Precise, NLL-SSST-coherence hypocenter catalog for the 2023 Mw 7.8 and Mw 7.6 SE Turkey earthquake sequence.

CSV catalog file and origin-time and depth plots of preliminary NLL-SSST-coherence earthquake relocations for the 2023 Mw 7.8 and Mw 7.6, Kahramanmaraş - Gaziantep, Turkey earthquake sequence (17,248 events, M≥1.5, 2023-01-01 to 2023-03-24). NLL-SSST-coherence (Lomax and Savvaidis, 2022) 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. Preliminary relocations performed with phase arrival data available from AFAD (https://deprem.afad.gov.tr/event-catalog) on 2023-03-24. Higher precision NLL-SSST-coherence relocations should be available when reviewed, merged, seismic phase arrival data is available from AFAD, KOERI (https://eqe.boun.edu.tr) and other networks. Seismic velocity model is a smoothed version of the "Final 1-D" velocity model from:<br> Acarel, D., Cambaz, M.D., Turhan, F., Mutlu, A.K. &amp; Polat, R., 2019. Seismotectonics of Malatya Fault, Eastern Turkey. Open Geosciences, 11, 1098–1111. Available at: https://doi.org/10.1515/geo-2019-0085. [For relocations of events starting from 2020-01-01 through 2023-03-04 and including the 2020 Mw 6.8 Elazığ, Turkey sequence, see v1.0 of this dataset: https://doi.org/10.5281/zenodo.7699882] 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_ Plots show:<br> Subset of NLL-SSST-coherence earthquake relocations 2023.01.01 to 2023-03-24 with ellipsoid semi-major axis (NLL EllipsoidLen3) ≤ 10km (13,653 events).<br> Symbol size is proportional to event magnitude.<br> Used AFAD stations shown by light gray inverted pyramids.<br> KOERI stations shown by dark gray inverted pyramids. Origin-time plot event colors:<br> Blue: before 2023-02-06 M 7.8 event<br> Yellow: from 2023-02-06 01h17 UTC M 7.8 event through 2023-02-06 10h24 UTC M 7.6 event<br> Orange to Red: after 2023-02-06 10h24 UTC M 7.6 event Plot data:<br> Background image from https://opentopography.org/ (approximate projection).<br> Mapped surface faults (light purple) from: Emre, Ö., Duman, T.Y., Özalp, S., Şaroğlu, F., Olgun, Ş., Elmacı, H. &amp; Çan, T., 2018. Active fault database of Turkey. <em>Bull Earthquake Eng</em>, <strong>16</strong>, 3229–3275. https://doi.org/10.1007/s10518-016-0041-2<br> Surface Rupture Lines (green) from USGS "Turkey Earthquake Emergency Response" map:<br> https://usgs.maps.arcgis.com/apps/webappviewer/index.html?id=5229bb842bd64b688d769abbefe43b46 Thanks to Sinan Ozeren, Didem Cambaz, Fatih Turhan, Onur Tan, Alberto Michelini and Pierre Henry for assistance and discussions.