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Strain Partitioning in the Philippine Fault System, Central Luzon

This research paper discusses the results of strain partitioning in the Philippine Fault System in Central Luzon. It highlights the velocity field, 2D dislocation models, and interseismic deformation observed through GPS surveys. The conclusion provides insight into the fault slip rate and the seismogenic behavior of the Manila Trench and PHF.

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Strain Partitioning in the Philippine Fault System, Central Luzon

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  1. Strain Partitioning in the Philippine Fault System, Central Luzon Shui-Beih Yu1, Ya-Ju Hsu1, Teresito Bacolcol2, Yi-Chun Tsai1 and Renato Solidum2 1. Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan 2. Philippine Institute of Volcanology and Seismology, Quezon City, Philippines

  2. Outline • Luzon GPS array • Central and northern Luzon velocity field • 2D dislocation model along the Philippine Fault system • Conclusion and future perspective

  3. Luzon GPS Array 1996-2008 (8 surveys) 1996-2000: surveyed annually 3 additional surveys: 2004/4, 2006/12, 2008/8

  4. Velocity Field w.r.t. Stable Eurasia Taiwan – Ryukyu: CGPS (2002-2008) Luzon: Survey-mode (1996-2008)

  5. Luzon GPS Array 2013 Add survey-mode sites: 2008-2009 2008-2013: 4-5 surveys CGPS stations: Nov. 2008: 6 sites Apr. 2010: 8 sites Feb./Jul. 2011: 8 sites Oct. 2011: 5 sites in Batanes/ Babuyan Islands Feb.-Aug. 2012: 3 sites Now 30 CGPS stations are in operation!

  6. MUNZ SOLA

  7. GPS Position Time Series TRLC AURA AURA–TRLC: Ve= -18.0, Vn=21.5, Vu=0.5; V= 28 mm/yr, 320°

  8. 2000-2013 Velocities w.r.t. Sunda Western Coast: 61-90 mm/yr 281°- 286° Eastern Coast: 86-95 mm/yr 296°- 298°

  9. 2000-2013 Velocities w.r.t. LUZA

  10. Interseismic Deformation (Matsu’ura et al., 1986)

  11. 2D Dislocation Model (1)

  12. 2D Dislocation Model (2)

  13. 2D Dislocation Model (3)

  14. Luzon CGPS Array 2014-2015

  15. Conclusion • We observe a gradual decreasing of station velocity from 90 mm/yr at the northwest corner of Luzon to 61 mm/yr at Subic of central Luzon. This feature also suggests a southward decrease of converging rate along the Manila Trench. • We infer the fault slip rate falls in the range of 26-36 mm/yr. The Philippine Fault is nearly fully locked in central Luzon. • The new Luzon CGPS array will give a more accurate velocity field and better understanding on the seismogenic behavior of the Manila Trench and PHF.

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