September 16, 2023 @ 11:00 am – 12:00 pm
George Rogers Clark National Historical Park will host subject matter experts on a discussion of earthquakes along the Wabash River. The presentation titled “Paleoseismic Liquefaction Evidence for Strong Pre-Historic Earthquakes in Southern Indiana and Illinois” is open to the public in the park theater at 11 am on September 16. Speakers include:
• Stephen F. Obermeier, US Geological Survey, Retired
• Robert L. Nowack, Professor of Geophysics, Emeritus, Purdue University
• Ronald C. Counts, Associate Director of the Miss. Mineral Resources Institute and Associate Professor Department of Geology and Geological Engineering at the University of Mississippi.
Other subject matter participants include:
• James Conder, Professor of Geophysics at Southern Illinois University Carbondale
• Jose Luis Antinao-Rojas, Indiana Geological & Water Survey, and Indiana Univ. Bloomington
In this presentation, paleoseismic liquefaction features in southern Indiana and Illinois will be described. Although there has been regularly occurring small to moderate sized earthquakes in this region in recent and historic times, paleoliquefaction features have been used to infer the existence of past large pre-historic earthquakes over the last 15,000 years along the Wabash Valley Seismic Zone. The occurrence of paleo-earthquakes has important implications for the engineering seismic hazard for this region.
There is no charge or registration to attend this discussion. The park film “Longknives” will resume around 12:30 after the presentation concludes. The George Rogers Clark NHP Visitor Center and Memorial are located at 401 South 2nd St. in Vincennes, Indiana. Please call Joe Herron at 812-882-1776 for questions or email GERO_Ranger_Activities@nps.gov .