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Structural and stress heterogeneities along the 1997 Zirkuh earthquake fault, Eastern Iran
Abstract The Abiz fault is the longest surface rupture in Iran, which constructed the northeastern boundary of the Lut Block in Eastern Iran. The relationship between geometrical complexities and the stress heterogeneities along the segmented and curved Abiz fault has been examined to get insight into the cause of deflection of the fault segments and also the degree of fault maturity. The northern half of the Abiz fault rupture, based on the position of the splay fault, the surface and the depth slip variations, the width of step-overs, the ground motion and damages, and the aftershock concentration, has more maturity than the southern half. The Abiz fault has nine step-overs along the length (i.e., four releasing step-overs and five restraining step-overs) in which from the north of Ardekul toward the south, with the decrease in the degree of maturity, the width of the step-overs and the size of overlaps are larger than those in the northern segments. The Abiz fault has been divided into seven segments based on the step-overs, bends, the previous earthquake ruptures, the slip deficits, and the dip direction deviation. These segments have become favorably oriented with respect to the stress field. The stress heterogeneities along the fault segments represent the local stress pattern around the curved slip surfaces. It is expected that this pattern would be compatible with the stress orientations due to the aftershock focal mechanism inversion.
Structural and stress heterogeneities along the 1997 Zirkuh earthquake fault, Eastern Iran
Abstract The Abiz fault is the longest surface rupture in Iran, which constructed the northeastern boundary of the Lut Block in Eastern Iran. The relationship between geometrical complexities and the stress heterogeneities along the segmented and curved Abiz fault has been examined to get insight into the cause of deflection of the fault segments and also the degree of fault maturity. The northern half of the Abiz fault rupture, based on the position of the splay fault, the surface and the depth slip variations, the width of step-overs, the ground motion and damages, and the aftershock concentration, has more maturity than the southern half. The Abiz fault has nine step-overs along the length (i.e., four releasing step-overs and five restraining step-overs) in which from the north of Ardekul toward the south, with the decrease in the degree of maturity, the width of the step-overs and the size of overlaps are larger than those in the northern segments. The Abiz fault has been divided into seven segments based on the step-overs, bends, the previous earthquake ruptures, the slip deficits, and the dip direction deviation. These segments have become favorably oriented with respect to the stress field. The stress heterogeneities along the fault segments represent the local stress pattern around the curved slip surfaces. It is expected that this pattern would be compatible with the stress orientations due to the aftershock focal mechanism inversion.
Structural and stress heterogeneities along the 1997 Zirkuh earthquake fault, Eastern Iran
Ansari, Shoja (author)
2021
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
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