||A great deal of information can be found at the
Cooperative mapping programs between the USGS and the State of
Indiana began in the 1920's. Among the most popular products are the
topographic maps at the scale of 1:24,000 (1 inch on the map
represents 2,000 feet on the ground). These maps depict basic
natural and cultural features of the landscape, such as lakes and
streams, highways and railroads, boundaries, and geographic names.
Contour lines are used to depict the elevation and shape of the
terrain. Indiana, which is covered by 710 maps at this scale, was
the first State under the program to have complete coverage. The
maps are used not only by engineers, scientists, and resource
managers, but also by the general public who enjoy hiking,
exploring, and other outdoor activities.
Interesting Midwest earthquake info from the USGS:
The central Mississippi Valley is the most earthquake-prone
region of the United States east of the Rocky Mountains. Crosses
show the locations of the many earthquakes recorded in the New
Madrid seismic zone since 1974.
In the winter of 1811-12, the central Mississippi Valley was struck
by three of the most powerful earthquakes in U.S. history. Even
today, this region has more earthquakes than any other part of the
United States east of the Rocky Mountains. Government agencies,
universities, and private organizations are working to increase
awareness of the earthquake threat and to reduce loss of life and
property in future shocks.
The 400 terrified residents in the town of New Madrid (Missouri)
were abruptly awakened by violent shaking and a tremendous roar. It
was December 16, 1811, and a powerful earthquake had just struck.
This was the first of three magnitude-8 earthquakes and thousands of
aftershocks to rock the region that winter.