The effect of meteoric phreatic diagenesis and spring sapping on the formation of submarine collapse structures in the Biak Basin, Eastern Indonesia

Gold, David P.

doi:10.31223/osf.io/78nuv

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…The carbonate platform grew in the Early to Middle Miocene and is found not only on Biak Island but also in the Bintuni and Salawati basins. This carbonate platform is part of the Limestone Guinea Group that was deposited at the same time in the western part of New Guinea according to Gold [16]. The collapsed structure is thought to be an impact of collision activity that occurred in the Paleogene.…”

Section: Discussionmentioning

confidence: 99%

Stratigraphic Model of East Biak Based on Magnetotelluric Data

Alviyanda

Junursyah

Sumintadireja

2020

J. Math. Fund. Sci.

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Biak Island is thought to have originated from the Australian Continental passive margin in the Mesozoic. This passive margin underwent tectonic collision to form the bedrock of Biak Island during the Paleogene. East Biak is covered by limestone, which is an obstacle to knowing the deeper stratigraphy. This study's aim was to identify the subsurface geology of the East Biak area based on rock resistivity values. Magnetotelluric (MT) surveying is a passive geophysical method that is able to interpret subsurface geology based on rock resistivity values at depths of up to 5 to 10 km. The MT measurements in East Biak used 25 measurement points. Cross-sectional variations in rock resistivity values generated from the MT measurements were used to identify rock types in the East Biak subsurface. Five rock units were identified. The East Biak stratigraphy model is dominated by carbonates, comprising two sequences, i.e. an Early Neogene sequence with a thickness of 1,000 to 3,000 m and a Late Neogene to Quaternary sequence with a thickness of 180 to 2,450 m. The unconformity between these two sequences is due to tectonic activity, which separated Supiori and Biak Island.

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Section: Discussionmentioning

confidence: 99%

Stratigraphic Model of East Biak Based on Magnetotelluric Data

Alviyanda

Junursyah

Sumintadireja

2020

J. Math. Fund. Sci.

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“…Southwest of Biak Island, there is the Biak Fault Zone. This is a series of parallel strike-slip faults that run along the southwest coast of the island (Gold 2018). In the west and south of Biak Island, there are the Manokwari Trench and the Yapen Fault.…”

Section: Introduction 11 Tectonic Setting Surrounding Biak Islandmentioning

confidence: 99%

Solving the Puzzle of the 1996 Biak, Indonesia Tsunami

Pandadaran,

Yanagisawa,

Shibazaki

et al. 2023

Preprint

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On February 17, 1996, an earthquake occurred northeast of Biak Island, Indonesia, and caused a tsunami. Interestingly, the southwest side of Biak Island, which was not facing the epicenter, had a higher tsunami runup than the facing side. In previous studies, it was assumed that the earthquake triggered submarine landslides. However, as no one has addressed this phenomenon, this remains an unsolved hypothesis. The tsunami arrival times obtained from local people’s testimonies were used to perform backward tsunami raytracing. Considering the raytracing results and multibeam topography, we found four submarine landslide candidates: three submarine landslides and one submarine landslide were located to the southwest and south of Biak Island, respectively. The results showed that the submarine landslide located at 135.624°E and 1.009°S with a length of 950 m, a width of 5000 m, and a thickness of about 75 m seems to explain the observed runup and arrival time. In previous studies, the fault parameters were determined without considering a submarine landslide event. As a result, the models could not explain the observed runup in the southwest coastal area of Biak Island. To tackle this problem, we propose an approach that combines a submarine landslide model and a modification of a previously proposed fault model. Our model explains the observed runup heights well; we obtained a geometric mean of 1.00 and a geometric standard deviation of 1.44.

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The effect of meteoric phreatic diagenesis and spring sapping on the formation of submarine collapse structures in the Biak Basin, Eastern Indonesia

Abstract: The islands of Biak and Supiori, situated

Cited by 2 publications

References 22 publications

Stratigraphic Model of East Biak Based on Magnetotelluric Data

Stratigraphic Model of East Biak Based on Magnetotelluric Data

Solving the Puzzle of the 1996 Biak, Indonesia Tsunami

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