Back to Search
Start Over
The December 22, 2018 Anak Krakatau, Indonesia, Landslide and Tsunami: Preliminary Modeling Results
- Source :
- Pure and Applied Geophysics, Pure and Applied Geophysics, 2020, 177, pp.571-590. ⟨10.1007/s00024-019-02394-y⟩, Pure and Applied Geophysics, Springer Verlag, 2020, 177, pp.571-590. ⟨10.1007/s00024-019-02394-y⟩
- Publication Year :
- 2020
- Publisher :
- HAL CCSD, 2020.
-
Abstract
- International audience; On the evening of December 22, 2018, the coasts of the Sunda Strait, Indonesia, were hit by a tsunami generated by the collapse of a part of the Anak Krakatau volcano. Hundreds of people were killed, thousands were injured and displaced. This paper presents a preliminary modeling of the volcano flank collapse and the tsunami generated based on the results of a 2D depth-averaged coupled model involving a granular rheology and a Coulomb friction for the slide description and dispersive effects for the water flow part. With a reconstructed total volume (subaerial and submarine) of the landslide of 150 million m 3 inferred from pre and post-collapse satellite and aerial images , the comparison of the simulated water waves with the observations (tide gauges located all around the strait, photographs and field surveys) is satisfactory. Due to the lack of information for the submarine part of the landslide, 2 Alexandre Paris et al. the reconstructed submarine slope is assumed to be approximately constant. A significant time delay on the results and particularly in the Bandar Lampung Bay could be attributed to imprecisions of bathymetric data. The sensitivity to the basal friction and to dispersive effects is analyzed through numerical tests. Results show that the influence of the basal friction angle on the simulated wave heights decreases with distance and that a value of 2°gives consistent results with the observations. The dispersive effects are assessed by comparing water waves simulated by a shallow water model and a Boussinesq model. Simulations with frequency dispersion produce longer wave periods and smaller wave amplitudes in the Sunda Strait and particularly in deep waters.
- Subjects :
- [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere
geography
geography.geographical_feature_category
Water flow
Submarine
Landslide
010502 geochemistry & geophysics
01 natural sciences
Waves and shallow water
Geophysics
Volcano
13. Climate action
Geochemistry and Petrology
Subaerial
[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology
Bathymetry
Tide gauge
14. Life underwater
Geology
Seismology
0105 earth and related environmental sciences
Subjects
Details
- Language :
- English
- ISSN :
- 00334553 and 14209136
- Database :
- OpenAIRE
- Journal :
- Pure and Applied Geophysics, Pure and Applied Geophysics, 2020, 177, pp.571-590. ⟨10.1007/s00024-019-02394-y⟩, Pure and Applied Geophysics, Springer Verlag, 2020, 177, pp.571-590. ⟨10.1007/s00024-019-02394-y⟩
- Accession number :
- edsair.doi.dedup.....48a1cae8c682b4f288572271fa8c48f0