Spatial distribution of seismic energy rate of tectonic tremors in subduction zones
Spatial distribution of seismic energy rate of tectonic tremors in subduction zones
复制标题
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
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
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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DOI:
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