Abstract
The 2023 M7.8 and M7.5 earthquake doublet near Kahramanmaraş, Turkey, provides insight regarding how large earthquakes rupture complex faults. Here we determine the faults geometry using surface ruptures and Synthetic Aperture Radar measurements, and the rupture kinematics from the joint inversion of high-rate Global Navigation Satellite System (GNSS), strong-motion waveforms, and GNSS static displacement. The M7.8 event initiated on a splay fault and subsequently propagated along the main East Anatolian Fault with an average rupture velocity between 3.0 and 4.0 km/s. In contrast, the M7.5 event demonstrated a bilateral supershear rupture of about 5.0–6.0 km/s over an 80 km length. Despite varying strike and dip angles, the sub-faults involved in the mainshock are nearly optimally oriented relative to the local stress tensor. The second event ruptured a fault misaligned with respect to the regional stress, also hinting at the effect of local stress heterogeneity in addition to a possible free surface effect.
| Original language | English |
|---|---|
| Article number | 7004 |
| Pages (from-to) | 1-11 |
| Number of pages | 11 |
| Journal | Nature Communications |
| Volume | 15 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published (in print/issue) - 14 Aug 2024 |
Bibliographical note
Publisher Copyright:© The Author(s) 2024.
Data Access Statement
GNSS data used in this study were obtained from the Turkish Permanent GNSS Network (TUSAGA-Aktif) and are available at https://www.tusaga-aktif.gov.tr/Web/DepremVerileri.aspx. Strong motion records
were provided by AFAD (https://tdvms.afad.gov.tr/list-station/543428/
37.043/37.288, https://tdvms.afad.gov.tr/list-station/543593/37.239/
38.089). ALOS-2 data are made freely available by the Japan Aerospace Exploration Agency (JAXA) at: https://www.eorc.jaxa.jp/ALOS/
en/dataset/alos_open_and_free_e.htm. Sentinel-1 data are also freely
available and provided by the European Space Agency (ESA) under the Copernicus Program.
