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Relation between tectonic stress, great earthquakes and earthquake swarms

Kanamori, Hiroo (1972) Relation between tectonic stress, great earthquakes and earthquake swarms. Tectonophysics, 14 (1). pp. 1-12. ISSN 0040-1951. http://resolver.caltech.edu/CaltechAUTHORS:20150218-084255929

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Abstract

Along the northern boundary of the Philippine Sea plate are a remarkable earthquake swarm area and several epicenters of great earthquakes which occurred in the past. The temporal variation of the swarm activity shows a remarkable relation to the occurrence of great earthquakes: the swarm activity falls off when a great earthquake occurs at the boundary between the Philippine Sea plate and the continental block that includes the swarm area, but it rises when a great earthquake occurs at a boundary between the Philippine Sea plate and one of the other continental blocks. On the basis of the detailed mechanism studies on these great earthquakes, a simple model is constructed to explain this relation between the swarm earthquake and the great earthquakes. In this model, several independent crustal blocks are opposing the motion of the Philippine Sea plate; each block is stressed by the motion of the Philippine Sea plate through a friction-coupled interface where great earthquakes are supposed to occur. When a great earthquake occurs at the boundary between the plate and the crustal block that includes the swarm area, the stress in this block is released and the swarm activity falls off. On the contrary, the stress in this block increases when a great earthquake occurs, as a rebound, at the boundary between the Philippine Sea plate and one of the other crustal blocks, because such rebound removes the force opposing the motion of the Philippine Sea plate, propels its motion, and therefore increases the stress in the block that includes the swarm area. Since the rise of the activity is found to precede the earthquake, probably because of some premonitory creep-like deformation at depths, a practical means for predicting an impending great earthquake in this region may be provided by monitoring the swarm activity.


Item Type:Article
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http://dx.doi.org/10.1016/0040-1951(72)90002-9DOIArticle
http://www.sciencedirect.com/science/article/pii/0040195172900029PublisherArticle
Additional Information:© 1972 Published by Elsevier B.V. Received 5 November 1971, Available online 14 April 2003. I greatly benefited from conversations with Kazuaki Nakamura, Kenshiro Tsumura, Tokihiko Matsuda, Seiya Uyeda, and Katzuyuki Abe to whom I express my hearty thanks. Assistance by Miss Tatoko Hirasawa throughout this study is also gratefully acknowledged.
Record Number:CaltechAUTHORS:20150218-084255929
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150218-084255929
Official Citation:Hiroo Kanamori, Relation between tectonic stress, great earthquakes and earthquake swarms, Tectonophysics, Volume 14, Issue 1, May 1972, Pages 1-12, ISSN 0040-1951, http://dx.doi.org/10.1016/0040-1951(72)90002-9. (http://www.sciencedirect.com/science/article/pii/0040195172900029)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54927
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:18 Feb 2015 16:57
Last Modified:13 Feb 2019 18:06

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