利用地震波研究熱點和慢速擴張洋脊下的上地幔：整合地體動力模型與波形模擬(2/2)
Date Issued
2003
Date
2003
Author(s)
DOI
912611M002025
Abstract
Mid-ocean ridges and surface hotspots are two places where active volcanisms occur
on our planet. Using seismological observations as constraints, the goal of our study is to
understand the form of mantle upwelling and melt production at a possible deep-rooted mantle
plume and beneath a slow-spreading ridge segment which are responsible for magma eruption on
the earth’s surface. Seismic experiments on the fast-spreading East-Pacific Rise and
ridge-centered Icelandic hotspot generated numerous high-quality records which indicate the
underlying structures are partially-molten, elastically heterogeneous and anisotropic as well as
attenuated. In these geodynamically-interesting but structurally-complicated environments
expected under discontinuous ridge segments and hotspot tracks, many of the usual approximation
employed in modeling finite-frequency seismic wave propagation break down. This study
explores the effects of velocity heterogeneity and anisotropy associated with temperature and
compositional variations in the upwelling mantle on seismic waveforms by virtue of direct solution
method. Fully understanding of seismic wave behaviors in a complicated structure like the earth
will help data acquisition accusation and interpretation to image the deep mantle structure.
Subjects
parallel computation
seismic wave propagation
anisotropy
mantle plume
Publisher
臺北市：國立臺灣大學地質科學系暨研究所
Type
report
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