Cratering, Water, and the Chesapeake Bay

The Chesapeake Bay crater is the largest impact crater in the US.  The meteorite that struck Earth an estimate 35 million years ago cause water and rock to splash all over the entire East Coast, creating a crater larger than Rhode Island and killing all regional marine life.  This impact has helped form the river patterns seen in the area, as well as the Bay itself.

 

Chesapeake Bay Crater http://tinyurl.com/cgpbqbz

Chesapeake Bay Crater http://tinyurl.com/cgpbqbz

When I first learned that water doesn’t really slow down an asteroid impact, I was surprised.  It turns out that the kinetic energy of larger impacts is so great that most of the water is vaporized instantaneously and has little effect on the velocity of the meteorite.  This makes it so that, particularly in more shallow water, a crater from an impact like the one in the Chesapeake Bay looks very similar to a land impact of similar magnitude.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s