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Gcent: Geodetic Centroid Products for Earthquake Monitoring

Description: 

This presentation provides an overview and update of the Geodetic Centroid (gCent) catalog – a satellite imagery-derived earthquake centroid catalog developed for regional and global earthquake response. Geodetic remote sensing imagery from optical correlation (“pixel tracking”) and interferometric synthetic aperture radar (InSAR) serve an increasingly diverse and important role in earthquake monitoring and response. The geodetic observations provide precise information for determining the finite fault characteristics of moderate to large (magnitude 5 and larger) terrestrial and near-shore earthquakes that compliment seismological approaches. This source information in turn directly informs USGS/Advanced National Seismic System (ANSS) Finite Fault Model, ShakeMap, and PAGER products. Since late 2019, we have systematically processed satellite imagery of earthquakes magnitude 5.5 and larger, PAGER Yellow and above, and other earthquakes of unique interest. We then derive source models of earthquakes that produce measurable surface displacements. This effort has led to a growing earthquake catalog that currently includes >120 earthquakes spanning M4.1-M7.8. In this presentation, I will give an overview of the rationale for and production of the gCent catalog, highlight key contributions of gCent products in ANSS/USGS earthquake response efforts, and detail future developments for gCent products and the gCent catalog.

Session: Network Seismology: Recent Developments, Challenges and Lessons Learned - IV

Type: Oral

Date: 5/2/2024

Presentation Time: 11:15 AM (local time)

Presenting Author: William

Student Presenter: No

Invited Presentation: 

Authors