Monitoring Local Earthquakes in Central Italy Using 4C Single Station Data

Abstract

In this study, performed on a set of twenty-two earthquakes that occurred in central Italy between 2019 and 2020, we will explore the possibility to locate the hypocenter of local events by using a ring laser gyroscope observing the vertical ground rotation and a standard broadband seismometer. A picking algorithm exploiting the four components (4C) polarization properties of the wavefield is used to identify the first shear onset transversely polarized (SH). The wavefield direction is estimated by correlation between the vertical rotation rate and the transverse acceleration. The picked times for Pg and Sg onsets are compared to the ones obtained after manual revision on the GIGS station seismometer. The results are compared with the location provided by the national monitoring service of the INGV.

Rotation Rate Sensors and Their Applications

“…In this Special Issue, Sollberger et al [ 18 ], provide a review of the most recent advances in the field of rotational seismology. Simonelli et al [ 19 ] explored the possibilities of locating hypocenters of local seismic events with a combination of classical three-component translational observations and direct vertical rotation rate observations from an active ring-laser gyroscope. Teisseyre et al [ 20 ] studied seismic rotational motions generated by multiple mining blasts with three different measuring systems.…”