多地震叠加提取双台间面波频散信息

利用中国HIA台和哈撒克斯坦BRVK台的甚宽频地震仪记录的2011年日本MW9.0大地震及3次MW6——7强余震数据, 采用互相关法提取了双台间的瑞雷波群速度频散曲线．研究发现, 对于同一台记录的大地震和强余震激发的瑞雷波, 其主要能量的周期范围明显不同, MW9.0大地震面波主要能量周期长(70 s以上), 而强余震面波的主要能量周期相对较短（10——50 s）．单独利用大地震数据无法提取60 s以下的群速度频散, 而单独利用强余震数据无法提取100 s以上频散．将双台记录的特大地震、强余震数据进行互相关叠加, 可以提取出较为可靠的宽频带瑞雷波群速度频散曲线（10——200 s）． 

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.