Seismic Hazard Map
Magnitude 4.0 YOUNGSTOWN-WARREN AREA, OHIO
Saturday, December 31, 2011 at 20:04:58 UTC
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
State boundaries in blue; county boundaries in green.
USGS National Seismic Hazard Mapping Project
Preliminary Earthquake Report
U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver
