Mécanismes des failles des séismes des 17 et 21 juin 2000 dans la Zone sismique sud-islandaise, d'après les traces de surface des failles d'Árnes et de l'Hestfjall

Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science Pub Date : 2001-07-15 DOI:10.1016/S1251-8050(01)01581-6

Françoise Bergerat, Jacques Angelier

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引用次数: 13

Abstract

Two major earthquakes (M_s=6.6) occurred on 17 and 21 June 2000 in the South Iceland Seismic Zone. This paper presents characteristic examples of surface traces of these seismic faults, called the Árnes and Hestfjall faults. The surface trace of the Árnes fault at Mykjunes shows a conjugate strike-slip pattern with a N30°E trending right-lateral fault and a N60°E trending left-lateral fault. Each of these faults is formed by ‘en-échelon’ arrays of fractures and push-ups. The surface trace of the Hestfjall fault near Bitra reveals a N50°–60°E trending left-lateral strike-slip fault including large open fractures, ‘en-échelon’ fractures and some push-ups. These observations show that the actual earthquake-related fault pattern is not restricted to the north–south-trending dextral strike-slip revealed by focal mechanisms and north–south alignment of aftershocks, but includes conjugate systems consistent with the structural pattern of the SISZ.

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机制的地震断层的地震区的17日和2000年6月21日sud-islandaise表面痕迹显示断层Á场就交通和l’Hestfjall

2000年6月17日和21日，南冰岛地震带发生了两次大地震(6.6级)。本文介绍了这些地震断层(Árnes和Hestfjall断层)的地表轨迹的典型例子。Mykjunes Árnes断裂的地表迹线表现为N30°E向的右侧断裂和N60°E向的左侧断裂的共轭走滑模式。这些断层中的每一个都是由“en- cheron”的断裂和俯卧撑阵列形成的。Bitra附近的Hestfjall断层的地表迹线显示为一条N50°~ 60°E走向的左旋走滑断层，包括大型张开裂缝、“en- samchelon”裂缝和一些俯卧。这些观测结果表明，实际的地震相关断层模式并不局限于震源机制揭示的南北向右走滑和余震的南北向走向，而是包括与四川断裂带构造模式相一致的共轭系统。

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Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science

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