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Full-Text Articles in Physical Sciences and Mathematics
Influence Of High In-Situ Stress Areas In The Coal Seam Roofs On Microseism-Based Tomographic Inversion, Liu Kaihang, Feng Lei, Yun Meihou, Cao Yunxing, Tian Lin
Influence Of High In-Situ Stress Areas In The Coal Seam Roofs On Microseism-Based Tomographic Inversion, Liu Kaihang, Feng Lei, Yun Meihou, Cao Yunxing, Tian Lin
Coal Geology & Exploration
High in-situ stress areas in the coal seam roofs are prone to induce mine dynamic hazard such as rock bursts. To meet the demand for safe coal mining, this study achieved real-time monitoring and swift early warning of high in situ stress areas. Specifically, based on data transmitted from microseismic stations in real time, this study conducted the inversion of the wave velocities in coal seams and rocks using a fast three-dimensional (3D) tomographic inversion algorithm. The accuracy of tomographic inversion results directly determines the judgment on the locations of high in situ stress areas. Therefore, by building a 3D …
The Relation Of Seismic Velocity And Attenuation Pattern In The East Anatolian Fault Zone With Earthquake Occurrence: Example Of January 24, 2020 Sivrice Earthquake, Şakir Şahi̇n, Erdinç Öksüm
The Relation Of Seismic Velocity And Attenuation Pattern In The East Anatolian Fault Zone With Earthquake Occurrence: Example Of January 24, 2020 Sivrice Earthquake, Şakir Şahi̇n, Erdinç Öksüm
Bulletin of the Mineral Research and Exploration
The East Anatolian Fault Zone (EAFZ) is one the main tectonic elements of Turkey, which borders the Anatolian plate from the east. EAFZ, which is NE - SW direction, consists of many fault segments. In the historical and instrumental period, many damaging earthquakes occurred, the largest being 6.8 (Ms) as the 1971 Bingöl earthquake. The last magnitude 6.6 (Ml) (Mw=6.8) earthquake occurred on January 24, 2020 in Elazığ-Sivrice Hazar-Sincik segment of EAFZ. However, considering the historical and instrumental activity, it is seen that many fault segments are silent. In this study, the silent and active segments, and their seismic velocity …
Borehole-Roadway Seismic-While-Mining Tomography Using Correlation Time Difference, Wang Yunhong, Wang Baoli, Cheng Jianyuan, Cui Weixiong, Jin Dan
Borehole-Roadway Seismic-While-Mining Tomography Using Correlation Time Difference, Wang Yunhong, Wang Baoli, Cheng Jianyuan, Cui Weixiong, Jin Dan
Coal Geology & Exploration
Using shearer as a source, seismic-while-mining(SWM) technology has realized dynamic, accurate and green intelligent detection in fully mechanized mining faces, and can be used to detect static geological anomaly and dynamic mining geological disasters within the work face. Conventional SWM observation system has the defect of blind area. To solve this problem, a new observation system with detectors installed in both roadway and within boreholes are proposed, which effectively improved the imaging range. Based on seismic interferometry principle, using frequency domain correlation algorithm, this paper turns the SWM signal to explosive source signal, and computes the equivalent shot sets. In …
Investigation Of Defective Trees Using Electric Resistivity Method, Turgay İşseven, Yi̇ği̇t Yilmaz, Nedi̇m Gökhan Aydin
Investigation Of Defective Trees Using Electric Resistivity Method, Turgay İşseven, Yi̇ği̇t Yilmaz, Nedi̇m Gökhan Aydin
Turkish Journal of Earth Sciences
The resistivity method in geophysics is used to solve various geological and engineering problems. Recently, this nondestructive method has been used on trees to investigate possible infections within the trunks by scanning resistivity variations. In this study, the electrical resistivity method has been aimed to be applied on various trees in Istanbul, Turkey to test whether the method applies to trees via regular resistivity measurement devices used in geophysics. Firstly, a multi-channel resistivity device, that is designed to automatically take measurements on the ground, is modified to carry out the measurements on trees. The measured data are processed using two …