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Full-Text Articles in Physical Sciences and Mathematics
Geometry Of Continental Normal Faults: Seismological Constraints, Jochen Braunmiller, John L. Nabalek
Geometry Of Continental Normal Faults: Seismological Constraints, Jochen Braunmiller, John L. Nabalek
School of Geosciences Faculty and Staff Publications
Teleseismic body waves from large earthquakes are used to study the downdip geometry of continental normal faults in the Aegean. Waveform modeling techniques together with rigorous statistical tests are applied to put firm bounds on the amount of downdip curvature of these faults and the role of coseismic slip on a basal detachment. Synthetic modeling shows that good azimuthal station coverage and inclusion of SH waves are necessary to resolve fault curvature. The data indicate ruptures of the Aegean events occurred on planar faults extending across the entire brittle portion of the crust. No seismogenic low-angle detachment faulting at the …
How Rigid Is The Stable Interior Of The North American Plate?, Timothy H. Dixon, Ailin Mao, Seth Stein
How Rigid Is The Stable Interior Of The North American Plate?, Timothy H. Dixon, Ailin Mao, Seth Stein
School of Geosciences Faculty and Staff Publications
We analyze data from eight permanent GPS stations broadly distributed through the interior of the North American plate, and use the resulting velocities to estimate an Euler vector describing motion of “stable” North America as a single rigid plate. The site velocities fit the single plate model with a mean residual of 1.3 mm/yr. The residuals do not appear to reflect post-glacial rebound, and tests for differential motion between eastern and western North America at the New Madrid seismic zone show no resolvable motion within uncertainties. The residuals likely reflect observational error, and thus our estimate of the stability of …