NLL-SSST-coherence high-precision earthquake location catalog for the M 7.0, 2024 Offshore Cape Mendocino, California earthquake sequence

Hypocenter catalog files and visualization of high-precision, NLL-SSST-coherence earthquake locations for the M 7.0, 2024 Offshore Cape Mendocino, California earthquake sequence and background seismicity 1990-01-01 to 2025-01-02).

NLL-SSST-coherence (Lomax and Savvaidis, 2022; Lomax and Henry, 2023; Lomax et al., 2024) is an enhanced, absolute-timing earthquake location procedure which 1) iteratively generates spatially varying travel-time corrections to improve multi-scale location precision and 2) uses waveform similarity to improve fine-scale location precision.

Relocations performed with phase arrival data available from https://service.ncedc.org

Seismic velocity model is a smooth, slowness-mean of two velocity models:The MEN model from: Oppenheimer, D.H., Klein, F.W., Eaton, J.P. & Lester, F.W., 1993. The Northern California Seismic Network bulletin, January-December 1992 ( No. 93–578). Open-File Report, U.S. Geological Survey,. doi:10.3133/ofr93578A representative profile of the offshore model from: Henstock, T.J. & Levander, A., 2003. Structure and seismotectonics of the Mendocino Triple Junction, California. Journal of Geophysical Research: Solid Earth, 108. doi:10.1029/2001JB000902

Visualizations include topography from https://www.ncei.noaa.gov and surface fault traces from https://www.usgs.gov/programs/earthquake-hazards/faults

This repository contains:

Full catalog in CSV format:CSV file data columns correspond to selected fields of the of NonLinLoc Hypocenter format output http://alomax.free.fr/nlloc/soft7.00/formats.html#_location_hypphs_

Selected Visualization images