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.

Name thesis:degree_name

Ph. D. in Geology and Geophysics

Grantor

Missouri University of Science and Technology

Year dc:date.available

2016

Author dc:creator

• Moidaki, Moikwathai

• Geology
• Geophysics and Seismology

Repository record dc:identifier

https://scholarsmine.mst.edu/doctoral_dissertations/1994

OAI identifier oai:identifier

oai:scholarsmine.mst.edu:doctoral_dissertations-2996