Long-period directivity pulses of strong ground motion during the 2023 Mw7.8 Kahramanmaraş earthquake

Autor: František Čejka, Jiří Zahradník, Fatih Turhan, Efthimios Sokos, František Gallovič
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Communications Earth & Environment, Vol 4, Iss 1, Pp 1-14 (2023)
Druh dokumentu: article
ISSN: 2662-4435
41678737
DOI: 10.1038/s43247-023-01076-x
Popis: Abstract Damages due to large earthquakes are influenced by broadband source effects that remain enigmatic. Here we develop a broadband (0–10 Hz) source model of the disastrous 2023 Mw7.8 Kahramanmaraş, Türkiye, earthquake by modeling recordings of 100 stations. The model combines coherent and incoherent rupture propagation at low and high frequencies, respectively. We adopt a planar 300 km long kinked fault geometry from geology and pre-constrain the slip model from seismic and geodetic data. We demonstrate that the southwestward rupture propagation was delayed by ~15 s and that the observed strong waveform pulses can be explained by the directivity effect due to a specific combination of the coherent and incoherent components. We show that even a rough estimate of major rupture parameters makes the ground motion simulations of such large events possible, and may thus improve the efficiency of rapid, physics-based, shaking estimation for emergency response and seismic hazard assessment.
Databáze: Directory of Open Access Journals
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