Segmented seismicity of the Mw 6.2 Baladeh earthquake sequence (Alborz mountains, Iran) revealed from regional moment tensors

Publication: Research - peer-reviewJournal article – Annual report year: 2013

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Segmented seismicity of the Mw 6.2 Baladeh earthquake sequence (Alborz mountains, Iran) revealed from regional moment tensors. / Donner, Stefanie; Rössler, Dirk; Krüger, Frank; Ghods, Abdolreza; Strecker, Manfred R.

In: Journal of Seismology, Vol. 17, No. 3, 2013, p. 925-959.

Publication: Research - peer-reviewJournal article – Annual report year: 2013

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Donner, Stefanie; Rössler, Dirk; Krüger, Frank; Ghods, Abdolreza; Strecker, Manfred R. / Segmented seismicity of the Mw 6.2 Baladeh earthquake sequence (Alborz mountains, Iran) revealed from regional moment tensors.

In: Journal of Seismology, Vol. 17, No. 3, 2013, p. 925-959.

Publication: Research - peer-reviewJournal article – Annual report year: 2013

Bibtex

@article{317dff17386745318b09ab1e0b820a18,
title = "Segmented seismicity of the Mw 6.2 Baladeh earthquake sequence (Alborz mountains, Iran) revealed from regional moment tensors",
publisher = "Springer Netherlands",
author = "Stefanie Donner and Dirk Rössler and Frank Krüger and Abdolreza Ghods and Strecker, {Manfred R.}",
year = "2013",
doi = "10.1007/s10950-013-9362-7",
volume = "17",
number = "3",
pages = "925--959",
journal = "Journal of Seismology",
issn = "1383-4649",

}

RIS

TY - JOUR

T1 - Segmented seismicity of the Mw 6.2 Baladeh earthquake sequence (Alborz mountains, Iran) revealed from regional moment tensors

A1 - Donner,Stefanie

A1 - Rössler,Dirk

A1 - Krüger,Frank

A1 - Ghods,Abdolreza

A1 - Strecker,Manfred R.

AU - Donner,Stefanie

AU - Rössler,Dirk

AU - Krüger,Frank

AU - Ghods,Abdolreza

AU - Strecker,Manfred R.

PB - Springer Netherlands

PY - 2013

Y1 - 2013

N2 - The M w 6.2 Baladeh earthquake occurred on 28 May 2004 in the Alborz Mountains, northern Iran. This earthquake was the first strong shock in this intracontinental orogen for which digital regional broadband data are available. The Baladeh event provides a rare opportunity to study fault geometry and ongoing deformation processes using modern seismological methods. A joint inversion for hypocentres and a velocity model plus a surface-wave group dispersion curve analysis were used to obtain an adapted velocity model, customised for mid- and long-period waveform modelling. Based on the new velocity model, regional waveform data of the mainshock and larger aftershocks (M w  ≥3.3) were inverted for moment tensors. For the Baladeh mainshock, this included inversion for kinematic parameters. All analysed earthquakes show dominant thrust mechanisms at depths between 14 and 26 km, with NW–SE striking fault planes. The mainshock ruptured a 28° south-dipping area of 24 × 21 km along a north-easterly direction. The rupture plane of the mainshock does not coincide with the aftershock distribution, neither in map view nor with respect to depth. The considered aftershocks form two main clusters. The eastern cluster is associated with the mainshock. The western cluster does not appear to be connected with the rupture plane of the mainshock but, instead, indicates a second activated fault plane dipping at 85° towards the north.

AB - The M w 6.2 Baladeh earthquake occurred on 28 May 2004 in the Alborz Mountains, northern Iran. This earthquake was the first strong shock in this intracontinental orogen for which digital regional broadband data are available. The Baladeh event provides a rare opportunity to study fault geometry and ongoing deformation processes using modern seismological methods. A joint inversion for hypocentres and a velocity model plus a surface-wave group dispersion curve analysis were used to obtain an adapted velocity model, customised for mid- and long-period waveform modelling. Based on the new velocity model, regional waveform data of the mainshock and larger aftershocks (M w  ≥3.3) were inverted for moment tensors. For the Baladeh mainshock, this included inversion for kinematic parameters. All analysed earthquakes show dominant thrust mechanisms at depths between 14 and 26 km, with NW–SE striking fault planes. The mainshock ruptured a 28° south-dipping area of 24 × 21 km along a north-easterly direction. The rupture plane of the mainshock does not coincide with the aftershock distribution, neither in map view nor with respect to depth. The considered aftershocks form two main clusters. The eastern cluster is associated with the mainshock. The western cluster does not appear to be connected with the rupture plane of the mainshock but, instead, indicates a second activated fault plane dipping at 85° towards the north.

KW - Alborz mountains

KW - Iran

KW - Baladeh earthquake

KW - Inversion for moment tensors

KW - Seismotectonics

U2 - 10.1007/s10950-013-9362-7

DO - 10.1007/s10950-013-9362-7

JO - Journal of Seismology

JF - Journal of Seismology

SN - 1383-4649

IS - 3

VL - 17

SP - 925

EP - 959

ER -