Two hundred years ago the New Madrid earthquakes shook up our part of the world and still hold our interest. Research scientist Susan Hough, whose books make science accessible to us all, will speak on the massive New Madrid earthquakes at the Mercantile Library in a program jointly sponsored by the Library and Betts House. An exhibition, The Big Shake – How the 1811-1812 New Madrid Earthquakes Rocked the Ohio River Valley, is currently on view at Betts House, Ohio's oldest brick house, at 416 Clark St. Hough will also talk about Charles Richter, born in Hamilton, Ohio, who invented the Richter Scale for measuring earthquakes. Thursday, March 8. 6:30 p.m. Admission to the lecture includes admission to Betts House to see the exhibition, on view through May 31.$10 for Mercantile Library Members, $15 for non-members. The Mercantile Library is at 414 Walnut St. downtown.