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seismic hazard assessment of Western Coastal Province of Saudi Arabia:deterministic approach

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Earthquake Science 2016年第5期29卷 299-309页

作者： Faisal Rehman Sherif M.El-Hady Ali H.Atef Hussein M.Harbi Department of Earth Sciences University of SargodhaSargodhaPakistan Geophysics Department King Abdulaziz UniversityJeddahSaudi Arabia Earthquake Department National Research Institute ofAstronomy and GeophysicsHelwanEgypt

seismic hazard assessment is carried out by utilizing deterministic approach to evaluate the maximum expected earthquake ground motions along the Western Coastal Province of Saudi Arabia. The analysis is accomplished by incorporating seismotectonic source model, determination of earthquake magnitude （Mmax）, set of appropriate ground motion predictive equations （GMPE）, and logic tree sequence. The logic tree sequence is built up to assign weight to ground motion scaling relationships. Contour maps of ground acceleration are generated at different spectral periods. These maps show that the largest ground motion values are emerged in northern and southern regions of the western coastal province in Saudi Arabia in comparison with the central region.

关键词： Earthquakes seismic hazard Logic tree Peak ground acceleration

Present status and prospective on the seismic hazard studies of major seismic gaps in the Sichuan-Yunnan region

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Science China Earth Sciences 2024年第11期67卷 3339-3366页

作者： Yong ZHENG Rumeng GUO Dechuan LIU State Key Laboratory of Geological Processes and Mineral Resources School of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China Innovation Academy for Precision Measurement Science and Technology Chinese Academy of SciencesWuhan 430077China Hubei Subsurface Multi-scale Imaging Key Laboratory Wuhan 430074China Luojia Laboratory Wuhan 430072China National Precise Gravity Measurement Facility Huazhong University of Science and TechnologyWuhan 430074China

Several seismic gaps have been identified along the Xianshuihe-Xiaojiang fault zone and the Longmenshan fault zone in the Sichuan-Yunnan region, including the Daofu-Shimian gap on the Xianshuihe Fault, the Anninghe-Zemuhe gap, parts of the Xiaojiang Fault, and the Dayi gap between the Wenchuan and Lushan earthquakes. The seismic hazards of the Daofu-Shimian and Dayi gaps have aroused great concern and caused considerable debate. This paper reviews the recent geophysical observations and multidisciplinary studies conducted by domestic and international researchers in these areas, focusing on seismogenic structures, seismic activity, fault locking, stress fields, as well as earthquake triggering, and further analyzes the current controversial viewpoints about the seismic hazards in these regions. Based on the comprehensive analysis, we argue that the kinematic status along the Daofu-Shimian segment may vary significantly along the fault strike. Due to limitations in data and models, there is no consensus on the seismogenic potential of this area. Conversely, the Dayi seismic gap presents a high seismic potential. Furthermore, we delve into the scientific problems associated with major seismic gaps in the Sichuan-Yunnan region and make prospects for the strategy of future work. We propose a research framework that combines dense array and distributed acoustic sensing, artificial intelligence and big data technologies, joint inversion of multiple geophysical fields, as well as numerical simulation techniques for comprehensive seismic hazard analysis in seismic gaps.

关键词： Sichuan-yunnan region seismic gap seismic hazard Present status Prospective

seismic hazard analysis for engineering sites based on the stochastic finite-fault method

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Earthquake Science 2022年第5期35卷 314-328页

作者： Ruifang Yu Yisheng Song Xiangyun Guo Qianli Yang Xinjuan He Yanxiang Yu Institute of Geophysics China Earthquake AdministrationBeijing 10081China

seismic hazard analyses are mainly performed using either deterministic or probabilistic ***,there are still some defects in these statistical model-based approaches for regional seismic risk assessment affected by the near-field of large ***,we established a deterministic seismic hazard analysis method that can characterize the entire process of ground motion propagation based on stochastic finite-fault simulation,and we chose the site of the Xiluodu dam to demonstrate the *** method can characterize earthquake source properties more realistically than other methods and consider factors such as the path and site attenuation of seismic *** also has high computational efficiency and is convenient for engineering *** first analyzed the complexity of seismogenic structures in the Xiluodu dam site area,and then an evaluation system for ground motion parameters that considers various uncertainties is constructed based on a stochastic finitefault ***,we assessed the seismic hazard of the dam site area *** proposed method was able to take into account the complexity of the seismogenic structures affecting the dam site and provide multi-level parameter evaluation results corresponding to different risk *** results can be used to construct a dam safety assessment system of an earthquake in advance that provides technical support for rapidly and accurately assessing the post-earthquake damage state of a dam,thus determining the influence of an earthquake on dam safety and mitigating the risk of potential secondary disasters.

关键词： Xiluodu dam seismic hazard ground motion parameters seismogenic structures

Site specific probabilistic seismic hazard analysis at Dubai Creek on the west coast of UAE

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Earthquake Engineering and Engineering Vibration 2011年第1期10卷 143-152页

作者： Ayman A. Shama Parsons Corporation 100 Broadway New York NY 10005 USA

A probabilistic seismic hazard analysis （PSHA） was conducted to establish the hazard spectra for a site located at Dubai Creek on the west coast of the United Arab Emirates （UAE）. The PSHA considered all the seismogenic sources that affect the site, including plate boundaries such as the Makran subduction zone, the Zagros fold-thrust region and the transition fault system between them; and local crustal faults in UAE. PSHA indicated that local faults dominate the hazard. The peak ground acceleration （PGA） for the 475-year return period spectrum is 0.17 g and 0.33 g for the 2,475-year return period spectrum. The hazard spectra are then employed to establish rock ground motions using the spectral matching technique.

关键词： seismic hazard PSHA subduction zone rock ground motion spectral matching logic tree fault

A seismic hazard Map Based on Geology and Shear-wave Velocity in Rawalpindi–Islamabad,Pakistan

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Acta Geologica Sinica(English Edition) 2021年第2期95卷 659-673页

作者： Sarfraz KHAN Muhammad WASEEM M.Asif KHAN National Centre of Excellence in Geology University of Peshawar 25130KPPakistan University of Peshawar 25120 KPPakistan

The‘twin cities’district of Rawalpindi–Islamabad is among the most endangered seismic regions in Pakistan,with the seismic hazard assessed(0.32 g)to intensity IX MMI for a 475-year return period.A seismic hazard map for Rawalpindi–Islamabad is presented herein,based on 85 shear-wave velocity(VS)profiles obtained through geophysical H/V measurements and from the geological map of the *** between the average top thirty-meter shear-wave velocities(VS30)and surficial geological units have been *** peak ground acceleration(PGA)maps for 150,475 and 2475-year return periods were converted into a seismic intensity *** increments for different soils were used to compute PGA values for 150,475 and 2475-year return *** located on softer ground experienced a higher degree of damage from moderate *** to the presence of soft clay or liquefiable soil and lateral spreading,a few locations may be classified as hybrid sites class C and *** map is a critical step in facilitating code-based site classification and seismic design throughout Rawalpindi–*** the seismic hazard map based on seismic intensities is no longer used in engineering geology,it is still important in seismological analysis and for civil protection purposes.

关键词： seismic hazard site classification intensity increment engineering geology Rawalpindi-Islamabad

Location of high seismic activity zones and seismic hazard assessment in Zabrze Bielszowice coal mine using passive tomography

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Journal of China University of Mining and Technology 2008年第2期18卷 177-181页

作者： LURKA A Central Mining Institute Katowice Poland

In the paper results of passive tomography calculations have been presented to assess rockburst hazard and locate high seismic activity zones in the vicinity of longwall 306 in Zabrze Bielszowice coal mine. The area of study was 1000 m in X direction by 900 m in Y direction. The zones of high values of P-wave propagation velocity have been found to correlate with the distribution of large seismic tremors.

关键词： seismic tomography seismic hazard seismic P-wave velocity rockbursts evolutionary algorithms

Features of seismic hazard in large dam projects and strong motion monitoring of large dams

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Frontiers of Structural and Civil Engineering 2010年第1期4卷 56-64页

作者： Martin WIELAND Chairman ICOLD Committee on Seismic Aspects of Dam DesignPoyry Energy Ltd.Zurich CH-8037Switzerland

Earthquakes can affect large dam projects in many different ***,design engineers are focussing on ground shaking and neglect the other *** May 12,2008 Wenchuan earthquake has damaged 1803 dams and reservoirs,and 403 hydropower plants with an installed capacity of *** these dams were the 132-m-high Shapai RCC arch dam and the 156-m-high Zipingpu concrete face rockfill *** recently completed dams are dam types which,up to now,have not experienced strong ground *** widespread mass movements have caused substantial damage to dams and surface powerhouses in *** different features of earthquake hazard are presented,i.e.,ground shaking,faulting and mass *** is proposed to prepare project-specific safety plans for all dams,which consist of a matrix where the possible hazards and the corresponding countermeasures are *** earthquake behaviors of the Sefid Rud,Zipingpu and Shapai dams,which,in the past,have experienced strong ground shaking from nearby earthquakes,are ***,the need for strong motion instrumentation of large dams is *** is proposed that major dams with large damage potential,dams located in areas of high seismicity,and dams showing signs of abnormal behavior be equipped with strong motion instruments.

关键词： seismic hazard arch dam concrete face rockfill dam strong motion instrumentation reservoirtriggered seismicity Wenchuan earthquake

A uniform catalog of earthquakes for seismic hazard asesment in Iran

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Acta Seismologica Sinica(English Edition) 1997年第6期10卷 20-33页

作者：高孟谭陈运泰王健

The assessment of seismicity is strongly dependent on the recorded events as data base. A uniform catalog of earthquakes in Iran and neighbouring regions is provided to use for seismic hazard assessment of the country. Since the recurrence time of maximum credible earthquake can not be estimated directly from m b, empirical relationships for different seismotectonic provinces are established to convert m b to M S , which is a suitable magnitude scale for our purpose. It emerges from completeness study of the catalog that many small and moderate earthquakes are missed out, specially in the historical and early instrumental time periods.

关键词： seismicity uniform catalog seismic hazard empirical relationships completeness

seismic hazard Assessment for Selected Real Locality in Central Europe-Critical Points of Assessment

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Journal of Energy and Power Engineering 2014年第9期8卷 1642-1646页

作者： Dana Prochazkova Katerina Demjancukova Faculty of Transportation Sciences Czech Technical University Praha 110 00 Czech Republic Department of Power System Engineering University of West Bohemia Univerzitni 8 Plzen 306 14 Czech Republic

The seismic hazard value is a fundamental quantity for the seismic risk assessment and for the determination of terms of references of seismic design of important facilities as dams, chemical plants, nuclear power plants, etc.. In real sites, the seismic hazard value is influenced by both, the earthquake sizes, the impacts of which in a given site may be expected, and the properties of geological structure through which seismic waves spread from earthquake loci to a given site. The seismic risk is predetermined by hazard value, distribution of assets in the given site and asset numbers and vulnerabilities. The paper describes the used procedure of hazard assessment of important sites. The attention is especially paid to the basic steps as the data collection （homogeneity level, uncertainty and vagueness）, the focal region boundaries （their uncertainties and vagueness）, and the maximum expected earthquake size in each focal region that must be taken into account （its uncertainty and vagueness）, because they substantially influence the hazard value. Discussion is also concentrated to the attenuation that Central Europe substantially depends on the azimuth between earthquake focus and the given site. The attenuation differences are shown in seismic scenarios for individual focal regions. They are caused by focal mechanisms in near focal zone and differences in structure properties in distant zone; the boundary between near and distant zone in Central Europe is ca 2.5 h, where h is the focal depth in km. The real results are given for a real locality in Central Europe. It is shown than that great influence on hazard value is caused by great differences in azimuth attenuation curves. It is the reality that the Bohemian Massif is characterised with very low seismic attenuation in comparison with its vicinity. The following real results are presented： geological structure of near site vicinity, earthquake catalogue for Central Europe, focal regions in Central Europe, atten

关键词： Earthquake seismic hazard seismic risk attenuation extreme theory deterministic approach.