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Field source characteristic of gravity variation in Hexi region before Menyuan Ms6.4 earthquake based on the euler deconvolution

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Geodesy and Geodynamics 2016年第5期7卷 317-322页

作者： Fang Liu Yingwei Wang Weifeng Liang The Second Monitoring and Application Center China Earthquake Administration CCCC First Highway Consultants Co. Ltd

This study adopted the euler deconvolution method to conduct an inversion and interpretation of the depth and spatial distribution pattern of field source that lead to gravity variation. For this purpose, mobile gravity data from four periods in the Hexi region between 2011 and 2015 were obtained from an observation network. With a newly established theoretical model, we acquired the optimum inversion parameters and conducted calculation and analysis with the actual data. The results indicate that one is the appropriate value of the structure index for the inversion of the mobile gravity data. The inversion results of the actual data showed a comparable spatial distribution of the field source and a consistent structural trend with observations from the Qilian-Haiyuan Fault zone between 2011 and 2015. The distribution was in a blocking state at the epicenter of the Menyuan earthquake in 2016. Our quantitative study of the field source provides new insights into the inversion and interpretation of signals of mobile gravity variation.

关键词： euler deconvolution Potential field inversion Gravity variation Structural index Menyuan Ms6.4 earthquake

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Improved euler method for the interpretation of potential data based on the ratio of the vertical fi rst derivative to analytic signal

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Applied Geophysics 2014年第3期11卷 331-339,352页

作者：郭灿灿熊盛青薛典军王林飞中国地质大学(北京)地球物理与信息技术学院北京100083 中国国土资源航空物探遥感中心北京100083

We propose a new automatic method for the interpretation of potential fi eld data, called the RDAS–euler method, which is based on euler＇s deconvolution and analytic signal methods. The proposed method can estimate the horizontal and vertical extent of geophysical anomalies without prior information of the nature of the anomalies（structural index）. It also avoids inversion errors because of the erroneous choice of the structural index N in the conventional euler deconvolution method. The method was tested using model gravity anomalies. In all cases, the misfi t between theoretical values and inversion results is less than 10%. Relative to the conventional euler deconvolution method, the RDAS–euler method produces inversion results that are more stable and accurate. Finally, we demonstrate the practicability of the method by applying it to Hulin Basin in Heilongjiang province, where the proposed method produced more accurate data regarding the distribution of faults.

关键词： euler deconvolution analytic signal edge identifi cation structural index

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Identification of suitable sites for open and bore well using ground magnetic survey

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Journal of Groundwater Science and Engineering 2021年第3期9卷 256-268页

作者： A Muthamilselvan Assistant Professor Department of Remote SensingBharathidasan UniversityTrichy-23.

The study aims to identify a suitable site for open and bore well in a farmhouseusing ground magnetic survey in south *** also aims to define depth to granitoid and structural elements which traverse the selected *** data(n=84)measured,processed and interpreted as qualitative and *** results of total magnetic intensities indicate that the area is composed of linear magnetic lows trending NE-SW direction and circular to semi-circular causative *** magnetic values ranged from-137 nT to 2345 nT with a mean of 465 *** to equator shows significant shifting of causative bodies in the southern and northern *** signal map shows exact boundary of granitic *** directional filter has brought out structural element trending NE-SW *** of individual profile brought to light structurally weak zone between 90 m and 100 m in all the profile *** decrease of magnetic values from 2042 nT to 126 nT noticed in profile line 6 between 20 m and 30 m indicates fault *** breaks obtained from these maps were visualized,interpreted and identified two suitable sites for open and bore *** averaged power spectrum estimates depth of shallow and deep sources in 5 m and 50 m,*** method has also been applied to estimate depth of granitoid and structural elements using structural indexes 0,1,2,and 3 and found depth ranges from90 *** indicates magnetic method is one of the geophysical methods suitable for groundwater exploration and site selection for open and borewells.

关键词： Magnetic method Groundwater exploration euler deconvolution Open well

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Aeromagnetic Interpretation of Basement Structures and Geometry in Parts of the Middle Benue Trough,North Central,Nigeria

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Advances in Geological and Geotechnical Engineering Research 2022年第4期4卷 22-40页

作者： Esho Oluwaseyi Olatubosun Osisanya Olajuwon Wasiu Ibitoye Taiwo Abel Ajibade Femi Zephaniah Tokunbo Sanmi Fagbemigun Department of Geology University of IbadanIbadanNigeria Department of Physics University of BeninBeninNigeria Department of Petroleum Engineering and Geosciences Petroleum Training InstituteEffurunNigeria Department of Geophysics Federal UniversityOye-EkitiNigeria

The research of an analysis of aeromagnetic data collected in the middle Benue Trough in north-central Nigeria is presented.A detailed analysis of basement structures is conducted in order to identify regions with high hydrocarbon potential that is different from those discovered by earlier *** data were filtered by using the Butterworth and Gaussian filters,transformed by engaging the reduction to the equator technique,and subsequently *** estimate magnetic basement depths at various places throughout the basin,the euler deconvolution depth weighting approach was ***(11)sub-basins with depths ranging from-2000 m to-8000 m were also identified by euler’s *** sub-basins trend in the NE-SW direction while the average sediment thickness is found to be more than 3 *** extracted structural features indicate areas like Kadi Blam and Kado areas in the southeastern part and Ogoja and Obudu in the southern part of the study area as regions with high structural *** areas coincide with the areas delineated as the *** cross-sections generated reveal depressions caused by the action of some tectonic activities in the *** study identified undulating basement topography believed to be due to tectonic activities as well as five areas that are possible targets for hydrocarbon exploration.

关键词： Aeromagnetic data euler deconvolution Basement structures Hydrocarbon potentials Middle Benue Trough

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Integration of Ground Magnetics and Energy Dispersive X-Ray Fluorescence Spectroscopy in Ilmenite Prospection in Magaoni, Kenya

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Open Journal of Applied Sciences 2016年第2期6卷 79-88页

作者： George Oduor Otieno John Gitonga Githiri Willis Jakanyango Ambusso Kenyatta University Nairobi Kenya Jomo-Kenyatta University of Agriculture Science and Technology Nairobi Kenya

The geology of Magaoni area is associated with the presence of heavy minerals [1]. Magaoni’s neighbours Maumba and Nguluku where ilmenite was discovered by Tiomin Resource Inc. in 1996, using drilling and chemical analysis [2]. Ilmenite mineral is known to be magnetically weak, but provides observable magnetic response [3]. In this study, ground magnetic survey method was carried out to map magnetic anomalies of established stations, associated with ilmenite bearing formations. The magnetic contour map plotted showed weak and shallow magnetic signatures spread throughout the study area. 2D euler deconvolution solutions revealed presence of magnetised formations from near surface to a maximum depth of about 450 m at some points. The weak magnetic formations of near surface indicated presence of ilmenite. Energy dispersive X-ray spectroscopy was done on soil samples collected randomly from the study area to determine the percentage of iron and titanium oxides. The results showed elevated values of titanium dioxide, ranging from 1.5% to 13% which is way above the global average of about 0.7% [4]. The percentage of iron oxide was low, ranging from 1.5% to 4%, this being the reason for weak magnetisation of the study area.

关键词： Ilmenite Magnetic Survey euler deconvolution Spectroscopy

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