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Directivity analysis of the 2017 December Kerman earthquakes in Eastern Iran
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.ORCID iD: 0000-0002-0789-5949
(English)In: Journal of Seismology, ISSN 1383-4649, E-ISSN 1573-157XArticle in journal (Refereed) In press
Place, publisher, year, edition, pages
Springer.
Keywords [en]
triplet earthquake, directivity, Empirical Green's function, spectral deconvolution, restraining bend, Eastern Iran
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-407245DOI: 10.1007/s10950-020-09913-8OAI: oai:DiVA.org:uu-407245DiVA, id: diva2:1416105
Available from: 2020-03-21 Created: 2020-03-21 Last updated: 2020-03-21
In thesis
1. Source analysis of multiplet earthquakes (two case studies in Iran)
Open this publication in new window or tab >>Source analysis of multiplet earthquakes (two case studies in Iran)
2020 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Multiplet earthquakes are large earthquakes of similar magnitude which occur close in time in the same limited geographical area. They are not common but they considerably increase the potential hazard in the area in which they occur. This thesis studies source properties and triggering mechanisms of two sets of multiplet events in Iran, which both occurred in unexpected areas, but close to some major active fault systems. The first multiplet is an earthquake doublet (Mw 6.5 and Mw 6.4) which occurred in northwestern Iran and caused more than 300 fatalities and significant injuries. In paper I, a teleseismic body-waveform inversion was used to deduce the slip distribution pattern on the fault plane of the first mainshock. The estimated slip pattern was utilized to calculate the Coulomb stress changes on the second fault plane and on the following aftershocks. Based on this analysis, the ambiguity between the primary and auxiliary fault plane of the second mainshock could be resolved. The second set of events is a triplet (Mw 6.1 - 6.0) that occurred in eastern Iran, close to the Kerman province. In paper II, the rupture propagation patterns of the three mainshocks were analyzed using Empirical Green’s Function (EGF) deconvolution. Two different approaches were used: One, the analysis of the azimuthal variation of the apparent rupture duration based on the width of the observed relative source time functions, and the second, the analysis of along-strike rupture directivity by assessing azimuthal variations of the relative amplitude spectra. The second approach was also used to investigate the rupture directivity of the largest aftershocks in the sequence (Mw 5 - 5.5). A clear tendency for rupture propagation towards the northwest was observed for the sequence, which suggests that the regional stress field has a central role in controlling the rupture propagation direction. In paper III, the slip distribution patterns of the triplet earthquakes were analyzed using teleseismic body-waveform inversion, and the similarities and differences in the rupture processes of the three mainshocks were investigated. Using the Coulomb stress analyses, the stress interactions between the mainshocks were examined, leading to identification of the primary and auxiliary planes. Finally, we suggest that the hazard estimates in complex continental regions such as Iran need to consider the probability of multiplets, which might allow a reduction of the seismic risk associated to the occurrence of further large earthquakes subsequent to a devastating earthquake.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2020. p. 45
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1918
Keywords
Multiplet earthquakes, slip inversion, Coulomb stress, rupture directivity
National Category
Geophysics
Identifiers
urn:nbn:se:uu:diva-407247 (URN)978-91-513-0909-5 (ISBN)
Public defence
2020-06-12, Hambergsallen, Geocentrum, Villavägen 16, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2020-05-20 Created: 2020-03-21 Last updated: 2020-05-20

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Amini, SamarRoberts, RolandLund, Björn

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