【作者】 常银辉；

【导师】 李山有；

【作者基本信息】 中国地震局工程力学研究所 ， 防灾减灾工程及防护工程， 2012， 硕士

【摘要】 地震烈度衰减关系是进行地震灾害评估、地震预警烈度估算以及结构物地震破坏机理和抗震措施研究的重要基础。鉴于点源椭圆衰减模型在估计大地震的烈度影响场时往往存在较大偏差，本文以断层距为距离变量对地震烈度衰减模型开展了进一步的研究。在总结和分析前人研究成果的基础上，本文开展的主要工作如下：（1）搜集了我国大陆地区1913年-2010年6.5级以上，共54次地震的烈度等震线资料，提取了长短轴长度、断层破裂面面积等数据，建立了强震烈度等震线数据库；（2）研究了国内外关于断层破裂长度的估算方法，对3种常见的破裂长度确定方法进行了阐述和对比分析。利用本文的等震线数据库建立了适用于中国的破裂长度-震级统计关系；（3）介绍了可应用于基于断层距的地震衰减关系的统计回归方法。在前人研究基础上提出来一种改进的基于等效断层破裂长度和等效断层距的地震烈度衰减关系的建立方法。利用本文的数据库统计建立了中国大陆地区“基于断层距的地震烈度衰减关系”。更多还原

【Abstract】 The seismic intensity attenuation relationship is a very important basicmaterial for earthquake disaster assessment, estimation of seismic intensityfor early warning and earthquake engineering research. For strongearthquake, the seismogenic fault of which is very long and can not beregarded as a point, so, the point source based seismic intensity ellipticalattenuation model will always over estimate the higher intensity area. In thispaper, a shortest distance to seismogenic fault based seismic intensityattenuation model was studied to overcome the shortage of the point sourcebased intensity elliptical attenuation model.The main research contents and achievements are as follows:1. The earthquakes which were occurred among the year of1913to2010and were from mainland China, the magnitude of which are all largerthan6.5were selected. The information which include the magnitude,intensity isoseismols, long axis’ length and short axis’ length etc of theseearthquakes were collected and a strong earthquake information databasewas constructed by this paper.2. Previous research achivments of abroad and domestics about therupture length estimation methods were studied. So as to choose a methodwhich could be suit to our country, comparison was made between the mainthree estimation methods. As a result, a methed of Zhou(1987) wasrecommended by this paper to estimate the rupture length of Chinesemainland.3. Statistical regression method which can be used to biuld the seismicintensity attenuation relationship was introduced. In the end, a shortestdistance to rupture based intensity attenuation relationship was constructedusing the data from the database that we made.更多还原