So S.Boonchaisuk S.Mahidol University2023-09-242023-09-242023-01-015th Asia Pacific Meeting on Near Surface Geoscience and Engineering, NSGE 2023 (2023)https://repository.li.mahidol.ac.th/handle/20.500.14594/90182A study of property of soil layer in Davao city, the Philippines by using the Multi-channel Analysis of Surface Wave (MASW) and Seismic refraction techniques. The aims of the study are to generate a shear wave and primary wave velocity model, and obtain Vs30 Contour map. Both 2D Vs and Vp model can be divide into 3 layers base on boreholes data. The top layer be related to clay layer and sand clay and/or sand silt layer. The second layer corresponds to gravels with clay layer. The bottom layer corresponds to volcanic breccia. The Vs30 contour map from MASW (WaveEq), estimate Vs30 (Wang & Wang, 2015), seismic refraction, and lithologic logs were obtained. According to the NEHRP standard, all Vs30 contour map can be classified into Class C as the very dense soil or soft rock.Earth and Planetary SciencesConference PaperSCOPUS10.3997/2214-4609.2023780282-s2.0-85171322145