The Ministry of Earth Sciences has confirmed that no natural earthquake was recorded in Wayanad and its adjoining areas by the seismographic stations installed in Kerala yesterday. The Ministry’s National Centre for Seismology (NCS) said that the felt tremor reported by media sources, accompanied by a rumbling sound, may be due to the shifting of unstable rock masses accumulated during landslides from one level to a lower level for better stabilization. The NCS added that this process may have generated subterranean acoustic vibrations due to frictional energy. The NCS further explained that this energy has the potential to propagate up to hundreds of kilometers through subsurface cracks and fractures associated with subterranean lineaments, which may have caused rumbling sounds and ground vibrations in the area as a natural phenomenon in landslide-prone zones. The Ministry advised that there is no need for panic due to this acoustic subterranean vibration, as no earthquake has been recorded.