A Coda-Length Magnitude Scale For New England

M. P. Chaplin; S. R. Taylor; M. N. Toksöz

doi:10.1785/gssrl.51.4.15

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Research Article| October 01, 1980

A Coda-Length Magnitude Scale For New England

M. P. Chaplin;

M. P. Chaplin

Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

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S. R. Taylor;

S. R. Taylor

Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

*

Present address: Lawrence Livermore Laboratory, Code L-205, P. 0. Box 808, Livermore, CA 94550

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M. N. Toksöz

Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

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Author and Article Information

M. P. Chaplin

Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

S. R. Taylor

*

Present address: Lawrence Livermore Laboratory, Code L-205, P. 0. Box 808, Livermore, CA 94550

Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

M. N. Toksöz

Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

Publisher: Seismological Society of America

First Online: 09 Mar 2017

Online ISSN: 1938-2057

Print ISSN: 0895-0695

Seismological Research Letters (1980) 51 (4): 15–22.

https://doi.org/10.1785/gssrl.51.4.15

Abstract

An empirical coda-length (signa] duration) magnitude scale is developed to estimate magnitudes for earthquakes in New England. The formula is based on the mean signal duration, T (in seconds), measured from 45 local earthquakes and is given by:

m_{b} = (Lg) = 2.21 * log 10 (T) - 1.70

For epicentral distances less than 600 km, the distante dependence is found to be negligibly small in comparison to other errors. Regional variations in signal duration suggest higher attenuation in southeastern New England than in New Hampshire.