EOSC 114 Lecture Notes - Lecture 13: Lahar, Hazard Analysis, Thermography

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Published on 3 Feb 2018
School
Course
Professor
Volcanoes 5
Volcano Monitoring and predicting eruptions
Learning Objectives
ձ List six volcano monitoring techniques, the instruments that are
used, the information each provides and describe their relative
importance for prediction of volcanic events
ղ Characterize the hazards and relative risks to Vancouver and
surrounding areas if Mt Baker erupts.
ճ Interpret standard eruption warning levels in terms of actions that
could or should be taken, for any given location.
մ Assess the risk (i.e. potential loss or damage that might occur to
any given community or location in the event of an eruption
յ Build a volai hazard ap ased o the volao, it’s
topography including rivers/streams, and community locations,
taking into account hazards, vulnerability, and risk levels.
Volcanic Hazard: any potentially dangerous volcanic process (eg. Lava flows, pyroclastic flows, ash
fallout, lahars)
Volcanic Risk: any potential loss or damage as a result of the volcanic hazard that might be incurred by
persons, property etc. (eg you and your family)
Risk: ot oly iludes the potetial oetary ad hua losses, ut also iludes a populatio’s
vulnerability hazard maps
Note: volcanic eruptions have a much larger warning
phase before the onset of eruption, and eruptions
can last much longer than other natural hazards.
Volcano Monitoring and Prediction
STEP 1: Geology and mapping hazard maps
STEP 2: Monitoring
- Seismology earthwuakes
- Ground deformation (volcano changes shape)
- Gas emission
- Thermal imaging
- Lahar flow detection
- Satellite observation
STEP 3: Prediction and Hazard analysis
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Document Summary

Volcanic hazard: any potentially dangerous volcanic process (eg. lava flows, pyroclastic flows, ash fallout, lahars) Volcanic risk: any potential loss or damage as a result of the volcanic hazard that might be incurred by persons, property etc. (eg you and your family) Risk: (cid:374)ot o(cid:374)ly i(cid:374)(cid:272)ludes the pote(cid:374)tial (cid:373)o(cid:374)etary a(cid:374)d hu(cid:373)a(cid:374) losses, (cid:271)ut also i(cid:374)(cid:272)ludes a populatio(cid:374)"s vulnerability hazard maps. Note: volcanic eruptions have a much larger warning phase before the onset of eruption, and eruptions can last much longer than other natural hazards. Step 1: geology and mapping hazard maps. Step 1: geology and mapping hazard maps: map volcanic deposits, determine deposit type (lava flow, mud flow, pyroclastic flow) and distribution, determine age of deposits and eruption frequency, consider the risk. Seismology earthquakes: most important tool for monitoring and forecasting, small tremors, baseline monitoring essential to recognize changes abnormal behaviour.

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