Publication Citation

USGS Series Open-File Report
Report Number 2009-1018
Title Methods of Mmax Estimation East of the Rocky Mountains
Edition - Online Only
Language ENGLISH
Author(s) Wheeler, Russell L.
Year 2009
Originating office U.S. Geological Survey
USGS Library Call Number
Physical description iv, 44 p.
ISBN
Northernmost latitude 0550000
Southernmost latitude 0250000
Easternmost longitude -0600000
Westernmost longitude -1150000

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Abstract

Several methods have been used to estimate the magnitude of the largest possible earthquake (Mmax) in parts of the Central and Eastern United States and adjacent Canada (CEUSAC). Each method has pros and cons. The largest observed earthquake in a specified area provides an unarguable lower bound on Mmax in the area. Beyond that, all methods are undermined by the enigmatic nature of geologic controls on the propagation of large CEUSAC ruptures. Short historical-seismicity records decrease the defensibility of several methods that are based on characteristics of small areas in most of CEUSAC. Methods that use global tectonic analogs of CEUSAC encounter uncertainties in understanding what 'analog' means. Five of the methods produce results that are inconsistent with paleoseismic findings from CEUSAC seismic zones or individual active faults.