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Morphotectonic Kinematic Indicators along the Vigan-Aggao Fault: The Western Deformation Front of the Philippine Fault Zone in Northern Luzon, the Philippines

1
Philippine Institute of Volcanology and Seismology, PHIVOLCS Bldg., C.P. Garcia Avenue, U.P. Campus, Diliman, Quezon City 1101, Philippines
2
Department of Earth Sciences, University of Toronto, Toronto, ON M5S 3B1, Canada
3
Department of Chemical and Physical Sciences, University of Toronto Mississauga, Mississauga, ON L5L 1C6, Canada
*
Author to whom correspondence should be addressed.
Geosciences 2020, 10(2), 83; https://doi.org/10.3390/geosciences10020083
Received: 28 January 2020 / Revised: 18 February 2020 / Accepted: 20 February 2020 / Published: 22 February 2020
(This article belongs to the Section Natural Hazards)
The Vigan-Aggao Fault is a 140-km-long complex active fault system consisting of multiple traces in the westernmost part of the Philippine Fault Zone (PFZ) in northern Luzon, the Philippines. In this paper, its traces, segmentation, and oblique left-lateral strike-slip motion are determined from horizontal and vertical displacements measured from over a thousand piercing points pricked from displaced spurs and streams observed from Google Earth Pro satellite images. This work marks the first instance of the extensive use of Google Earth as a tool in mapping and determining the kinematics of active faults. Complete 3D image coverage of a major thoroughgoing active fault system is freely and easily accessible on the Google Earth Pro platform. It provides a great advantage to researchers collecting morphotectonic displacement data, especially where access to aerial photos covering the entire fault system is next to impossible. This tool has not been applied in the past due to apprehensions on the positional measurement accuracy (mainly of the vertical component). The new method outlined in this paper demonstrates the applicability of this tool in the detailed mapping of active fault traces through a neotectonic analysis of fault-zone features. From the sense of motion of the active faults in northern Luzon and of the major bounding faults in central Luzon, the nature of deformation in these regions can be inferred. An understanding of the kinematics is critical in appreciating the distribution and the preferred mode of accommodation of deformation by faulting in central and northern Luzon resulting from oblique convergence of the Sunda Plate and the Philippine Sea Plate. The location, extent, segmentation patterns, and sense of motion of active faults are critical in coming up with reasonable estimates of the hazards involved and identifying areas prone to these hazards. The magnitude of earthquakes is also partly dependent on the type and nature of fault movement. With a proper evaluation of these parameters, earthquake hazards and their effects in different tectonic settings worldwide can be estimated more accurately. View Full-Text
Keywords: Vigan-Aggao Fault; neotectonics; kinematics; Philippines; northern Luzon; strike-slip faulting; Philippine Fault Zone Vigan-Aggao Fault; neotectonics; kinematics; Philippines; northern Luzon; strike-slip faulting; Philippine Fault Zone
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MDPI and ACS Style

Rimando, R.E.; Rimando, J.M. Morphotectonic Kinematic Indicators along the Vigan-Aggao Fault: The Western Deformation Front of the Philippine Fault Zone in Northern Luzon, the Philippines. Geosciences 2020, 10, 83. https://doi.org/10.3390/geosciences10020083

AMA Style

Rimando RE, Rimando JM. Morphotectonic Kinematic Indicators along the Vigan-Aggao Fault: The Western Deformation Front of the Philippine Fault Zone in Northern Luzon, the Philippines. Geosciences. 2020; 10(2):83. https://doi.org/10.3390/geosciences10020083

Chicago/Turabian Style

Rimando, Rolly E.; Rimando, Jeremy M. 2020. "Morphotectonic Kinematic Indicators along the Vigan-Aggao Fault: The Western Deformation Front of the Philippine Fault Zone in Northern Luzon, the Philippines" Geosciences 10, no. 2: 83. https://doi.org/10.3390/geosciences10020083

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