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HOBITSS Experiment

Using ocean-bottom seismic data from the Hikurangi Ocean Bottom Investigation of Tremor and Slow Slip (HOBITSS) experiment we studied the relationship between burst-type or near-repeating earthquakes and an offshore slow slip event that occurred in September/October 2014 offshore of Gisborne, New Zealand. We found near-repeating earthquakes associated with an upper plate fracture network above a subducted seamount after the slow slip event, and propose that the slow slip event caused fluid migration from over-pressured sediments down-dip of the seamount into the upper plate fracture network, triggering further slow slip on preexisting faults.

Shaddox, H.R. and Schwartz, S.Y., 2019, Subducted seamount diverts shallow slow slip to the forearc of the northern Hikurangi subduction zone, New Zealand: Geology, doi: 10.1130/G45810.1.Toll-free link

I am also a co-author on a study done by Jefferson Yarce, evaluating the seismicity that occurred before, during, and after the 2014 Gisborne slow slip event.

Yarce, J., Sheehan, A. F., Nakai, J. S., Schwartz, S. Y., Mochizuki, K., Savage, M. K., Wallace, L. M., Henrys, S. A., Webb, S. C., Ito, Y., Abercrombie, R. E., Fry, B., Shaddox, H. R., and Todd, E. K., 2019, Seismicity at the northern Hikurangi Margin, New Zealand, and investigation of the potential spatial and temporal relationships with a shallow slow slip event: Journal of Geophysical Research: Solid Earth. doi: 10.1029/2018JB017211.Link to article

Anza segment of the San Jacinto fault zone, southern CA

Shaddox, H.R., Schwartz, S.Y., and Bartlow, N. M., 2021, Afterslip and spontaneous aseismic slip on the Anza segment of the San Jacinto fault zone, southern California: Journal of Geophysical Research: Solid Earth. doi: 10.1029/2020JB020460.  Link to article

Seismic detection of internal waves

Shaddox, H. R., Brodsky, E. E., Ramp, S. R., and Davis, K. A., 2021, Seismic detection of oceanic internal gravity waves from subaerial seismometers: AGU Advances, 2, e2021AV000475.  Link to article.