地震研究

为研究构造复杂的关东盆地及其周边地区的地震动衰减特性,根据地震震源机制解和Slab1.0模型,依据前人提出的日本地区地震构造类型划分方法给出所研究地震的构造类型,并依据地震构造类型及空间分布划分了3个研究区域。利用单步非参数化广义谱反演方法分析了3个区域的地震动衰减特性。结果表明:区域Ⅰ中发生于陆地的浅地壳地震的地震动路径衰减较弱,远距离处近似不出现路径衰减,频率相关的非弹性衰减较弱,品质因子Q=92.33f 1.87; 区域Ⅱ中,发生于陆地的上地幔地震的地震动路径衰减的下降速率随距离增大而增大,频率相关的非弹性衰减较强,Q=27.75f 1.08; 区域Ⅲ中,发生于近海的浅层地壳和上地幔地震的地震动路径衰减兼具区域Ⅰ、Ⅱ的衰减属性,Q=58.07f 0.89。

In order to study the characteristics of the ground motion attenuation of the complex plate tectonics of the Kanto basin and its vicinity in Japan,on the basis of the focal mechanism and Slab1.0 model,and according to the earthquake classification scheme adapted for Japan proposed by previous studies,we decided the categories of the earthquake events,and on this basis we further divided the study region into three parts.Then we used the method of One-step Nonparametric Generalized Spectrum Inversion to analyze the attenuation characteristics of ground vibrations in the three regions.The results show that in Region 1,the path attenuation of the ground motion of the shallow-crust earthquakes occurring inland is weak; there is almost no attenuation in long distance.The frequency-dependent inelastic attenuation is also weak.The quality factor Q=92.33f 1.87.In Region 2,the decay rate of the path attenuation of the upper-mantle earthquake inland increases with the increase of distance.The frequency-dependent inelastic attenuation is stronger.The quality factor Q=27.75f 1.08.In Region 3,the path attenuation of the ground motion of the shallow-crust and upper-mantle earthquakes in the offshore area has the same attributes of the path attenuation in the first two regions.The quality factor Q=58.07f 0.89.

引言
1 研究方法
2 地震动数据
3 结果与讨论
4 结论

图1 广义谱反演选用的地震、台站分布及根据地震构造类型划分的3个研究区域(a)以及各区域的地震波传播路径示意图(b)<br/>Fig.1 Locations of earthquakes and strong-motion stations used for generalized inversion,and three regions divided according to the types of seismotectonics(a),and schematic diagram of propagating path of seismic waves in each region(b)

图1 广义谱反演选用的地震、台站分布及根据地震构造类型划分的3个研究区域(a)以及各区域的地震波传播路径示意图(b)
Fig.1 Locations of earthquakes and strong-motion stations used for generalized inversion,and three regions divided according to the types of seismotectonics(a),and schematic diagram of propagating path of seismic waves in each region(b)

图2 区域Ⅰ(a)、区域Ⅱ(b)、区域Ⅲ(c)中所选记录的震级-震源距分布图<br/>Fig.2 Distribution of magnitude vs.hypocentraldistance of recordings used in Region 1(a),Region 2(b),and Region 3(c)

图2 区域Ⅰ(a)、区域Ⅱ(b)、区域Ⅲ(c)中所选记录的震级-震源距分布图
Fig.2 Distribution of magnitude vs.hypocentraldistance of recordings used in Region 1(a),Region 2(b),and Region 3(c)

图3 区域Ⅰ(a)、区域Ⅱ(b)、区域Ⅲ(c)的路径衰减曲线<br/>Fig.3 Attenuation function curves of Region 1(a),Region 2(b),and Region 3(c)

图3 区域Ⅰ(a)、区域Ⅱ(b)、区域Ⅲ(c)的路径衰减曲线
Fig.3 Attenuation function curves of Region 1(a),Region 2(b),and Region 3(c)

图4 各区域的品质因子<br/>Fig.4 Frequency-dependent S-wave quality factors for each region

图4 各区域的品质因子
Fig.4 Frequency-dependent S-wave quality factors for each region

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备注

引言

1 研究方法

2 地震动数据

3 结果与讨论

4 结论

期刊信息