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Earth, Planets and Space
Fig. 12 | Earth, Planets and Space

Fig. 12

From: The time lag between deformation process and seismic activity in El Hierro Island during the eruptive process (2011–2014): a functional phased approach

Fig. 12

Derivative curves of the displacement curves in the p-splines basis by considering data series up to 14, 16, 18, 20, 22 and 24 days after Jun 28, 2011. The black vertical line indicates the beginning of the timeseries data used to calculate the minimun slope level. When calculating the level, the first 30 data are not considered for the oscillations that occur at the beginning of the b-splines curves. The red vertical line marks the 28th of June 2011. In c, data are corresponded with 18 days after this date, i.e., July 16, the curve crosses the horizontal line that marks the minimum level. In this moment the introduced method could activate a warning system. Since the beginning of seismicity is established the 29th of July 2011, the method could activate the warning system approximately 13 days before this moment

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