1.1

International Journal of Geophysics Pub Date : 2016-01-01 DOI: 10.1155/2016/7378920

Jianchao Wu, Qing Hu, Weijie Li, Dongning Lei

{"title":"Study on Coulomb Stress Triggering of the April 2015 M7.8 Nepal Earthquake Sequence","authors":"Jianchao Wu, Qing Hu, Weijie Li, Dongning Lei","doi":"10.1155/2016/7378920","DOIUrl":"https://doi.org/10.1155/2016/7378920","url":null,"abstract":"In April 2015, a M7.8 earthquake occurred less than one month before a M7.3 earthquake near Kodari, Nepal. The Nepal earthquake sequences also include four larger (M > 6) aftershocks. To reveal the interrelation between the main shock and the aftershocks, we check the role of coseismic coulomb stress triggering on aftershocks that follow the M7.8 main shock. Based on the focal mechanisms of the aftershocks and source models of the main shock, the coulomb failure stress changes on both of the focal mechanism nodal planes are calculated. In addition, the coulomb stress changes on the focal sources of each aftershock are also calculated. A large proportion of the M > 6 aftershocks occurred in positive coulomb stress areas triggered by the M7.8 main shock. The secondary triggering effect of the M7.3 aftershock is also found in this paper. More specifically, the M7.3 aftershock promoted failure on the rupture plane of the M6.3 aftershock. Therefore, we may conclude that the majority of larger aftershocks, which accumulated positive coulomb stress changes during the sequence, were promoted or triggered by the main shock failure. It suggests that coulomb stress triggering contributed to the evolution of the Nepal M7.8 earthquake sequence.","PeriodicalId":45602,"journal":{"name":"International Journal of Geophysics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2016/7378920","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64519224","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}

引用次数: 8

Comment on “Examination of a Theoretical Model of Streaming Potential Coupling Coefficient” “流势耦合系数理论模型的检验”述评

IF 1.1

International Journal of Geophysics Pub Date : 2015-12-10 DOI: 10.1155/2015/941246

P. Glover

引用次数: 2

Relative Motion between St. Croix and the Puerto Rico-Northern Virgin Islands Block Derived from Continuous GPS Observations (1995–2014) 基于连续GPS观测的圣克罗伊岛与波多黎各-北维尔京群岛之间的相对运动(1995-2014)

IF 1.1

International Journal of Geophysics Pub Date : 2015-08-27 DOI: 10.1155/2015/915753

Hanlin Liu, Guoquan Wang

{"title":"Relative Motion between St. Croix and the Puerto Rico-Northern Virgin Islands Block Derived from Continuous GPS Observations (1995–2014)","authors":"Hanlin Liu, Guoquan Wang","doi":"10.1155/2015/915753","DOIUrl":"https://doi.org/10.1155/2015/915753","url":null,"abstract":"St. Croix is located inside the sweep of the Lesser Antilles arc and near the southeastern edge of the Greater Antillean ridge. It is separated from the Puerto Rico and the Northern Virgin Islands (PRNVI) block by the Virgin Islands basin. Recent seismic activities demonstrate that the Virgin Islands basin is tectonically active. A better understanding of fault activities in the basin would improve seismic hazard assessment in this region. This study illustrates out a detailed way of deriving relative motion between St. Croix and the PRNVI block using current GPS geodesy infrastructure in the PRVI region. The local geodesy infrastructure includes over 20 continuous GPS stations and a Stable PRNVI Reference Frame (SPRNVIRF). Twenty-year continuous GPS observations (1995–2014) on St. Croix indicate that the island is presently moving away from the PRNVI block toward the southeast (S55°E) at a steady rate of 1.7 mm/year. The velocity vector can be decomposed into two 1.2 mm/year components along the long-axis and short-axis directions of the rhomboidal Virgin Islands basin. Quantitative results indicate that the Virgin Islands basin presently experiences left-lateral motion in a nearly east-west direction and extension in a nearly north-south direction.","PeriodicalId":45602,"journal":{"name":"International Journal of Geophysics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2015-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2015/915753","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64158096","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}

引用次数: 12

X-Ray Computed Tomography Analysis of Sajau Coal, Berau Basin, Indonesia: 3D Imaging of Cleat and Microcleat Characteristics 印度尼西亚Berau盆地Sajau煤的x射线计算机断层扫描分析:清晰和微清晰特征的三维成像

IF 1.1

International Journal of Geophysics Pub Date : 2015-07-05 DOI: 10.1155/2015/415769

A. Hamdani

{"title":"X-Ray Computed Tomography Analysis of Sajau Coal, Berau Basin, Indonesia: 3D Imaging of Cleat and Microcleat Characteristics","authors":"A. Hamdani","doi":"10.1155/2015/415769","DOIUrl":"https://doi.org/10.1155/2015/415769","url":null,"abstract":"The Pliocene Sajau coals of the Berau Basin area have a moderately to highly developed cleat system. Mostly the cleat fractures are well developed in both bright and dull bands, and these cleats are generally inclined or perpendicular to the bedding planes of the seam. The presence of cleat networks/fractures in coal seam is the important point in coalbed methane prospect. The 3D X-ray computed tomography (CT) technique was performed to identify cleats characteristics in the Sajau coal seams, such as the direction of coal cleats, geometry of cleat, and cleats mineralization. By CT scan imaging technique two different types of natural fractures observed in Sajau coals have been identified, that is, face cleats and butt cleats. This technique also identified the direction of face cleats and butt cleats as shown in the resulting 3D images. Based on the images, face cleats show a NNE-SSW direction while butt cleats have a NW-SE direction. The crosscutting relationship indicated that NNE-SSW cleats were formed earlier than NW-SE cleats. The procedure also identified the types of minerals that filled the cleats apertures. Based on their density, the minerals are categorized as follows: very high density minerals (pyrite), high density minerals (anastase), and low density minerals (kaolinite, calcite) were identified filling the cleats aperture.","PeriodicalId":45602,"journal":{"name":"International Journal of Geophysics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2015-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2015/415769","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64954658","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}

引用次数: 8

Superrotation of Earth’s Inner Core, Extraterrestrial Impacts, and the Effective Viscosity of Outer Core 地球内核的超旋转，地外撞击，以及外核的有效粘度

IF 1.1

International Journal of Geophysics Pub Date : 2015-05-21 DOI: 10.1155/2015/763716

P. Mohazzabi, J. Skalbeck

引用次数: 5

Geoelectrical Data Inversion by Clustering Techniques of Fuzzy Logic to Estimate the Subsurface Layer Model 利用模糊逻辑聚类技术反演地电数据估算地下层模型

IF 1.1

International Journal of Geophysics Pub Date : 2015-03-10 DOI: 10.1155/2015/134834

A. Raj, D. Oliver, Y. Srinivas

{"title":"Geoelectrical Data Inversion by Clustering Techniques of Fuzzy Logic to Estimate the Subsurface Layer Model","authors":"A. Raj, D. Oliver, Y. Srinivas","doi":"10.1155/2015/134834","DOIUrl":"https://doi.org/10.1155/2015/134834","url":null,"abstract":"Soft computing based geoelectrical data inversion differs from conventional computing in fixing the uncertainty problems. It is tractable, robust, efficient, and inexpensive. In this paper, fuzzy logic clustering methods are used in the inversion of geoelectrical resistivity data. In order to characterize the subsurface features of the earth one should rely on the true field oriented data validation. This paper supports the field data obtained from the published results and also plays a crucial role in making an interdisciplinary approach to solve complex problems. Three clustering algorithms of fuzzy logic, namely, fuzzy -means clustering, fuzzy -means clustering, and fuzzy subtractive clustering, were analyzed with the help of fuzzy inference system (FIS) training on synthetic data. Here in this approach, graphical user interface (GUI) was developed with the integration of three algorithms and the input data (AB/2 and apparent resistivity), while importing will process each algorithm and interpret the layer model parameters (true resistivity and depth). A complete overview on the three above said algorithms is presented in the text. It is understood from the results that fuzzy logic subtractive clustering algorithm gives more reliable results and shows efficacy of soft computing tools in the inversion of geoelectrical resistivity data.","PeriodicalId":45602,"journal":{"name":"International Journal of Geophysics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2015-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2015/134834","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64798044","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}

引用次数: 0

Detection of Leakage Areas in an Earth Embankment from GPR Measurements and Permeability Logging 利用探地雷达测量和渗透率测井检测土工堤防渗漏区域

IF 1.1

International Journal of Geophysics Pub Date : 2015-03-03 DOI: 10.1155/2015/610172

R. Antoine, C. Fauchard, Y. Fargier, E. Durand

引用次数: 24