Waveform complexity in teleseismic broadband SH displacements: Slab diffractions or deep mantle reflections?

Waveform Complexity in Teleseismic Broadband Sh Displacements: Slab Diffractions or Deep Mantle Reflections?

Transverse component bodywave ground displacements from deep focus earthquakes exhibit complexities which are not accounted for by standard radially symmetric Earth models. This anomalous behavior is examined using 123 broadband teleseismic SH displacement recordings, reconstituted from shortand long-period or broadband seismograms for 11 events in the Kurile subduction zone. The greatest compl...

Preface: Deep Slab and Mantle Dynamics

Calibration of 3d Upper Mantle Structure in Eurasia Using Regional and Teleseismic Full Waveform Seismic Data

We present progress in the development of a new approach to develop and evaluate earth models at the regional scale that utilizes full waveform seismograms. We have implemented an approach which relies on a cascade of increasingly accurate theoretical approximations for the computation of the seismic wavefield, with the goal to develop a model of regional structure for a subregion of Southeast ...

The deforming Nazca slab in the mantle transition zone and lower mantle: Constraints from teleseismic tomography on the deeply subducted slab between 6°S and 32°S

We present new tomographic models of the Nazca slab under South America from 6°S to 32°S, and from 95 km to lower mantle (895 km) depths. By combining data from 14 separate networks in the central Andes, we use finite-frequency teleseismic P-wave tomography to image the Nazca slab from the upper mantle into the mantle transition zone (MTZ) and the uppermost lower mantle on a regional scale. Our...

Upper-mantle structures beneath USArray derived from waveform complexity

U23D-0061. Schmandt, B. & Humphreys, E.D., 2010a. Complex subduction and smallscale convection revealed by body-wave tomography of the western United States upper mantle, Earth planet. Sci. Lett., 297, 435–445. Schmandt, B. & Humphreys, E.D., 2010b. Seismically Imaged Relict Slab from the 55Ma Siletzia Accretion to Northwest USA,Geology submitted. Sigloch, K., McQuarrie, N. & Nolet G., 2006. Me...