Reviewing 4 Decades of the Puerto Rico Seismic Network Catalog: From Catalog Correction and Homogenization to Declustering.
Description:
The PRSN earthquake catalog consists of more than 70,000 events collected since 1986. In preparation for further research and planned update to the seismic hazard map, a review of the entire catalog was conducted to clean up duplicates, remove events outside the area of responsibility, recompute the magnitude of some events due to incorrect parameters and/or the misuse of station channels, among other data preparation activities. This process involved the use of the single solution files to understand the causes of some issues found, and then to correct them (e.g. none or not calibrated factors in particular station channels). Data products developed as a result of this research include a new corrected catalog, a proposal of new station calibration factors for some particular stations and channels, and correlation equations between seismic magnitude scales (Md, Ml, Mw).
Additionally, the obtained catalog was homogenized to the moment magnitude scale Mw, and processed, using the python library OpenQuake, to perform a Catalog Declustering using the methods of Gardner and Knopoff, Musson, Reasenberg, and Zaliapin. 8,437 events were defined as mainshocks by the Zaliapin method, and Reasenberg and Gardner and Knopoff showed a similar behavior with 49,667 and 52,138 total mainshocks identified respectively. Of these events, 4,788 events were consistently identified across all methods as mainshocks. Furthermore, 6 geographic clusters were identified which match the Mona Canyon, 19° N, Sombrero, South Lajas, and Great Southern Puerto Rico fault zones, and provide additional information to the Guanica area due to the seismic activity in late 2019 and early 2020.
Session: 2025 Puerto Rico and the U.S. Virgin Islands National Seismic Hazard Model Update [Poster]
Type: Poster
Date: 4/18/2023
Presentation Time: 08:00 AM (local time)
Presenting Author: Daniel M. Chacon
Student Presenter: Yes
Invited Presentation:
Authors
Daniel Chacon Presenting Author Corresponding Author daniel.chacon@upr.edu University of Puerto Rico, Mayagüez |
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Reviewing 4 Decades of the Puerto Rico Seismic Network Catalog: From Catalog Correction and Homogenization to Declustering.
Category
2025 Puerto Rico and the U.S. Virgin Islands National Seismic Hazard Model Update