1Institute of Geophysics, China Earthquake Administration (CEA), Beijing, China
In order to obtain the differences in characteristics of the noise field between the seismic arrays along the coast and those on the mainland, we used the data from Fuqing array and LZDM array in this research. Cross-correlation method was used in this research indication that the noise cross-correlation between site pairs along the coast present a linear relation with the increasing of the separation between two sites in frequency bands 0.1-1 Hz and 0.5-1.5 Hz, while the noise cross-correlation in the mainland show different type. The noise cross-correlation values for the array located along the coast are very high, and dropped to 0.5 in 2000 m、1200m、750m、500m、and 200m for the frequency bands of 0.1-1、0.5-1.5、0.8-2.5、1-2、and 2-4 respectively, while the noise cross-correlation values for the array in the mainland are very low, and dropped to 0.5 in 200m for the frequency bands of 0.5-1.5, which show us the array along the coast was severely affected by the low frequency sea waves. We also found obvious minus cross-correlation values in Fuqing array, and the LZDM array showed blurred minus cross-correlation values.