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Near volcanoes.
Lahar is an Indonesian word describing mudflowsand debris flows that originate from the slopes of a volcano. Both types of flows contain a high concentration of rock debris to give them the internal strength necessary to transport Hugh boulders as well as buildings and bridges and to exert extremely high impact forces against objects in their paths. Debris flows are coarser and less cohesive than mudflows. As lahars become dilute in downstream direction they become hyperconcentrated streamflows. Lacking internal strength, the mixture of rock debris and water takes on different flow properties. The coarser debris in this type of flow is no longer held in suspension by matrix strength and therefore settles to the bottom of the flow.
http://vulcan.wr.usgs.gov/Glossary/Lahars/description_lahars.HTML
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Are lahars hot?
They can be if they are triggered by an eruption melting snow and ice. However, some lahars occur from rainfall on old ash deposits that have had time to cool. These lahars are not hot.
Can mud flows and lahars be prevented?
Mudflows and lahars can be prevented or greatly reduced by planting deep rooted vegetation in places they might occur.
Why are snow covered volcanoes particulary dangerous?
When a snow-capped volcano erupts the heat produced can melt the snow. This can then mix with ash and form deadly mudflows called lahars. Deadly lahars can occur even with small eruptions.
Which is not an example of intrusive activity sills and dikes laccoliths lahars Batholiths?
Lahars are not intrusive. They are mudflows formed from extrusive material.
How can a lahar be prevented?
Lahars cannot be prevented. They are a natural phenomenon.
Are lahars hot?
They can be if they are triggered by an eruption melting snow and ice. However, some lahars occur from rainfall on old ash deposits that have had time to cool. These lahars are not hot.
Can mud flows and lahars be prevented?
Mudflows and lahars can be prevented or greatly reduced by planting deep rooted vegetation in places they might occur.
How often do lahars occur?
Lahar Indonesian term for a volcanic mudflow. Because they can occur before eruptions, after eruptions or without eruptions, they occur quite often.
Why are snow covered volcanoes particulary dangerous?
When a snow-capped volcano erupts the heat produced can melt the snow. This can then mix with ash and form deadly mudflows called lahars. Deadly lahars can occur even with small eruptions.
Are lahars examples of intrusive igneous activity?
No. Lahars are the result of extrusive activity.
Can tall structures prevent volanoes and lahars?
No. Tall structures will not affect volcanoes. Dams can potentially mitigate lahars.
Which is not an example of intrusive activity sills and dikes laccoliths lahars Batholiths?
Lahars are not intrusive. They are mudflows formed from extrusive material.
How are lahars are formed?
Lahars are the result of volcanic ash mixing with large amount of water. They can form in two ways. In some cases an erupting volcano can melt snow and ice near its summit. The resulting meltwater mixes with the ash and forms a lahar. A lahar can also occur without an eruption if heavy rain falls on ash deposits.
What are mudslides produced by volcanoes called?
Lahars
Are lahars dangerous?
Yes they are dangerous as the water can flood buildings
Does a lahar come out of an earthquake?
No. Lahars are mudflows that are produced by volcanoes.
How can a lahar be prevented?
Lahars cannot be prevented. They are a natural phenomenon.
