Although rotational seismology has progressed in recent decades, the links between
rotational ground motion and site soil conditions are poorly documented. New experiments …

A newly developed mechanical sensor system, called a Rotaphone, for recording rotation
rate components is described. The sensor system is based on measurements of the …

Seismology is no longer based only on the analysis of observations made with classical
seismometers measuring translational motions or their time derivatives. More and more …

The application of rotational motion sensors has only recently proven to give new ways of
measuring seismic-wave-field properties when comparing the recorded data with …

Spatial derivatives of the seismic wave field are known to be sensitive to various site effects
(eg, cavity effects, topography, and geological inhomogeneities). In this study, the focus is on …

The analysis of rotational seismic motions has received considerable attention in the last
years. Recent advances in sensor technologies allow us to measure directly the rotational …

Rotational motions (torsional and rocking) induced by seismic waves have been essentially
ignored for a long time, first because rotational effects were thought to be small for man …

A new mechanical sensor system for recording the rotation of ground velocity has been
constructed. It is based on measurements of differential motions between paired sensors …

We present the analysis of rotational and translational ground motions from earthquakes
recorded during October–November 2016, in association with the Central Italy seismic …

33.6 Conclusions To measure rotation, it is better to use a system with two seismometers in
one enclosure, evenly (at three or more points) fixed to the basement. To measure rotation …