Geologic Deductions from Earthquakes of Deep Focus

From the maze of geophysical data little concrete evidence emerges to permit widely acceptable views on the strength of rocks at different depths in the earth's interior. Seismologists have established the existence of a high degree of rigidity down to great depths, but the commonly held view t...

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Bibliographic Details
Published in:The Journal of geology 1935-10, Vol.43 (7), p.759-764
Main Author: De Lury, J. S.
Format: Article
Language:English
Subjects:
Earthquakes
Geology
Isostasy
Proportional limit
Rocks
Seismology
Society of Jesus
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Summary:From the maze of geophysical data little concrete evidence emerges to permit widely acceptable views on the strength of rocks at different depths in the earth's interior. Seismologists have established the existence of a high degree of rigidity down to great depths, but the commonly held view that earthquakes are of shallow origin has lent support to the opinion that correspondingly shallow rocks alone can permit the slow accumulation of elastic stresses. This opinion must change with the growing evidence that earthquakes probably originate in all levels down to depths of 700 or more kilometers. The same evidence is disturbing to the assumptions of isostasy and to those hypotheses which rest on the concept of a shell of weakness.
ISSN:0022-1376
1537-5269
DOI:10.1086/624366