Measurement of inter-station surface wave dispersion using multi-earthquake data stacking

Using data of the 2011 Japan MW9.0 great earthquake and three strong aftershocks recorded by the very broadband seismometers of HIA station of China and BRVK station of Kazakhstan, the Rayleigh wave group velocity dispersion curves between the two stations are acquired by correlation method. The result shows that main energy of Rayleigh wave varies with earthquake magnitude, though the data are recorded by the same station. Main Rayleigh wave of the MW9.0 great earthquake has longer period (70 s), and the main Rayleigh wave of the strong aftershocks has shorter period (10mdash;50 s). The dispersion curve has a limit in band when using the data of the great earthquake or the aftershocks separately. The dispersion less than 60 s could not be obtained from the data of the great earthquake alone, and dispersion longer than 100 s could not be acquired from the aftershock data alone. However, broadband group velocity dispersion curve of Rayleigh wave (10mdash;200 s) is acquired using multi-earthquake correlation data stacking.