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Non-triggering and then triggering of a repeating aftershock sequence in the Dead Sea by the 2023 Kahramanmaraş earthquake pair: Implications for the physics of remote delayed aftershocks
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  • Asaf Inbal,
  • Alon Ziv,
  • Itzhak Lior,
  • Ran Novitsky Nof,
  • Andreas Samuel Eisermann
Asaf Inbal
Department of Geophysics, Tel Aviv University

Corresponding Author:[email protected]

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Alon Ziv
Department of Geosciences, Tel-Aviv University
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Itzhak Lior
Institute of Earth Sciences, The Hebrew University, Jerusalem, Israel
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Ran Novitsky Nof
The Geological Survey of Israel
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Andreas Samuel Eisermann
Department of Geophysics, Tel Aviv University
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Abstract

Most aftershocks occur in areas experiencing large co-seismic stress changes, yet some occur long after the mainshock in remote lightly-stressed regions. The triggering mechanism of these remote delayed aftershocks is not well understood. Here, we study aftershocks occurring in the Dead Sea (DS) area following the 2023 Mw7.8 and Mw7.6 Kahramanmaraş earthquakes. Most aftershocks cluster along previously quiescent structures off the main the DS fault strand. Visual inspection disclosed three aftershocks instantaneously triggered by the Mw7.6 in the Northern DS basin, and match-filtering revealed a delayed aftershock. Waveform similarity and temporal clustering suggest the northern DS aftershocks re-rupture a stick-slip patch loaded by surrounding creep. Velocity-gradient seismograms show the Mw7.6 exerted larger transient stresses than the Mw7.8, which may explain triggering by the Mw7.6, but not by the Mw7.8. This account of instantaneously-triggered repeaters underscores the role of interactions between aseismic and seismic slip in remote triggering.
21 Jun 2023Submitted to ESS Open Archive
23 Jun 2023Published in ESS Open Archive