P-wave tomography of subduction zones around the central Philippines and its geodynamic implications

Jianke Fan, Dapeng Zhao, Dongdong Dong, Guangxu Zhang

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

High-resolution tomographic images are obtained by inverting a large number of arrival-time data of local earthquakes and teleseismic events to depict the 3-D crustal and upper mantle structure beneath the central Philippines. Our tomographic results show that the subducted South China Sea slab beneath the southern segment of the Manila Trench steepens and tears, resulting in migration of the locus of active volcanism in the Macolod Corridor, due to the collision between the Palawan microcontinental block and the Philippine Mobile Belt. The subduction of the Philippine Sea Plate along the Philippine Trench started at 10–12°N or south of 12°N, the central part of the trench, from at least ∼10 Ma estimated from our tomographic images. Our results reveal clearly a high-velocity anomaly in and around the mantle transition zone, which is interpreted as the subducted Proto South China Sea slab that sinks deeper southeastward, being well consistent with geological results that the age of collision between the Palawan microcontinental block and the Philippine Mobile Belt becomes younger from the south to the north. This collision zone can be divided into northern and southern segments, demarcated by the salient point of the collision zone, which is probably the boundary between the South China Sea slab and the Proto South China Sea slab, and may be ascribed to the complete consumption of the two slabs.

Original languageEnglish
Pages (from-to)76-89
Number of pages14
JournalJournal of Asian Earth Sciences
Volume146
DOIs
Publication statusPublished - 2017 Sep 15

Keywords

  • Earthquakes
  • Manila Trench
  • Philippine Trench
  • Proto South China Sea slab
  • Seismic tomography
  • Subduction dynamics

ASJC Scopus subject areas

  • Geology
  • Earth-Surface Processes

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