AI Article Synopsis
- The 2023 M7.8 and M7.5 earthquakes near Kahramanmaraş, Turkey, revealed complex fault rupture patterns, utilizing surface ruptures and advanced radar measurements to understand fault geometry and rupture movement.
- The M7.8 quake started on a splay fault and moved along the East Anatolian Fault at a speed of 3.0 to 4.0 km/s, while the M7.5 event had a faster bilateral supershear rupture of 5.0-6.0 km/s across an 80 km distance.
- The study indicates that the mainshock's sub-faults were well-aligned with local stress, while the second event's fault orientation suggested influences of local stress variations and
Article 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.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11325041 | PMC |
| http://dx.doi.org/10.1038/s41467-024-51446-y | DOI Listing |
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