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I use seismic waveforms, typically recorded at or near the surface, to infer physical processes associated with active faulting. Recent interests include earthquake swarms (and associated fluid-faulting interactions) and tectonic tremor. To gain insight into these processes, I have worked to develop new techniques for earthquake detection, source location, and focal mechanism dete
I earned my Ph.D. from Stanford University in 2007, focused on understanding the mechanism of "non-volcanic tremor" in the Nankai subudction zone. After finishing my Ph.D., I was a Miller Postdoctoral Fellow at UC Berkeley and a Mendenhall Postdoctoral Fellow in the USGS Earthquake Science Center. From 2010-2018 I was a Research Geophysicist with the USGS Volcano Science Center (California and Yellowstone Volcano Observatories) in Menlo Park, California. I am now a member of the Geologic Hazards Science Center in Golden, Colorado.
I'm working maximize the information we can obtain from seismic records of faulting processes. This information is then combined with other available constraints (e.g. geodetic, geologic, geochemical) to understand what these seismic signals can tell us about physical (tectonic, hydrothermal, and/or magmatic) processes in the subsurface.
Other Recognitions
2015 - Editor’s Citation for Excellence in Refereeing, Geophysical Research Letters
2014 - Kavli Fellow, National Academy of Sciences
2010 - Editor’s Citation for Excellence in Refereeing, Geophysical Research Letters
Publications
Hill, D.P., E. Montgomery-Brown, D. R. Shelly, A. Flinders, and S. P. Prejean (2020), Post-1978 Tumescence at Long Valley Caldera, California: a Geophysical Perspective, Journal of Volcanology and Geothermal Research, https://doi.org/10.
Absolute versus relative earthquake locations associated with 2019 Ridgecrest, California, foreshock and aftershock sequence. Animated GIF image compares the routine catalog earthquake locations with those from an enhanced catalog employing precise relative locations. Depths are color-coded as shown. Triangles indicate seismic stations.
Absolute versus relative earthquake locations associated with 2019 Ridgecrest, California, foreshock and aftershock sequence. Animated GIF image compares the routine catalog earthquake locations with those from an enhanced catalog employing precise relative locations. Depths are color-coded as shown. Triangles indicate seismic stations.
Schematic cross section of the magmatic and hydrothermal systems underlying Yellowstone Caldera, showing magmatic volatiles emitted during crystallization of the rhyolitic magma and/or from basalt intrusions or convection, and the hypothesized relation with earthquake swarms on the caldera margins. The exsolved fluids accumulate at lithostatic pressures in the
Schematic cross section of the magmatic and hydrothermal systems underlying Yellowstone Caldera, showing magmatic volatiles emitted during crystallization of the rhyolitic magma and/or from basalt intrusions or convection, and the hypothesized relation with earthquake swarms on the caldera margins. The exsolved fluids accumulate at lithostatic pressures in the
Absolute versus relative earthquake locations associated with 2019 Ridgecrest, California, foreshock and aftershock sequence. Animated GIF image compares the routine catalog earthquake locations with those from an enhanced catalog employing precise relative locations. Depths are color-coded as shown. Triangles indicate seismic stations.
Absolute versus relative earthquake locations associated with 2019 Ridgecrest, California, foreshock and aftershock sequence. Animated GIF image compares the routine catalog earthquake locations with those from an enhanced catalog employing precise relative locations. Depths are color-coded as shown. Triangles indicate seismic stations.
Schematic cross section of the magmatic and hydrothermal systems underlying Yellowstone Caldera, showing magmatic volatiles emitted during crystallization of the rhyolitic magma and/or from basalt intrusions or convection, and the hypothesized relation with earthquake swarms on the caldera margins. The exsolved fluids accumulate at lithostatic pressures in the
Schematic cross section of the magmatic and hydrothermal systems underlying Yellowstone Caldera, showing magmatic volatiles emitted during crystallization of the rhyolitic magma and/or from basalt intrusions or convection, and the hypothesized relation with earthquake swarms on the caldera margins. The exsolved fluids accumulate at lithostatic pressures in the