What Are Geohazards? - Deep ground motions
Deep ground motions describes processes that occur at significant depth within the earth's surface.
- Salt Tectonics: Localised motions associated with the movement of evaporate deposits, both uplift and subsidence is possible and is dependent on the exact mechanisms at play.
- Tectonic movements: Tectonic movements are broad scale processes affecting the Earth's crust in response to stresses introduced through movements of the Earth's plates.
- Earthquakes: Earthquakes are the observable effects of vibrations (known as seismic waves) within the Earth's crust arising from rapid stress release, typically along a fault zone. Ground shaking can also trigger secondary events such as landslides, liquefaction of water-saturated soft ground and tsunami.
- Volcanic Inflation/deflation: PanGeo contains information in ground instability associated with the inflation and deflation of the ground surface caused by magma volumes change. Sudden and catastrophic volcanic activity which can lead to the creation of lava flows, ash flows, debris and ash falls, and debris flows of various kinds is not described in PanGeo.