Abstract：We select three components of continuous waveform data observed by six seismic stations from August 14 to December 31, 2017 in MS7.0 Jiuzhaigou earthquake emergency mobile network, and then calculate the noise PSDs and corresponding PDFs. Compared with the new earth noise models(NHNM and NLNM), we analyze the variation characteristics of the noise level of emergency mobile stations. The results show that there are no obvious geometrical variations of noise in the high-frequency band of seismic station, the noise sources affecting the horizontal and vertical components noise levels of the stations are different, or the same noise source has different intensity in the horizontal and vertical components. Affected by culture noise and natural noise, the average noise level is significantly higher than the average of NHNM and NLNM, and some stations are close to or above the NHNM. Both culture and natural noise are broadband. Culture noise is closely related to the actions of human beings at or near the surface of the earth, shows very strong diurnal variations, and can generate a single frequency of fixed noise in a fixed period of time. The running water in small streams can produce continuous high-frequency natural noise. The noise level differs in different frequency bands, and the diurnal variation is not obvious.
