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Evaluation of the seismic hazard for 20 cities in Romania using Monte Carlo based simulations

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Earthquake Engineering and Engineering Vibration 2017年第3期16卷 513-523页

作者： Florin Pavel Radu Vacareanu Seismic Risk Assessment Research Center Technical University of Civil Engineering Bucharest Romania

This work focuses on the evaluation of the seismic hazard for Romania using earthquake catalogues generated by a Monte Carlo approach. The seismicity of Romania can be attributed to the Vrancea intermediate-depth seismic source and to 13 other crustal seismic sources. The recurrence times of large magnitude seismic events（both crustal and subcrustal）, as well as the moment release rates are computed using simulated earthquake catalogues. The results show that the largest contribution to the overall moment release for the crustal seismic sources is from the seismic regions in Bulgaria, while the seismic regions in Romania contribute less than 5% of the overall moment release. In addition, the computations show that the moment release rate for the Vrancea subcrustal seismic source is about ten times larger than that of all the crustal seismic sources. Finally, the Monte Carlo approach is used to evaluate the seismic hazard for 20 cities in Romania with populations larger than 100,000 inhabitants. The results show some differences between the seismic hazard values obtained through Monte-Carlo simulation and those in the Romanian seismic design code P100-1/2013, notably for cities situated in the western part of Romania that are influenced by local crustal seismic sources.

关键词： seismic sources uncertainty seismic moment gmpe percentile

Spatial correlations in ground motion intensity measuring from the 2023 Türkiye earthquake

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Earthquake Research Advances 2024年第1期4卷 14-22页

作者： Guoliang Shao Ruizhi Wen Hongwei Wang Yeifei Ren Baofeng Zhou Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin150080 China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency ManagementHarbin150080 China

When evaluating an area's seismic risk or resilience,it is necessary to use the spatial correlation to analyze the ground motion parameters of multiple sites together in an *** two large earthquakes in Türkiye provided the possibility for spatial correlation analysis of ground motion intensity measurements in this *** on the strong motion records provided by The Disaster and Emergency Management Authority of Türkiye(AFAD),this study uses the local ground motion prediction equation in Türkiye to give spatial correlation analysis of Intensity *** study gives an exponential model based on a semivariogram and compares it with the correlation model obtained from previous studies.

关键词： Spatial correlation Semi-variance Türkiye gmpe

Characteristics of strong motions and damage implications of M_s6.5 Ludian earthquake on August 3,2014

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Earthquake Science 2015年第1期28卷 17-24页

作者： Peibin Xu Ruizhi Wen Hongwei Wang Kun Ji Yefei Ren Institute of Engineering Mechanics China Earthquake Administration

The Ludian County of Yunnan Province in southwestern China was struck by an Ms6.5 earthquake on August 3, 2014, which was another destructive event following the Ms8.0 Wenchuan earthquake in 2008, Ms7.1 Yushu earthquake in 2010, and Ms7.0 Lushan earthquake in 2013. National Strong-Motion Observation Network System of China collected 74 strong motion recordings, which the maximum peak ground acceleration recorded by the 053LLT station in Longtoushan Town was 949 cm/s2 in E-W component. The observed PGAs and spectral ordinates were compared with ground-motion prediction equation in China and the NGA-West2 developed by Pacific Earthquake Engineering Researcher Center. This earthquake is considered as the first case for testing applicability of NGA-West2 in China. Results indicate that the observed PGAs and the 5 % damped pseudo-response spectral accelerations are significantly lower than the pre- dicted ones. The field survey around some typical strong motion stations verified that the earthquake damage was consistent with the official isoseismal by China Earthquake Administration.

关键词： Ludian earthquake Strong motionrecording gmpe Seismic intensity Field survey

The High Frequency Decay Parameter <em>κ</em>(Kappa) in the Region of North East India

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Open Journal of Earthquake Research 2018年第2期7卷 141-159页

作者： Renu Yadav Dinesh Kumar Sumer Chopra Department of Geophysics Kurukshetra University Kurukshetra Haryana India Institute of Seismological Research Gandhinagar Gujarat India

The high frequency decay parameter κ has been considered as one of the important parameters required in the simulation of earthquake strong ground motions necessary for the proper evaluation of seismic hazard of a region. The present study estimated “κ” for the highly seismic active region of North East India. The spectral analysis of 598 accelerograms of 32 earthquakes has been done using [1] approach for this purpose. The average values of “κ” have been found to be 0.049, 0.047 and 0.040 for L-, T- and V-component respectively. The distance dependence of κ is not significant in the region. The κ 0 (κ at R = 0) for soft rock stations is found to be more than those of hard rock sites in consistent with other similar studies. The correlation between “κ” and earthquake magnitude at most of the stations for the region under study is not significant which indicates that κ depends on the site conditions in the region. The κ values estimated in the present study are useful for the evaluation of seismic hazard of the region.

关键词： Kappa gmpe Strong Ground Motion Simulation Seismic Hazard