Refer to MAPS for this question by following this link: https://mapwatch.com/gal

Question

Refer to MAPS for this question by following this link: https://mapwatch.com/gallery/volcanic-hazard-map.shtml this is a hazard prediction map and hazard map of eruptive materials for Mount Rainier (Note: dates from 1991) 1. What is the annual probability of ash fall of 1 cm in the Mount Rainier region? 2. What large city is likely impact on this city- that is, what geologic hazard or hazards are most likely to impact? 3. What information did the hazard map-makers use to determine the possible hazards and their extent? (there are several likely) What geographic features determines the nature of the lahar distribution- you will note that these are not found everywhere? How might you account for the variable width of the predicted lahars?+ 4. 5.

Explanation / Answer

1) Annual probability of ash fall of 1 centimeters of 1 in 500.

2) Seattle, Tacoma and Washington are the large cities likely to be impacted by an eruption of Mount Rainier.

3)

Disaster prevention is necessary to protect human lives, properties and social infrastructure against disaster. One of the basic thing to decrease the loss of life and damages is to eradicate the disaster phenomenon or the point of contact with social activities.

There are some important types of essential information for disaster prevention:-

4) Lahars are the debris flow consists of large amount of volcanic materials. It consisted of slurry of pyroclastic material, and water. There are three main classes of lahars

(1) formed by the direct and immediate result of eruptions through crater lakes and heavy rains falling during or immediately after an eruption on abundant unstable loose material.

(2) Created indirectly from eruptions such as normally happen shortly after eruptions by triggering of lahars from earthquakes

(3) Also these are not linked to simultaneous volcanic activity, happening by draft of loose tephra by heavy rain or meltwater from snow seeping into loose debris at any phase of volcano cone-building or cone degradation.

5) Lahars typically move down valleys. It has a wide range of velocities - 1 m/s to 40 m/s. It depends on the channel width, volume of the flow, and grain size composition. It can move long distances. It also transport very large boulders.

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