SCEC Award Number 16280 View PDF
Proposal Category Individual Proposal (Data Gathering and Products)
Proposal Title Catalog of High-Rate GNSS and Heterogeneous Data Sets for Kinematic Slip Models and Postseismic Slip
Investigator(s)
Name Organization
Yehuda Bock University of California, San Diego
Other Participants Jennifer Haase
Dara Goldberg
Jessie Saunders
SCEC Priorities 1b, 5d, 1e SCEC Groups FARM, SDOT, Geodesy
Report Due Date 03/15/2017 Date Report Submitted 08/21/2017
Project Abstract
 Seismogeodesy, the optimal combination of GPS and seismic data, provides distinct advantages compared to GPS and seismic data alone. To date, more than 10 earthquakes have been studied with seismogeodetic data, in various tectonic settings and over a range of magnitudes. We now have an exceptional database that can be used to address relationships among depth dependent fault properties and earthquake slip, and in support of earthquake and local tsunami warning systems. We have streamlined and automated to the extent possible the analysis of GNSS and seismogeodetic data using in-house precise point positioning software with Kalman filters, and developed a hierarchy of modules for real-time earthquake and local tsunami warning and rapid response systems. We have extended the displacement and seismic velocity time series for a growing catalog of earthquakes into the period of preseismic and early onset postseismic deformation and beyond. The latter contributes to improvements in the CGM by delineating transient deformation that differs from the steady state tectonic motion to test hypotheses on rupture properties and examine deviations from typical behavior.
Intellectual Merit The research has contributed to improvements in earthquake early warning and rapid response, as well tsunami prediction, using seismogeodesy. Creative concepts using seismogeodetic displacement and velocity waveforms for: earthquake detection and locations, earthquake magnitude scaling relationships, finite CMT solutions, and static and kinematic finite-fault slip inversions for thrust and strike-slip environments. Seismogeodesy resolves the magnitude saturation problem associated with seismic-only systems and allows rapid results (fault models by the end of seismic shaking) using data collected within the earthquake's epicentral region, where most damage to people and infrastructure occur. This has been facilitated by access to a catalog of historical earthquake of seismogeodetic data.
Broader Impacts Our SCEC funding last year and previous years has supported directly or indirectly four graduate students at SIO (two female – D. Goldberg and J. Saunders, one Hispanic – D. Melgar; and B. Crowell) and a postdoctoral researcher (J. Geng). Two former PhD students are now working on the ShakeAlert earthquake early warning system, at U Washington (B. Crowell) and UC Berkeley (D. Melgar). The project has also contributed to infrastructure and seismogeodetic data openly available to the community, including 25 seismogeodetic upgrades (15 in SoCal and 10 in the San Francisco Bay Area). Data are archived at SCEDC, UNAVCO, IRIS and SOPAC. The funding has contributed to mitigation of the effects of natural hazards (earthquakes and local tsunamis), a direct benefit to society.
Exemplary Figure Figure 1. Advantages of seismogeodetic data compared to GPS and seismic data alone. Prepared by Yehuda Bock.