The 2018 Sulawesi tsunami in Palu city as a result of several landslides and coseismic tsunamis

Aránguiz, Rafael; Esteban, Miguel; Takagi, Hiroshi; Mikami, Takahito; Takabatake, Tomoyuki; Gómez, Matías; González, J. A.; Shibayama, Tomoya; Okuwaki, Ryo; Yagi, Y.; Shimizu, Keiko; Achiari, Hendra; Stolle, Jacob; Robertson, Ian; Ohira, Koichiro; Nakamura, Ryota; Nishida, Yuta; Krautwald, Clemens; Goseberg, Nils; Nistor, Ioan

doi:10.1080/21664250.2020.1780719

Cited by 32 publications

(13 citation statements)

References 46 publications

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“…In the A area, the underlying fracture zone was indicated by the seismic-reflection survey (Danny et al 2020) and the change in the coastline was confirmed by satellite imagery (Sassa and Takagawa 2018). Aránguiz et al 2020) also assumed the mass thickness of C3 and C4 to be 30 m in their tsunami simulation. Takagi et al (2019) conducted a bathymetric survey in the area of B and indicated that a maximum subsidence was 40 m which was determined based on a comparison of the bathymetric map before and after the earthquake.…”

Section: Overview Of a Possible Coastal Landslide Modelmentioning

confidence: 96%

“…In previous numerical simulations, the video footage derived by Carvajal et al (2019) was used to estimate possible landslide sources (Sepúlveda et al 2020;Nakata et al 2020;Aránguiz et al 2020). Carvajal et al (2019) used their tsunami video analysis to obtain the tsunami time histories, specifically employing videos of the coastal area recorded by local people and closedcircuit cameras.…”

Section: Estimation Of Possible Landslide Sourcementioning

confidence: 99%

“…Takagi et al (2019) conducted a bathymetric survey in the area of B and indicated that a maximum subsidence was 40 m which was determined based on a comparison of the bathymetric map before and after the earthquake. We also determined the thickness of C3, C4 and C5 as 30 m, 30 m and 40 m, respectively, based on previous studies (Danny et al 2020;Aránguiz et al 2020;Takagi et al 2019) by using the performance parameters K and κ, as shown in Supplementary Material 2. According to source E, we verified the parameters and compared the simulation results with the video footage at Talise.…”

Section: Overview Of a Possible Coastal Landslide Modelmentioning

confidence: 99%

“…Nakata et al (2020) proposed large submarine landslide sources in the eastern part of the bay throught observations and video footages. Aránguiz et al 2020) proposed some coastal landslide sources in the western and southern coastal area based on their bathymetric survey, and they suggested that the combination of these landslides and coseismal deformation induced a tsunami that reache Palu city within a few minutes after the earthquake. However, they did not compared the simulation results with the observed run-up heights throughout the bay in detail.…”

Section: Introductionmentioning

confidence: 99%

“…Previous investigations of landslide simulations showed some possible coastal and submarine landslide sources that could explain the video footages and observed run-up heights (Sepúlveda et al 2020;Nakata et al 2020). Moreover, it was indicated that first and second tsunami wave, which reached the city a few minutes after the earthquake were generated by coastal landslide sources (Takagi et al 2019;Aránguiz et al 2020). However, the detailed bathymetric survey has not conducted in some areas after the 2018 earthquake in the seabed of southern area.…”

Section: Introductionmentioning

confidence: 99%

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Consideration of submarine landslide induced by 2018 Sulawesi earthquake and tsunami within Palu Bay

Nagai

Muhari²,

Pakoksung

et al. 2021

Coastal Engineering Journal

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On September 28 2018, an Mw 7.5 strike-slip earthquake occurred to the north of Palu Bay on the Sulawesi Island, Indonesia. This triggered a destructive tsunami within the bay, which reached Palu city. Simulation have been conducted to investigate the landslide source. However, the tsunami should be investigated considering a physical model in the area where detailed bathymetric survey had not been conducted. In this study, we investigated the impact of coastal landslides on the southern part of the bay using a two-layer model. Owing to the increasing collapse volume, the southern west coastal landslide could approximately explain the observations in Palu city. However, the calculated mass volume of the source largely overestimated the bathymetric survey data. Hence, we considered the possibility of submarine landslide in the southern part of the bay and the simulation results could approximately explain the maximum tsunami heights in the southern part of the bay. These results suggest that more detailed multibeam data will be required to investigate the possible submarine landslide in the southern area which could induce a destructive tsunami reaching Palu city within a few minutes after the collapse.

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Section: Overview Of a Possible Coastal Landslide Modelmentioning

confidence: 96%

Section: Estimation Of Possible Landslide Sourcementioning

confidence: 99%

Section: Overview Of a Possible Coastal Landslide Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Consideration of submarine landslide induced by 2018 Sulawesi earthquake and tsunami within Palu Bay

Nagai

Muhari²,

Pakoksung

et al. 2021

Coastal Engineering Journal

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Filling in the Gaps of the Tsunamigenic Sources in 2018 Palu Bay Tsunami

Higuera

Sepúlveda

Liu

2021

Springer Tracts in Civil Engineering

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Tsunami Genesis of Strike-Slip Earthquakes Revealed in the 2018 Indonesian Palu Event

Song

Chen

Prasetya³

2023

Pure Appl. Geophys.

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The devastating tsunami after the 2018 Indonesian Sulawesi-Palu strike-slip earthquake was a surprise because strike-slip faulting is a known phenomenon of primarily lateral movement of land, while tsunamis are believed to be caused by vertical movement of seafloor. Here we show that the horizontal displacement of seafloor slopes, instead of the vertical movement or land-sliding, was the primary cause of the tsunami. We reconstructed the earthquake from seismographs and satellite data, and used the earthquake-induced momentum to replicate the tsunami. We found that the strike-slip faulting could generate multiple tsunami sources by pushing waters laterally. Sources from the deeper slopes caused the deadly long-wave tsunami hit the Palu city, while sources outside the Palu bay resulted in the "early arrival" tsunami at Mamuju, explained observations that could not be reconciled previously. Our findings suggest a new approach of using lateral movement of faulting to detect tsunamis for early warning.

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The 2018 Sulawesi tsunami in Palu city as a result of several landslides and coseismic tsunamis

Cited by 32 publications

References 46 publications

Consideration of submarine landslide induced by 2018 Sulawesi earthquake and tsunami within Palu Bay

Consideration of submarine landslide induced by 2018 Sulawesi earthquake and tsunami within Palu Bay

Filling in the Gaps of the Tsunamigenic Sources in 2018 Palu Bay Tsunami

Tsunami Genesis of Strike-Slip Earthquakes Revealed in the 2018 Indonesian Palu Event

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