Mechanisms of the faults of 17 and 21 June 2000 earthquakes in the South Iceland Seismic Zone from the surface traces of the Arnes and Hestfjall faults

被引：15

作者：

Bergerat, F ^{[1
]}

Angelier, J ^{[1
]}

机构：

[1] UPMC, Lab Tecton, CNRS, ESA 7072, F-75252 Paris 05, France

来源：

COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE A-SCIENCES DE LA TERRE ET DES PLANETES | 2001年 / 333卷 / 01期

关键词：

earthquake; strike-slip faults; 'en-echelon' fractures; push-up;

D O I：

10.1016/S1251-8050(01)01581-6

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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 Ames and Hestfjall faults. The surface trace of the Arnes fault at Mykjunes shows a conjugate strike-slip pattern with a N30 degreesE trending right-lateral fault and a N60 degreesE 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 degrees -60 degreesE 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. (C) 2001 Academie des sciences/Editions scientifiques et medicales Elsevier SAS.

引用

页码：35 / 44

页数：10

共 22 条

[1]

[Anonymous], OFIOLITI

[2] Secondary earthquake fractures generated by a strike-slip fault in the South Iceland Seismic Zone [J].

Belardinelli, ME ;

Bonafede, M ;

Gudmundsson, A .

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2000, 105 (B6) :13613-13629

[3] Seismotectonics of the central part of the South Iceland Seismic Zone [J].

Bergerat, F ;

Gudmundsson, A ;

Angelier, J ;

Rögnvaldsson, ST .

TECTONOPHYSICS, 1998, 298 (04) :319-335

[4] Tectonic stress regimes, rift extension and transform motion: the South Iceland Seismic Zone [J].

Bergerat, F ;

Angelier, J ;

Verrier, S .

GEODINAMICA ACTA, 1999, 12 (05) :303-319

[5] Fault and stress patterns at different stages of development of oceanic transform zones: the South Iceland seismic zone and the Tjornes fracture zone (Iceland) as case example [J].

Bergerat, F ;

Angelier, J .

COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE A-SCIENCES DE LA TERRE ET DES PLANETES, 1999, 329 (09) :653-659

[6] The South Iceland Seismic Zone: tectonic and sismotectonic analyses revealing the evolution from rifting to transform motion [J].

Bergerat, F ;

Angelier, J .

JOURNAL OF GEODYNAMICS, 2000, 29 (3-5) :211-231

[7]

BERGERAT F, UNPUB J STRUCT GEOL

[8]

BJARNASON IT, 1993, B SEISMOL SOC AM, V83, P416

[9]

Boovarsson R., 1996, Seismol. Res. Lett., V67, P35, DOI [10.1785/gssrl.67.5.35, DOI 10.1785/GSSRL.67.5.35]

[10] CURRENT PLATE MOTIONS [J].

DEMETS, C ;

GORDON, RG ;

ARGUS, DF ;

STEIN, S .

GEOPHYSICAL JOURNAL INTERNATIONAL, 1990, 101 (02) :425-478

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