Project Details
Description
The Manila subduction zone connects both Taiwan and the Philippines, its earthquake potential and the possible resulted tsunamis closely relate to the human life of both countries. The Philippine Fault, on the other hand, is one of the major strike-slip faults in the world, its creeping-locked fault behavior has important implications on fault properties and the resulted earthquake potential to the other strike-slip faults in the world and the Longitudinal Valley Fault in eastern Taiwan. We plan to use the broadband seismometers and geodetic techniques to monitor the earthquake activities and assess the earthquake potential along the Manila subduction zone and the Philippine Fault. This project includes five subproposals. 1. Seismic monitoring and hazard assessment for Luzon and Taiwan. Using waveform stacking technique, we could precisely relocate the several earthquakes in the same time. 2. Deployments of broadband linear array in central Luzon and ZLand array in Mindoro. The rupture area of the 2022 Mw 7.1 Luzon Island earthquake reaches 3125 km2. The maximum slip is up to 154 cm and the average rake is 39°. The reverse slip is mainly shown at the depth range of 10-20 km, while the left-lateral slip dominates the depth shallower than 10 km. 3. Crustal deformation in Luzon and tsunami hazard assessment in Luzon and Taiwan. We used the collected GNSS data to calculate the coseismic displacements of the 2022 Mw 7.1 Luzon Island earthquake. The maximum displacement is 53 mm toward west, 212 mm toward north and 224 m upward. 4. Creeping segment of the Philippine fault and its seismic hazard assessment. We estimated the InSAR velocity field in the Leyte Island. The descending LOS velocities show that the relative LOS velocity across the Philippine fault is around 20-30 mm/yr. The velocity inversion method has been improved and been tested in SW Taiwan. 5. GPS observations and earthquake potential of central Philippine Fault. The interseismic velocities in central Philippine fault were evaluated using the GPS data from 1997 to 2013 and from 2015 to 2019. The slip deficit rate of 13.2 mm/yr was derived using 2D block model. If the 2003 Mw 6.2 Masbate earthquake is the maximum magnitude on the Masbate segment of Philippine fault, the recurrence interval is around 94 years.
Status | Finished |
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Effective start/end date | 1/11/22 → 31/10/23 |
Keywords
- Manila trench
- Philippine fault
- seismic monitoring
- crustal deformation
- tsunami early warning
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