Low-frequency and trend compensation of broadband seismograms
Tóm tắt
The present paper proposes a technique for low-frequency and trend compensation of broadband seismograms, which involves frequency-band broadening using digital filtering and background-trend compensation based on a Heaviside-type tilt signal estimated using a stochastic trend model. Applying this method to the east-west component of broadband seismograms, recorded using VSE355G3 broadband seismometers at the KSN site of F-net for the 2011 off the Pacific coast of Tohoku Earthquake (Mw 9.0), allowed a sharpened velocity waveform to be obtained and the static displacement associated with the earthquake to be determined.
Tài liệu tham khảo
Boore, D. M., Effect of baseline corrections on displacements and response spectra for several recordings of the 1999 Chi-Chi, Taiwan, Earthquake, Bull. Seismol. Soc. Am., 91(5), 1199–1211, 2001.
Hutt, C. R., J. R. Evans, and I. Yokoi, A brief test of the Tokyo Sokushin VSE-355G3 strong-motion velocity meter, Open-file Report 2008-1311, 44 pp., USGS, 2008.
Javelaud, E. H., T. Ohmachi, and S. Inoue, A quantitative approach for estimating coseismic displacements in the near field from strong-motion accelerographs, Bull. Seismol. Soc. Am., 101(3), 1182–1198, 2011.
Kalman, R. E., A new approach to linear filtering and prediction, J. Basic Eng. Trans. ASME, 82, 35–45, 1960.
Kinoshita, S., Tilt measurement using broadband velocity seismograms, Bull. Seismol. Soc. Am., 98, 1887–1897, 2008.
Kinoshita, S. and M. Takagishi, Generation and propagation of static displacement estimated using KiK-net recordings, Earth Planets Space, 63, 779–783, 2011.
Kinoshita, S., H. Ishikawa, and T. Satoh, Tilt motions recorded at two WISE sites for the 2003 Tokachi-Oki Earthquake (M 8.3), Bull. Seismol. Soc. Am., 99(2B), 1251–1260, 2009.
Kitagawa, G., Introduction to Time Series Modeling, 296 pp., Chapman and Hall/CRC, New York, 2010.
Kitagawa, G. and W. Gersch, Smoothness Priors Analysis of Time Series, 261 pp., Springer-Verlag, New York, 1996.
Lee, R. C. K., Optimal Estimation, Identification, and Control, 152 pp., Research Monograph 28, MIT Press, Cambridge, 1964.
Pillet, R. and J. Virieux, The effects of seismic rotations on inertial sensors, Geophys. J. Int., 171(3), 1314–1323, 2007.
Rauch, H. E., F. Tung, and C. T. Striebel, Maximum likelihood estimates of linear dynamic systems, AIAA J., 3, 1444–1450, 1965.
Wu, Y.-M. and C.-F., Wu, Approximate recovery of coseismic deformation from Taiwan strong-motion records, J. Seismol., 11, 159–170, 2007.