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| Titel |
Underlying mechanism of precursory activity from analysis of upward earthquake migration |
| VerfasserIn |
O. A. Molchanov |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 11, no. 1 ; Nr. 11, no. 1 (2011-01-11), S.135-143 |
| Datensatznummer |
250009043
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| Publikation (Nr.) |
 copernicus.org/nhess-11-135-2011.pdf |
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| Zusammenfassung |
| In this paper we analyse the upward earthquake hypocentral migration
in the ten known subduction zones and discuss a possible mechanism
of such migration. The total time of the migration appears to range
from 2.5 to 10 years. It leads to the estimation of the average
velocity Vz~ 60−300 km yr−1. It probably
corresponds to the movement of the forcing agent like stress or
deformation wave from depths of the upper mantle (600–700 km) to
the level of the lithosphere with subsequent initiation of fluid
migration inside the crust to trigger shallow earthquakes. Averaged
over all zones upward migration travel time is about 5 years
(< Vz > ≈120 km yr−1) that coincides
approximately with the period of characteristic temperature
variation (El Nino) and crustal seismic periodicity in the Pacific
region. These findings are helpful for the study of the seismic
precursors and analysis of earthquake triggering. |
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