Neotectonics of the Marikina Valley fault system (MVFS) and tectonic framework of structures in northern and central Luzon, Philippines

Rimando, Rolly E.; Knuepfer, Peter L.K.

doi:10.1016/j.tecto.2005.11.009

Cited by 33 publications

(26 citation statements)

References 39 publications

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“…[7] Several geologic lineaments cut across Santiago Island and the Bolinao Peninsula (Figure 1). The north to northnortheast and north-northwest trending lineaments are con-sistent with the orientation of the East Zambales and Western Boundary faults and are likely associated with faults and fractures related to the active tectonic history of the area [Rimando and Knueffer, 2006]; we postulate that these could act as conduits for fluid flow.…”

Section: Study Site and Methodsmentioning

confidence: 73%

Linking regional sources and pathways for submarine groundwater discharge at a reef by electrical resistivity tomography, ²²²Rn, and salinity measurements

Cardenas

Zamora

Siringan

et al. 2010

Geophysical Research Letters

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Submarine groundwater discharge (SGD) is an important component of the hydrologic cycle connecting terrestrial to marine environments. SGD in fringing reefs and its consequences on biogeochemistry and ecology remain mostly unexplored. The 222Rn activity and salinity of seawater indicate a substantial groundwater contribution throughout most of the 20 km2 studied tropical reef in Pangasinan, Philippines. Over 30 km of electrical resistivity profiles with a penetration depth of 12.5 m shows widespread zones within the reef that are much more resistive than porous reef rocks or sediment saturated with typical seawater. Some discrete resistive areas are located close to where seawater has 222Rn peaks and where geologic lineaments are likely located suggesting that these are preferential pathways for fresher groundwater discharging to the reef. SGD at the site could be a major ecological factor connecting the reef to the subsurface environment which in turn may lead to connections to land.

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Section: Study Site and Methodsmentioning

confidence: 73%

Linking regional sources and pathways for submarine groundwater discharge at a reef by electrical resistivity tomography, ²²²Rn, and salinity measurements

Cardenas

Zamora

Siringan

et al. 2010

Geophysical Research Letters

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“…Several articles (e.g., Beavan et al, 2001;Ohkura et al, 2001;Rangein et al, 1999;Yu et al, 1999;Hamburger et al, 1983) have discussed the active kinematics of Luzon based on GPS data. The GPS data indicate a counterclockwise rotation of Luzon with respect to the Philippine Sea plate (Rimando and Peter, 2006). And this rotation is the most obvious feature in our model.…”

Section: Results and Discussion General Distribution Of Calculated DImentioning

confidence: 61%

“…Rotation of blocks bounded by strike-slip faults has been shown to widespread in the world (Nur and Ron, 1987;Garfunkel and Ron, 1985;Ron et al, 1984). After synthesizing previous research results, Rimando and Peter (2006) concluded that the GPS data indicate a counterclockwise rotation of Luzon with respect to the Philippine Sea plate.…”

Section: Present-day Velocity Fieldmentioning

confidence: 90%

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Kinematics of convergence and deformation in Luzon Island and adjacent sea areas: 2-D finite-element simulation

et al. 2009

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The Luzon Island is a volcanic arc sandwiched by the eastward subducting South China Sea and the northwestward subducting Philippine Sea plate. Through experiments of plane-stress, elastic, and 2-dimensional finite-element modeling, we evaluated the relationship between plate kinematics and present-day deformation of Luzon Island and adjacent sea areas. The concept of coupling rate was applied to define the boundary velocities along the subduction zones. The distribution of velocity fields calculated in our models was compared with the velocity field revealed by recent geodetic (GPS) observations. The best model was obtained that accounts for the observed velocity field within the limits of acceptable mechanical parameters and reasonable boundary conditions. Sensitivity of the selection of parameters and boundary conditions were evaluated. The model is sensitive to the direction of convergence between the South China Sea and the Philippine Sea plates, and to different coupling rates in the Manila trench, Philippine trench and eastern Luzon trough. We suggest that a change of ±15° of the direction of motion of the Philippine Sea plate can induce important changes in the distribution of the computed displacement trajectories, and the movement of the Philippine Sea plate toward azimuth 330° best explains the velocity pattern observed in Luzon Island. In addition, through sensitivity analysis we conclude that the coupling rate in the Manila trench is much smaller compared with the rates in the eastern Luzon trough and the Philippine trench. This indicates that a significant part of momentum of the Philippine Sea plate motion has been absorbed by the Manila trench; whereas, a part of the momentum has been transmitted into Luzon Island through the 108 eastern Luzon trough and the Philippine trench.

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“…The mountain range of the Cordilleras is cut by the PFZ and its branches. Among the more prominent faults in the area are the Digdig, Tebbo, Pugo, Tuba, and Coastal "Thrust" Fault [6] (Figure 1). The Cordilleras, which is composed of granodioritic bodies, shallow-to deep-sea sedimentary units, and volcanics, began uplifting during the Miocene.…”

Section: Regional Geology and Tectonicsmentioning

confidence: 99%

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

Rimando

2020

Geosciences

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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.

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Neotectonics of the Marikina Valley fault system (MVFS) and tectonic framework of structures in northern and central Luzon, Philippines

Cited by 33 publications

References 39 publications

Linking regional sources and pathways for submarine groundwater discharge at a reef by electrical resistivity tomography, ²²²Rn, and salinity measurements

Linking regional sources and pathways for submarine groundwater discharge at a reef by electrical resistivity tomography, ²²²Rn, and salinity measurements

Kinematics of convergence and deformation in Luzon Island and adjacent sea areas: 2-D finite-element simulation

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

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Neotectonics of the Marikina Valley fault system (MVFS) and tectonic framework of structures in northern and central Luzon, Philippines

Cited by 33 publications

References 39 publications

Linking regional sources and pathways for submarine groundwater discharge at a reef by electrical resistivity tomography, 222Rn, and salinity measurements

Linking regional sources and pathways for submarine groundwater discharge at a reef by electrical resistivity tomography, 222Rn, and salinity measurements

Kinematics of convergence and deformation in Luzon Island and adjacent sea areas: 2-D finite-element simulation

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

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Linking regional sources and pathways for submarine groundwater discharge at a reef by electrical resistivity tomography, ²²²Rn, and salinity measurements

Linking regional sources and pathways for submarine groundwater discharge at a reef by electrical resistivity tomography, ²²²Rn, and salinity measurements