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Accounting for site effect in probabilistic assessment of seismic hazard for Romania and Bucharest: a case of deep seismicity in Vrancea zone

机译：在罗马尼亚和布加勒斯特的地震危险性概率评估中考虑场地效应：以弗朗塞卡地区的强烈地震活动为例

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摘要

The paper presents recent achievements in evaluations of site-dependent seismic hazard in Romania and the capital city of Bucharest caused by the Vrancea focal zone (SE-Carpathians). The zone is characterized by a high rate of occurrence of large earthquakes in a narrow focal volume at depths 60-170 km. The database that was used for the hazard evaluation includes parameters of seismicity, ground-motion source scaling and attenuation models (Fourier amplitude spectra), and site-dependent spectral amplification functions. Ground-motion characteristics were evaluated on the basis of several hundred records from more than 120 small magnitude (M 3.5-5) earthquakes occurred in 1996-2001 and a few tens of acceleration records obtained during four large (M 7.4, 7.2, 6.9 and 6.3) earthquakes. The data provide a basis for probabilistic seismic hazard assessment in terms of peak ground acceleration, peak spectral acceleration and MSK intensity using Fourier amplitude spectra for various exceedance probabilities or average return periods. It has been shown that the influence of geological factors plays very important role in distribution of earthquake ground-motion parameters along the territory of Romania.
机译：本文介绍了在评估罗马尼亚和首都布加勒斯特由Vrancea震源区（SE-喀尔巴阡山脉）引起的基于地点的地震灾害方面的最新研究成果。该区域的特点是在60-170 km深度的狭窄震源中发生大地震的几率很高。用于危险评估的数据库包括地震活动性参数，地震动源缩放比例和衰减模型（傅立叶振幅谱）以及与地点相关的光谱放大功能。根据1996年至2001年发生的120多次小地震（M 3.5-5）的几百条记录以及在四次大地震（M 7.4、7.2、6.9和5.5）期间获得的几十个加速度记录，对地面运动特征进行了评估。 6.3）地震。该数据为峰值地震加速度，峰值频谱加速度和MSF强度（使用傅立叶振幅谱针对各种超出概率或平均返回周期）提供了概率地震危险评估的基础。研究表明，地质因素的影响在罗马尼亚境内沿地震动参数分布中起着非常重要的作用。

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