What is an epicenter?
It is the point on the ground directly above the source of an earthquake or directly below the point of an air burst explosion.
What was the Soviet Union?
The Soviet Union was the country formed by Russia and satellite countries from 1922 until 1991.
What is the N with the half arrow?
It indicates which direction north is.
What are the small circles labeled Homestead?
They are individual houses.
What direction are the rivers flowing?
The direction of the rivers is indicated by how its tributaries flow into them.
The river north of the epicenter is flowing to the northwest.
The river south of the epicenter is flowing to the southeast.
How many watersheds are depicted?
Two, one above the epicenter and one below.
It is likely that these two river systems eventually merge into one river and are both part of one watershed.
What is the relative elevation of the epicenter compared to the surrounding area?
It appears that the epicenter is on a ridge between two separate rivers.
What is the dashed line?
It is the limit of the area where trees were knocked down by the explosion.
Why is the dashed line not a circle?
Partly because the explosion was affected by the landscape, and partly because the explosion was moving at the time.
What are the dimensions of the area enclosed by the dashed line in miles?
About 50 km x 75 km
The conversion factor from kilometers to miles is about 0.6, so 30 miles x 45 miles.
What is the distance from Columbia to Boonville?
About 25 miles
What do the arrows represent?
The direction that trees were knocked down.
Why are the arrows in the pattern that they are?
They are generally pointing away from the center of the explosion. The length of the arrows also indicate how knocked over the trees are. The ones directly below the explosion were damaged but not knocked over as much because the force of the explosion was directed downward rather than out away from the explosion.
What event is this map depicting?
The Tunguska event which occurred in 1908 and is thought to have been a large asteroid that exploded over the epicenter in Siberia.
CoMo Science 
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