SEGJ Technical Conference

Field test of the passive surface wave method at an inside the test circuit road: study of the directional dependency of the microtremor and the estimated velocity structure

Abstract A field test has been performed for the passive surface wave method to investigate the directional dependency and stationarity of the microtremor by using many receivers deployed on a circumference. The microtremor at some frequencies come from a certain direction, but the estimated S-wave velocity structures by SPAC at different time of day show small variation. Applying vibration by running cars on the test circuit road did not change the frequency range for the analysis as well as the estimated velocity structure. That is due to the constant microtremor at the test site and too many receivers were deployed for 1 D survey. Analyzing the same data with a few receivers is the next step of the study.