دورية أكاديمية
Coupled, Physics-Based Modeling Reveals Earthquake Displacements are Critical to the 2018 Palu, Sulawesi Tsunami
| العنوان: | Coupled, Physics-Based Modeling Reveals Earthquake Displacements are Critical to the 2018 Palu, Sulawesi Tsunami |
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| المؤلفون: | Ulrich, Thomas, Vater, S., Madden, E. H., Behrens, J., van Dinther, Y., van Zelst, I., Fielding, E. J., Liang, C., Gabriel, A.-A. |
| المساهمون: | Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, Munich, Germany, Institute of Mathematics, Freie Universität Berlin, Berlin, Germany, Observatório Sismológico, Instituto de Geociências, Universidade de Brasília, Brasilia, Brazil, Numerical Methods in Geosciences, Department of Mathematics, Universität Hamburg, Hamburg, Germany, Department of Earth Sciences, Utrecht University, Utrecht, The Netherlands, Seismology and Wave Physics, Department of Earth Sciences, Institute of Geophysics, ETH Zürich, Zürich, Switzerland, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA, Seismological Laboratory, California Institute of Technology, Pasadena, CA, USA |
| بيانات النشر: | Springer Nature |
| سنة النشر: | 2019 |
| المجموعة: | King Abdullah University of Science and Technology: KAUST Repository |
| مصطلحات موضوعية: | Sulawesi, tsunami, earthquake dynamics, coupled model, physics-based modeling, strike slip |
| الوصف: | The September 2018, Mw 7.5 Sulawesi earthquake occurring on the Palu-Koro strike-slip fault system was followed by an unexpected localized tsunami. We show that direct earthquake-induced uplift and subsidence could have sourced the observed tsunami within Palu Bay. To this end, we use a physics-based, coupled earthquake–tsunami modeling framework tightly constrained by observations. The model combines rupture dynamics, seismic wave propagation, tsunami propagation and inundation. The earthquake scenario, featuring sustained supershear rupture propagation, matches key observed earthquake characteristics, including the moment magnitude, rupture duration, fault plane solution, teleseismic waveforms and inferred horizontal ground displacements. The remote stress regime reflecting regional transtension applied in the model produces a combination of up to 6 m left-lateral slip and up to 2 m normal slip on the straight fault segment dipping 65 ∘ East beneath Palu Bay. The time-dependent, 3D seafloor displacements are translated into bathymetry perturbations with a mean vertical offset of 1.5 m across the submarine fault segment. This sources a tsunami with wave amplitudes and periods that match those measured at the Pantoloan wave gauge and inundation that reproduces observations from field surveys. We conclude that a source related to earthquake displacements is probable and that landsliding may not have been the primary source of the tsunami. These results have important implications for submarine strike-slip fault systems worldwide. Physics-based modeling offers rapid response specifically in tectonic settings that are currently underrepresented in operational tsunami hazard assessment. ; We thank Taufiqurrahman for helping us accessing data on Indonesian websites, and for putting us in contact with Indonesian researchers. We thank Dr. T. Yudistira for providing their crustal velocity model of Sulawesi and Dr. Andreas Fichtner for providing us part of the ‘Collaborative Seismic Earth Model’. We thank Dr. Marcello de ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | unknown |
| تدمد: | 0033-4553 1420-9136 |
| العلاقة: | http://link.springer.com/10.1007/s00024-019-02290-5Test; Ulrich, T., Vater, S., Madden, E. H., Behrens, J., van Dinther, Y., van Zelst, I., … Gabriel, A.-A. (2019). Coupled, Physics-Based Modeling Reveals Earthquake Displacements are Critical to the 2018 Palu, Sulawesi Tsunami. Pure and Applied Geophysics, 176(10), 4069–4109. doi:10.1007/s00024-019-02290-5; 2-s2.0-85071317511; 10; Pure and Applied Geophysics; http://hdl.handle.net/10754/668593Test; 176 |
| DOI: | 10.1007/s00024-019-02290-5 |
| DOI: | 10.31223/osf.io/3bwqa |
| الإتاحة: | https://doi.org/10.1007/s00024-019-02290-5Test https://doi.org/10.31223/osf.io/3bwqaTest http://hdl.handle.net/10754/668593Test |
| حقوق: | Archived with thanks to Pure and Applied Geophysics ; https://creativecommons.org/licenses/by/4.0Test |
| رقم الانضمام: | edsbas.5AE0CCD4 |
| قاعدة البيانات: | BASE |
| تدمد: | 00334553 14209136 |
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| DOI: | 10.1007/s00024-019-02290-5 |