Understanding of subsurface conditions controlling flow liquefaction occurrence during the 2018 Palu earthquake based on resistivity profiles

Tohari, Adrin; Wardhana, Dadan Dani; Hanif, Muhammad; Koizumi, Keigo

doi:10.1051/e3sconf/202133103002

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…Thus, the sub-surface topographical factor is attributable to the flow liquefaction occurrences in this area. Such a sub-surface factor is also observed in Balaroa, and Petobo [14] as well as in Lolu areas [4].…”

Section: Variation Of P-wave Velocitymentioning

confidence: 90%

Study of the sub-surface geological condition of the Sibalaya flow liquefaction using seismic refraction method

Pradnya Andika,

Tohari,

Dani Wardhana

2023

E3S Web Conf.

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Understanding the occurrence of flow liquefaction requires knowledge of the sub-surface condition controlling its occurrence. This paper presents the results of seismic refraction surveys conducted to evaluate the sub-surface geological condition in the Sibalaya flow liquefaction area. From the interpretation of the seismic refraction model, an inclined boundary presents between the near-surface sediment layers. Further examinations of the SRT images demonstrate the existence of localized basinal structures in the rock layer with the highest P-wave velocity. The basinal structure may be associated with a hidden normal fault system of horst-graben structures. Thus, this study indicates that such a complex sub-surface geological structure also contributed to the Sibalaya flow liquefaction occurrence.

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Section: Variation Of P-wave Velocitymentioning

confidence: 90%

Study of the sub-surface geological condition of the Sibalaya flow liquefaction using seismic refraction method

Pradnya Andika,

Tohari,

Dani Wardhana

2023

E3S Web Conf.

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“…Detail geological map and cross-section of Palu-Koro region [1] Liquefaction events in these two areas were indeed triggered by earthquakes and were closely related to the presence of the active Palu-Koro fault, however not all areas crossed by the Palu-Koro fault experienced the same incident. There may be local geological factors below the surface in the liquefaction area [2]. Therefore, it is necessary to study the possibility that there is a local geological structure below the surface that controls the occurrence of liquefaction.…”

Section: Introductionmentioning

confidence: 99%

Identification of Subsurface Structure Causing Liquefaction in Palu City Based on Gravity Anomaly

Dani Wardhana,

Muslim,

Zakaria

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Liquefaction in Balaroa and Petobo, Palu City occurred following the September 28 2023 earthquake which was triggered by movement of the Palu-Koro fault. It is necessary to study the existence of local geological factors which may be the cause of liquefaction in these areas. One of the contributing factors could be the existence of small structures as a follow-up to the main structure of the Palu-Koro fault. Using gravity methods at both regional scales for the Palu area and detailed scales in the Balaroa and Petobo areas to identify the presence of subsurface structures. In June 2023, gravity measurements were carried out after the Palu-Donggala earthquake in the Palu City and its surroundings. The measurement results of the gravity anomaly map in the Palu City are in the range of gravity anomaly between -4 – 66 mGals. The Balaroa region is in the gravity anomaly between 19.5 – 34.5 mGals, while Petobo is in the range -2 – 10 mGals. The gravity anomaly map shows the appearance of a structure which is characterized by the contrast of the anomalies which form a lineament which is believed to be a structure. The results of the analysis of gravity anomalies confirm the existence of small structures trending west-east and north-south in the Balaroa and Petobo liquefaction areas which may be one of the causes of liquefaction.

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“…Several researchers have tried to link the existence of irrigation canals with the phenomenon of liquefaction flow in the Petobo, Lolu, Jono Oge, and Sibalaya areas [1,2,4]. Using the electrical-resistivity tomography method, several studies attempted to identify shallow aquifers [6,7], and sub-surface topography that controlled the liquefaction phenomenon [8]. Based on inversion HVSR, [9] concluded that the flow liquefaction phenomenon in the Balaroa area was caused by the presence of sub-surface structures such as a subsurface ridge that blocked the groundwater flow causing the surface soil layer to saturate during the earthquake shaking.…”

Section: Introductionmentioning

confidence: 99%

Understanding of flow liquefaction in Lolu Village based on seismic refraction tomography method

Andika

Tohari²,

Yudistira

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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A big earthquake may induce flow liquefaction phenomena in lowland areas made up of sedimentary deposits. To understand the factors controlling such a hazard, it is necessary to have knowledge of the sub-surface geological conditions of the liquified area. This paper presents the results of a series of seismic refraction measurements in Lolu Village where flow liquefaction occurred during the 2018 Palu-Donggala earthquake. The results of seismic refraction tomography indicate the presence of horst-graben structures, probably associated with the localized pull-apart basin. The results of this study suggest that the sub-surface geological structure is also a governing factor for the occurrence of flow liquefaction phenomena in an area with a complex fault system.

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Understanding of subsurface conditions controlling flow liquefaction occurrence during the 2018 Palu earthquake based on resistivity profiles

Cited by 6 publications

References 10 publications

Study of the sub-surface geological condition of the Sibalaya flow liquefaction using seismic refraction method

Study of the sub-surface geological condition of the Sibalaya flow liquefaction using seismic refraction method

Identification of Subsurface Structure Causing Liquefaction in Palu City Based on Gravity Anomaly

Understanding of flow liquefaction in Lolu Village based on seismic refraction tomography method

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