TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 64 (No. 4), pp. e5-e8, 2012


Low-frequency and trend compensation of broadband seismograms

Shigeo Kinoshita

Yokohama City University, Seto 22-2, Kanazawa-ku, Yokohama 236-0027, Japan

(Received July 11, 2011; Revised February 5, 2012; Accepted February 15, 2012; Online published April 16, 2012)

Abstract: 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.
Key words: Broadband seismograms, strong motion, band broadening, digital compensation filter, background trend.

Corresponding author E-mail: kkk001@yokohama-cu.ac.jp

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