Editing Geological hazard (section)

==Speed of development==

===Sudden phenomena===
Sudden phenomena include:
* [[avalanche]]s (snow or rock) and its runout
* [[earthquake]]s and earthquake-triggered phenomena such as [[tsunami]]s
* [[forest fire]]s (espec. in Mediterranean areas) leading to [[deforestation]]
* [[geomagnetic storms]]<ref>[http://www.nationalatlas.gov/articles/geology/a_geohazards.html ''Geologic Hazards'' NationalAtlas] {{webarchive|url=https://web.archive.org/web/20100430002306/http://www.nationalatlas.gov/articles/geology/a_geohazards.html |date=2010-04-30 }}</ref>
* [[cambering (geology)|gulls]] (chasms) associated with cambering of valley sides
* [[ice jam]]s (Eisstoß) on rivers or [[glacial lake outburst flood]]s below a [[glacier]]
* [[landslide]] (displacement of earth materials on a slope or hillside)
* [[mudflow]]s (avalanche-like muddy flow of soft/wet soil and sediment materials, narrow landslides)
* [[pyroclastic flows]]
* [[rockfall]]s, [[rock slide]]s, ([[rock avalanche]]) and [[debris flow]]s
* torrents ([[flash flood]]s, rapid floods or heavy current creeks with irregular course)
*[[liquefaction]] (settlement of the ground in areas underlain by loose saturated sand/silt during an earthquake event)
* [[volcano|volcanic eruptions]], [[lahar]]s and [[ash fall]]s.

===Slow phenomena===
Gradual or slow phenomena include:
* [[alluvial fan]]s (e.g. at the exit of [[canyon]]s or [[side valley]]s)
* [[caldera]] development (volcanoes)
* [[geyser]] [[deposition (geology)|deposit]]s
* ground settlement due to consolidation of compressible soils or due to collapseable soils (''see also [[Soil compaction|compaction]])
* ground [[subsidence]], [[sag (geology)|sag]]s and [[sinkhole]]s
* [[sand dune]] migration
* shoreline and stream [[erosion]]
* [[thermal spring]]s