The application of the statistics of extremes to seismic intensity values in Indiana allows the contouring of return periods for specific earthquake intensities. The contours show a region of low seismic activity running NW-SE through the center of the state; seismically, the quietest part of Indiana is Newton County. The highest seismic activity is recorded in the southwest corner of the state. The return periods for seismic events of intensity IV range from 20 to 45 years. Intensity VI events (slight damage) have return periods ranging from 80 to 240 years. Return periods for earthquakes rated intensity VII (moderate damage) range from 300 to 1,300 years. Higher intensities are not probable in Indiana, and therefore earthquake accelerations greater than 0.1 g are improbable.



Blakely, R. F., and Varma, M. M., 1976, The seismicity of Indiana described by return periods of earthquake intensities: Indiana Geological Survey Occasional Paper 16, 13 p., 10 figs., 4 tables.


You may also like:

Keywords: seismic, earthquake

Can't find what you're looking for? Feel free to contact us directly:

Indiana Geological and Water Survey
420 N. Walnut St.
Bloomington, IN 47404
812-855-7636 (phone)
812-855-2862 (fax)
IGWSinfo@indiana.edu

IGS Return Policy

  • Original sales receipt required.
  • Returns accepted within 30 days of purchase date.
  • Refund will be issued by the same method of payment as purchased.
  • Products must be returned in the same new condition as purchased.
  • Refunds on custom orders and digital products are NOT allowed.
  • Customers are responsible for paying shipping costs to return products.

Updated 8/19/2020