Crustal modification by tectonic events and upper mantle anisotropy beneath the Midcontinent Rift and New Madrid Seismic Zone: insights from receiver function studies and teleseismic shear wave splitting
"The earth's crust and upper mantle have been continually modified by tectonic processes such as rifting, earthquake activity. In this dissertation, shear wave splitting and receiver function techniques were employed to study the extent of crustal and upper mantle modifications beneath the New Madrid Seismic Zone (NMSZ) and the Midcontinent Rift (MCR). Shear wave splitting analysis in the MCR reveals the presence of fossilised anisotropy along the rift axis...In the NMSZ, anticipated rift-parallel fast directions associated with vertical magmatic dikes or along-rift flow, rift-orthogonal fast directions from small-scale convection, or reduction in splitting times as a result of vertical asthenospheric flow are not observed, suggesting that the NMSZ is a shallow feature. Shear-wave splitting parameters for the NMSZ suggest complex anisotropy which fit well with a double layer model with the lower layer fixed at APM direction"--Abstract, page iii.
Gao, Stephen S.
Atekwana, Estella A.
Hogan, John Patrick
Rogers, J. David
Geosciences and Geological and Petroleum Engineering
Ph. D. in Geology and Geophysics
Missouri University of Science and Technology
xii, 132 pages
New Madrid Seismic Zone
© 2009 Moikwathai Moidaki, All rights reserved.
Dissertation - Open Access
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Moidaki, Moikwathai, "Crustal modification by tectonic events and upper mantle anisotropy beneath the Midcontinent Rift and New Madrid Seismic Zone: insights from receiver function studies and teleseismic shear wave splitting" (2009). Doctoral Dissertations. 1994.