Earthquake Energy Calculations From Seismogeodetic Data
Description:
This research extends the RTergpy program, originally developed by our group, to evaluate novel seismogeodetic data and enhance its capabilities for the calculation of radiated seismic energy, particularly in the near-field where traditional weak-motion seismometers can quickly go off scale during strong shaking. Seismogeodetic data is a combined data product that incorporates both real-time positioning from GNSS with high-rate accelerations from collocated accelerometers and has been shown to approximate the moment magnitude of nearby offshore ruptures accurately and rapidly. This data stream provides an opportunity to synchronously calculate radiated energy that can be compared with seismic moment to assess whether an event is likely to be a slow rupturing tsunami earthquake through the log of the energy-to-moment ratio, described as the Theta parameter (Newman and Okal, 1998). In addition to energy, RTergpy includes functionality for evaluating the change in energy over time for a per-second assessment of rupture behavior. In the far-field, we have shown this method to be beneficial for additionally estimating earthquake rupture duration (another parameter that identifies slow tsunami earthquakes). RTergpy directly incorporates one such estimate called at the maximum of the Time-Averaged Cumulative Energy Rate (TACER) as described in Convers and Newman (2013). We are directly assessing the performance, and any process improvements needed for utilizing seismogeodetic data for such calculations. The data is being processed similarly to seismic data, only ignoring instrument response as the seismogeodetic data is pre-processed. This indicates no additional calibrations should be needed. Preliminary results show that near-field outputs from seismogeodetic data closely match those from seismic data for smaller events. These new tools are proving extremely valuable for improving rapid earthquake and tsunami risk assessments.
Session: Advances in Reliable Earthquake Source Parameter Estimation [Poster]
Type: Poster
Date: 4/16/2025
Presentation Time: 08:00 AM (local time)
Presenting Author: Hiba
Student Presenter: Yes
Invited Presentation:
Poster Number: 29
Authors
Hiba Kunwer Presenting Author Corresponding Author hkunwer3@gatech.edu Georgia Institute of Technology |
Andrew Newman anewman@gatech.edu Georgia Institute of Technology |
Barry Hirshorn barryhirshorn@mac.com University of California, San Diego |
Yehuda Bock ybock@ucsd.edu University of California, San Diego |
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Earthquake Energy Calculations From Seismogeodetic Data
Category
Advances in Reliable Earthquake Source Parameter Estimation