A review of a quarter century of International Workshops on Seismic Anisotropy in the crust (0IWSA–12IWSA)
A review of a quarter century of International Workshops on Seismic Anisotropy in the crust (0IWSA–12IWSA)
复制标题
地壳地震各向异性国际研讨会四分之一个世纪的回顾（0IWSA-12IWSA）
DOI：
10.1007/s10950-008-9121-3
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Yuan Gao
中科院分区：
文献类型：
--
作者：
S. Crampin;Yuan Gao
在25年中，在整个地壳中存在方位变化的地震各向异性已经从普遍否认发展到普遍接受，因此许多国际地球物理会议现在都有关于地震各向异性的会议。在此期间，两年一次的地震各向异性国际讲习班（IWSA）记录了地壳中特别是剪切波分裂（地震双折射）的理论、计算、观测和解释方面的许多显著进展。横波分裂是地震波各向异性沿着射线传播路径的一个几乎可靠的指示器。本文回顾了国际地震各向异性协会（IWSA）25年来的13次会议（0 IWSA-12 IWSA）。现在的证据表明，剪切波分裂监测应力对齐流体饱和微裂纹的低水平预破裂变形，几乎所有的地壳中的原地岩石。剪切波分裂表明，微裂纹是如此紧密地间隔开，它们是具有所有普遍性、可计算性、可预测性、“蝴蝶翅膀”敏感性和决定性混沌的关键系统。这导致了一种新的地球物理学，在这种新的地球物理学中，低水平的变形可以用剪切波分裂来监测，未来的行为可以用岩石演化的各向异性孔隙弹性模型来计算预测，在某些情况下甚至可以通过反馈来控制。我们预计新地球物理学将大大振兴IWSA。
In 25 years, the presence of azimuthally varying seismic anisotropy throughout the Earth’s crust has progressed from general denial to universal acceptance, so that many international geophysical meetings now have sessions on seismic anisotropy. Over this period, the proceedings of the biennial series of International Workshops in Seismic Anisotropy (IWSAs) have captured many of the notable advances in the theory, calculation, observation and interpretation of particularly shear-wave splitting (seismic birefringence) in the Earth’s crust. Shear-wave splitting is the almost-infallible indicator of seismic anisotropy along the ray path. This paper reviews 13 IWSA meetings (0IWSA–12IWSA) as a catalogue of 25 years of progress in seismic anisotropy. The evidence now suggests that shear-wave splitting monitors the low-level pre-fracturing deformation of the stress-aligned fluid-saturated microcracks pervading almost all in situ rocks in the crust. Shear-wave splitting indicates that microcracks are so closely spaced they are critical systems with all the universality, calculability, predictability, “butterfly wing’s” sensitivity, and deterministic chaos that that implies. This leads to a New Geophysics, where low-level deformation can be monitored with shear-wave splitting, future behaviour calculated–predicted with the anisotropic poro-elastic model of rock evolution, and in some circumstances even potentially controlled by feedback. We anticipate the New Geophysics will greatly invigorate IWSA.
影响因子：
2.8
作者：
C. MacBeth
通讯作者：
C. MacBeth