FREQUENCY-DEPENDENCE OF FRACTURE STIFFNESS

被引：59

作者：

PYRAKNOLTE, LJ ^{[1
]}

NOLTE, DD ^{[1
]}

机构：

[1] PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907

来源：

GEOPHYSICAL RESEARCH LETTERS | 1992年 / 19卷 / 03期

关键词：

D O I：

10.1029/91GL03179

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The frequency dependence of fracture specific stiffness, for seismic or ultrasonic wave transmission, is shown to be a simple scaling property of fractures with spatially inhomogeneous distributions of stiffness. Different frequencies sample different subsets of the fracture geometry. Therefore the frequency dependence may be a simple consequence of fracture geometry and requires no additional dynamical mechanism. In this letter, the dynamic fracture stiffness is determined based on the displacement discontinuity model for wave transmission across a fracture. Local transmission coefficients are assumed to depend on the local static stiffness. For a fracture with a single value of static stiffness, the dynamic stiffness is frequency independent. A strongly inhomogeneous distribution of fracture stiffnesses produces a strong frequency dependence for the dynamic stiffness.

引用

页码：325 / 328

页数：4

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