volcanic hazards Flashcards
spatial distribution
along constructive or destructive plate boundaries, or located on hotspots
what is vulvanicity measured using?
the volcanic explosively index.
magnitude - the more powerful….
the more explosive
frequency of eruptions…
varies per volcano
how are frequency of volcanoes classed?
active, dormant or extinct?
how many volcanoes erupt each month?
50-60
has the frequency of volcanic eruptions changed ?
no
how are volcanic eruptions regular?
the eruptions on each type of boundary are similar
what can help estimate when eruptions take place?
reguarlrity of eruptions
what can indicate an imminent eruption?
seismic activity, gases releasing, elevation etc.
there is no…. to prediction to a volcanic eruption
no definite predictions
what are some hazards caused by volcanoes?
lava flows, lahars, floods, tephra, toxic gases, acid rain, nuees Ardentes/pyroclastic flows
what are lahars?
mudflow
what causes lahars?
number of reasons, usually by melting ice at high latitudes
what causes floods?
from melting ice sheets or glaciers at high latitudes