Spatial distribution of seismic energy rate of tectonic tremors in subduction zones

Spatial distribution of seismic energy rate of tectonic tremors in subduction zones
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俯冲带构造震动地震能量率空间分布

DOI:
10.1002/2014jb011383
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发表时间:
2014
影响因子:
--
通讯作者:
S. Yabe and S. Ide
S. Yabe and S. Ide
中科院分区:
--
文献类型:
--
作者:
K. Sadakane;Y. Horikawa;M. Nagao;and H. Seto;S. Yabe and S. Ide

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深部构造震动的大小从来没有被准确地评估为一个物理量。在这里,我们估计震颤大小为2-8 Hz的带限地震能量率,准确评估了四个俯冲带(南开、卡斯卡迪亚、哈利斯科和南智利)地震波的路径衰减和场地放大。地震能量率的大小-频率统计,其特征在于每个子区域的中值测量,是空间可变的。空间变化分为三种类型,每种类型对应于不同的地震迁移行为。在A型地区,地震带较宽,地震能量率在倾向方向上变化很大,地震活动通常在能量较小的地震带中开始。其中一些进一步渗透到充满活力的震颤区,随后迁移的走向方向上的长距离。类型B区域的特征在于相对较窄的地震带、倾向方向上能量率的微小变化以及走向方向上的长距离迁移。C型地区的特点是孤立的集群的震颤活动没有迁移和独立的故障,每个小的震颤集群。考虑到地震能量率的空间分布反映了板块界面强度的不均匀性,这种分布(由地震带宽度控制)可能决定慢地震行为的区域风格。一些高能震颤区域充当触发大的慢滑事件的开关,特别是在A型区域中。
The sizes of deep tectonic tremors have never been accurately evaluated as a physical quantity. Here we estimate tremor size as the band‐limited seismic energy rate at 2–8 Hz, with accurate evaluation of the path attenuation and site amplification of seismic waves in four subduction zones: Nankai, Cascadia, Jalisco, and South Chile. The size‐frequency statistics of seismic energy rate, which are characterized by the median measure for each subregion, are spatially variable. The spatial variations are categorized into three types, with each type corresponding to a different tremor migration behavior. In type A regions where tremor zone is wider, seismic energy rates are highly variable in the dip direction, and tremor activities are usually initiated in the less energetic tremor zone. Some of them further penetrate into the energetic tremor zone and subsequently migrate for long distances in the strike direction. Type B regions are characterized by relatively narrow tremor zones, minor variations in energy rates in the dip direction, and long‐distance migration in the strike direction. Type C regions are characterized by isolated clusters of tremor activities without migration and by independent failure of each small tremor cluster. Given that the spatial distributions of tremor energy rates reflect heterogeneities in the strength of the plate interface, such distributions, which would be controlled by the width of tremor zone, may determine the regional style of slow‐earthquake behavior. Some energetic tremor regions act as switches that trigger large slow slip events, especially in type A regions.
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