HR: 10:30h
AN: S52A-01 [Abstracts]
TI: Generalized average of signals (GAS) - a new method for denoising and phase detection
AU: * Malek, J
EM: malek@irsm.cas.cz
AF: Institute of Rock Structure and Mechanics AS CR, V Holesovickach 41, Praha, 18209,
Czech Republic
AU: Kolinsky, P
EM: kolinsky@irsm.cas.cz
AF: Institute of Rock Structure and Mechanics AS CR, V Holesovickach 41, Praha, 18209,
Czech Republic
AU: Strunc, J
EM: strunc@irsm.cas.cz
AF: Institute of Rock Structure and Mechanics AS CR, V Holesovickach 41, Praha, 18209,
Czech Republic
AU: Valenta, J
EM: valenta@irsm.cas.cz
AF: Institute of Rock Structure and Mechanics AS CR, V Holesovickach 41, Praha, 18209,
Czech Republic
AB:
A novel method called Generalized Average of Signals (GAS) was developed and tested during the last two years
(Málek et al., in press). This method is designed for processing of seismograms from dense seismic arrays and
is convenient mainly for denoising and weak phase detection. The main idea of the GAS method is based on
non-linear stacking of seismograms in frequency domain, which considerably improves signal-to-noise ratio of
coherent seismograms.
Several synthetic tests of the GAS method are presented and the results are compared with the PWS method of
Schimell and Paulssen (1997). Moreover, examples of application on real data are presented. These examples
were chosen to show a broad applicability of the method in experiments of different scales. The first one shows
identification of S-waves on seismograms from shallow seismic. The second one concerns identification of
converted waves from local earthquakes registered at the WEBNET local network in western Bohemia. Finally, the
third one depicts identification of PKIKP onsets on seismograms of teleseismic earthquakes.
Schimmel, M., Paulssen H. (1997): Noise reduction and detection of weak, coherent signals through phase-
weighted stacks. Geophys. J. Int. 130, 497-505.
Málek J., Kolínský P., Štrunc J. and Valenta J. (2007): Generalized average of signals (GAS) - a new method for
detection of very weak waves in seismograms. Acta Geodyn. et Geomater., in press.
UR: http://www.irsm.cas.cz
DE: 7290 Computational seismology
SC: Seismology [S]
MN: 2007 Fall Meeting