Abstract

Seismic Zone from the surface traces of the Arnes and Hestfjall faults. 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 Arnes and Hestfjall faults. The surface trace of the Arnes 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-echelon' 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-echelon' 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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