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7 Introduction
7.1 Approaches and Data Used to Define Seismotectonic Zones
7.2 RLME Sources in the Seismotectonic Zones Branch
7.3 Seismotectonic Source Zones
7.3.1 St. Lawrence Rift Zone (SLR)
7.3.1.1 Background
7.3.1.1.1 Iapetan Rifting
7.3.1.1.2 St. Lawrence Rift
7.3.1.1.3 Charlevoix RLME Source
7.3.1.1.4 Ottawa-Bonnechere Graben
7.3.1.1.5 Saguenay Graben
7.3.1.1.6 Lower St. Lawrence
7.3.1.1.7 Adirondack Mountains
7.3.1.2 Basis for Defining Seismotectonic Zone
7.3.1.3 Basis for Zone Geometry
7.3.1.4 Basis for Zone Mmax
7.3.1.5 Future Earthquake Characteristics
7.3.2 Great Meteor Hotspot Zone (GMH)
7.3.2.1 Background
7.3.2.1.1 Geological Evidence
7.3.2.1.2 Evidence for Reactivation
7.3.2.1.3 Geophysical Evidence
7.3.2.2 Basis for Defining Seismotectonic Zone
7.3.2.3 Basis for Zone Geometry
7.3.2.4 Basis for Zone Mmax
7.3.2.5 Future Earthquake Characteristics
7.3.3 Northern Appalachian Zone (NAP)
7.3.3.1 Background
7.3.3.1.1 Geological Evidence
7.3.3.1.2 Geophysical Data
7.3.3.1.3 Seismicity
7.3.3.2 Basis for Defining Seismotectonic Zone
7.3.3.3 Basis for Zone Geometry
7.3.3.4 Basis for Zone Mmax
7.3.3.5 Future Earthquake Characteristics
7.3.4 Paleozoic Extended Crust (PEZ)
7.3.4.1 Background
7.3.4.1.1 Giles County, Virginia, Seismic Zone (GCVSZ)
7.3.4.1.2 Eastern Tennessee Seismic Zone (ETSZ)
7.3.4.1.3 Clarendon-Linden Fault System
7.3.4.2 Basis for Defining Seismotectonic Zone
7.3.4.3 Basis for Zone Geometry
7.3.4.3.1 PEZ Narrow
7.3.4.3.2 PEZ Wide
7.3.4.4 Basis for Zone Mmax
7.3.4.5 Future Earthquake Characteristics
7.3.5 Ilinois Basin Extended Basement Zone (IBEB)
7.3.5.1 Background
7.3.5.2 Basis for Defining Seismotectonic Zone
7.3.5.3 Basis for Zone Geometry
7.3.5.4 Basis for Zone Mmax
7.3.5.5 Future Earthquake Characteristics
7.3.6 Reelfoot Rift Zone (RR)
7.3.6.1 Background
7.3.6.1.1 Evolution of the Reelfoot Rift
7.3.6.1.2 Major Structures
7.3.6.2 Basis for Defining Seismotectonic Zone
7.3.6.3 Basis for Zone Geometry
7.3.6.4 Basis for Zone Mmax
7.3.6.5 Future Earthquake Characteristics
7.3.7 Extended Continental Crust–Atlantic Margin Zone (ECC-AM)
7.3.7.1 Background
7.3.7.1.1 Crustal Structure
7.3.7.1.2 Geophysical Anomalies
7.3.7.1.3 Major Structures
7.3.7.1.4 Seismicity
7.3.7.2 Basis for Defining Seismotectonic Zone
7.3.7.3 Basis for Geometry
7.3.7.4 Basis for Mmax
7.3.7.5 Future Earthquake Characteristics
7.3.8 Atlantic Highly Extended Crust Zone (AHEX)
7.3.8.1 Basis for Defining Seismotectonic Zone
7.3.8.2 Basis for Geometry
7.3.8.3 Basis for Mmax
7.3.8.4 Future Earthquake Characteristics
7.3.9 Extended Continental Crust–Gulf Coast Zone (ECC-GC)
7.3.9.1 Basis for Defining Seismotectonic Zone
7.3.9.2 Basis for Zone Geometry
7.3.9.2.1 Southern Boundary
7.3.9.2.2 Western Boundary
7.3.9.2.3 Eastern Boundary
7.3.9.2.4 Northern Boundary
7.3.9.3 Basis for Zone Mmax
7.3.9.4 Future Earthquake Characteristics
7.3.9.5 Possible Paleoliquefaction Features in Arkansas, Louisiana, and Mississippi
7.3.10 Gulf Coast Highly Extended Crust Zone (GHEX)
7.3.10.1 Basis for Defining Seismotectonic Zone
7.3.10.2 Basis for Zone Geometry
7.3.10.3 Basis for Zone Mmax
7.3.10.4 Future Earthquake Characteristics
7.3.11 Oklahoma Aulacogen Zone (OKA)
7.3.11.1 Basis for Defining Seismotectonic Zone
7.3.11.2 Basis for Zone Geometry
7.3.11.3 Basis for Zone Mmax
7.3.11.4 Future Earthquake Characteristics
7.3.12 Midcontinent-Craton Zone (MidC)
7.3.12.1 Background
7.3.12.1.1 Precambrian Crustal Basement Structure
7.3.12.1.2 Major Precambrian Basement Structures
7.3.12.1.3 Geophysical Anomalies
7.3.12.1.4 Seismicity
7.3.12.2 Basis for Defining Seismotectonic Zone
7.3.12.3 Basis for Zone Geometry
7.3.12.4 Basis for Zone Mmax
7.3.12.5 Future Earthquake Characteristics
7.4 Maximum Magnitude Distributions for Seismotectonic Distributed Seismicity Sources
7.4.1 Maximum Observed Earthquake Magnitude
7.4.2 Mmax Distributions
7.5 Recurrence Parameters
7.5.1 Rate and b-Value Maps for Single Zone and Two Zones
7.5.2 Comparison of Recurrence Parameters to Catalog
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