Impact of communal irrigation on the 2018 Palu earthquake-triggered landslides

Watkinson, Ian M.; Hall, Robert

doi:10.1038/s41561-019-0448-x

Cited by 104 publications

(64 citation statements)

References 54 publications

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“…1). Surface water of irrigation systems and topographic slopes ≥ 1.5° have been suspected to have induced the liquefaction with landslide in eastern Palu Valley (e.g., Bradley et al 2019;Watkinson and Hall 2019). Therefore, sides of the basin where thick alluvial fan materials cover are hazard areas of large-scale liquefaction.…”

Section: The Southern Area the Palu Basinmentioning

confidence: 99%

Distribution and morphology of the surface ruptures of the 2018 Donggala–Palu earthquake, Central Sulawesi, Indonesia

Jaya

Nishikawa

Jumadil

2019

Earth Planets Space

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A large Mw 7.5 earthquake occurred at 18.03 on 28 September 2018 in the Donggala-Palu area of Central Sulawesi, Indonesia, which triggered a tsunami, liquefaction, and landslides. A 160-km rupture zone was formed on the surface along the NS to NNW-SSE trending Palu-Koro fault (PKF) system through three regencies: Donggala, Palu, and Sigi. Obvious surface ruptures associated with the earthquake were not observed in the epicentral area. Surface ruptures with a small displacement of both sinistral and westerly downward slip components appear south of the epicentral area in the Donggala area. The event induced widespread subsidence of the Donggala coastal area on the west side of the rupture zone. Passing across the Palu bay, the rupture cuts through the urban area of Palu city and extends across alluvial fans along the western side of the Palu basin showing large displacements with a predominant sinistral slip up to 4.2 m and subordinate easterly downward slip components. Approximately 5 m of anomalously high vertical displacement with 3 m of horizontal displacement occurs in an extensional bend in the southern area of the Palu basin. In the Sigi valley, the rupture zone follows the previously known PKF trace showing predominant sinistral and subordinate easterly downward slip, of which displacement is 0.9 m sinistral and 0.5 m easterly downward at the site 60 km south of Palu city and gradually smaller toward the south. These distributions of rupture zones and displacements suggest that rupture of the 2018 earthquake unilaterally propagated southwards and resulted in the movement of the eastern side of the fault towards the NNW.

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Section: The Southern Area the Palu Basinmentioning

confidence: 99%

Distribution and morphology of the surface ruptures of the 2018 Donggala–Palu earthquake, Central Sulawesi, Indonesia

Jaya

Nishikawa

Jumadil

2019

Earth Planets Space

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“…The two researchers also verified the magnitude of the Palu earthquake with a magnitude of 7.5. Three other researchers noted about liquefaction carried out by Watkinson and Hall (2019), Cummins (2019) and Bradley et al (2019). They argue that liquefaction at several sites in Central Sulawesi is a liquefaction phenomenon that is very different from what has happened in other places because it occurs in a relatively large area.…”

Section: Introductionmentioning

confidence: 99%

Impact of Landslides Induced by the 2018 Palu Earthquake on Flash Flood in Bangga River Basin, Sulawesi, Indonesia

Tunas¹,

Tanga²,

Oktavia³

2020

J. Ecol. Eng.

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High magnitude flash flood has occurred several times in some areas in Central Sulawesi Province after the 2018 Palu Earthquake, one of them is in the Bangga River, Sigi Regency, Indonesia. It has caused massive impacts such as damaging agricultural and plantation areas and submerging public facilities and infrastructure and even causing fatalities. The flood carries a variety of materials, especially high concentration sediments which are thought to originate from eroded soils due to landslides induced by a 7.5 magnitude earthquake. These materials are eroded and transported by the flow at the upstream watershed due to heavy rainfall. This study intends to investigate the potential of landslides, factors that trigger floods and increased flooding after the earthquake. This research was conducted by investigating the landslides potency based on field surveys and interpretation of the latest satellite imagery, analyzing the characteristics of rainfall as a trigger for flooding, and predicting the flood potency as the primary impact of these two factors. Rainfall-flood transformation was simulated with the HEC-HMS Model, one of the freeware semi-distributed models commonly used in hydrological analysis. The model input is the configuration of river networks generated from the National DEM (DEMNAS), hourly rainfall during floods and other watershed parameters such as land cover, soil types and river slope. The similar simulation was also carried out on the condition of the watershed before the earthquake. Based on the results of the analysis, It can be inferred that flash floods in the Bangga River are mainly caused by heavy rainfall with long duration and landslide areas in the upper watershed triggered by the 2018 Palu Earthquake with an area of approximately 10.8 km 2 . The greatest depth of rainfall as a trigger for flooding is 30.4 mm with a duration of 8 hours. The results of the study also showed that landslides in the upper watershed could increase the peak flood by 33.33% from 118.56 m 3 /s to 158.08 m 3 /s for conditions before and after the earthquake.

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“…The earthquake ruptured the Palu-Koro fault system, a north-south left-lateral fault zone with a rapid average tectonic rate of about 4 cm/yr (Socquet et al, 2006) and previously identified to have a high seismic hazard (Pusat Studi Gempa Nasional -National Center for Earthquake Studies, 2017;Watkinson and Hall, 2017). It triggered a tsunami with run-ups reaching 6-8 m high on the Palu Bay coast (Carvajal et al, 2019;Ulrich et al, 2019), as well as widespread liquefaction and surface spreading inland (Valkaniotis et al, 2018;Watkinson and Hall, 2019). To show how key geophysical information was rapidly disseminated and discussed, we compiled the most informative tweets that were posted about the event's characteristics and processes.…”

Section: -Studied Events and Methodsologymentioning

confidence: 98%

Rapid collaborative knowledge building via Twitter after significant geohazard events

Lacassin¹,

Dévès²,

Hicks

et al. 2020

Preprint

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<p>Twitter is an established social media platform valued by scholars as an open way to disseminate scientific information and to publicly discuss research results. Scientific discussions on Twitter are widely viewed by the media who can then pass on information to the public. Here, we take the example of two 2018 earthquake-related events which were widely commented on Twitter by geoscientists: the Palu Mw7.5 earthquake and tsunami in the Indonesian island of Sulawesi and the long-duration (more than one year) seismo-volcanic crisis Mayotte island in the Comoros archipelago between Africa and Madagascar. We build our analysis on a content and contextual analysis of selected Twitter threads about the geophysical characteristics of these events. Most authors of this paper have participated to these Twitter threads and related discussions, and regularly explain geohazard events via this social media. From the two selected examples, we show that Twitter promotes very rapid building of knowledge &#8211; in the minutes to hours and days following an event &#8211; via an efficient exchange of information and active discussion between the scientists themselves and with the public. Combining these results with our own experience of communicating geohazard science via Twitter, we discuss the advantages and potential pitfalls of this relatively novel way to make scientific information accessible to scholarly peers and to lay people. We argue that scientific discussion on Twitter breaks down the traditional &#8220;ivory towers&#8221; of academia. It participates to the growing trends towards open science, making science accessible to any non-academics or citizen scientists who can follow and participate in the discussion. This may help people to understand how science is developed, and, in the case of natural/environmental hazards, to better understand their risks.</p>

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Impact of communal irrigation on the 2018 Palu earthquake-triggered landslides

Cited by 104 publications

References 54 publications

Distribution and morphology of the surface ruptures of the 2018 Donggala–Palu earthquake, Central Sulawesi, Indonesia

Distribution and morphology of the surface ruptures of the 2018 Donggala–Palu earthquake, Central Sulawesi, Indonesia

Impact of Landslides Induced by the 2018 Palu Earthquake on Flash Flood in Bangga River Basin, Sulawesi, Indonesia

Rapid collaborative knowledge building via Twitter after significant geohazard events

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