Seismotectonic maps in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky - Digital Spatial Database: Locations of stress orientations

NOTE: Location of one point, near -88.65, 38.95, was incorrect
when Sheet A was published. The location is .5 degree south, and
is corrected in this dataset.
This cover contains locations of places where greatest horizontal
compressive stress (S(Hmax)) orientations have
been determined either by observation of well-bore breakouts or where
focal mechanism solutions have been determined from earthquakes.
Well-bore breakouts are observed from 0 to 1.4 km, whereas earthquakes
generally occur deeper. The earthquake focal mechanisms
show both reverse and strike-slip faulting. Overall the stress
indicators show easterly trending S(Hmax).