NDLI: Possible northward extension of the Philippine Fault Zone offshore Luzon Island (Philippines)

Content Provider	Springer Nature Link
Author	Armada, Leo Hsu, Shu Kun Ku, Chia Yen Doo, Wen Bin Wu, Wen Nan Dimalanta, Carla Yumul, Gracia
Copyright Year	2013
Abstract	The Philippine Fault Zone, a system of left-lateral strike-slip faults traversing the length of the Philippine Islands, is associated with the oblique convergence between the Philippine Sea Plate (PSP) and the Eurasian Plate (EP). Although it is a major deformational structure within the diffuse PSP–EP convergent boundary, some of its segments, particularly its marine extensions, are not well studied. To investigate the crustal deformation in the marine prolongation of the Philippine Fault Zone offshore Luzon Island, multi-channel seismic (MCS) data, gravity data and centroid moment tensor solutions were used in this study. Focal mechanism solutions from the Global CMT catalog were inverted to determine the average principal stress directions and consequently understand the prevailing stress regime in the study area. The stress inversion results indicate that the direction of maximum compression (σ1) is 321°N, which coincides with the PSP–EP convergence direction. From the MCS profiles, the study area was subdivided into deformation zone and a relatively stable zone. Thrust faulting, folding and general uplift are observed in the deformation zone. This zone is further subdivided into the active and inactive segments. In the active segment, uplift is occurring in the submarine ridge. This deformation pattern can be related to the ongoing uplift in some regions bisected by the PFZ. The inactive segment, characterized by intense folding of the sequences and faulting of the basement and overlying sequences, is suggested as the precursor of the Philippine Fault Zone. Deformation appears to be recently shifted to the east as delineated by an uplifted N-NW trending submarine ridge offshore NW Luzon Island.
Starting Page	369
Ending Page	377
Page Count	9
File Format	PDF
ISSN	00253235
Journal	Marine Geophysical Researches
Volume Number	33
Issue Number	4
e-ISSN	15730581
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-02-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Philippine Fault Zone Forearc basin Strike-slip fault Oceanography Geophysics/Geodesy Earth Sciences Offshore Engineering
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics Oceanography

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