罗马尼亚弗朗切亚与喀尔巴阡山脉外地区坝有关的地壳下地震烈度衰减关系的检验

A. Constantin
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引用次数: 0

摘要

本文的目的是测试在弗朗切(罗马尼亚)发震带发生的与喀尔巴阡山脉外地区一些重要大坝有关的地壳下地震的强度衰减关系。几个世纪以来,罗马尼亚领土一直受到强烈地震的震动,其中大多数地震集中在弗朗西亚地区,该地区位于喀尔巴阡山脉东南部的弯曲地区。喀尔巴阡山脉外大部分地区受地壳下地震事件的影响,那里存在许多水利工程结构,也受到地震作用的影响。利用最新和完整的强度数据集,对地壳下震源的强度衰减规律进行了详细分析。我们使用扩展和综合强度数据,包括历史和现代,定性和定量数据,即1738-2009年期间发生的11次地震,震中/最大强度范围为7 - x MSK度,震级为5.4至7.9级。所有用于测试的输入数据都是在对本研究(8697 IDP)中包含的地震事件产生的宏观地震效应进行重新评估和评价后得出的。选取的衰减规律在不同震源强度值下,参照12和24个方位进行了测试。除了对这些关系进行检验外,还完成了基于所选衰减规律的等震图,与Vrancea地壳下带可能发生的最大地震(最坏情况)相关联,并突出显示了所选坝址的计算强度。简要说明研究和使用的方法。简要说明研究和使用的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
TESTING THE MACROSEISMIC INTENSITY ATTENUATION RELATIONSHIPS FOR VRANCEA (ROMANIA) SUBCRUSTAL EARTHQUAKES IN RELATION WITH DAMS SITUATED IN EXTRA-CARPATHIAN AREA
The aim of the present paper is to test intensity attenuation relationships for subcrustal earthquakes occurred in Vrancea (Romania) seismogenic zone in relation with some important dams situated in extra-Carpathian area. During centuries, the Romanian territory has been shaken by strong earthquakes, most of them being centered within Vrancea Zone, which is situated at the bending area of the South-Eastern Carpathians. Most of the zones from extra-Carpathian area are affected by the subcrustal seismic events, where many hydro-technical structures exist, being also exposed to earthquakes action. A detailed analysis of the intensity attenuation laws developed for subcrustal seismic sources was performed using the most recent and complete intensity datasets. We use an extended and combined intensity data including historical and modern, qualitative and quantitative data, i.e. a number of 11 earthquakes occurred during the period 1738-2009 with epicentral/maximum intensities ranging from VII-X MSK degrees, and magnitude Mw from 5.4 to 7.9. All the input data used for testing are resulted after the reevaluation and evaluation of the macroseismic effects produced by the seismic events included in the present study (8697 IDP). The selected attenuation laws were tested for different values of epicentral intensity and with reference to twelve and twenty four azimuthal directions. Besides the testing of the relationships, isoseismal maps based on the selected attenuation laws were accomplished, associated to the biggest possible earthquake (worst scenario) for the Vrancea subcrustal zone, also highlighting the calculated intensities in the selected dam sites. Brief description of the study and used methods. Brief description of the study and used methods.
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