Seismotectonics of Mindoro, Philippines

Chen, Po Fei; Olavere, Erlinton Antonio; Wang, Chen-Wei; Bautista, Bartolome C.; Solidum, Renato U.; Liang, Wen‐Tzong

doi:10.1016/j.tecto.2014.11.023

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…The northern part of the SCS subducts at a relatively shallower dip of 45 °due to the subduction of a buoyant plateau. Further south, the angle of subduction becomes steeper at ~75 ° (Fan et al, 2016) This is inferred to have been caused by the collision between the Philippine Mobile Belt and Palawan micro-Continental Block (PCB) at the central Philippines (Chen et al, 2015). The Philippine Sea Plate was also reported to be subducting beneath the Ryukyu Arc at a dip of ~75 °as identified from the Wadatti-Benioff zone and seismic tomography (e.g., Bijwaard et al, 1998;Widiyantoro et al, 1999;Wang et al, 2008;Wei et al, 2015).…”

Section: New Arc Magmatic Addition Rates For the Western Pacific Isla...mentioning

confidence: 99%

Enhanced arc magmatic productivity of the Western Pacific island arcs deduced from gravity-derived arc crustal growth rates

Parcutela

Austria²,

Dimalanta³

et al. 2023

Front. Earth Sci.

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Island arcs are postulated as the juvenile components that contribute to the growth of continental crust. Growth rates of arc crusts were previously computed using crustal thicknesses derived from seismic data. Consequently, crustal growth rates of oceanic island arcs are also constrained by the limited seismic data availability. This work presents the first comparison of gravity-derived magmatic growth rates of Western Pacific oceanic island arcs. We used the statistical correlation between Bouguer anomalies and seismic-derived crustal thicknesses to generate an empirical formula. The new empirical formula was utilized to estimate the crustal thicknesses of oceanic island arcs using Bouguer anomalies from the EGM2008 global gravity model. The resulting crustal thicknesses were employed to compute the magmatic growth rates of western Pacific island arcs and the Philippine island arc system. The latest magmatic growth rate estimates show that the magmatic productivity of Western Pacific island arcs, which are directly associated with Pacific Plate subduction, is significantly higher (28–60 km3/km/m.y). The growth rate of the Pacific island arcs is higher compared to the magmatic growth rate computed for the other oceanic island arcs (12–25 km3/km/m.y), which are derived from the subduction of other oceanic lithospheres (i.e., the Philippine Sea Plate; Caribbean Sea Plate; and Eurasia-South China Sea slabs). This is attributed to the variation in the ages of the subducting plates. The Pacific Plate, being older, is associated with higher degrees of serpentinization and sediment cover, which introduce more volatiles inducing more robust partial melting of the mantle wedge.

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Section: New Arc Magmatic Addition Rates For the Western Pacific Isla...mentioning

confidence: 99%

Enhanced arc magmatic productivity of the Western Pacific island arcs deduced from gravity-derived arc crustal growth rates

Parcutela

Austria²,

Dimalanta³

et al. 2023

Front. Earth Sci.

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“…In addition to the discussed local structures, the Manila Trench is located more than 100 km to the west and southwest of Verde Island Passage. Most of the earthquakes in the region are thrust-type and come from the subducting slab which extends from the trench to around 80 km beneath Verde Island Passage (Chen et al, 2015). On the other hand, the shallow earthquakes in Verde Island Passage are of the left-lateral strike-slip type which is related to the Verde Passage Fault.…”

Section: Seismicitymentioning

confidence: 99%

“…FIGURE 13 | Ongoing extension in northern Central Philippines because of differential northwestward block motion. Basins are delineated in yellow.The direction of extension for the basins are from the structural interpretation in Macolod Corridor(Pubellier et al, 2000) and T axes from GCMT solutions in other areas(Chen et al, 2015;Yoshida et al, 2016;Chen et al, 2020). Black arrows show GPS motions fromYu et al (2013) while green arrows are fromRangin et al (1999), all fixed to Sundaland Block in mm/yr.…”

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confidence: 99%

Seafloor Structures and Static Stress Changes Associated With Two Recent Earthquakes in Offshore Southern Batangas, Philippines

et al. 2022

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The 1994 Mw 7.1 Mindoro Earthquake and the 2017 Mw 5.9 Batangas Earthquake Sequence both occurred in offshore southern Batangas and devastated southern Luzon and Mindoro. These earthquakes exhibited NW-striking right-lateral slip in an area presumably defined by a WNW-striking left-lateral fault, therefore implying the existence of previously unmapped offshore faults. High resolution multibeam bathymetry grid and subbottom profiles revealed a conjugate strike-slip fault system under an approximately EW-directed extension. NW-striking right-lateral faults (F1 Faults: Central Mindoro Fault, Aglubang River Fault, and Batangas Bay Fault System) bound the western part of the study area. On the other hand, a series of almost parallel NE-trending left-lateral and normal faults (F2 Faults: Macolod Corridor, North Verde Fault System, Central Verde Fault System, South Verde Fault, and Northeast Mindoro Fault System) approach the F1 faults from the northeast. The distribution of the 1994 and 2017 earthquakes suggests that the possible rupture areas for these events are the Aglubang River Fault and the southwest Batangas Bay Fault System, respectively. These two traces appear to be connected and a restraining bend is suggested to have acted as a rupture barrier between the two events. Coulomb stress transfer modeling showed that the 1994 earthquake promoted the failure of the 2017 earthquake. Furthermore, results from the stress transfer models showed stress increase on the F1 faults (Batangas Bay Fault System and Central Mindoro Fault) and the northern F2 faults (North Verde Fault System and Central Verde Fault System). The newly recognized faults redefine the knowledge of the neotectonic structure of the area but are still consistent with the ongoing east-west extension in southern Luzon and the overall extension in northern Central Philippines. These faults pose seismic hazards, and more studies are needed to determine their seismogenic potential.

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“…In addition, the proximity of the 2017 Batangas earthquake and MC would be exposed under the same regional stress patterns, which can be learnt from the focal mechanisms of the main shock. To the southwest, on the other hand, the 2017 Batangas earthquake sits almost on top of a steeply dipping slab from the subduction of the South China Sea lithosphere along the Manila Trench (Chen et al 2015;Bina et al 2020) (Figs. 1a and c).…”

Section: Introductionmentioning

confidence: 99%

Relocation of the April 2017 Batangas, Philippines, earthquake sequence, with tectonic implications

Chen¹,

Su²,

Olavere³

et al. 2020

Terr. Atmos. Ocean. Sci.

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The 2017 M w 5.9 Batangas earthquake occurred on a location abutting the Macolod Corridor (MC) to the NE and above the steeply dipping slab of subducted South China Sea lithosphere to the SW. While the spatial distribution of the 2017 Batangas earthquake sequence provides a constraint on the scope of MC's geothermal activity, the focal mechanisms are associated with the states of stress in MC. Here, we relocated the 2017 Batangas sequence using data from two seismic network which cover the region of the NW Mindoro and Southern Luzon. Upon employing the HypoDD algorithm, we retrieve a compact distribution within the Batangas Bay, which in turn suggests that the Balayan Bay to the north remains aseismic and is within the scope of geothermally impact area by MC. In addition, the 2017 Batangas earthquake and the 1994 Mindoro Earthquake share similar focal mechanisms that exhibit an E-W extension in the region of SW Luzon, which differs from a few leftlateral moderate earthquakes to the east at 121.5°E on the Sibuyan Verde Passage Fault. Together with the results of 3D numerical modeling on coeval subduction of oceanic and continental lithospheres and P-wave tomography in the region from previous studies, we incline to explain the regional E-W extension in SW Luzon as induced by the toroidal asthenospheric flow and the mechanisms of MC formation as originated by the overriding-plate stretching. Both are incipiently driven by the collision of the Palawan Continental Block into the Philippine Mobile Belt and the subsequent detachment of the South China Sea slab beneath central Mindoro.

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Seismotectonics of Mindoro, Philippines

Cited by 10 publications

References 26 publications

Enhanced arc magmatic productivity of the Western Pacific island arcs deduced from gravity-derived arc crustal growth rates

Enhanced arc magmatic productivity of the Western Pacific island arcs deduced from gravity-derived arc crustal growth rates

Seafloor Structures and Static Stress Changes Associated With Two Recent Earthquakes in Offshore Southern Batangas, Philippines

Relocation of the April 2017 Batangas, Philippines, earthquake sequence, with tectonic implications

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