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Spatial Extent of Data

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Geodetic Centroid (gCent) Catalog

The gCent Catalog is a repository of earthquake centroids and finite fault source information derived from geodetic observations (Shea & Barnhart, 2022). This database additionally includes the fully processed Interferomatric Synethtic Aperture (InSAR) images (unwrapped interferograms) and line-of-sight (LOS) files that were used to derived the cataloged source parameters. Geodetic observations from InSAR provide valuable measurements of ground displacements caused by earthquakes. These spatially-dense (10s of meters per pixel), near-source observations of ground displacement in turn allow for the well-constrained analysis of the spatial characteristics of earthquakes, including their centroid location, depth, dimensions, orientation, and slip magnitude. These source parameters in turn can inform earthquake response products (i.e., ShakeMap, PAGER) and be used to calibrate or compare seismological information (i.e., ComCat). Additionally, the InSAR images ("interferograms") can provide important details about surface ruptures, secondary ground failure (i.e., surface cracking, triggered fault creep, liquefaction, and landslides) that help to guide post-earthquake field surveys. The proliferation of openly available SAR imagery and more reliable image acquisition frequency yield the opportunity to systematically characterize earthquakes with InSAR and incorporate these results into operational earthquake monitoring.

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Author(s) William D Barnhart, Hannah N Shea
Publication Date 2022-08-18
Beginning Date of Data 2019-08-01
Ending Date of Data 2022-08-17
Data Contact
DOI http://dx.doi.org/10.5066/P9JBE32J
Citation Barnhart, W.D., and Shea, H.N., 2022, Geodetic Centroid (gCent) Catalog: U.S. Geological Survey data release, http://dx.doi.org/10.5066/P9JBE32J.
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Metadata Date 2022-08-18
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Citations of these data No citations of these data are known at this time.
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License http://www.usa.gov/publicdomain/label/1.0/
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Harvest Source: ScienceBase
Harvest Date: 2024-09-03T10:21:07.825Z