The Structure and Evolution of the Sorong Fault Zone, Indonesia using Multibeam and Seismic Datasets. / Melia, Samuel.

2020. 251 p.

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@phdthesis{1641a6f1695d4431871a47d8f6d0eaa3,
title = "The Structure and Evolution of the Sorong Fault Zone, Indonesia using Multibeam and Seismic Datasets",
abstract = "The Sorong Fault Zone (SFZ) is a left-lateral strike-slip fault zone located in eastern Indonesia, extending westwards from the Bird{\textquoteright}s Head Peninsula of West Papua towards Sulawesi. Highresolution multibeam bathymetry maps of the seafloor, onshore SRTM imagery, and a grid of 2D seismic lines were used in this study to review and interpret the structure and tectonics of the SFZ.The multibeam data provides the first opportunity to map in detail and identify strands of the SFZ offshore in the largely submarine area between New Guinea and Sulawesi, and then link them toonshore structures. A regional reconstruction of motions of fragments along the fault zone from 20 to 0 Ma between Borneo and New Guinea has been produced using kinematic analysis of thestructures visible in the dataset, together with geological observations in the fault zone. The fault zone trends E-W through the north of the Bird{\textquoteright}s Head, with sinistral deformation takenup on a number of sub-parallel strands such as the Sorong and Koor faults. Offshore of the Bird{\textquoteright}s Head to the northwest, some strands terminate in a series of thrusts forming the Waigeo Basin foldand thrust belt. The SFZ diverts to a WNW-ESE trending zone of faulting on its most prominent strand – the Salawati-Obi strand – west of the Bird{\textquoteright}s Head. The Molucca-Sorong strand divergesfrom the Salawati-Obi strand near the island of Kofiau and trends NW-SE, running between the islands of Obi and Halmahera, passing through Bacan. The Salawati-Obi strand diverges again at theSula Islands into the North and South Sula Strands before terminating in the Sula Thrust Zone to the north of Mangole and terminating in the northernmost of a series of extensional faults in theBuru Basin to the south. The clockwise rotation of the Philippine Sea plate has controlled the formation of the Ayu Trough north of the Bird{\textquoteright}s Head peninsula. A possible spreading centre in this region, as well as left-lateralstrike-slip motion recorded along the New Guinea Trench and the SFZ, may have contributed to the westward translation of Halmahera, the island of Obi, and the generation of the different strands ofthe SFZ. The interaction of the fragments generated by the creation of this zone of faulting has implications for the formation of the Banda Arc and Sulawesi. This reconstruction will help to furtherunravel the complex tectonic history of SE Asia, in particular the convoluted four-way intersection between the Philippine Sea, Australian, Caroline, and Eurasian plates.",
author = "Samuel Melia",
year = "2020",
language = "English",
school = "Royal Holloway, University of London",

}

RIS

TY - THES

T1 - The Structure and Evolution of the Sorong Fault Zone, Indonesia using Multibeam and Seismic Datasets

AU - Melia, Samuel

PY - 2020

Y1 - 2020

N2 - The Sorong Fault Zone (SFZ) is a left-lateral strike-slip fault zone located in eastern Indonesia, extending westwards from the Bird’s Head Peninsula of West Papua towards Sulawesi. Highresolution multibeam bathymetry maps of the seafloor, onshore SRTM imagery, and a grid of 2D seismic lines were used in this study to review and interpret the structure and tectonics of the SFZ.The multibeam data provides the first opportunity to map in detail and identify strands of the SFZ offshore in the largely submarine area between New Guinea and Sulawesi, and then link them toonshore structures. A regional reconstruction of motions of fragments along the fault zone from 20 to 0 Ma between Borneo and New Guinea has been produced using kinematic analysis of thestructures visible in the dataset, together with geological observations in the fault zone. The fault zone trends E-W through the north of the Bird’s Head, with sinistral deformation takenup on a number of sub-parallel strands such as the Sorong and Koor faults. Offshore of the Bird’s Head to the northwest, some strands terminate in a series of thrusts forming the Waigeo Basin foldand thrust belt. The SFZ diverts to a WNW-ESE trending zone of faulting on its most prominent strand – the Salawati-Obi strand – west of the Bird’s Head. The Molucca-Sorong strand divergesfrom the Salawati-Obi strand near the island of Kofiau and trends NW-SE, running between the islands of Obi and Halmahera, passing through Bacan. The Salawati-Obi strand diverges again at theSula Islands into the North and South Sula Strands before terminating in the Sula Thrust Zone to the north of Mangole and terminating in the northernmost of a series of extensional faults in theBuru Basin to the south. The clockwise rotation of the Philippine Sea plate has controlled the formation of the Ayu Trough north of the Bird’s Head peninsula. A possible spreading centre in this region, as well as left-lateralstrike-slip motion recorded along the New Guinea Trench and the SFZ, may have contributed to the westward translation of Halmahera, the island of Obi, and the generation of the different strands ofthe SFZ. The interaction of the fragments generated by the creation of this zone of faulting has implications for the formation of the Banda Arc and Sulawesi. This reconstruction will help to furtherunravel the complex tectonic history of SE Asia, in particular the convoluted four-way intersection between the Philippine Sea, Australian, Caroline, and Eurasian plates.

AB - The Sorong Fault Zone (SFZ) is a left-lateral strike-slip fault zone located in eastern Indonesia, extending westwards from the Bird’s Head Peninsula of West Papua towards Sulawesi. Highresolution multibeam bathymetry maps of the seafloor, onshore SRTM imagery, and a grid of 2D seismic lines were used in this study to review and interpret the structure and tectonics of the SFZ.The multibeam data provides the first opportunity to map in detail and identify strands of the SFZ offshore in the largely submarine area between New Guinea and Sulawesi, and then link them toonshore structures. A regional reconstruction of motions of fragments along the fault zone from 20 to 0 Ma between Borneo and New Guinea has been produced using kinematic analysis of thestructures visible in the dataset, together with geological observations in the fault zone. The fault zone trends E-W through the north of the Bird’s Head, with sinistral deformation takenup on a number of sub-parallel strands such as the Sorong and Koor faults. Offshore of the Bird’s Head to the northwest, some strands terminate in a series of thrusts forming the Waigeo Basin foldand thrust belt. The SFZ diverts to a WNW-ESE trending zone of faulting on its most prominent strand – the Salawati-Obi strand – west of the Bird’s Head. The Molucca-Sorong strand divergesfrom the Salawati-Obi strand near the island of Kofiau and trends NW-SE, running between the islands of Obi and Halmahera, passing through Bacan. The Salawati-Obi strand diverges again at theSula Islands into the North and South Sula Strands before terminating in the Sula Thrust Zone to the north of Mangole and terminating in the northernmost of a series of extensional faults in theBuru Basin to the south. The clockwise rotation of the Philippine Sea plate has controlled the formation of the Ayu Trough north of the Bird’s Head peninsula. A possible spreading centre in this region, as well as left-lateralstrike-slip motion recorded along the New Guinea Trench and the SFZ, may have contributed to the westward translation of Halmahera, the island of Obi, and the generation of the different strands ofthe SFZ. The interaction of the fragments generated by the creation of this zone of faulting has implications for the formation of the Banda Arc and Sulawesi. This reconstruction will help to furtherunravel the complex tectonic history of SE Asia, in particular the convoluted four-way intersection between the Philippine Sea, Australian, Caroline, and Eurasian plates.

M3 - Doctoral Thesis

ER -