检索结果-南通市图书馆

Acta Seismologica Sinica(English Edition) 1999年第1期12卷 26-34页

作者：王碧泉吴大铭边银菊 Institute of Geophysics China Seismological Bureau Beijing China State University of New York Binghamton U.S.A.

Using the strong motion records of Tangshan strong aftershocks, the attenuation characteristics of horizontal peak accelerations of strong motion in near field are studied in this paper and the attenuation relations (soil, soil and rock) in Tangshan area are obtained. Besides, we have obtained the attenuation relation in the eastern part of North America, and comparing it with those in North China. We think both of the attenuation tendencies are consistent and the attenuation characteristics in North China can give a reference to the ones in the eastern part of North America.

关键词： strong ground motion attenuation Tangshan earthquake

A new method to calculate near-field radiation excited by heterogeneous fault rupture

在线全文

学校读者我要写书评

暂无评论

Acta Seismologica Sinica(English Edition) 2007年第6期20卷 597-604页

作者：尚学峰刘启明张海明陈晓非 Computational Geodynamics Laboratory School of Earth and Space Sciences Peking University Department of Earth Science Graduate University of Chinese Academy of Sciences

This paper derives from the representation theory the formula for calculating the radiation excited by heterogeneous fault rupture based on box-like discretization scheme. Preliminary validation indicates that our algorithm has very high computation precision and efficiency; therefore, it is a very practical tool to investigate strong ground motion problems. Additionally, the equations given in this study can also be used to invert the fault rupture process.

关键词： strong ground motion complex finite fault rupture elastic half space Green function

Wenchuan earthquake fault and seismic disaster

在线全文

学校读者我要写书评

暂无评论

Earthquake Science 2009年第2期22卷 175-179页

作者： Boming Zhao Xiwei Xu School of Civil Engineering Beijing Jiaotong University Beijing 100044 China National Center for Active Fault Studies Institute of Geology China Earthquake Administration Beijing 100029 China

Major cases of the Ms8.0 Wenchuan earthquake are obtained through field investigations of the epicenter and high-intensity areas, and the relationships among earthquake faults, ground motion and earthquake disasters near fault zones are analyzed. Both strong deformation and ground rupture lead to significant damages of the buildings, indicating that it is necessary to keep safe distance away from active faults and to take other necessary measures. There are two reasons for that the buildings near the surface rupture zones have withstood in the strong earthquake, other than their seismic resistance capacities, with the first being the site condition, and the second the reduced effective stress and low rupture velocity. The forms of structural damages are complex in the fault areas, with shear failure and tensile and compressive damages. Those structures in urban areas that have used qualified materials and followed the building codes performed well in the earthquake. Survey results also indicate that structures of flexible materials may show better seismic performance.

关键词： Wenchuan earthquake earthquake fault seismic disaster strong ground motion

A Case Study on the Effect of Post-critical SmS on ground motion in Yingjiang,Yunnan Province,China

在线全文

学校读者我要写书评

暂无评论

Earthquake Research in China 2011年第1期25卷 1-12页

作者： Luo Yan Ni Sidao Chen Yong School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China Institute of Earthquake Science China Earthquake Administration Beijing 100036 China

There are controversies on ground motion attenuation relations at the epicentral distance of about 100km. Some models predict that the seismic energy remains almost constant or becomes even stronger with increasing distance at this distance, while other models hold that it decreases with increased distance. The divergence lies mainly in whether SmS is stronger than direct S and surface waves at this distance. With the MsS. 9 earthquake sequence in the Yingjiang region of Yunnan Province as an example, we demonstrate that SmS is always 2 - 5 times stronger than direct S waves around the epicentral distance of 100km （which is the post-critical distance for S in this region）. Study of synthetic seismograms suggest that crustal structure has an important effect on the amplitude of post-critical SmS, with simple crust producing strong SmS. This preliminary study confirms that in China, SmS also plays an important role on ground motion at distances around 100km, which demands more studies of post-critical SmS.

关键词： SmS phase strong ground motion Yingjiang area

An explanation of the large PGA value of 2013 MS 7.0 Lushan earthquake at 51BXD station through topographic analysis

在线全文

学校读者我要写书评

暂无评论

Earthquake Science 2013年第3期26卷 199-205页

作者： Zhijun Dai Xiaojun Li Institute of Geophysics China Earthquake Administration

In Ms7.0 Lushan earthquake, a large amount of strong ground motion recordings were collected. In this paper, we analyze the recordings carefully. The abnor- mality of ground motion recordings is identified through a log linear regression. In the station of 51BXD, the PGA value has exceeded 1 g, which is the biggest peak ground acceleration （PGA） value obtained from all recordings in this earthquake. The log linear relation shows the PGA value in this station is abnormally large. As this station is located on the footage of a hill, the topographic amplifi- cation factor is explored in order to explain this abnor- mality. Through 3D numerical modeling using spectral element method with transmitting boundary conditions, the amplification factor is quantized. In this station, the topo- graphic amplification is highly polarized in the direction of East-West which agrees with the empirical recordings. This research result suggests us in future directionality of topographic amplification should be considered in the aseismic design.

关键词： strong ground motion Topographicamplification ground motion directionality

Spatial-temporal characterization of the San Andreas Fault by fault-zone trapped waves at seismic experiment site,Parkfield,California

在线全文

学校读者我要写书评

暂无评论

Earthquake Science 2021年第3期34卷 261-285页

作者： Yong-Gang Li Department of Earth Sciences University of Southern CaliforniaLos Angeles 90089U.S.A

In this article,we review our previous research for spatial and temporal characterizations of the San Andreas Fault(SAF)at Parkfield,using the fault-zone trapped wave(FZTW)since the middle ***,California has been taken as a scientific seismic experimental site in the USA since the 1970s,and the SAF is the target fault to investigate earthquake physics and *** than ten types of field experiments(including seismic,geophysical,geochemical,geodetic and so on)have been carried out at this experimental site since *** the fall of 2003,a pair of scientific wells were drilled at the San Andreas Fault Observatory at Depth(SAFOD)site;the main-hole(MH)passed a~200-m-wide low-velocity zone(LVZ)with highly fractured rocks of the SAF at a depth of~3.2 km below the wellhead on the ground level(Hickman et al.,2005;Zoback,2007;Lockner et al.,2011).Borehole seismographs were installed in the SAFOD MH in 2004,which were located within the LVZ of the fault at~3-km depth to probe the internal structure and physical properties of the *** September 282004,a M6 earthquake occurred~15 km southeast of the town of *** data recorded in the field experiments before and after the 2004 M6 earthquake provided a unique opportunity to monitor the co-mainshock damage and post-seismic heal of the SAF associated with this strong *** retrospective review of the results from a sequence of our previous experiments at the Parkfield SAF,California,will be valuable for other researchers who are carrying out seismic experiments at the active faults to develop the community seismic wave velocity models,the fault models and the earthquake forecasting models in global seismogenic regions.

关键词： San Andreas fault fault-zone trapped wave low-velocity zonewave guide effect dispersion strong ground motion earthquake hazard propagator matrix finite-difference simulation dynamic rupture fault zone width and depth co-mainshock damage post-seismic healing seismic experimental site SAFOD

Rupture directivity of the August 3rd, 2014 Ludian earthquake(Yunan, China)

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2015年第3期58卷 795-804页

作者： HE XiaoHui NI SiDao LIU Jie Mengcheng National Geophysical Observatory University of Science and Technology of China State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and Geophysics China Earthquake Networks Center

An M6.5 earthquake occurred on August 3rd, 2014 in Ludian of Yunnan Province in China, causing severe casualty and economic loss. Local broadband waveform inversion with the CAP method demonstrates that the earthquake is a strike-slip event, with the strike along 70° and 160° for the two nodal planes respectively. However, the geological structure in the epicentral region is complicated with abundant active faults, and it is challenging to identify the seismogenic fault with the focal plane solutions due to nodal-plane ambiguity. We resolved the rupture directivity by measuring the difference between centroid location and hypocenter of the Ludian earthquake with the time shift from CAP inversion, and found that the nodal plane with the strike of 160° is the ruptured fault plane. Moreover, the rupture is found to propagate from northwest to southeast.

关键词： rupture directivity focal mechanism Ludian earthquake strong ground motion

同方期刊数据库

Dynamic mechanisms of earthquake-triggered landslides

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2013年第7期56卷 1769-1779页

作者： ZHU ShouBiao SHI YaoLin LU Ming XIE FuRen Institute of Crustal Dynamics China Earthquake Administration Key Laboratory of Computational Geodynamics Chinese Academy of Sciences

Earthquake-triggered landslides usually cause great disasters,and yet their dynamic mechanisms remain poorly *** paper will derive a general conceptual landslide model from the geometric and kinematic features of the most landslide masses triggered by the 2008 Wenchuan *** characteristics and dynamic processes are simulated here by means of finite element method(FEM)based on the dynamic process of the discontinuous deformable *** calculated results presented the whole course of landslide motion,and displayed some typical kinematic characteristics such as initiation,sliding,ejection,collision,flying in the air,and climbing of *** simulation result also shows that,under combined seismic inertial forces and gravity,landslides will start to slip once it overcomes the friction between the sliding mass and slip-bed,then it will move from slow to fast along the slippery bed until it ejects from the ***,the high frequencies and serious damages by landslides in the Wenchuan earthquake are caused by the strong ground motion on the mountain slopes in and around the epicenter that was dramatically amplified owing to both resonances produced by the seismic event and topographical amplification by seismic *** addition,the modeling results suggest that the direction,amplitude,frequency,and duration of strong ground motion have a great influence on the stability of landslide ***,the study helps us better understand dynamic mechanism of landslides,seismic hazard assessment,and dynamic earthquake triggering.

关键词： earthquake-triggered landslides strong ground motion dynamics finite element method Wenchuan earthquake

同方期刊数据库

Seismic Hazard Assessment for Japan after the 2011 Tohoku-Oki Mega-Thrust Earthquake （Mw9.0）

在线全文

学校读者我要写书评

暂无评论

Journal of Civil Engineering and Architecture 2012年第9期6卷 1117-1127页

作者： Hiroyuki Fujiwara Nobuyuki Morikawa National Research Institute for Earth Science and Disaster Prevention Ibaraki 305-0006 Japan

The Tohoku-Oki earthquake （Mw 9.0） of March 11,2011, was the largest event in the history of Japan. This magnitude 9.0 mega-thrust earthquake initiated approximately 100 km off-shore of Miyagi prefecture and the rupture extended 400-500 km along the Pacific plate. Due to the strong ground motions and tsunami associated by this event, approximately twenty thousand people were killed or missing and more than 220 thousands houses and buildings were totally or partially destroyed. This mega-thrust earthquake was not considered in the national seismic hazard maps for Japan that was published by the HERP （headquarters for earthquake research promotion） of Japan. By comparing the results of the seismic hazard assessment and observed strong ground motions, we understand that the results of assessment were underestimated in Fukushima prefecture and northern part of Ibaraki prefecture. Its cause primarily lies in that it failed to evaluate the Mw 9.0 mega-thrust earthquake in the long-term evaluation for seismic activities. On the other hand, another cause is that we could not make the functional framework which is prepared for treatment of uncertainty for probabilistic seismic hazard assessment work fully. Based on the lessons learned from this earthquake disaster and the experience that we have engaged in the seismic hazard mapping project of Japan, we consider problems and issues to be resolved for probabilistic seismic hazard assessment and make new proposals to improve probabilistic seismic hazard assessment for Japan.

关键词： Probabilistic seismic hazard long-term evaluation strong ground motion national seismic hazard maps for Japan Tohoku-Oki earthquake.