Introduction to the DFDM
We implement the distributional finite difference method for 3D seismic wave propagation, which show promise for improving accuracy, flexibility, and efficie...
GitHubProf. Barbara Romanowicz
Professor of the Graduate School, Department of Earth and Planetary Science, UC Berkeley
research-papers
Dynamic History of Inner Core
Progressive crystallisation of Earth’s inner core drives convection in the outer core and magnetic field generation. Determining the rate and pattern of inne...
Upper mantle velocity structure can contaminate differential travel-time measurements and bias estimates of inner core anisotropy causing the “Alaska anomaly”
Using a regional tomographic model of the Alaskan upper mantle to predict upper mantle effects on PKP travel times, we show that the signature of the Alaska ...
Array measurements of inner core waves in Alaska show perturbations in direction and travel time by the subducted Pacific plate
Based on the PKPdf observations and our new tomography model of the upper mantle beneath Alaska, we conclude that at least 2 s of the travel time anomaly oft...
Seismic evidence for partial melting at the root of major hot spot plumes
Ultralow-velocity zones are localized regions of extreme material properties detected seismologically at the base of Earth’s mantle. Their nature and role in...
Superplumes from the Core-Mantle Boundary to the Lithosphere: Implications for Heat Flux
Superplumes from the Core-Mantle Boundary to the Lithosphere: Implications for Heat Flux
Waveform Tomography Reveals Channeled Flow at the Base of the Oceanic Asthenosphere
Understanding the relationship between different scales of convection that drive plate motions and hotspot volcanism still eludes geophysicists. Using full-w...
An unsually large ULVZ at the base of the mantle near Hawaii
Here we show remarkable features in the waveforms of S/Sdiff phases of western Pacific events observed at stations in North America that indicate the presenc...
Observation of the elusive PKJKP
We document a high signal to noise phase that agrees with theoretical predictions for PKJKP. Envelope modeling of the PKJKP waveform implies a slightly large...
Origin of the earth's "hum"
Excitation of Earth’s continuous free oscillations by atmosphere-ocean-seafloor coupling
Inferences on Flow at the Base of Earth’s Mantle Based on Seismic Anisotropy
We applied global waveform tomography to model radial anisotropy in the whole mantle. We found that in the last few hundred kilometers near the core-mantle b...
Global anisotropy and the thickness of continents
We show that significant radial anisotropy, with horizontally polarized shear waves travelling faster than those that are vertically polarized, is present un...
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Theoretical wave propagation
Explore seismic wave propagation using normal modes, NACT, and advanced theoretical models for global tomography.
SEMum2
Welcome to the online home of the SEMum2 model, a global radially anisotropic shear-velocity model of the earth’s upper mantle and transition zone.
Instrumenting the Ocean Floor
This is a collaborative project between the Berkeley Seismological Laboratory (BSL) and the Monterey Bay Aquarium Research Institute (MBARI)
useful-tools
Using Git for Team Collaboration
Tutorial on how to use Git and GitHub for team collaboration on a project. Content includes installing, setting up, creating a repository, making commits, un...