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Unformatted text preview: Mechanics of Earthquakes and Faulting Mechanics of Earthquakes and Faulting 25 Apr. 2007 Ear thquake Sour ce Pr oper ties and Scaling Source spectra for two events of equal stress drop: omega cube model Large and Small Eq log u at R 3 log freq. ( ) S L L S Highfreq. spectral properties: produced by rupture growth, represent nucleation and enlargement log a at R log freq. ( ) f max L S Earthquake Source Properties, Spectra, Scaling, Selfsimilarity M o L 3 o L1 ( 29 o3 cube model, 3 Similarity condition Source spectra for two events of equal stress drop: omega square model square model, 2 Two possible explanations 1) Similar ity condi ti on for nucleation, but highfr eq. asymptote is pr oduced by stopping phase associated with abr upt r uptur e ar r est (which pr oduces 1 decay) 2) !Similarity condition (notsimilarity). The events were different from the point of nucleation. f max for the large event is larger than that for the small event. Highfreq. spectral properties: produced by rupture growth, represent nucleation and enlargement M o L 3 o L1 ( 29 o3 log u at R 2 log freq. ( ) S L 3 log a at R log freq. ( ) f max f max L S L S Source spectra for two events of equal stress drop: omega square model log u at R 2 log freq. ( ) S L Highfreq. spectral properties: produced by rupture growth, represent nucleation and enlargement M o L 3 o L1 ( 29 o3 log a at R log freq. ( ) f max L S square model, 2 Two possible explanations 1) Similarity condition for nucleation, but highfreq. asymptote is produced by stopping phase associated with abrupt rupture arrest (which produces 1 decay) 2) !Similar ity condi tion (notsimil ar i ty). The events wer e di ffer ent fr om the point of nucl eation. f ma x for the lar ge event i s lar ger than that for the smal l event. Hanks (1979)...
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This note was uploaded on 07/23/2008 for the course GEOSC 508 taught by Professor Marone during the Spring '07 term at Pennsylvania State University, University Park.
 Spring '07
 MARONE

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