MICHIGAN
N IGA LAKE MICH ELKHART LAGRANGE STEUBEN ST JOSEPH LAPORTE
DEKALB PORTER MARSHALL NOBLE LAKE KOSCIUSKO STARKE Unnamed
Unnamed lt JASPER au F WHITLEY
PULASKI FULTON r NEWTON te en ALLEN C
al oy R HUNTINGTON WABASH
CASS MIAMI WHITE ADAMS Kentland WELLS Wolcott Disturbance Fault CARROLL BENTON GRANT HOWARD BLACKFORD JAY
WARREN Sharpsville CLINTON Fault TIPPECANOE TIPTON DELAWARE
t l u a F FOUNTAIN HAMILTON MONTGOMERY MADISON RANDOLPH le il v t BOONE r
o
F
WAYNE HENRY lt u HANCOCK GEOa MARION F
HENDRICKS
Notes
e PARKE ill PUTNAM tv VERMILLION r FAYETTE o F RUSH SHELBY
UNION Faults of Southwestern IndianaJOHNSON MORGAN CLAY FRANKLIN
O I H O VIGO OWEN DECATUR
MONROE BARTHOLOMEW BROWN DEARBORN SULLIVAN RIPLEY GREENE Mt. Carmel Leesville Fault Anticline JENNINGS OHIO
JACKSON Unnamed SWITZERLAND LAWRENCE JEFFERSON R IVE O R KNOX DAVIESS HIO MARTIN ILLINOIS R SCOTT E V I ORANGE WASHINGTON R
CLARK
Y H S K A PIKE B Georgetown A DUBOIS Fault FLOYD C W U GIBSON CRAWFORD T Crandall N Fault E K PERRY Wabash Valley HARRISON Fault System WARRICK Indian SPENCER POSEY Creek Hawesville Fault VANDERBURGH Fault
German
Ridge Fault
O H IO Africa Fault
When ancient bedrock faults were formed, earthquakes were Wasbash Valley Fault System, which reaches into Indiana, probably common in southwestern Indiana. While these is the northern extension of the New Madrid faults. The buried faults are not known to be associated with modern recurrence of such earthquakes could have disastrous conse- earthquakes, even more intense earthquakes in the region quences in Indiana. have been related to the New Madrid Seismic Zone, a major Indiana Geological Survey geologists have located many area of earthquake activity in the midcontinent region of earthquake-induced liquefaction features within the Wabash North America. In 1811–12, three major earthquakes near Valley seismic zone, suggesting that at least two strong earth- New Madrid, Missouri, were among the greatest in recorded quakes occurred within the last 1,200 years. history in North America. Many scientists believe that the
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