Slab stress field in the Hellenic subduction zone as inferred from intermediate-depth earthquakes

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Title:	Slab stress field in the Hellenic subduction zone as inferred from intermediate-depth earthquakes
Authors:	Rontogianni,S;Konstantinou,KI;Melis,NS;Evangelidis,CP
Contributors:	地球物理研究所
Keywords:	FOCAL MECHANISMS;TRAVEL-TIMES;ARC;PLATE;DEFORMATION;INVERSION;GEOMETRY;DATABASE;REGION;JAPAN
Date:	2011
Issue Date:	2012-03-27 17:37:24 (UTC+8)
Publisher:	國立中央大學
Abstract:	The stress regime across the Hellenic subduction zone was investigated by performing stress inversion on 100 intermediate-depth moment tensor solutions. In this study, the slab was divided into four sectors based on earthquake distribution, trench geometry, and the results of a previous study of slab geometry. For the Peloponnese sector, moment tensors reaching 80 km depth were inverted, and the slab stresses were compatible with a possible slab tear. For the Kithira-Western Crete and Crete sectors, homogeneity was observed at depths up to 100 and 80 km, respectively. For these two areas, the subvertical sigma(3) and along-strike sigma(1) justify slab rollback as the driving mechanism. The differences in the stress regime and azimuth of the maximum compression of these two sectors may reflect a bulge in the slab. For the fourth sector, Karpathos-Rhodes, two distinct subsectors were defined along a depth gradient (50-90 km and 90-180 km, respectively). The strong heterogeneity observed at both depths and changes in the stress regime from slab pull to extension may be an indication of a double Wadati-Benioff zone. The membrane strain model presented here can provide a possible explanation for the along-strike compression observed at the top 90 km in three of the four sectors.
Relation:	EARTH PLANETS AND SPACE
Appears in Collections:	[Graduate Institute of Geophysics] journal & Dissertation

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