ESS Final quesitons - Potential volcanic activity is...

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Potential volcanic activity is assessed by? Ground deformation, gas emission and earthquakes For Mt. St. Helens since 1980, what has been the most reliable warning of eruptive behavior? Decreasing depth of earthquakes Why are lahars so dangerous? They can be triggered by many things and can travel rapidly What is the most effective way to survive a lahar? Get to high ground as soon as you know it’s coming Which of following foes not contribute to instability and collapse of stratovolcanoes such as Mt. Rainier Thick, heavy lava flow Should a lahar occur on Mt. Rainier, local inhabitants will have About 15 minutes to two hours to evacuate The threat from lahars on Mt. Rainier is made worse by the fact that The mountain has more glacial ice than other cascade volcanoes Compared to the modern high cascades, subduction-zone volcanism during the prior of the west cascades was More extensive and of greater volume What type of advanced warning will a hot debris avalanche most likely provide Increase in shallow earthquakes What type of advanced warning will a cold avalanche most likely provide No significant warning Lahar warning systems around Mt. Rainier are Installed and have a poor record of effectiveness Over the last 5600 years, Mt. Rainier has Lost size much more than any gains One prominent justification for originally declaring Yellowstone a national park was its Abundant and varied hydrothermal features
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Yellowstone’s mantle plume produces mafic magma which Ascends with difficulty through the continental crust Basalt Erupts only in certain parts of Yellowstone During a typical Yellowstone caldera-forming ring eruption, the cap above the magma chamber Sinks into the ground At Yellowstone, which threat is most likely to occur with no detachable warning Phreatic explosions What does magnetism have to do with monitoring Yellowstone magmatism Warm rock becomes less magnetized Approximately when was the most recent large eruption of Santorini 3660 years ago what indicates that Santorini produced a Plinian eruptive column prior to its pyroclastic flows and surges airfall deposits underneath flow and surge deposits What is a fundamental limitation of treeing dating The trees must be selected from the same local climate After three half-lives have elapse, what fraction of the parent atoms will remain One eighth (0.125) Why is K-Ar dating only useful for rocks older than about 300,000 years Younger rocks contain too little argon Carbon-14 has a half-life of only about 5700 years, so why does it till exist
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