Liquefaction in Palu: the cause of massive mudflows

The 7.5 Mw tectonic earthquake that hit Palu City on 28 September 2018 was followed by tsunami and liquefaction, triggered massive mudflows in Balaroa, Petobo, and Jono Oge areas. This study focuses on the generating factors of liquefaction such as the condition of soil lithology, depth of water tab...

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Main Authors: Jalil, A., Fathani, T.F., Satyarno, I., Wilopo, W.
格式: Article PeerReviewed
出版: 2021
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https://www.scopus.com/inward/record.uri?eid=2-s2.0-85120910315&doi=10.1186%2fs40677-021-00194-y&partnerID=40&md5=c0bdef6eb919814f027a576ad36a67ad
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spelling id-ugm-repo.2793602023-11-06T05:42:48Z https://repository.ugm.ac.id/279360/ Liquefaction in Palu: the cause of massive mudflows Jalil, A. Fathani, T.F. Satyarno, I. Wilopo, W. Geomorphology and Regolith and Landscape Evolution Physical Geography and Environmental Geoscience Geology The 7.5 Mw tectonic earthquake that hit Palu City on 28 September 2018 was followed by tsunami and liquefaction, triggered massive mudflows in Balaroa, Petobo, and Jono Oge areas. This study focuses on the generating factors of liquefaction such as the condition of soil lithology, depth of water table, the distance to the focal mechanism, and the thickness of soft sediment. Microtremor data, including the Horizontal Vertical Spectral Ratio (HVSR), geological condition, and borehole data, were examined to conduct the liquefaction analysis. The analysis results based on the microtremor data showed that the distribution of ground shear strain values in Palu City ranged from 0.75 � 10�4 to 2.56 � 10�4. The distribution of the locations of the liquefaction was correlated to the distribution of ground shear strain values. High ground shear strain values and a shallow groundwater level were discovered in Palu City valley, which indicates that liquefaction in Palu City will undoubtedly occur. The semi-empirical method confirmed that Balaroa, Petobo, and Jono Oge had undergone large-scale liquefaction at a maximum depth of 16 m below the ground level. The average peak of water runoff that generated the mudflow was estimated to be at 11.31 cm3/s. Since the soil has loose soil grain with high water content, the soil will turn into a massive amount of mud during the liquefaction. © 2021, The Author(s). 2021 Article PeerReviewed Jalil, A. and Fathani, T.F. and Satyarno, I. and Wilopo, W. (2021) Liquefaction in Palu: the cause of massive mudflows. Geoenvironmental Disasters, 8 (1). https://www.scopus.com/inward/record.uri?eid=2-s2.0-85120910315&doi=10.1186%2fs40677-021-00194-y&partnerID=40&md5=c0bdef6eb919814f027a576ad36a67ad
institution Universitas Gadjah Mada
building UGM Library
continent Asia
country Indonesia
Indonesia
content_provider UGM Library
collection Repository Civitas UGM
topic Geomorphology and Regolith and Landscape Evolution
Physical Geography and Environmental Geoscience
Geology
spellingShingle Geomorphology and Regolith and Landscape Evolution
Physical Geography and Environmental Geoscience
Geology
Jalil, A.
Fathani, T.F.
Satyarno, I.
Wilopo, W.
Liquefaction in Palu: the cause of massive mudflows
description The 7.5 Mw tectonic earthquake that hit Palu City on 28 September 2018 was followed by tsunami and liquefaction, triggered massive mudflows in Balaroa, Petobo, and Jono Oge areas. This study focuses on the generating factors of liquefaction such as the condition of soil lithology, depth of water table, the distance to the focal mechanism, and the thickness of soft sediment. Microtremor data, including the Horizontal Vertical Spectral Ratio (HVSR), geological condition, and borehole data, were examined to conduct the liquefaction analysis. The analysis results based on the microtremor data showed that the distribution of ground shear strain values in Palu City ranged from 0.75 � 10�4 to 2.56 � 10�4. The distribution of the locations of the liquefaction was correlated to the distribution of ground shear strain values. High ground shear strain values and a shallow groundwater level were discovered in Palu City valley, which indicates that liquefaction in Palu City will undoubtedly occur. The semi-empirical method confirmed that Balaroa, Petobo, and Jono Oge had undergone large-scale liquefaction at a maximum depth of 16 m below the ground level. The average peak of water runoff that generated the mudflow was estimated to be at 11.31 cm3/s. Since the soil has loose soil grain with high water content, the soil will turn into a massive amount of mud during the liquefaction. © 2021, The Author(s).
format Article
PeerReviewed
author Jalil, A.
Fathani, T.F.
Satyarno, I.
Wilopo, W.
author_facet Jalil, A.
Fathani, T.F.
Satyarno, I.
Wilopo, W.
author_sort Jalil, A.
title Liquefaction in Palu: the cause of massive mudflows
title_short Liquefaction in Palu: the cause of massive mudflows
title_full Liquefaction in Palu: the cause of massive mudflows
title_fullStr Liquefaction in Palu: the cause of massive mudflows
title_full_unstemmed Liquefaction in Palu: the cause of massive mudflows
title_sort liquefaction in palu: the cause of massive mudflows
publishDate 2021
url https://repository.ugm.ac.id/279360/
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85120910315&doi=10.1186%2fs40677-021-00194-y&partnerID=40&md5=c0bdef6eb919814f027a576ad36a67ad
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