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The 2023 Turkey earthquake doublet: Earthquake relocation, seismic tomography, and stress field inversion

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Earth and Planetary Physics 2024年第3期8卷 535-548页

作者： HuiLi Zhan Ling Bai Bagus Adi Wibowo ChaoYa Liu Kazuo Oike Yuzo Ishikawa State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Center of Earthquake and Tsunami Agency of MeteorologyClimatology and GeophysicsJakarta 10610Indonesia University of Shizuoka Shizuoka 422-8526Japan Shizuoka University Shizuoka 422-8529Japan

On February 6,2023,two earthquakes with magnitudes of M_(W) 7.8 and M_(W) 7.5 struck southeastern Turkey,causing significant casualties and economic *** seismic events occurred along the East Anatolian Fault Zone,a convergent boundary between the Arabian Plate and the Anatolian *** this study,we analyze the M_(W) 7.8 and M_(W) 7.5 earthquakes by comparing their aftershock relocations,tomographic images,and stress field *** earthquakes were localized in the upper crust and exhibited steep dip ***,the aftershocks occurred either close to the boundaries of low and high P-wave velocity anomaly zones or within the low P-wave velocity anomaly *** East Anatolia Fault,associated with the M_(W) 7.8 earthquake,and the SürgüFault,related to the M_(W) 7.5 earthquake,predominantly experienced shear ***,their western sections experienced a combination of strike-slip and tensile stresses in addition to shear *** ruptures of the M_(W) 7.8 and M_(W) 7.5 earthquakes appear to have bridged a seismic gap that had seen sparse seismicity over the past 200 years prior to the 2023 Turkey earthquake sequence.

关键词： Turkey earthquake doublet earthquake relocation seismic tomography stress field seismicity

Impact of well placement and flow rate on production efficiency and stress field in the fractured geothermal reservoirs

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Deep Underground Science and Engineering 2024年第3期3卷 358-368页

作者： Xinghui Wu Meifeng Cai Xu Wu Ketong Zhang Ziqing Yin Yu Zhu School of City and Architecture Engineering Zaozhuang UniversityZaozhuangChina School of Civil and Resource Engineering University of Science and Technology BeijingBeijingChina Beijing Municipal Engineering Research Institute BeijingChina Department of Civil and Environmental Engineering University of StrathclydeGlasgowUK

Geothermal energy has gained wide attention as a renewable alternative for mitigating greenhouse gas *** advancements in enhanced geothermal system technology have enabled the exploitation of previously inaccessible geothermal ***,the extraction of geothermal energy from deep reservoirs poses many challenges due to high‐temperature and high‐geostress *** factors can significantly impact the surrounding rock and its fracture formation.A comprehensive understanding of the thermal–hydraulic–mechanical(THM)coupling effect is crucial to the safe and efficient exploitation of geothermal *** study presented a THM coupling numerical model for the geothermal reservoir of the Yangbajing geothermal *** proposed model investigated the geothermal exploitation performance and the stress distribution within the reservoir under various combinations of geothermal wells and mass flow *** geothermal system performance was evaluated by the criteria of outlet temperature and geothermal *** results indicate that the longer distance between wells can increase the outlet temperature of production wells and improve extraction efficiency in the short *** contrast,the shorter distance between wells can reduce the heat exchange area and thus mitigate the impact on the reservoir stress.A larger mass flow rate is conducive to the production capacity enhancement of the geothermal system and,in turn causes a wider range of stress *** findings provide valuable insights into the optimization of geothermal energy extraction while considering reservoir safety and long‐term *** study deepens the understanding of the THM coupling effects in geothermal systems and provides an efficient and environmentally friendly strategy for a geothermal energy system.

关键词： geothermal exploitation performance geothermal reservoir mass flow rate stress field well placementa

stress field AT A TIP OF A PREFABRICATED SPIRAL V-NOTCH

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Applied Mathematics and Mechanics(English Edition) 2004年第6期25卷 612-617页

作者：郑周练陈山林叶晓明 Fuclty of Civil Engineering Chongqing UniversityChongqing400045P.R.China

Based on the tranditional V-notched blasting, a technique of spirally V-notched blasting to loosen earth and rock was presented. Fracture mechanics and Westergaard stress function were adopted to build a complex stress function to derive the plane stress and strain fields at one tip of the crack under a quasi-static pressure. An expression was formulated to define the stress intensity factor of spiral V-notch loosen blasting. Factors that have effects on the stress intensity factor were studied. It is demonstrated that spiral V-notch loosen blasting is an extension of vertical V-notch blasting, straight cracking, and alike theories.

关键词： prefabrication spiral notch stress field stress intensity factor quasi-static pressure

stress field evolution law of mining environment reconstructing structure with change of filling height

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Journal of Central South University 2010年第4期17卷 738-743页

作者：陈庆发周科平王利利 School of Resources and Safety Engineering Central South University College of Resources and Metallurgy Gu angxi University

For improving global stability of mining environment reconstructing structure,the stress field evolution law of the structure with the filling height change of low-grade backfill was studied by ADINA finite element analysis *** kinds of filling schemes were designed and calculated,in which the filling heights were 2,4,and 7 m,*** results show that there are some rules in the stress field with the increase of the filling height as follows:(1) the maximum value of tension stress of the roof decreases gradually,and stress conditions are improved gradually;(2) the tension stress status in the vertical pillar is transformed into the compressive stress status,and the carrying capacity is improved gradually;however,when the filling height is beyond 2.8 m,the carrying capacity of the vertical pillar grows very slowly,so,there is little significance to continue to fill the low-grade backfill;(3) the bottom pillar suffers the squeezing action from the vertical pillars at first and then the gravity action of the low-grade backfill,and the maximum value of tension stress of the bottom pillar firstly increases and then *** the economic factor,security and other factors,the low-grade backfill has the most reasonable height(2.8 m) in the scope of all filling height.

关键词： mining environment reconstructing strucre stress field filling height evolution law

stress field near interface crack tip of double dissimilar orthotropic composite materials

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Applied Mathematics and Mechanics(English Edition) 2008年第8期29卷 1045-1051页

作者：李俊林张少琴杨维阳 School of Applied Science Taiyuan University of Science and Technology Taiyuan 030024P.R.China

In this paper, double dissimilar orthotropic composite materials interfacial crack is studied by constructing new stress functions and employing the method of composite material complex. When the characteristic equations＇ discriminants △1 〉 0 and △2 〉0, the theoretical formula of the stress field and the displacement field near the mode I interface crack tip are derived, indicating that there is no oscillation and interembedding between the interfaces of the crack.

关键词： orthotropic interface crack crack tip stress field

stress field of Straight Edge Dislocation in Magnetic field

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Journal of Beijing Institute of Technology 2007年第1期16卷 112-115页

作者：刘兆龙胡海云范天佑 School of Science Beijing Institute of Technology Beijing 100081 China

To study the changes in mechanical properties of materials within magnetic fields and the motion of dislocations, stress fields of dislocation in magnetic field need to be calculated. The straight edge dislocation is of basic importance in various defects . The stress field of straight edge dislocation in an external static magnetic field is determined by the theory of elasticity and electrodynamics according to the Volterra dislocation model for continuous media. This reduces to the known stress field when the magnet field is zero. The results can be used for further study on the strain energy of dislocations and the interactions between dislocations in magnetic fields.

关键词： straight edge dislocation stress field magnetic field

Focal mechanisms of the Lushan earthquake sequence and spatial variation of the stress field

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Science China Earth Sciences 2015年第4期58卷 1148-1158页

作者： LUO Yan ZHAO Li ZENG XiangFang GAO Yuan Institute of Earthquake Science China Earthquake Administration Institute of Earth Sciences Academia Sinica Key Laboratory of Computational Geodynamics Chinese Academy of Sciences

Using broadband seismic records from regional networks, we determined the focal mechanisms and depths of 37 earthquakes in the 2013 M7.0 Lushan earthquake sequence(3.4≤Mw≤5.1) by fitting the three-component waveform data. The results show that the earthquakes are predominantly thrust events, with occasional strike-slip mechanisms. Most earthquakes occurred at depths of 10–20 km. We derived the regional distribution of the average stress field in this area using the damped linear inversion method and the focal mechanisms obtained in this study. The inversion results suggest that the Lushan region and the adjacent area are mostly under compression. The orientations of the maximum principal axes trend NW-SE, with some local differences in the stress distribution at different depths. Compared with the distribution of the stress field in the Wenchuan earthquake area, the stress field in the southwest section of the Longmenshan Fault zone(LFZ) share similar characteristics, predominantly thrust faulting with a few strike-slip events and the maximum compression axes being perpendicular to the LFZ.

关键词： Lushan earthquake focal mechanisms stress field aftershock sequence

Analytical solution for the stress field of hierarchical defects:multiscale framework and applications

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Applied Mathematics and Mechanics(English Edition) 2021年第2期42卷 183-208页

作者： Baijian WU Sheng ZHOU Zhaoxia LI Jiangsu Key Laboratory of Engineering Mechanics Southeast UniversityNanjing 210096China Department of Engineering Mechanics Southeast UniversityNanjing 210096China

Hierarchical defects are defined as adjacent defects at different length *** are the two scales where the stress field distribution is *** on the complex variable method and conformal mapping,a multiscale framework for solving the problems of hierarchical defects is *** separated representations of mapping function,the governing equations of potentials,and the stress field are subsequently *** proposed multiscale framework can be used to solve a variety of simplified engineering *** case in point is the analytical solution of a macroscopic elliptic hole with a microscopic circular edge *** results indicate that the microscopic defect aggregates the stress concentration on the macroscopic defect and likely leads to global propagation and *** micro-defects have interactive effects on the distribution of the stress *** level of stress concentration may be reduced by the coalescence of *** work provides a unified method to analytically investigate the influence of edge micro-defects within the scope of multiscale *** formulated multiscale approach can also be potentially applied to materials with hierarchical defects,such as additive manufacturing and bio-inspired materials.

关键词： hierarchical defect stress field multiscale framework scale separation complex variable method elliptic crack edge defect

Seismicity and stress field in Okinawa Trough and Ryukyu regions

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Acta Seismologica Sinica(English Edition) 1994年第4期7卷 513-520页

作者：黄培华苏维加陈金波 Department of Earth and Space Sciences University of Science and Technology of China Hefei China Department of Earth and Planetary Sciences Harvard University Cambridge USA

According to the seismic data (mb≥5. 0) from 1977 to 1991 and the focal mechanisms of 68 earthquakes from 1961 to 1991, the characters of seismicity and stress field in Okinawa Trough and Ryukyu regions are discussed in this paper, and the paper suggests that: ① The Tokara Channel fault belt is a fault belt with seismicity, cutting through lithosphere. ② The different stress state in the both subducting slabs on the both sides of Tokara Channel fault belt are caused by the difference of subducting depth of the both slabs. ③ The seismicity and stress field in the Okinawa Trough and Ryukyu regions are related not only to the subduction of the Philippine Sea Plate but also to the self-expanding action of Okinawa Trough.

关键词： seismicity stress field Okinawa Trough Ryukyu Island Arc Ryukyu Trench