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Parameters and a magnitude moment relationship from small earthquakes observed during hydraulic fracturing experiments in crystalline rocks
Author(s) -
Pearson C.
Publication year - 1982
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl009i004p00404
Subject(s) - magnitude (astronomy) , coda , geology , hydraulic fracturing , seismology , geothermal gradient , seismic moment , moment (physics) , radius , yield (engineering) , mineralogy , geophysics , geotechnical engineering , fault (geology) , physics , astrophysics , thermodynamics , computer security , classical mechanics , computer science
Using source parameters estimated from seismic spectra and magnitudes estimated from coda lengths, we demonstrate that the log‐linear relationship between moment and magnitude holds for events with magnitudes as low as −6. Using, as a data set, events induced by hydraulic fracturing experiments at the Fenton Hill, New Mexico, Hot Dry Rock (HDR) geothermal site, we find that the relationship between magnitude M and seismic moment (Mo) is log ( Mo ) = 17.27 + 0.77 M .Moreover, the linear relationship between seismic moment and source radius (r) holds for the Fenton Hill microearthquakes. Analyses of the Fenton Hill data yield the following relationship.log ( r ) = 2.28 + 0.19 log ( Mo ) .