NLL-SSST-coherence high-precision earthquake location catalog for the M 7.0, 2025 Alaska-Yukon Hubbard Glacier earthquake sequence

Hypocenter catalog files and visualization of high-precision, NLL-SSST-coherence earthquake locations for the M 7.0, 2025 Alaska-Yukon Hubbard Glacier earthquake sequence and background seismicity (2020-01-01 to 2025-12-09). 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://earthquake.usgs.gov/earthquakes Initial seismic velocity model is the scak model used by the Alaska Earthquake Center, from:Silwal, V., & Tape, C. (2016). Seismic moment tensors and estimated uncertainties in southern Alaska. Journal of Geophysical Research: Solid Earth, 121(4), 2772–2797. https://doi.org/10.1002/2015JB012588 Visualizations include surface fault traces from https://www.usgs.gov/programs/earthquake-hazards/faults This repository contains: Selected Visualization imagesplotted epicenters are from expectation hypocenters (expect_lat, expect_lon in csv file) 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_ CSV format description:FIELD : DESCRIPTION date-time : maximum likelihood* hypocenter origin time latitude : maximum likelihood* hypocenter latitude (deg) longitude : maximum likelihood* hypocenter longitude (deg) depth : maximum likelihood* hypocenter depth (km below reference level (e.g. sea-level)) RMS : root-mean-square of phase residuals at hypocenter (sec) Nphs : number of readings used for location Gap : maximum azimuth gap between stations used for location (deg) Dist : distance of closest station to maximum likelihood* hypocenter (Non-GLOBAL: km, GLOBAL: deg) errH : horizontal error (semi-major axis of 68% confidence error ellipse) (km) errZ : depth error (68% confidence: sqrt(2.30 * covariance(zz))) (km) Mamp : amplitude (i.e. ML) magnitude Mdur : duration magnitude expect_lat : expectation hypocenter latitude (deg) expect_lon : expectation hypocenter longitude (deg) expect_z : expectation hypocenter depth (km below reference level (e.g. sea-level)) EllipsoidAz1 : azimuth of semi-minor-axis of 68% confidence ellipsoid (deg) EllipsoidDip1 : dip of semi-minor-axis of 68% confidence ellipsoid (deg) EllipsoidLen1 : length of semi-minor-axis of 68% confidence ellipsoid (km) EllipsoidAz2 : azimuth of semi-intermediate-axis of 68% confidence ellipsoid EllipsoidDip2 : dip of semi-intermediate-axis of 68% confidence ellipsoid (deg) EllipsoidLen2 : length of semi-intermediate-axis of 68% confidence ellipsoid (km) EllipsoidLen3 : length of semi-major-axis of 68% confidence ellipsoid (km) minHorUnc : semi-minor axis of 68% confidence ellipse (km) maxHorUnc : semi-major axis of 68% confidence ellipse (km) azMaxHorUnc : azimuth of major axis of 68% confidence ellipse (deg) pdfVolume : integral over octree cells of volume * cell probability (if octree search used) mech_strike : strike of double couple mechanism (deg) mech_dip : dip of double couple mechanism (deg) mech_rake : rake of double couple mechanism (deg) mech_misfit : misfit of mechanism determination mech_Nobs : number of first motion observations used in mechanism determination publicId : event id string * expectation hypocenter if LOCHYPOUT SAVE_NLLOC_EXPECTATION used