Small-scale scattering heterogeneities beneath the northern Tien Shan from the teleseismic P wavefield

Small-scale scattering heterogeneities beneath the northern Tien Shan from the teleseismic P wavefield
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远震 P 波场显示北天山下方的小尺度散射不均匀性

DOI:
10.1186/s40623-020-1136-1
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发表时间:
2020-02
影响因子:
3
通讯作者:
Huang Zongying
Huang Zongying
中科院分区:
地球科学3区
文献类型:
--
作者:
Ma Xiaolong;Huang Zongying

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为了研究北方天山下的小尺度散射不均匀性,我们分析了地震事件的P波场。本文采用微扰涨落法,在0.1- 8.0Hz的频带内,将总波场分解为相干部分和涨落部分。随后,我们调查的散射特性,通过分析的相干和波动波场的频率依赖的强度在0.3和2.5 Hz之间。我们进一步约束的速度扰动和相关长度通过模拟的P波尾波包络的Monte Carlo模拟。在北方天山下发现了很强的散射不均匀性。首选的散射模型可以描述为一个~ 55- 130公里厚的随机非均匀层,速度扰动为6-9%,相关长度为0.4公里。我们把这些小尺度的散射体归因于上涌热地幔物质中孤立的熔体口袋。
In order to investigate the small-scale scattering heterogeneities underneath the northern Tien Shan, we analyze the P wavefield from teleseismic events. By using the teleseismic fluctuation method, we separate the total wavefield into coherent and fluctuating parts in the frequency band of 0.1–8.0 Hz. Subsequently, we investigate the scattering characteristics by analyzing the frequency-dependent intensities of the coherent and fluctuating wavefield between 0.3 and 2.5 Hz. We further constrain the velocity perturbations and correlation lengths by modeling the P-wave coda envelope with the Monte Carlo simulation. Strong scattering heterogeneities are revealed beneath the northern Tien Shan. The preferred scattering model can be described as a ~ 55- to 130-km-thick randomly heterogeneous layer with velocity perturbations of 6–9% and correlation lengths on the order of 0.4 km. We attribute these small-scale scatterers to isolated melt pockets from the upwelling hot mantle materials.
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