基于日本滨海强震数据的不同震源类型的衰减关系比较

发布时间：2018-04-08 13:29

本文选题：滨海区域　切入点：不同震源　出处：《建筑结构》2017年S1期

【摘要】：滨海区域多处于板块交界处,地震地质情况复杂,可能会受到不同震源类型地震的影响。为揭示滨海复杂板块区域不同震源类型地震的地震动衰减特征的差异,以日本东部复杂板块区域的四类典型地震——浅地壳地震、上地幔地震、俯冲带板缘地震和俯冲带板内地震为研究对象,基于上述各类地震中滨海场地记录到的951条地震记录,并考虑其场地条件,对各类地震动分别拟合建立地震动峰值加速度(PGA)和加速度反应谱参数的衰减关系。通过比较所建立模型与现有模型,并且分析不同类型震源衰减关系的差异,验证了建立的滨海复杂震源地震动衰减关系的合理性;与浅地壳地震相比,俯冲带板内地震和俯冲带板缘地震的PGA较大、衰减较快,上地幔地震的PGA较小、衰减较慢;对于衰减模型预测的加速度反应谱,在近场短周期,俯冲带板内地震最大,上地幔地震最小。研究结果揭示了滨海不同震源的地震动衰减关系的差异,可为此区域的地震危险性分析和抗震设防提供参考。
[Abstract]:The coastal area is mostly located at the boundary of the plate, and the seismic geology is complex, which may be affected by the earthquake of different focal types.In order to reveal the difference of seismic attenuation characteristics between different focal types of earthquakes in the complex plate region of Binhai, four types of typical earthquakes in the complex plate region of eastern Japan-shallow crust earthquakes and upper mantle earthquakes are used.Based on the 951 seismic records recorded in the coastal sites of the above mentioned earthquakes, and considering the site conditions, the subduction zone plate margin earthquakes and the subduction zone intraplate earthquakes are taken as the research objects.The attenuation relationship between peak acceleration (PGA) and acceleration response spectrum parameters of ground motion was established by fitting each kind of ground motion.By comparing the established model with the existing model, and analyzing the difference of attenuation relations between different types of earthquake sources, the rationality of the established attenuation relationship of the seaside complex focal ground motion is verified, which is compared with the shallow crust earthquake.The PGA of intraplate earthquakes in subduction zone and earthquake in the edge of subduction zone is larger, and the attenuation is faster, the PGA of upper mantle earthquake is smaller and the attenuation is slower, for the acceleration response spectrum predicted by attenuation model, the earthquake in subduction zone is the largest in the near field short period.The upper mantle earthquake is the smallest.The results of the study reveal the difference of the attenuation relationship of earthquake ground motion in different seashore sources, which can be used as a reference for seismic hazard analysis and seismic fortification in this area.
【作者单位】：中国地震局工程力学研究所;中国地震局地震工程与工程振动重点实验室;
【基金】：国家自然科学基金项目(51578516,51238012) 中国地震局工程力学研究所基本科研业务费专项资助项目(2014B06,2016A01,2016A04)
【分类号】：P315

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