the SUPERVOLCANO map Flashcards
What is the average ashfall range for a typical volcano eruption?
300 miles
How far did Yellowstone’s SUPER eruptions spread ash?
1500+ miles
How many number of eruptions were there from Yellowstone since its last SUPER eruption?
30
When was the most recent eruption at Yellowstone?
70,000 years ago
What do GPS satellites constantly measure for changes in?
Ground elevation
What is the main seismic monitoring agency?
University of Utah at Salt Lake City
What is the number of seismograph stations within and near Yellowstone to monitor quake activity?
33
What is the Official Federal Office for daily volcano monitoring?
Yellowstone Volcano Observatory (Y.V.O.)
How long ago was “Lava Creek” Tuff area of ash by SUPER eruption?
640,000 years ago
How long ago was “Huckleberry Ridge” Tuff area of ash by SUPER eruption?
2.1 million years ago
How long ago was “Mesa Falls” Tuff area of ash by SUPER eruption?
1.3 million years ago
What is the area and layer of soil created by volcanic eruption?
Tuff
What is the eruption “Hot Spot” source?
Magma Chamber
What is a caldera?
a prior eruption from the same hot spot underneath the region
What is the depth below the current Yellowstone caldera?
5 miles
What is the overall direction of North America’s plate movement over this hot spot?
Southwest
When was the first Yellowstone hot spot formed?
16 million years ago
What has magma pressure created since the last SUPER eruption?
Two Resurgent Domes
What is the approximate height for each 7 x 10 mile dome in Mallard Lake and Sour Creek?
1000 feet
How far has the caldera basin risen since the 1920’s?
2 feet
What are the dimensionsof Volcano Caldera?
35 x 50 mi.
