DOI: 10.5281/zenodo.7699881
title: Precise, NLL-SSST-coherence hypocenter catalog for the 2023 Mw 7.8 and Mw 7.6 SE Turkey earthquake sequence.

description: <strong>CSV catalog file and visualizations of NLL-SSST-coherence earthquake relocations for the 2023 Mw 7.8 and Mw 7.6, Kahramanmaraş - Gaziantep, Turkey earthquake sequence (28,264 events, M≥1.5, 2023-01-01 to 2023-06-24).</strong> NLL-SSST-coherence (Lomax and Savvaidis, 2022; Lomax and Henry, 2023) 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 merged phase arrival data available from AFAD (https://deprem.afad.gov.tr/event-catalog) and KOERI (http://www.koeri.boun.edu.tr/sismo/2/bultenler) downloaded on 2023-06-23. All events in the AFAD catalog with M≥1.5 are used for relocation; for each AFAD event, arrival data for the corresponding events from KOERI is merged when available (epicenter within 10km, origin time within 10 sec). 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. & 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]<br> This repository archive file contains: <strong>Full catalog in CSV format</strong>: X_Turkey_20230624A_Acarel2019smooth_NLL-SSST-coherence_M1.5.csv<br> 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_ <strong>Key NLL-SSST-coherence configuration files</strong>: NLL-SSST-coherence_config/ <strong>Visualization images:</strong> <strong>Full catalog</strong>: A_Turkey_20230624A_Acarel2019smooth_NLL-SSST-coherence_M1.5.png<br> <strong>Events with (68% location ellipsoid) err ≤ 8km, origin-time color scale</strong>: B_Turkey_20230624A_Acarel2019smooth_NLL-SSST-coherence_M1.5_se8km_OTIME.png<br> <strong>Events with err ≤ 8km</strong>: B_Turkey_20230624A_Acarel2019smooth_NLL-SSST-coherence_M1.5_se8km.png<br> <strong>Events with err ≤ 8km, depth ≤ 10km</strong>: C_Turkey_20230624A_Acarel2019smooth_NLL-SSST-coherence_M1.5_se8km_z-10.png<br> <strong>Events with err ≤ 8km, depth ≥ 10km</strong>: C_Turkey_20230624A_Acarel2019smooth_NLL-SSST-coherence_M1.5_se8km_z10-.png Symbol size is proportional to event magnitude.<br> 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<br> Mapped surface faults (light purple) from: Emre, Ö., Duman, T.Y., Özalp, S., Şaroğlu, F., Olgun, Ş., Elmacı, H. & 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: Reitman, N.G., Briggs, R.W., Barnhart, W.D., Thompson Jobe, J.A., DuRoss, C.B., Hatem, A.E., Gold, R.D., Akçiz, S., Koehler, R.D., Mejstrik, J.D., Collett, C., 2023, Fault rupture mapping of the 6 February 2023 Kahramanmaraş, Türkiye, earthquake sequence from satellite data: U.S. Geological Survey data release, https://doi.org/10.5066/P985I7U2. Thanks to Sinan Ozeren, Didem Cambaz, Fatih Turhan, Dogan Kalafat, Selda Altuncu Poyraz, Kıvanç Kekovalı, Onur Tan, Alberto Michelini and Pierre Henry for assistance and discussions.
description: DATA AND RESOURCES: Earthquake relocations performed using seismic phase arrival picks and station metadata available from: - Republic of Turkey, Ministry of Interior, Disaster and Emergency Management Presidency, Earthquake Department (AFAD) https://deprem.afad.gov.tr/event-catalog. - BOUN KOERI Regional Earthquake-Tsunami Monitoring Center (KOERI) http://www.koeri.boun.edu.tr/sismo/2/bultenler NLL-SSST-coherence earthquake relocations performed with NonLinLoc (http://www.alomax.net/nlloc, https://github.com/alomax/NonLinLoc) configured for NLL-SSST-coherence (https://doi.org/10.5281/zenodo.4756709, Lomax and Savvaidis, 2022). SeismicityViewer (http:// www.alomax.net/software) was used for 3D seismicity analysis and plotting. Waveforms for the following channels and networks were obtained through the specified FDSN (https://www.fdsn.org/) data centers: KO_DARE_--_HHZ,KO_SARI_--_HHZ,KO_SVRC_--_HHZ,KO_KMRS_--_HHZ,KO_URFA_--_HHZ,KO_KHMN_--_HNZ,KO_GAZ_--_HHZ,KO_CEYT_--_HHZ,KO_KRTS_--_HNZ,KO_TAHT_--_HHZ : https://doi.org/10.7914/SN/KO https://eida.koeri.boun.edu.tr ; TU_ANDN_--_HHZ : https://doi.org/10.7914/SN/TU http://www.orfeus-eu.org ; GE_ARPR_--_SHZ,GE_ARPR_--_BHZ : https://doi.org/10.14470/TR560404 https://geofon.gfz-potsdam.de ; KO_GAZ_--_HHZ,KO_BNN_--_HHZ : https://doi.org/10.7914/SN/KO http://service.iris.edu ; The facilities of IRIS Data Services, and specifically the IRIS Data Management Center, were used for access to waveforms and related metadata used in this study. IRIS Data Services are funded through the Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation under Cooperative Agreement EAR-1261681.
description: {"references": ["Lomax, A. and Savvaidis, A. (2022) 'High-Precision Earthquake Location Using Source-Specific Station Terms and Inter-Event Waveform Similarity', Journal of Geophysical Research: Solid Earth, 127(1), p. e2021JB023190. Available at: https://doi.org/10.1029/2021JB023190.", "Lomax, A. (2020) 'The 2020 Mw 6.5 Monte Cristo Range, Nevada earthquake: relocated seismicity shows rupture of a complete shear-crack system'. Available at: https://doi.org/10.31223/X5X015."]}