Near fault continuous GPS monitoring network at the Metro Manila, Philippines
Name of Principal Investigator：
Department of Earth Sciences, National Cheng Kung University
Understanding the spatial and temporal variations of strain accumulation and release around the fault zone is one of the key factors for earthquake potential evaluation and the use of high density continuous GPS observations is the important strategy for monitoring the processes. Our research focus on the Valley Fault in Metro Manila, Philippines. We installed 23 single-frequency and 5 dual-frequency continuous GPS stations along the Valley fault system in Metro Manila since 2016. The results show that the horizontal velocity in the fault-parallel direction increases from west to east by about 15 mm/yr showing left-lateral motion and the fault-perpendicular velocity decreases from west to east with 5 mm/yr. The extension movement of the Valley faults is not obvious and indicating the fault is mainly a strike-slip fault with left-lateral movement.
Figure 1: The GPS horizontal velocity field and profiles of the hybrid dense GPS monitoring network along the Valley fault of metro Manila.