The Rayleigh-Wave Dispersion Data Analysis by Using Multiple Filter Technique
Speaker: Yeh Ren-Jie
Abstract
The multiple filter technique is fast, efficient method of analyzing multiply dispersed signals. Amplitudes and phases, as functions of period and velocity, are determined from the output of a set of narrow-band digital filters. The feature called dispersion that we can find in surface waves is a phenomenon that the velocities of waves vary with the periods, and the function of relationship between the velocity and period in graph is called dispersion curve. According the solutions of the equation, dispersion curves can be separated by modes. The left-most solution of the equation which defined n=0 is called fundamental mode, and other solutions numbered 1 to n. Here is a case of fundamental-mode Rayleigh-wave dispersion data analysis in short-period. Chung and Yeh (1997) selected the Tapu earthquake occurred on December 15, 1993 recorded by TSMIP. The data is Z-component seismogram time series for the analysis of Rayleigh-waves. Their results show good resolution of the inverted shear-wave velocity structure finally.
Reference
A. Dziewonski, S. Bloch, M. Landisman, 1969. A Technique for the Analysis of Transient Seismic Signals. Bulletin Seismology Society of America , Vol. 59, 427-444, 1969.
Chung, J.-K., Yeh, Y.-T., 1997. Shallow Crustal Structure from Short-Period Rayleigh-Wave Dispersion Data in Southwestern Taiwan . Bulletin Seismology Society of America , Vol. 87, 370382, 1997.
S. Stein, M. Wysession, 2003. An Introduction to Seismology, Earthquakes, and Earth Structure. Blackwell Publishing, 2003.