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Title: Seismic Safety Margins Research Program. Regional relationships among earthquake magnitude scales

Abstract

The seismic body-wave magnitude m{sub b} of an earthquake is strongly affected by regional variations in the Q structure, composition, and physical state within the earth. Therefore, because of differences in attenuation of P-waves between the western and eastern United States, a problem arises when comparing m{sub b}'s for the two regions. A regional m/sub b/ magnitude bias exists which, depending on where the earthquake occurs and where the P-waves are recorded, can lead to magnitude errors as large as one-third unit. There is also a significant difference between m{sub b} and M{sub L} values for earthquakes in the western United States. An empirical link between the m{sub b} of an eastern US earthquake and the M{sub L} of an equivalent western earthquake is given by M{sub L} = 0.57 + 0.92(m{sub b}){sub East}. This result is important when comparing ground motion between the two regions and for choosing a set of real western US earthquake records to represent eastern earthquakes. 48 refs., 5 figs., 2 tabs.

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (USA)
Sponsoring Org.:
Nuclear Regulatory Commission (NRC), Washington, DC (United States); USDOE
OSTI Identifier:
5073993
Report Number(s):
NUREG/CR-1457; UCRL-52745
ON: TI86002777; INIS-XA-N--031
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; EARTHQUAKE MAGNITUDE; REGIONAL ANALYSIS; DATA COVARIANCES; EARTHQUAKES; GEOGRAPHICAL VARIATIONS; SEISMIC P WAVES; SEISMIC EVENTS; SEISMIC WAVES; VARIATIONS; 580201* - Geophysics- Seismology & Tectonics- (1980-1989)

Citation Formats

Chung, D. H., and Bernreuter, D. L. Seismic Safety Margins Research Program. Regional relationships among earthquake magnitude scales. United States: N. p., 1980. Web. doi:10.2172/5073993.
Chung, D. H., & Bernreuter, D. L. Seismic Safety Margins Research Program. Regional relationships among earthquake magnitude scales. United States. doi:10.2172/5073993.
Chung, D. H., and Bernreuter, D. L. Thu . "Seismic Safety Margins Research Program. Regional relationships among earthquake magnitude scales". United States. doi:10.2172/5073993. https://www.osti.gov/servlets/purl/5073993.
@article{osti_5073993,
title = {Seismic Safety Margins Research Program. Regional relationships among earthquake magnitude scales},
author = {Chung, D. H. and Bernreuter, D. L.},
abstractNote = {The seismic body-wave magnitude m{sub b} of an earthquake is strongly affected by regional variations in the Q structure, composition, and physical state within the earth. Therefore, because of differences in attenuation of P-waves between the western and eastern United States, a problem arises when comparing m{sub b}'s for the two regions. A regional m/sub b/ magnitude bias exists which, depending on where the earthquake occurs and where the P-waves are recorded, can lead to magnitude errors as large as one-third unit. There is also a significant difference between m{sub b} and M{sub L} values for earthquakes in the western United States. An empirical link between the m{sub b} of an eastern US earthquake and the M{sub L} of an equivalent western earthquake is given by M{sub L} = 0.57 + 0.92(m{sub b}){sub East}. This result is important when comparing ground motion between the two regions and for choosing a set of real western US earthquake records to represent eastern earthquakes. 48 refs., 5 figs., 2 tabs.},
doi = {10.2172/5073993},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {5}
}