Abstract: The geophysical method was used to provide the seismic design information of a project in Hangzhou. According to the site geological conditions, a total of four (4) test borings with the in-situ single-hole wave velocity test were planned and the original waveform figures within different soil layers were obtained. The average shear wave velocity in different soil layers and the thickness of each soil layer were determined. The seismic site class and the seismic design intensity could be established based on the obtained seismic shear wave velocity. The results indicate that, the project site class belongs to I1 to II and the seismic design intensity is six degrees. The design seismic group belongs to the first group, and the characteristic period of the site category I1 is 0.25s, the site category Ⅱ is 0.35s. The investigation results also show that the single-hole wave velocity test could be directly used in the site geophysical testing, and the result is relatively accurate and convenient.

Key words: geophysical method, single hole wave velocity test, soil types, site class, seismic design intensity