Articles | Volume 26, issue 10
https://doi.org/10.5194/nhess-26-5035-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-26-5035-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
14 Oct 2026
Research article |
| 14 Oct 2026
| 14 Oct 2026
Seismic and tsunami hazard potential of the Negros–Sulu megathrust, Philippines
Lyndon P. Nawanao Jr.
CORRESPONDING AUTHOR
National Institute of Geological Sciences, University of the Philippines Diliman, 1101, Quezon City, Philippines
Noelynna T. Ramos
CORRESPONDING AUTHOR
National Institute of Geological Sciences, University of the Philippines Diliman, 1101, Quezon City, Philippines
Toshitaka Baba
Graduate School of Science and Technology, Tokushima University, Tokushima, Japan
Naotaka Chikasada
National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan
Kenji Satake
Earthquake Research Institute, The University of Tokyo, Tokyo, Japan
Department of Earth Sciences, National Central University, Taoyuan, Taiwan
Related authors
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Yuchen Wang, Mohammad Heidarzadeh, Kenji Satake, and Gui Hu
Nat. Hazards Earth Syst. Sci., 22, 1073–1082, https://doi.org/10.5194/nhess-22-1073-2022, https://doi.org/10.5194/nhess-22-1073-2022, 2022
Short summary
Short summary
Tsunami waveforms contain the features of its source, propagation path, and local topography. On 4 March 2021, two tsunamis were generated by earthquakes in the Kermadec Islands, New Zealand, within 2 h. This rare case gives us a valuable opportunity to study the characteristics of two tsunamis. We analyzed the records of two tsunamis at tide gauges with spectral analysis tools. It is found that two tsunamis superpose during the few hours after the arrival of the second tsunami.
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Short summary
The scarcity of information on the Negros–Sulu megathrust impedes reliable seismic and tsunami hazard assessments. Here, we estimated 18 megathrust rupture scenarios based on available data and modeled tsunami propagations to identify highly exposed coastal areas surrounding the Sulu Sea. The generated rupture parameters, maximum wave heights, flow velocity, and minimum arrival times provide significant bases for regional-scale mitigation strategies and exploring tsunami deposits.
The scarcity of information on the Negros–Sulu megathrust impedes reliable seismic and tsunami...
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