Question

5. Evaluating Volcanic Risks at Mountain View. The volcano near Mountain View, WA (Mt. Ataneq), was last active in 1850. The 1850 vent is now filled by a small, steaming crater lake (to the west of the summit). Prehistoric vents form the summit of the volcano, which is now covered by glaciers. If Mt. Ataneq erupts, you need to know what the risks are to the town of Mountain View (and your business) and surrounding towns (Baker City, Hoodtown) who provide commerce support. Thankfully, the USGS has developed volcanic hazard maps for Mt. Ataneq (see Blackboard). Mt. Ataneq eruptive history since 1400 C.E. 2000 ? 1900 • According to the eruptive history of Mt. Ataneq shown to the right, how often does this volcano erupt? 1800 • • Could we expect an eruption in the near future? How do you know? 1500 1400 L = dormant The most common types of volcanic hazards associated with eruptions of volcanoes such as Mt. Ataneq are lahars, lava flows, pyroclastic flows, and ash falls. However, not all occur with every eruption, so you will need to consider each one separately. As you consider these risks, you will want to rank the level of risk (1 = lowest; 4= highest) to your business and community. = active Feasible to rebuild? Would there be sufficient time to evacuate? If so, how long? Hazard level to human life if no evacuation: Rank (1=lowest risk; 4=highest risk) Ash falls Lahars Lava flows Pyroclastic flows 6. Deciding Where to Build. You have had a chance to briefly evaluate the different locations for locating your business. In which prospective city are you going to build your business? Why did you choose that city? Please indicate why you did not choose either of the other two cities.

Answer 1

5. As per the volcanic history the eruption takes place in every 100-130 years time span and every time when it occurs, we can expect 2 to 3 eruptions during the period of 20-40 years.

The last volcanic activity took place during 1860- 1880 and hence there are very high chances than we can see an activity in the very near future.

Ash falls: No time to evacuate, no hazards to human life, very feasible to rebuild and is having lowest risk (1).

Lahars: Yes we can expect some time to evacuate that is approximately in 1-2 hours, very less hazards to life, very difficult to rebuild and risk is moderate (2).

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