In this study, three sets of geophones and microphones were installed at Hua-Shan Stream in Yuen-Lin County to monitor both underground and airborne sounds produced by movements of rock in the riverbed. Fast Fourier Transform and Gabor Transform were applied to transform the time-series data into the frequency and time-frequency domains. The experimental data shows several important results. Frequencies of both the airborne and underground sounds are between 10 and 150Hz. Furthermore, the higher frequency band of the underground sounds decays much faster than the airborne sounds. The spatial decay rate of the sounds in the air was also determined and compared with theoretical values. The decay rates of sounds are affected by both air humidity and sound frequency. Conc watersheds for water resources design work.