Rotational seismology is attracting attention in the seismological community including seismic engineers interested in possible damages to man‐made constructions due to strong rotational ground motions. Mathematically, seismic rotation represents the curl of the seismic displacement u,

Seismic rotation, due to S waves, is nonzero even in a homogeneous isotropic medium. The inhomogeneity and anisotropy of seismic structures generate more complex wavefield patterns and hence more significant seismic rotations. Moreover, a complex seismic source can contribute considerably to the rotation field, namely in a near‐source zone.

In this paper we present a new six‐degree‐of‐freedom (6DOF) seismic sensor called Rotaphone and...

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