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Three-dimensional analytical solution of acoustic emission or microseismic source location under cube monitoring network

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Transactions of Nonferrous Metals Society of China 2012年第12期22卷 3087-3094页

作者：董陇军李夕兵中南大学资源与安全工程学院长沙410083

To find the analytical solution of the acoustic emission/microseismic(AE/MS) source location coordinates, the sensor location coordinates were optimized and simplified. A cube monitoring network of sensor location was selected, and the AE/MS source localization equations were established. A location method with P-wave velocity by analytical solutions (P-VAS) was obtained with these equations. The virtual location tests show that the relocation results of analytical method are fully consistent with the actual coordinates for events both inside and outside the monitoring network; whereas the location error of traditional time difference method is between 0.01 and 0.03 m for events inside the sensor array, and the location errors are larger, which is up to 1080986 m for events outside the sensor array. The broken pencil location tests were carried out in the cross section of 100 mm×98 mm, 350 mm-length granite rock specimen using five AE sensors. Five AE sources were relocated with the conventional method and the P-VAS method. For the four events outside monitoring network, the positioning accuracy by P-VAS method is higher than that by the traditional method, and the location accuracy of the larger one can be increased by 17.61 mm. The results of both virtual and broken pencil location tests show that the proposed analytical solution is effective to improve the positioning accuracy. It can locate the coordinates of AE/MS source only using simple four arithmetic operations, without determining the fitting initial value and iterative calculation, which can be solved by a conventional calculator or Microsoft Excel.

关键词： acoustic emission seismic source sensor location analytical solution

ComprehensiveanalysesofseismicsourcelayerinXingtaiandTangshanseismicregionsandtheconditionsofmediaab

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Acta Seismologica Sinica(English Edition) 1996年第1期9卷 112-121页

作者：毛桐恩陈锦标姚家榴

Statistic analyses of sectional focal depth frequency relation for 1739 M S≥4.0 events in North China, 541 M S≥4.0 events in Xingtai seismic region and 999 M S≥4.0 events in Tangshan seismic region have been carried out for the first step of the study. Then the sectional focal depth frequency diagrams (H N diagram) for each region were obtained. The study shows that: (1) The intraplate earthquakes in North China occur within the continental crust, and are mainly concentrated within a certain depth range of the middle and upper crust, making up a seismic source layer; (2) The seismic source layer consists of a main layer and an auxiliary layer adjacent to it. The tops and bottoms of the main and auxiliary layers correspond to the G and C, as well as to B and G geologic boundaries respectively; (3) The H N diagrams for Xingtai and Tangshan seismic regions are significantly different from each other, indicating the regionality and localization of the seismic source layers; (4) DSS and MTS observations show that the regionality and localization of the seismic source layer depend mainly on the environment of the deep structures of the region; (5) The seismic source layer is a substance of medium layer, which can be related to the brittle ductile transition zone within the crust. The seismic source layer is also a stress conducting layer. As the media above and below this layer are subjected to failure or flowage, then the stress will concentrate in the stress conducting layer, in which the earthquake occurs.

关键词： intraplate earthquake seismic source seismic model conditions of media.

Three-dimensional analytical solution of acoustic emission source location for cuboid monitoring network without pre-measured wave velocity

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Transactions of Nonferrous Metals Society of China 2015年第1期25卷 293-302页

作者：董陇军李夕兵周子龙陈光辉马举中南大学资源与安全工程学院长沙410083 Australian Centre for Geomechanics The University of Western Australia

To find analytical solutions of nonlinear systems for locating the acoustic emission/microseismic（AE/MS） source without knowing the wave velocity of structures, the sensor location coordinates were simplified as a cuboid monitoring network. Different locations of sensors on upper and lower surfaces were considered and used to establish nonlinear equations. Based on the proposed functions of time difference of arrivals, the analytical solutions were obtained using five sensors under three networks. The proposed analytical solutions were validated using authentic data of numerical tests and experiments. The results show that located results are consistent with authentic data, and the outstanding characteristics of the new solution are that the solved process is not influenced by the wave velocity knowledge and iterated algorithms.

关键词： acoustic emission seismic source sensor location analytical solution

Tsunami hazard in the shorelines of Khark island (Persian Gulf),Iran

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Earthquake Science 2012年第4期25卷 299-305页

作者： Mehdi Zaré Seyed-Ahmad Hashemi Roya Ebadi Sahar Amirnejad-Mojdehi Roya Rahmani Ali Sardar International Institute of Earthquake Engineering and Seismology Iranian Oil Terminals Comyany

Iran is located in one of the seismically active regions of the world. Due to the high probability of earthquakes throughout the country and the potential for tsunami inundation along the coasts and offshore, comprehensive studies on theinteraction of these natural phenomena arc necessary, hi this study, the most conservative scenarios are determined for possible earthquakes within the Khark zone （Persian Gulf） *** on experimental relations between tile fault length, magnitude and displacement, which are paralneters for deter- mining tsunamigenic sources. Subsequently, the maximum height of tstmami waves are calculated based on the specitieations of the seismic source and its distance from the shore as well as the coastal slope. A zoning map of tsunami hazard is finally presented.

关键词： tsunami Khark island seismotectonic seismic source

Preface to the special issue on recent advances of deep structure,seismic anisotropy and seismotectonics in China

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Earthquake Science 2012年第1期25卷 1-2页

作者： Dongping Wei Fenglin Niu Yuan Gao Xuzhang Shen College of Earth Science Graduate University of Chinese Academy of SciencesBeijing 100049China Department of Earth Science Rice UniversityHoustonTX 77005USA Institute of Earthquake Science China Earthquake AdministrationBeijing 100036China Lanzhou Institute of Seismology China Earthquake AdministrationLanzhou 730000China

A workshop on crustal structure and seismotectonics was held on the Chinese Teacher＇s Day, the September 10th of 2011, in the city Lanzhou, China. Scientists and graduate students from Chinese Academy of Sciences, China Earthquake Administration, Chinese Academy of Geological Sciences, and Japan Agency for Marine-Earth Science and Technology delivered over 20 oral presentations, with topics covering crustal and upper mantle structure, seismic anisotropy, recent earthquakes and seismotectonics,

关键词： Rayleigh Wave Shear Crack seismic source Bull Seismol seismic Anisotropy