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Worldwide doublets of large shallow earthquakes

Y. Y. Kagan and D. D. Jackson
Worldwide doublets of large shallow earthquakes
Bulletin of the Seismological Society of America (October 1999) 89 (5): 1147-1155


We investigated all the pairs of M (sub w) > or =7.5 shallow earthquakes in the Harvard catalog that occurred at a centroid distance of less than 100 km. We showed that most of these pairs have similar focal mechanisms. Because these earthquakes generally should have focal regions in excess of 100 km diameter, their rupture zones apparently intersect. For all these pairs, the time interval is significantly less than the time span needed for plate motion to accumulate the strain released by the first event. These observations conflict strongly with quasi-periodic recurrence models on which the seismic gap hypothesis is based. Power-law recurrence fits these earthquake observations much better.

ISSN: 0037-1106
EISSN: 1943-3573
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 89
Serial Issue: 5
Title: Worldwide doublets of large shallow earthquakes
Affiliation: University of California at Los Angeles, Department of Earth and Space Sciences, Los Angeles, CA, United States
Pages: 1147-1155
Published: 199910
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 46
Accession Number: 2000-009742
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sketch map
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200004
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