Disaster managementOther risks
A number of other risks occur which may affect residents in the Moreton Bay region.
Although these hazards are less likely to impact the region on a regular basis, it is important to be aware of them and understand what actions to take to minimise their impact.
For additional information about these risks and key points on how to prepare, visit:
A tsunami is a series of fast moving waves produced during large scale ocean disturbances.
A tsunami can occur with very little warning and can be caused by a variety of natural or technological events such as:
- Volcanic eruptions
- Meteorite impacts
Earthquakes are a shaking or trembling of the Earth's crust caused by the release of huge stresses due to underground volcanic forces, the breaking of rock between the surface, or by a sudden movement along an existing fault line.
Earthquakes are unpredictable and strike without warning.
They range in strength from slight tremors to great shocks lasting from a few seconds to a few minutes.
Landslides usually involve the movement of large amounts of earth, rock, sand or mud or any combination of these.
This can be caused by:
- Soil saturation from rainfall or seepage or by human activity
(eg. vegetation removal, construction on steep terrain)
The rate of movement of a landslide can vary from exceptionally slow - centimetres per year, to a sudden and total collapse - such as an avalanche of perhaps millions of tonnes of debris.
The distance travelled by landslide debris can also vary greatly, from a few centimetres in 'ground slumps', to many kilometres when large mud flows follow river valleys.
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