Group B, Poster #036, Seismology
Evaluating Relative Relocation Methods in a Synthetic Setting: The Case of the 2019 Ridgecrest Earthquake Sequence
Poster Image:
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Poster Presentation
2023 SCEC Annual Meeting, Poster #036, SCEC Contribution #13103 VIEW PDF
use a controlled experiment to explore differences in these location methods with synthetic arrival times based on the setting of the 2019 Ridgecrest earthquake sequence. We calculated travel times using the Fast Marching Method, with synthetic hypocenters randomly shuffled relative to the SCEDC catalog. The 3D velocity model is extracted from the SCEC Community Velocity Model with a von Karman model superimposed to represent unmodeled small scale structure. We use the two relocation methods with a 1D velocity model to recover the hypocenters. Our preliminary results indicate that station coverage significantly influences the performance of both methods, particularly in terms of depth accuracy. Our results suggest that HypoDD displays greater resiliency to both unmodelled Earth structure and incorrect initial absolute locations, while GrowClust demonstrates higher computational efficiency and robustness when dealing with poorly constrained events.
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