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Fig. 1 | Earth, Planets and Space

Fig. 1

From: Scattering strength at active volcanoes in Japan as inferred from the peak ratio analysis of teleseismic P waves

Fig. 1

Examples of the Mean-Squared (MS) seismogram envelope for the 2–4 Hz band. Shown are from station AIRH of the Hi-net network (top) and station SFT2 of the JMA network (bottom). These stations are chosen because both are borehole stations and both are close to the Sakurajima volcano. The blue traces signify the transverse component envelopes, while the red traces signify the three-component sum envelopes. The dash and dash–dot lines are the vertical and radial component envelopes, respectively. The translucent lines mark the peaks of the transverse and the three-component sum seismogram MS envelopes. They are denoted as \({\widehat{\rm I}}_{T}^{peak}\) and \({\widehat{\rm I}}_{sum}^{peak}\), respectively, from which the peak amplitude ratio is calculated. Time is given in relation to the theoretical P wave arrival according to the ak135 model. Theoretical S wave arrival is outside the given time window

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