Skip to main content
Progress in Earth and Planetary Science
Fig. 3 | Progress in Earth and Planetary Science

Fig. 3

From: Spatial pattern in stress drops of moderate-sized earthquakes on the Pacific Plate off the south-east of Hokkaido, Japan: implications for the heterogeneity of frictional properties

Fig. 3

a Example of an analyzed waveform of an earthquake with M4.8. The color lines indicate the three time windows used in deconvolution, which were (S0) − 0.50 to 9.73 s, (S1) 0.78 to 11.01 s, and (S2) 2.06 to 12.29 s after the S arrival. The gray line shows a time window from 12.00 to 1.77 s before the arrival time of the P wave, which was used to calculate the spectrum of a noise in (b). Each time window has 1024 data points. b Spectra of waveforms for the four time windows shown in (a). c Example of a waveform of an M3.5 earthquake that was used for an EGF. Note that the vertical scales in (a) and (c) are different. d Spectra of waveforms for the four time windows shown in (c). e Deconvolved spectra with the fitted omega-squared model. The color lines are deconvolved source spectra, that is, (b) divided by (d), for three individual time windows with a resampling of frequency bands. The black broken line shows the fitted omega-squared model with corner frequencies of 3.16 and 12.6 Hz for analyzed and EGF earthquakes, respectively

Back to article page