We investigate whether a shallow-dipping thrust fault is prone to waveslip interactions via surface-reflected waves affecting the dynamic slip. If so, can these interactions create faults that are opaque to radiated energy? Furthermore, in this case of a shallow-dipping thrust fault, can incorrectly assuming a transparent fault while using dislocation theory lead to underestimates of seismic mo...

Estimates of the radiated seismic energy based on teleseismic and regional data often differ by up to an order of magnitude, with a tendency for regional estimates to be larger than teleseismic estimates for the same event. In this study we compare the velocity spectrum determined from teleseismic data after correction for radiation pattern and propagation effects, with the velocity spectrum de...

This project is aimed at applying recently modified array signal processing techniques to the problem of detecting and estimating mixtures of signals observed on teleseismic and regional arrays. We are developing new techniques for enhancing both signal detection and estimation of azimuth and phase velocity parameters. In particular, we seek an automated detection procedure that sequentially is...

We develop a new way to remove free-surface multiples from teleseismic Ptransmission and constructed reflection responses. We consider two types of teleseismic waves with the presence of the free surface: One is the recorded waves under the real transmission geometry; the other is the constructed waves under a virtual reflection geometry. The theory presented is limited to 1D plane wave acousti...

S U M M A R Y A recently developed stacking scheme called dual bootstrap stack (DBS) is applied to teleseismic migration, using deep earthquakes in South America as sources and USArray as receivers. Built with statistical tests for signal significance and coherence, DBS can achieve a clean separation of signal and noise, and unlike conventional non-linear stacks such as Nth-root stack (NRS) and...

Resolving earthquake parameters, especially depth, is difficult for events occurring within basins because of issues involved with separating source properties from propagational path effects. Here, we demonstrate some advantages of using a combination of teleseismic and regional waveform data to improve resolution following a bootstrapping approach. Local SS-S differential arrivals from a fore...

rf method is now a well-known tool for studying crustal and upper mantle structure when such a complete data set is available. we compute p receiver functions to investigate the upper mantle discontinuity beneath the northwest of iran. we selected data from teleseismic events (mb ? 5.5, 30 ?>? > 95?) recorded from 1995 to 2008 at 8 three component short period stations from tabriz telemetry sei...