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Abstract:
Horizontal-to-vertical (H/V) spectral ratios have proven to be an inexpensive and easy tool to gain insight into local site effects. Here we attempt to extend the method to distributed acoustic sensing data by combined processing of records from an array of 26 broadband seismometers and a 1.5 km long fibre optic cable on the North-East flank of Etna volcano. Using the same processing steps as for conventional H/V computing on seismometers, we derive spectral ratios along the trajectory of the fibre.Results show, that this approach is suited to assess the site response in higher spatial resolution than with broadband seismometers only. The H/V peak frequency distribution generally agrees with results from the array, in some parts indicating otherwise not resolved geological structures. Localized strong amplitude changes in the spectral ratio, coincide with the cable crossing known fault zones.
