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Crustal thicknesses and Poisson's ratios beneath the Chuxiong-Simao Basin in the Southeast Margin of the Tibetan Plateau 预览
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作者 ZiQi Zhang Yuan Gao 《地球与行星物理:英文版》 CSCD 2019年第1期69-84,共16页
In the Southeast Margin of the Tibetan Plateau,low-velocity sedimentary layers that would significantly affect the accuracy of the H-κstacking of receiver functions are widely distributed.In this study,we use telesei... In the Southeast Margin of the Tibetan Plateau,low-velocity sedimentary layers that would significantly affect the accuracy of the H-κstacking of receiver functions are widely distributed.In this study,we use teleseismic waveform data of 475 events from 97 temporary broadband seismometers deployed by ChinArray Phase I to obtain crustal thicknesses and Poisson’s ratios within the Chuxiong-Simao Basin and adjacent area,employing an improved method in which the receiver functions are processed through a resonance-removal filter,and the H-κstacking is time-corrected.Results show that the crustal thickness ranges from 30 to 55km in the study area,reaching its thickest value in the northwest and thinning toward southwest,southeast and northeast.The apparent variation of crustal thickness around the Red River Fault supports the view of southeastern escape of the Tibetan Plateau.Relatively thin crustal thickness in the zone between Chuxiong City and the Red River Fault indicates possible uplift of mantle in this area.The positive correlation between crustal thickness and Poisson’s ratio is likely to be related to lower crust thickening.Comparison of results obtained from different methods shows that the improved method used in our study can effectively remove the reverberation effect of sedimentary layers. 展开更多
关键词 receiver functions sedimentary layer SOUTHEAST MARGIN of the Tibetan Plateau CRUSTAL thickness Poisson's ratio Chuxiong-Simao Basin
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Contemporary crustal tectonic movement in the southern Sichuan-Yunnan block based on dense GPS observation data 预览
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作者 HongLin Jin Yuan Gao +1 位作者 XiaoNing Su GuangYu Fu 《地球与行星物理:英文版》 CSCD 2019年第1期53-61,共9页
We analyzed 360 permanent and campaign GPS data from 1999 to 2017 in the southern Sichuan-Yunan block,and obtained crustal horizontal deformation in this region.Then,we derived the strain rate using a multi-scale sphe... We analyzed 360 permanent and campaign GPS data from 1999 to 2017 in the southern Sichuan-Yunan block,and obtained crustal horizontal deformation in this region.Then,we derived the strain rate using a multi-scale spherical wavelet method.Results reveal a complex pattern of tectonic movement in the southern Sichuan-Yunnan block.Compared to the stable Eurasian plate,the maximum rate of the horizontal deformation in the southern Sichuan-Yunnan block is approximately 22 mm/a.The Xiaojiang fault shows a significantly lower deformation—a left-lateral strike-slip movement of 9.5 mm/a.The Honghe fault clearly shows a complex segmental deformation from the north to south.The northern Honghe fault shows 4.3 mm/a right strike-slip with 6.7 mm/a extension;the southern Honghe fault shows 1.9 mm/a right strike-slip with 1.9 mm/a extension;the junction zone in the Honghe and Lijiang–Xiaojinhe faults shows an obvious clockwise-rotation deformation.The strain calculation results reveal that the maximum shear-strain rate in this region reaches 70 nstrain/a,concentrated around the Xiaojiang fault and at the junction of the Honghe and Lijiang–Xiaojinhe faults.We note that most of the earthquakes with magnitudes of 4 and above that occurred in this region were within the high shear strain-rate zones and the strain rate gradient boundary zone,which indicates that the magnitude of strain accumulation is closely related to the seismic activities.Comparison of the fast shear-wave polarization direction of the upper-crust with the upper-mantle anisotropy and the direction of the surface principal compressive strain rate obtained from the inversion of the GPS data reveals that the direction of the surface principal compressive strain is basically consistent with the fast shear-wave polarization direction of the upper crust anisotropy,but different from the polarization direction of the upper mantle.Our results support the hypothesis that the principal elements of the deformation mechanism in the southern Sichuan-Yunnan block are deco 展开更多
关键词 GPS DATA CRUSTAL horizontal deformation extension STRIKE SLIP strain rate fast SHEAR-WAVE polarization
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Surface Wave Group Velocity Tomography Imaging from Ambient Noise for Fujian Province and Its Adjacent Areas 预览
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作者 ZHANG Lina LUO Yan +3 位作者 CHEN Zhiyong XIE Zhizhao ZHOU Lanjie ZENG Xiangfang 《中国地震研究:英文版》 CSCD 2019年第1期52-61,共10页
Two-month continuous waveforms of 108 broadband seismic stations in Fujian Province and its adjacent areas are used to compute noise cross-correlation function (NCF). The signal quality of NCF is improved via the appl... Two-month continuous waveforms of 108 broadband seismic stations in Fujian Province and its adjacent areas are used to compute noise cross-correlation function (NCF). The signal quality of NCF is improved via the application of time-frequency phase weighted stacking. The Rayleigh and Love waves group velocities between 1s-20s are measured on the symmetrical component of the NCF with the multiple filter method. More than 5,000 Rayleigh wave dispersion curves and about 4,000 Love wave dispersion curves are obtained and used to invert for group velocity maps. This data set provides about 50km resolution that is demonstrated with checkerboard tests. Considering the off great circle effect in inhomogeneous medium, the ray path is traced based on the travel time field computed with a finite difference method. The inverted group velocity maps show good correlation with the geological features in the upper and middle crust. The Fuzhou basin and Zhangzhou basin showed low velocity on the short period group velocity maps. On the long period group velocity maps, the low velocity anomaly in the high heat flow region near Zhangzhou and clear velocity contrast across the Zhenghe-Dapu faults, which suggests that the Zhenghe-Dapu fault might be a deep fault. 展开更多
关键词 Fujian AMBIENT noise Surface WAVE GROUP VELOCITY TOMOGRAPHY IMAGING
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Improving Airgun Signal Detection with Small-Aperture Seismic Array in Yunnan 预览
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作者 WANG Weijun ZHOU Qingyun +3 位作者 KOU Huadong LIU Guiping ZHU Hongbo YAN Kun 《中国地震研究:英文版》 CSCD 2019年第2期248-264,共17页
Repeating airgun sources are eco-friendly sources for monitoring the changes in the physical properties of subsurface mediums,but their signals decay quickly and are buried in the noises soon after traveling short dis... Repeating airgun sources are eco-friendly sources for monitoring the changes in the physical properties of subsurface mediums,but their signals decay quickly and are buried in the noises soon after traveling short distances.Stacking waveforms from different airgun shots recorded by a single seismic station(shot stacking)is the most popular technique to detect weak signals from noisy backgrounds,and has been widely used to process the data of Fixed Airgun Signal Transmission Stations(FASTS)in China.However,shot stacking sacrifices the time resolution in monitoring to recover a qualified airgun signal by stacking many shots at distance stations,and also suffers from persistent local noises.In this paper,we carried out several small-aperture seismic array experiments around the Binchuan FAST Station(BCFASTS)in Yunnan Province,China,and applied the array technique to improve airgun signal detection.The results show that seismic array processing combining with shot stacking can suppress seismic noises more efficiently,and provide better signal-to-noise ratio(SNR)and coherent airgun signals with less airgun shots.This work suggests that the array technique is a feasible and promising tool in FAST to increase the time resolution and reduce noise interference on routine monitoring. 展开更多
关键词 Airgun SIGNAL Detection Small-Aperture SEISMIC Array Binchuan Fixed Airgun SIGNAL Transmission Stations(BCFASTS)
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Regional stress field in Yunnan revealed by the focal mechanisms of moderate and small earthquakes 预览
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作者 JianHui Tian Yan Luo Li Zhao 《地球与行星物理:英文版》 CSCD 2019年第3期243-252,共10页
We determined focal mechanism solutions of 627 earthquakes of magnitude M≥3.0 in Yunnan from January 2008 to May 2018 by using broadband waveforms recorded by 287 permanent and temporary regional stations.The results... We determined focal mechanism solutions of 627 earthquakes of magnitude M≥3.0 in Yunnan from January 2008 to May 2018 by using broadband waveforms recorded by 287 permanent and temporary regional stations.The results clearly revealed predominantly strike-slip faulting characteristics for earthquakes in Yunnan,with focal depths concentrated in the top 10 km of the crust.The earthquake mechanisms obtained were combined with the global centroid moment tensor solutions of 80 additional earthquakes from 1976 to 2016 to invert for the regional variations of stress field orientation by using a damped regional-scale stress inversion scheme.Results of the stress field inversion confirmed that the Yunnan region is under a strike–slip stress regime,with both maximum and minimum stress axes being nearly horizontal.The maximum compressional axes are primarily oriented in a northwest-southeast direction,and they experience a clockwise rotation from north to south,whereas the maximum extensional axes are oriented largely northeast-southwest.The maximum compressional axes are in line with the global positioning system–inferred horizontal velocity field and the southeastward escape of the Sichuan–Yunnan Rhombic Block,whereas the maximum extensional axes are consistent with anisotropy derived from SKS splitting.Against the strike–slip background,normal faulting stress regimes can be seen in the Tengchong volcanic area as well as in other areas with complex crisscrossing fault zones. 展开更多
关键词 earthquake FOCAL mechanism stress field INVERSION PRINCIPLE stresses YUNNAN region
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Implicit expansion rate of the Earth in global plate motions
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作者 Changyi Xu Xiao Yu Dongping Wei 《大地测量与地球动力学:英文版》 2019年第3期228-234,共7页
Based on eight published plate motion models, we separately estimated the net area changes of tectonic plates and the area change of the solid Earth surface over geological time using the Euler vectors of plates with ... Based on eight published plate motion models, we separately estimated the net area changes of tectonic plates and the area change of the solid Earth surface over geological time using the Euler vectors of plates with determined boundaries. Then, under the context of a currently expanding Earth, we inferred the change rate of the Earth’s mean radius from the estimated net area changes. The results show that the total increases and decreases in the areas of different plates cannot be compensated. Specifically, the area of the Northern Hemisphere decreases while that of the Southern Hemisphere increases, but the net area of the solid Earth surface slightly increases in th computing period(0.01 Ma). For the latest NNRMORVEL56 plate motion model, the area of the Southern Hemisphere increases by 7802 km2 while the area of the Northern Hemisphere decreases by 7711 km~2. This indicates a net area increase of 91 km2 in the solid Earth surface corresponding to an expansion rate of 0.06 mm/a for the Earths mean radius.This result coincides with the slow rate of expansion derived from geodetic measurements and geophysical modeling. 展开更多
关键词 PLATE MOTION model Area change of PLATE BOUNDARY EARTH EXPANSION
Some Thoughts on the Earthquake Science Experimental Site - The Underground Cloud Map 预览
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作者 CHEN Yong XU Yihe +1 位作者 CAI Huiteng LI Wen 《中国地震研究:英文版》 CSCD 2019年第1期1-8,共8页
The Western Yunnan Earthquake Predication Test Site set up jointly by the China Earthquake Administration, the National Science Foundation Commission of America, and United States Geological Survey has played an impor... The Western Yunnan Earthquake Predication Test Site set up jointly by the China Earthquake Administration, the National Science Foundation Commission of America, and United States Geological Survey has played an important role in development of early earthquake research work in China. Due to various objective reasons, most of the predicted targets in the earthquake prediction test site have not been achieved, and the development has been hindered. In recent years, the experiment site has been reconsidered, and renamed the “Earthquake Science Experimental Site”. Combined with the current development of seismology and the practical needs of disaster prevention and mitigation, we propose adding the “Underground Cloud Map” as the new direction of the experimental site. Using highly repeatable, environmentally friendly and safe airgun sources, we could send constant seismic signals, which realizes continuous monitoring of subsurface velocity changes. Utilizing the high-resolution 3-D crustal structure from ambient noise tomography, we could obtain 4-D (3-D space + 1-D time ) images of subsurface structures, which we termed the “ Underground Cloud Map ”. The “Underground Cloud Map ” can reflect underground velocity and stress changes, providing new means for the earthquake monitoring forecast nationwide, which promotes the conversion of experience-based earthquake prediction to physics-based prediction. 展开更多
关键词 Earthquake Science EXPERIMENTAL SITE The UNDERGROUND CLOUD MAP 4-D SEISMOLOGY Airgun
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Highlights of Recent Scientific Earthquake Hazard Mitigation 预览
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作者 PENG Fei 《中国地震研究:英文版》 CSCD 2019年第1期164-170,共7页
Earthquakes are a serious natural disaster faced by countries all over the world. Research on earthquake hazard mitigation are important parts of earthquake science and is a feature of China's development of earth... Earthquakes are a serious natural disaster faced by countries all over the world. Research on earthquake hazard mitigation are important parts of earthquake science and is a feature of China's development of earthquake science. In recent years, the Ministry of Science and Technology (MOST) of the People's Republic of China, the National Natural Science Foundation of China (NSFC) and the China Earthquake Administration (CEA) have attached great importance to basic research on earthquake hazard mitigation, and new opportunities and challenges have emerged. This paper collects the applications and approvals of the National Key R&D Program and the NSFC projects undertaken by the research institutes of the CEA system in recent years. The CEA system has received funding in the 13th “Five-year Plan” for “Monitoring, Early Warning and Prevention of Major Natural Disaster”. The implementation of these projects is expected to provide support for the basic science and applied research of the CEA system. In the NSFC, the number of applications from the CEA system is relatively stable, and the funding rate is slightly higher than the average for the department of earth science. Although no detailed statistical analysis has been performed, the CEA system still has room for improvement in the application of talent and major programs. I hope that the brief review of new opportunities that have arose in recent years described in this article can provide some background and new thinking for future challenges. 展开更多
关键词 EARTHQUAKE HAZARD MITIGATION Basic research Science and technology
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The Electric Field Detector (EFD) onboard the ZH-1 satellite and firstobservational results 预览
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作者 JianPing Huang JunGang Lei +4 位作者 ShiXun Li ZhiMa Zeren Cheng Li XingHong Zhu WeiHao Yu 《地球与行星物理:英文版》 2018年第6期469-478,共10页
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The Langmuir Probe onboard CSES: data inversion analysis methodand first results 预览
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作者 Rui Yan YiBing Guan +4 位作者 XuHui Shen JianPing Huang XueMin Zhang Chao Liu DaPeng Liu 《地球与行星物理:英文版》 2018年第6期479-488,共10页
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Iron Speciation of Mud Breccia from the Dushanzi Mud Volcano in the Xinjiang Uygur Autonomous Region, NW China 预览
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作者 XU Wang ZHENG Guodong +5 位作者 MA Xiangxian Danielle FORTIN David R. HILTON LIANG Shouyun CHEN Zhi HU Guoyi 《地质学报:英文版》 SCIE CAS CSCD 2018年第6期2201-2213,共13页
Organic-inorganic interactions occurring in petroleum-related mud volcanoes can help predict the chemical processes that are responsible for methane emissions to the atmosphere.Seven samples of mud breccia directly ej... Organic-inorganic interactions occurring in petroleum-related mud volcanoes can help predict the chemical processes that are responsible for methane emissions to the atmosphere.Seven samples of mud breccia directly ejected from one crater were collected in the Dushanzi mud volcano,along with one argillite sample of the original reddish host rocks distal from the crater,for comparison purposes.The mineral and chemical compositions as well as iron species of all samples were determined using XRD,XRF and M?ssbauer spectroscopy,respectively.The results indicate that a series of marked reactions occurred in the mud volcano systems,more specifically in the mud breccia when compared to the original rocks.Changes mainly included: (1) some conversion of clay minerals from smectite into chlorite and illite,and the precipitation of secondary carbonate minerals such as calcite and siderite;(2) silicon depletion and significant elemental enrichment of iron,manganese,magnesium,calcium and phosphorus;and (3) transformation of iron from ferric species in hematite and smectite into ferrous species in siderite,chlorite and illite.These geochemical reactions likely induced the color changes of the original reddish Neogene argillite to the gray or black mud breccia,as a result of reduction of elements and/or alteration of minerals associated with the oxidation of hydrocarbons.Our results also suggest that greenhouse gases emitted from the mud volcanoes are lowered through a series of methane oxidation reactions and carbon fixation (i.e.,through carbonate precipitation). 展开更多
关键词 MUD VOLCANO MUD BRECCIAS iron species ORGANIC-INORGANIC interactions GREENHOUSE gas
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Introduction to special section on the China Seismo-Electromagnetic Satellite and initial results 预览
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作者 XuHui Shen Qiu-Gang Zong XueMin Zhang 《地球与行星物理:英文版》 2018年第6期439-443,共5页
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Application system and data description of the China Seismo-Electromagnetic Satellite 预览
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作者 JianPing Huang XuHui Shen +8 位作者 XueMin Zhang HengXin Lu Qiao Tan Qiao Wang Rui Yan Wei Chu YanYan Yang DaPeng Liu Song Xu 《地球与行星物理:英文版》 2018年第6期444-454,共11页
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Seismological challenges in earthquake hazard reductions" reflections on the 2008 Wenchuan earthquake
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作者 Yong Chen Jiupeng Hu Fei Peng 《科学通报:英文版》 SCIE EI CSCD 2018年第17期1159-1166,共8页
关键词 地震危险 地震学 自然灾难 地震工程 地震破裂 经济损失 大地震 低速度
Seismic Inventory Simulation and Conformance Test Based on the Monte Carlo Method-A Case Study of the Fenhe-Weihe Belt 预览
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作者 Shao Xiaoyi Wang Xiaoqing +1 位作者 Dou Aixia Yuan Xiaoxiang 《中国地震研究:英文版》 CSCD 2018年第4期533-548,共16页
Artificial earthquake catalogue simulation is one of the ways to effectively improve the incompleteness of the existing earthquake catalogue,the scarcity of large earthquake records and the improvement of seismologica... Artificial earthquake catalogue simulation is one of the ways to effectively improve the incompleteness of the existing earthquake catalogue,the scarcity of large earthquake records and the improvement of seismological research.Based on the Poisson distribution model of seismic activity and the Gutenberg-Richter magnitude-frequency relationship,the Monte Carlo method which can describe the characteristics of the stochastic nature and the physical experiment process is used.This paper simulates the future seismic catalogues of the Fenhe-Weihe seismic belt of different durations and conducts statistical tests on them.The analysis shows that the simulation catalogue meets the set seismic activity parameters and meets the Poisson distribution hypothesis,which can obtain a better simulated earthquake catalogues that meets the seismic activity characteristics.According to the simulated earthquake catalogues,future earthquake trends in this region are analyzed to provide reference for seismic hazard analysis. 展开更多
关键词 Monte Carlo method SIMULATED EARTHQUAKE CATALOGUES SEISMIC activity Fenhe-Weihe SEISMIC BELT
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China Seismo-Electromagnetic Satellite search coil magnetometerdata and initial results 预览
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作者 Qiao Wang JianPing Huang1 +4 位作者 XueMin Zhang XuHui Shen ShiGeng Yuan Li Zeng JinBin Cao 《地球与行星物理:英文版》 2018年第6期462-468,共7页
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A study on the energetic electron precipitation observed by CSES 预览
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作者 YaLu Wang XueMin Zhang XuHui Shen 《地球与行星物理:英文版》 2018年第6期538-547,共10页
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The first joint experimental results between SURA and CSES 预览
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作者 XueMin Zhang Vladimir Frolov +4 位作者 ShuFan Zhao Chen Zhou YaLu Wang Alexander Ryabov DuLin Zhai 《地球与行星物理:英文版》 2018年第6期527-537,共11页
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Research of the Differential Uplifting in the Palongzangbu Region Based on the Synthesis of the Watershed Index and Seismic Data 预览
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作者 Wang Lin Zhao Yan +2 位作者 Tian Qinjian Li Wenqiao Xu Yueren 《中国地震研究:英文版》 CSCD 2018年第1期64-79,共16页
Research on the differential uplifting in the Palongzangbu region is crucial to understanding the tectonic deformation mechanism and establishing the model of the faulted blocks in the region of the east structural kn... Research on the differential uplifting in the Palongzangbu region is crucial to understanding the tectonic deformation mechanism and establishing the model of the faulted blocks in the region of the east structural knot.In this paper,based on the ASTER-30m DEM,we calculate the hypsometry index(HI)of 19 watersheds in the Palongzangbu region,and study the differential uplifting in this region combining with seismic data,the ground deposition and erosion process.The result shows that the spatial distribution of the HI value can reflect the differential uplifting in the study area.Differential uplifting exists within different zones,and there are 2 relative strong uplifting centers.One center is near the east structural knot,and the other lies between the Lhari fault and Nujiang fault at their converging segment.Also,the watershed evolution,seismic activity,and ground deposition and erosion process are closely related to each other,and they constitute a chain of evidence which reveals the whole process from the tectonic movement underground to the landform evolution on the surface 展开更多
关键词 WATERSHED Hypsometry INDEX GIS DEM Differential TECTONIC UPLIFTING East Structural KNOT
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Intermediate to Long-term Estimation of Strong Earthquake Risk Areas in the Chinese Mainland Based on Geodesic Measurements 预览
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作者 Zhang Jing Zhu Yiqing +2 位作者 Wu Yanqiang Zhang Xi Yang Guohua 《中国地震研究:英文版》 CSCD 2018年第2期153-172,共20页
Based on previous research results,present-day crustal deformation and gravity fields in the Chinese mainland are analyzed using the GPS data,leveling,gravity and cross-fault deformations.We analyzed strain accumulati... Based on previous research results,present-day crustal deformation and gravity fields in the Chinese mainland are analyzed using the GPS data,leveling,gravity and cross-fault deformations.We analyzed strain accumulation of the major faults,and identified locked or high strain accumulation segments.Combining the effects of large earthquakes in the study area,the long-term(decade)probability of large earthquakes in the Chinese mainland is estimated. 展开更多
关键词 ESTIMATION of earthquake risk area GEODETIC measurement The Chinese MAINLAND
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