Map showing world’s three major “belts” (major plate boundaries) where the majority of the world’s earthquakes occur. Mid-Atlantic Ridge Ring of Fire Alpide Belt Alpide Belt Visual Credit: USGS Earthquake Hazard and Emergency Management: Session 3 Distribution Visual 3.1 3-1 Seismicity of North America North American Plate Pacific Plate Figure Credit: USGS Earthquake Hazard and Emergency Management: Session 3 Distribution 3-2 Visual 3.2 Map Showing Seismicity in S. California Figure Credit: USGS Earthquake Hazard and Emergency Management: Session 3 Distribution 3-3 Visual 3.3 Northern California Seismicity • Seismicity relatively well understood Earthquake Hazard and Emergency Management: Session 3 Distribution 3-4 Visual 3.4 Figure Credit: USGS Pacific Northwest – Cascadia Subduction Zone Figure Credit: USGS Earthquake Hazard and Emergency Management: Session 3 Distribution 3-5 Visual 3.5 Idaho, Utah, Wyoming • Recurring events along Wasatch Figure Credit: USGS Earthquake Hazard and Emergency Management: Session 3 Distribution 3-6 Visual 3.6 Central US Seismic Zones Figure Credit: USGS Earthquake Hazard and Emergency Management: Session 3 Distribution 3-7 Visual 3.7 Reelfoot Rift Figure Credit: USGS Earthquake Hazard and Emergency Management: Session 3 Distribution 3-8 Visual 3.8 Charlevoix Seismic Zone Credit: Natural Resources Canada Earthquake Hazard and Emergency Management: Session 3 Distribution 3-9 Visual 3.9 Southeastern Seismicity • TN relatively active • 1886 event not explained • magnetic signature from NC to GA similar to Charleston Epicenters of earthquakes (M>0.0) in the southeastern U.S. from 1977 through 1999. Figure Credit: VA Tech Seismological Earthquake Hazard and Emergency Management: Session 3 Distribution 3-10 Observatory (VTSO) Visual 3.10 Generalized US Seismic Hazard Map Earthquake Hazard and Emergency Management: Session 3 Distribution 3-11 Visual 3.11 USGS SEISMIC HAZARD MAP (PGA) http://eqhazmaps.usgs.gov/2002April03/US/USpga2500v4.gif 2% in 50 years Earthquake Hazard and Emergency Management: Session 3 Distribution 3-12 Visual 3.12 USGS seismic hazard map for California and Nevada Figure Credit: USGS Earthquake Hazard and Emergency Management: Session 3 Distribution 3-13 Visual 3.13.