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Characteristics of electromagnetic vector field generated from rock fracturing

Journal of rock Mechanics and Geotechnical Engineering 2023年第2期15卷 457-466页

作者： Menghan Wei Dazhao Song Xueqiu He Quan Lou Liming Qiu Zhenlei Li Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine University of Science and Technology BeijingBeijingChina School of Civil and Resources Engineering University of Science and Technology BeijingBeijingChina Zhong-An Academy of Safety Engineering BeijingChina School of Municipal and Environmental Engineering Henan University of Urban ConstructionPingdingshanChina

rock fracturing is often accompanied by electromagnetic *** a vector field,in addition to the intensity that is widely concerned,the generated electromagnetic field also has obvious *** this end,a set of electromagnetic antennas capable of simultaneous three-axis measurement is used to monitor the electromagnetic vector field generated from rock fracturing based on Brazilian *** signal amplitude on each axis can represent the magnitude of actual magnetic flux density component on the three *** intensity and directional characteristics of electromagnetic signals received at different positions are studied using vector *** directionality of electromagnetic radiation measured using a three-axis electromagnetic antenna shows that the direction of the magnetic flux intensity generated by rock fracturing tends to be parallel to the crack surface,and the measured signal intensity is greater in a direction closer to the crack surface.

关键词： Electromagnetic radiation Directionality Vector field rock fracturing

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Effect of rock mechanical properties on electromagnetic radiation mechanism of rock fracturing

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Journal of rock Mechanics and Geotechnical Engineering 2021年第4期13卷 798-810页

作者： Peng Lin Pengcheng Wei Cheng Wang Shengzu Kang Xin Wang Department of Hydraulic Engineering Tsinghua UniversityBeijing100084China

The influence of rock mechanical properties on the electromagnetic radiation(EMR)mechanism of rock fracturing is an important research topic in solid mechanics and earthquake *** this study,an EMR model of rock fracturing considering the fracture factor,elastic modulus,Poisson’s ratio,radiation distance and crack length is derived based on the Hertz oscillator array *** experimental system,including an electromagnetic shielding module,an EMR signal induction and transmission module,a signal recording module and a loading module,is developed to understand the EMR characteristics of four different *** validity of the EMR theoretical model is verified and the relationships between the rock cracking morphology and the EMR waveform,amplitude and frequency are *** is found that rock mechanical properties have obvious influences on the EMR waveform,amplitude and frequency during rock *** study provides a better understanding on the EMR mechanism of rock fracturing and can help to improve the accuracy of rock disaster prediction based on EMR.

关键词： Electromagnetic radiation(EMR)mechanism rock mecahnical properties rock fracturing Cracking morphology EMR waveform

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Time difference correlation between earthquake lights and seismic ground accelerations

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Applied Geophysics 2021年第1期18卷 9-16,128页

作者： Juan Antonio Lira Maurizio Mulas Facultad de Ciencias Físicas Universidad Nacional Mayor de San MarcosLima 1Peru Sección Física Departamento Académico de CienciasPontificia Universidad Católica del PerúLima 32Peru Escuela Superior Politécnica del Litoral ESPOLFacultad de Ingeniería en Ciencias de la TierraCampus Gustavo Galindo Km 30.5 Vía PerimetralP.O.Box 09-01-5863

Although earthquake lights have been known since ancient times,it has not been easy to study *** was not until the 60s that the first photographs of them were *** the Peruvian earthquake in 2007,it was possible to obtain the fi rst fi lm recording on earthquake ***,during the earthquakes in Ecuador in 2016 and in Mexico in 2017,two fi lms of the earthquake lights were *** fi lm recordings have helped in the study of earthquake lights,both for their objectivity and for their informational *** causal mechanisms have been proposed to explain earthquake lights:piezoelectricity,radon emanation,fluid diffusion,friction-vaporization,positive holes and dipole currents,among *** this work a time difference correlation between earthquake lights and seismic ground accelerations was found and we use both seismic data and fi lm recordings of earthquake lights to explain its *** the discussion section it is suggested that fracturing of rocks manifest itself to some extent in the form of static electricity producing earthquake lights through induction The induction model proposed is new and it can explain the formation of EQL,even if the earth’s crust has layers of large electrical *** model also explains the formation of seismic lights without the need for special conditions on the earth’s surface or in the atmosphere.A better understanding of the earthquake lights generation process can improve our understanding of seismicity and help in the prediction of earthquakes.

关键词： time diff erence correlation earthquake lights seismic ground accelerations rock fracturing

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