Open-File Report 2009-1018
AbstractSeveral 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. |
First posted May 1, 2009 Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge. |
Wheeler, Russell L., 2009, Methods of Mmax Estimation East of the Rocky Mountains: U.S. Geological Survey Open-File Report 2009–1018, 44 p.
Abstract
Introduction
Assessments Using Multiple Methods
Pros and Cons of Individual Methods
Observations
Acknowledgments
References Cited