Abstract
Abstract. The city of Metro Manila has been constantly battered by several hazards on an annual basis. On January 2020, the Taal Volcano erupted with multiple recorded earthquakes. Previous literatures have found that Metro Manila is experiencing a steady subsidence. Determination of land uplift or subsidence is crucial in planning and mitigating the effects of flooding in the area. The study aims to determine whether an uplift occurred in Metro Manila after the eruption or is the study area still experiencing subsidence This study uses a pair L1 SLC Sentinel 1 Images. Radar Interferometry is used to generate Interferograms and Satellite Line of Sight (LOS) deformation was determined between the 2 dates of image acquisition. It was found that the Metro Manila area generally experienced an uplift except for some areas in Caloocan which shows subsidence. The uplift magnitude gradually decreases going from the South to North with a max value of 9.6 cm.
Highlights
IntroductionThe Philippines experiences an average of 20 typhoons (Padagdag, 2018). Compounding with climate change, the magnitude of rainfall brought about by these typhoons may result in extreme flooding
Every year, the Philippines experiences an average of 20 typhoons (Padagdag, 2018)
After Unwrapping is done, Terrain Correction is performed (Serco Italia SPA, 2018). the resulting image will be overlain with the boundary of the study area to visualize the results
Summary
The Philippines experiences an average of 20 typhoons (Padagdag, 2018). Compounding with climate change, the magnitude of rainfall brought about by these typhoons may result in extreme flooding. Metro Manila is one of the key areas where these flooding events takes most of the toll. It is suggested that 3 decades Metro Manila will be submerged due to the effects of these extreme weather events (Ng, 2020). One of the main risk factors when creating flood mitigation program is the determination of accurate flood models. This can be done by generating an accurate elevation model of the study area. Subsidence and Uplift are defined as the loss and increase of surface elevation, respectively. These change in elevation can come from a variety of sources. In an article by Lagmay (2011), Metro Manila is generally experiencing a subsidence due to groundwater extraction
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