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Earth, Planets and Space
Fig. 7 | Earth, Planets and Space

Fig. 7

From: Near-field strain observations of the October 2013 Ruisui, Taiwan, earthquake: source parameters and limits of very short-term strain detection

Fig. 7

Pre-seismic high-frequency volumetric strain recorded at the four strainmeter sites. a Last 10 s preceding the first P arrival of low-pass filtered (high cut of 10 Hz) and detrended strain signals. The depicted oscillations are the signatures of the microseisms (surface waves generated at sea). The vertical line denotes the first P arrival at HGSB station (origin of time). b Same signals detrended and pass-band filtered in the interval [1–10 Hz] to remove the microseism energy at the first order. Note that the last second before mainshock has been truncated for the plot because of high-pass filtering instability of the dynamic pulse associated to first P-wave arrival. The standard deviation σ ε of each component is listed in Table 2. The traces have been shifted vertically for the plot

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