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Fig. 1 | Earth, Planets and Space

Fig. 1

From: Reply to comment by Vallée et al. on “Earthquake-induced prompt gravity signals identified in dense array data in Japan”

Fig. 1

Step-by-step results of the signal processing procedure employed by Vallée et al. (2017). “Acc.” and “Amp.” are the abbreviations of “Acceleration” and “Amplitude”, respectively. a Input acceleration waveform, which increases in proportion to \(t^{5}\) for \(t = 0{-}150\) s and is zero before and after the time range. The sampling rate, number of points, and time window are 20 Hz, 72,000, and \(t = - 1800{-}1800\) s, respectively. b Expected output waveform from the broadband seismometer installed at FUK (Fukue). Here, the instrument response of the seismometer was convolved in the frequency domain using the “transfer” command of SAC. c Truncated at \(t = 100\) s and deconvolved output waveform (black) as well as truncated input acceleration waveform (red). Here, the deconvolution was performed using the “transfer” command, as before. The offset of the black curve is thought to be due to the zero response at zero frequency. d Truncated, deconvolved, and 0.002–0.03-Hz band-pass-filtered output waveform (black) as well as truncated and band-pass-filtered input acceleration waveform (red). e Difference between them, i.e., black curve minus red curve in d

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