Cloaking of a seismic source located inside the core of the meta-city cloak at 10 Hz (A), (C). These are concrete buildings on a concrete plate. One notices in (A), (C) that the field outside the cloak has reduced amplitude and is almost isotropic, which is a hallmark of cloaking a sensor in optics. The benchmark of a 10 Hz seismic source in a homogeneous plate in (D) makes clear the cavity like effect of the invisibility region in (A), (C).