Improved Green’s functions for passive-source structural studies
Improved Green’s functions for passive-source structural studies
复制标题
改进了被动源结构研究的格林函数
作者：
J. Mercier;M. Bostock;A. Baig
在过去二十年中，远震接收功能已被证明是研究地壳结构的有用工具。由于它们代表远震-P格林函数的S波分量的一级近似，接收函数提供了与剪切模数相关的物理性质的有价值的信息。然而，隐含地使用P分量地震记录作为震源的替代，排除了恢复涉及压缩模数对比的不连续结构的信息。通过对地震产生的复杂震源时间函数的改进估计进行去卷积，人们可以超越传统的接收函数范例，获得更精确的地球格林函数的近似。利用一种新的反褶积方法，我们给出了加拿大国家地震台网(CNSN)几个台站的远震P-格林函数的P分量的估计，它清楚地显示了接收侧的纯P波地壳多次波。身份..。
Over the past two decades, teleseismic receiver functions have proved to be a useful tool to investigate crustal structure. Because they represent a first-order approximation to the S -wave component of the teleseismic- P Green’s function, receiver functions provide valuable information on physical properties related to shear modulus. However, the implicit use of the P -component seismogram as a proxy for the source precludes the recovery of information on discontinuous structure involving contrasts in compressional modulus. By deconvolving improved estimates of complex source time functions generated by earthquakes, one may move beyond the conventional receiver function paradigm to a more accurate approximation of the earth’s Green’s function. Using a new deconvolution method, we present estimates of the P -component of the teleseismic- P Green’s functions at several stations of the Canadian National Seismic Network (CNSN) that clearly show the receiver-side pure P -wave crustal multiple. The identificat...