Subterranean rumbling

Subterranean rumbling refers to sounds or vibrations that occur beneath the Earth's surface. These phenomena can arise from various natural processes, including: 1. **Geological Activity**: Movements of tectonic plates, volcanic activity, or earthquakes can cause rumbling sounds as the Earth's crust shifts. 2. **Hydrothermal Activity**: The movement of hot water and steam in geothermal areas can create rumbling noises.