Gamay Bay is located on the northeastern coast of Samar Island, which directly faces the Pacific Ocean and is regularly impacted by large storms and typhoons, leading to coastal erosion. Knowing more about the formation of Gamay Bay’s coastal plain can provide a better understanding of what factors were involved in the changing landscape as the bay was forming, and little ground penetrating radar (GPR) research has been done along Gamay Bay. To better understand the subsurface stratigraphy, GPR sends electromagnetic pulses into the near subsurface while a receiver measures the reflecting waves. Sensors and Software® pulseEKKO GPR System with 100 MHz antennae 1m apart was used with a 25cm step size along a 425m topographically corrected transect. Data was processed using EKKO Project software. Reflections are accurate to ~6.5m, show 5 erosional truncations with ~8o dip angles roughly 3m below the surface interpreted as large storm events, and subparallel complex sigmoid-oblique deposition patterns which are interpreted as beach progradation. The GPR data results will be used in future research to confirm sites of interest and numerically date the sands to construct a timeline of when the erosional events may have occurred.
