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The April 14th, 2010 Yushu earthquake, a devastating earthquake with foreshocks

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Science china Earth Sciences 2010年第6期53卷 791-793页

作者： NI SiDao1, WANG WeiTao2 & LI Li3 1 School of Earth and Space Sciences, University of Science and Technology of china, Hefei 230026, china 2 institute of geophysics, china earthquake administration, beijing 100081, china 3 National earthquake Infrastructure Service, china earthquake administration, beijing 100036, china School of Earth and Space Sciences University of Science and Technology of China Hefei China institute of geophysics China Earthquake Administration Beijing China National earthquake Infrastructure Service China Earthquake Administration Beijing China

In the early morning of April 14th, 2010, a strong earth- quake (Ms7.1, http://***; Mw6.9, http://neic. ***) occurred in Yushu district, Qinghai Province, china. More than 2000 lives were lost and over 100000 injured,

关键词： Figure Yushu earthquake a devastating earthquake with foreshocks The April 14th 2010 very than

A preliminary study on seismic design criteria of offshore platforms in Bohai Sea of china

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earthquake Engineering and Engineering Vibration 2010年第2期9卷 223-231页

作者： Peng Yanju1,Lu Yuejun1,Yan Jiaquan2,Tang Rongyu1,Wang Junqin3 and Li Jiagang3 1. institute of Crustal Dynamics,china earthquake administration,beijing 100085,china 2. institute of geophysics,china earthquake administration,beijing 100081,china 3. beijing Research Center of china National Offshore Oil Corp.,beijing 100027,china institute of Crustal Dynamics China Earthquake Administration Beijing 100085 China

This paper analyzes the seismicity in Bohai Sea,introducing a shape factor K to characterize the seismic risk distribution in sub-regions of the sea. Based on the seismic design ground motions for 46 platforms located in the Bohai Sea,a statistical analysis was performed for different peak ground acceleration (PGA) ratios at two different probability levels. In accordance with the two-stage design method,a scheme of two seismic design levels is proposed,and two seismic design objectives are established respectively for the strength level earthquake and the ductility level earthquake. By analogy with and comparison to the Chinese seismic design code for buildings,it is proposed that the probability level for the strength level earthquake and ductility level earthquake have a return period of 200 and 1000 - 2500 years,respectively. The validity of these proposed values is discussed. Finally,the PGAs corresponding to these two probability levels are calculated for different sub-regions of the Bohai Sea.

关键词： fixed offshore platform seismic design level seismic design objective return period Bohai Sea

Discussion on moment tensor solution and seismogenic structure of Ruichang-Yangxin earthquake on 10 September 2011

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earthquake Science 2012年第3期25卷 229-234页

作者： Lifen Zhang1,2, Guichun Wei and Wulin Liao1 1 Key Laboratory of earthquake Geodesy, institute of Seismology, china earthquake administration, Wuhan 430071, china 2 institute of geophysics, china earthquake administration, beijing 100081, china Key Laboratory of earthquake Geodesy Institute of Seismology China Earthquake Administration Wuhan China institute of geophysics China Earthquake Administration Beijing China

Ruichang-Yangxin earthquake is another moderate earthquake in Yangxin-Jiujiang area since 2005 Jiujiang-Ruichang M5.7 earthquake. In order to more understand the seismic activities in this area, we study the moment tensor solution and the seismogenic structure of the Ruichang-Yangxin earthquake. Precise earthquake relocation shows that the mainshock occurred on the southwestern part of the NE-trending fault and aftershocks are distributed not only along the NE-trending fault but also along its conjugated NW-trending fault. By comprehensive analysis on the earthquake distribution, characteristics of isoseismal curve, focal mechanism, and regional structure characteristics, it is inferred that this earthquake is caused by the NE-trending Tanlu fault. In addition, it has close relationship with the conjugated NW-trending fault as well. Many researches have shown that the junction area is the earthquake-prone area, and should be paid more attention to. And our study also proves this viewpoint.

关键词： moment tensor inversion Ruichang-Yangxin earthquake seismogenic structure

Crustal P-wave velocity structure in Lower Yangtze region:Reinterpretation of Fuliji-Fengxian deep seismic sounding profile

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Crustal P-wave velocity structure in Lower Yangtze region:Re...

中国科学院地质与地球物理研究所2006学术年会

作者： BAI Zhiming~1 & WANG Chunyong~2 1.institute of Geology and geophysics,Chinese Academy of Sciences,beijing 100029,china 2.institute of geophysics,china earthquake administration,beijing 100081,china

The finite-difference inversion method and Rayinvr technique had been employed to interpret the wide-angle seismic reflection/refraction data of the Fuliji-Fengxian deep seismic sounding(DSS) profile in Lower Yangtze region,hence the velocity structure was acquired and conclusions were summarized as follows:(1) The velocity model along this profile can be divided into three large layers vertically(upper,middle and lower crusts) and six blocks laterally,and this velocity distribution agrees with the feature of stable platform.(2) The depth of Moho discontinuity is 30-36 *** thickness of the upper crust is 10.5-13.0km,where the lateral velocity varies strongly,and the velocity increases to 6.2 kms at ***,the velocity distributions in the bottom layer of middle crust and lower crust have an apparent *** velocity in upper layer of middle crust,lower layer of middle crust,lower crust and uppermost mantle is 5.9-6.2,6.3-6.4,6.6-7.0 and 8.06-8.29 kms,respectively.(3) On two sides of the Tanlu fault belt(TFB),the mid-crustal velocity structure is quite different, nevertheless no apparent discrimination in velocity distribution and boundary topography exhibits in lower crust,hence it is inferred that the Jiashan segment of TFB had probably cut through whole crust in the Mesozoic,and the fault behaviour in lower crust had disappeared due to the low viscosity produced by the orogenic extension or crustal balance,while the fault features in the rigid middle-upper crust have been preserved up to the present.(4) The moderate earthquakes with Ms>5.0 nearby Zhenjiang are related to the deep faults extending into the lower crust,and the earthquakes were probably induced by the energy been transferred from mantle lithosphere to upper-mid crust along the deep faults,and aggregated at some preferable tectonic positions.

关键词： eastern china Fuliji -Fengxian DSS profile wide-angle seismic data velocity structure Tanlu fault belt earthquake

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寂静地震与地震预测的物理问题

物理 2004年第11期33卷 796-800页

作者：吴忠良中国科学院研究生院地球科学学院

寂静地震是指发生了缓慢的位错、但几乎不辐射地震波的“地震” .在目前的地震预测的物理学研究中 ,通常是通过计算历史上曾经发生过的地震所引起的应力变化 ,或者通过研究地震活动的统计性质或“图像动力学” ,来推测一个断层带上发生... 详细信息

寂静地震是指发生了缓慢的位错、但几乎不辐射地震波的“地震” .在目前的地震预测的物理学研究中 ,通常是通过计算历史上曾经发生过的地震所引起的应力变化 ,或者通过研究地震活动的统计性质或“图像动力学” ,来推测一个断层带上发生地震的危险性 .寂静地震的信息的缺失 ,形成了地震预测的物理学研究中的一个很大的“盲区” ,而在相当程度上 ,解决地震预测的物理问题的主要困难和可能的突破的希望 ,也许就在于此 .寂静地震的研究目前还很不深入 .关于寂静地震的性质 ,文章作者提出两个猜想 :(1)寂静地震的频度 ,满足类似于GR定律的幂律分布 ;(2 )最大的寂静地震的地震矩 ,与“可见”的最大地震的地震矩相当 .

关键词：地震预测地震矩大地震地震活动地震波频度形成物理问题最大猜想

应用HHT方法识别刚度突降线性SDOF体系的动力特性

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天津大学学报 2006年第B6期39卷 203-208页

作者：张郁山梁建文胡聿贤杨彩红天津大学建筑工程学院天津300072 中国地震局地球物理研究所北京100081

以线性单自由度(SDOF)体系的刚度突降来模拟损伤引起的结构力学性能的变化,利用HHT方法分析了这种体系的强迫动力响应,并将体系动力响应的Hilbert谱与Morlet小波谱所蕴含的物理意义及分辨率特性进行了比较．分析结果表明：在规则的简谐... 详细信息

以线性单自由度(SDOF)体系的刚度突降来模拟损伤引起的结构力学性能的变化,利用HHT方法分析了这种体系的强迫动力响应,并将体系动力响应的Hilbert谱与Morlet小波谱所蕴含的物理意义及分辨率特性进行了比较．分析结果表明：在规则的简谐波输入下,结构动力响应的Hilbert谱能够分辨出体系的稳态与瞬态反应,利用瞬态反应,能够识别损伤引起的体系自身动力特性的变化；在不规则的地震动输入下,由于输入的复杂性,Hilbert谱不能够将体系的稳态与瞬态反应分解开来,但是利用体系动力响应Hilbert谱的瞬态能量分布特征定义了一种瞬时卓越频率时程(PIF),其随时间的变化能够在一定程度上描述损伤引起的体系动力特性的变化．

关键词：希尔伯特-黄变换线性SDOF体系刚度突降瞬时频率结构损伤

High-resolution Rayleigh wave phase velocity maps from ambient noise tomography in North china

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earthquake Science 2012年第3期25卷 241-251页

作者： Jiatie Pan institute of geophysics, china earthquake administration, beijing 100081, china institute of geophysics China Earthquake Administration Beijing China

We presented high-resolution Rayleigh wave phase velocity maps at periods ranging from 5 s to 30 s in the northeast part of the North china Craton (NNCC). Continuous time-series of vertical component between October 2006 and December 2008, recorded by 187 broadband stations temporarily deployed in the NNCC region, have been cross-correlated to obtain estimated fundamental mode Rayleigh wave Green’s functions. Using the frequency and time analysis technique based on continuous wavelet transformation, we measured 3 667 Rayleigh wave phase velocity dispersion curves. High-resolution phase velocity maps at periods of 5, 10, 20 and 30 s were reconstructed with grid size 0.25°× 0.25°, which reveal lateral heterogeneity of shear wave structure in the crust and upper mantle of NNCC. For periods shorter than 10 s, the phase velocity variations are well correlated with the principal geological units in the NNCC, with low-speed anomalies corresponding to the major sedimentary basins and high-speed anomalies coinciding with the main mountain ranges. Within the period range from 20 s to 30 s, high phase velocity observed in eastern NCC is coincident with the thin crust, whereas low phase velocities imaged in central NCC is correlated to the thick crust. However, the low-velocity anomaly in the beijing-Tianjin-Tangshan region displayed in the 20 s and 30 s phase maps may be associated with fluids.

关键词： Rayleigh wave phase velocity ambient noise tomography wavelet transformation North china Craton

Virtual ChuanDian--A parallel numerical modeling of Sichuan-Yunnan regional strong earthquake activities: Model construction and parallel simulation

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Science china Earth Sciences 2009年第10期52卷 1585-1598页

作者： ZHANG Huai1, WU ZhongLiang1,2, ZHANG DongNing2, LIU Jie2, WANG Hui2, YAN ZhenZhen1,2 & SHI YaoLin11 Laboratory of Computational Geodynamics, Graduate University of Chinese Academy of Sciences, beijing 100049, china 2 institute of geophysics, Chinese earthquake administration, beijing 100081, china Laboratory of Computational Geodynamics Graduate University of Chinese Academy of Sciences Beijing China institute of geophysics Chinese Earthquake Administration Beijing China

Reasonable use of mathematical modeling and numerical simulation of regional earthquake activities has attracted more and more attentions in realistic seismicity studies in recent years. The inherent nature of their attendant multi-scale properties, from either the temporal or the spatial direction, necessitates the use of the cutting-edge massive parallel data processing techniques. Our study here is focused on the model construction and numerical simulation of the regional stress evolution after large earthquake sequences along the fault zones in Sichuan and Yunnan areas, using large-scale parallel finite element approximations with tens of millions of unstructured meshes on the distributed systems. The objective of our study is to provide a state-of-the-art model and a large-scale numerical simulation platform, on which estimation of the risk of large earthquake triggering sequences can be carried out in a middle or long-term time scale with realistic data and constrains inputted from field observation and geological survey.

关键词： Sichuan-Yunan area seismic processing parallel simulation initial stress field

The tectonic settings and seismogenic tectonics of the M5.7 Jiujiang earthquake in 2005,Jiangxi Province,china

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Science china Earth Sciences 2008年第5期51卷 640-653页

作者： LI ChuanYou1, ZENG XinFu2 & ZHANG JianXi3 1 institute of Geology, china earthquake administration, beijing 100029, china 2 Jiangxi earthquake administration, Nanchang 330039, china 3 beijing earthquake administration, beijing 100080, china institute of Geology China Earthquake Administration Beijing China Jiangxi earthquake administration Nanchang China beijing earthquake administration Beijing China

The M5.7 Jiujiang earthquake in 2005 was a mid-strong one, stronger than expected to occur in the region. This paper discusses the neo-tectonic settings of this earthquake, and it is thought that the earthquake region is located in the transitional belt, a potential area inducing weak to moderately strong earthquakes, between two large different tectonic units. The results of the reconnaissance work and on-the-spot investigation after earthquake indicate that the occurrence of the M5.7 Jiujiang earth- quake is closely related with the NE-trending fault on the western margin of Ruichang Basin. From its controlling to the landforms and Quaternary depositions, geological profiles, ESR dating, etc., the ac- tivity of the Dingjiashan-Langjunshan fault bounding the basin is discussed. It suggests that this fault displays an active one in Middle Pleistocene by the outcrop. Based on the activity of the fault, and the direction and location of the ground fissures, the isoseismal lines and the nodal plane of the focal mechanism solution, it is inferred that the Dingjiashan-Langjunshan fault is the seismogenic tectonics of the M5.7 Jiujiang earthquake, and the intersection point between this fault and the active NW ones is the possible origin of location of this earthquake. Our study shows that this earthquake is not an event exceeding expectation, and that the active and invisible characteristics of the causative fault are typical in the eastern area of china.

关键词： Jiujiang earthquake tectonic settings Dingjiashan-Langjunshan fault activity seismogenic tectonics