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Borehole Volumetric Strainmeter Calibration From a Nearby Seismic Broadband Array at Etna Volcano
Author(s) -
Currenti G.,
Zuccarello L.,
Bonaccorso A.,
Sicali A.
Publication year - 2017
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1002/2017jb014663
Subject(s) - borehole , seismometer , seismology , geology , calibration , broadband , vertical seismic profile , geodetic datum , volcano , geodesy , acoustics , remote sensing , optics , physics , geotechnical engineering , quantum mechanics
Abstract Strainmeter and broadband seismic signals have been analyzed jointly with the aim of calibrating a borehole strainmeter at Etna volcano by using a seismo‐geodetic technique. Our results reveal a good coherence between the dynamic strains estimated from seismometer data and strains recorded by a dilatometer in a low‐frequency range [0.03–0.06 Hz] at the arrival of teleseismic waves. This significant coherence enabled estimating the calibration coefficient and making a comparison with calibration results derived from other methods. In particular, we verified that the proposed approach provides a calibration coefficient that matches the results obtained from the comparison of the recorded strain both with theoretical strain tides and with normal‐mode synthetic straingrams. The approach presented here has the advantage of exploiting recorded seismic data, avoiding the use of computed strain from theoretical models.