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Broadband Ground Motion Simulations for an Earthquake “Doublet” on the Newport-Inglewood and Palos Verdes Faults

Metadata Updated: November 27, 2025

The occurrence and impact of the February 2023 earthquake doublet in Türkiye, where an Mw 7.8 event was followed roughly 9 hours later by an Mw 7.5 event on an adjacent fault, begs the question: What would be the impact of such a sequence in California? As part of the effort to address this question, this Data Release consists of simulated ground motions for a hypothetical doublet scenario on the Newport-Inglewood and Palos Verdes faults in the Los Angeles region. The fault locations and orientations are based on the 2023 USGS National Seismic Hazard Model. The magnitudes are Mw 7.25 for the 84-km Newport-Inglewood rupture and Mw 7.05 for the 70-km Palos Verdes rupture. Broadband ground motions are computed using a combination of deterministic and stochastic approaches for the lower- and higher-frequency components, respectively. The deterministic calculations use the SCEC 3D Community Velocity Model version CVM-S4.26.M01 extracted using the UCVM software platform with a minimum shear velocity of 400 m/s, and the stochastic simulations use a 1D reference model with Vs30-based site-specific adjustments using period-dependent factors. Three-component waveforms are saved on a 1.2 km by 1.2 km grid of points, and PGA, PGV, and spectral accelerations at periods of 0.3, 1.0, and 3.0 s are extracted to produce scenario ShakeMaps. Comparison of the simulated motions with empirical ground-motion models (GMMs) are generally favorable; however, noticeable differences exist due to rupture directivity and basin response effects.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Created Date September 14, 2025
Metadata Updated Date November 27, 2025

Metadata Source

Harvested from DOI USGS DCAT-US

Additional Metadata

Resource Type Dataset
Metadata Created Date September 14, 2025
Metadata Updated Date November 27, 2025
Publisher U.S. Geological Survey
Maintainer
Identifier http://datainventory.doi.gov/id/dataset/usgs-6696c30ad34ecb78f609f65d
Data Last Modified 2024-09-13T00:00:00Z
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://ddi.doi.gov/usgs-data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id 1833a6ef-9891-4422-9e94-8f36ef4272ac
Harvest Source Id 2b80d118-ab3a-48ba-bd93-996bbacefac2
Harvest Source Title DOI USGS DCAT-US
Metadata Type geospatial
Source Datajson Identifier True
Source Hash 40ff06de6b17fb856b90efb947d5c477de14def68db8dd70a66d21beb28aca69
Source Schema Version 1.1

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