The InSAR-derived gCent Earthquake Catalog: August 2019-August 2020
Session: Modern Geodesy for Observation and Its Modeling of Earthquake Deformation [Poster]
Type: Poster
Date: 4/19/2021
Presentation Time: 03:45 PM Pacific
Description:
Geodetic observations of earthquakes provide valuable constraints on the spatial characteristics of the ruptured fault including the location, orientation, and dimensions of the fault. These measurements and their associated models compliment seismological observations by providing independent constraints on the earthquake. In some cases, geodetic finite fault models can be incorporated directly into earthquake response products, such as USGS/ANSS ShakeMaps.
Systematic acquisition and increased availability of interferometric synthetic aperture radar (InSAR) now make it tractable to undertake systematic global earthquake analysis with geodesy. Recognizing these capabilities, we introduced the Geodetic Centroid (gCent) Project in 2019. This presentation provides an overview of the gCent project and the first-year catalog that we generated from InSAR observations. Under gCent, we process Sentinel-1 interferograms of all earthquakes >Mw 5.5 with depths < 25 km (all events >Mw 7) and located beneath or immediately adjacent to land, as well as smaller events of special interest. From August 2019 to August 2020 we processed 65 earthquakes and successfully imaged 29 earthquakes ranging from Mw 4.8 to Mw 7.4. We present source descriptions of these events that include fault location (longitude, latitude, depth), fault geometry (strike, dip, rake, length, width), and the slip characteristics (slip magnitude and slip direction). We additionally present comparisons between the derived products of our catalog (i.e., locations and fault geometries) and the USGS/ANSS Comprehensive Catalog (ComCat) and the Global CMT catalog. This project represents an effort to report earthquake solutions generated from InSAR and highlight comparisons with seismic global earthquake catalogs to provide additional constraints.
Presenting Author: Hannah N. Shea
Student Presenter: Yes
Authors
Hannah Shea Presenting Author Corresponding Author hannah-shea@uiowa.edu University of Iowa |
William Barnhart william-barnhart-1@uiowa.edu University of Iowa |
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The InSAR-derived gCent Earthquake Catalog: August 2019-August 2020
Category
Modern Geodesy for Observation and and Its Modeling of Earthquake Deformation