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Information Journal Paper

Title

Investigation of causative fault of Bam (2003) earthquake using joint inversion of InSAR and strong ground motion data

Pages

  75-89

Keywords

Bam earthquake (2003) 

Abstract

 Summary The Source parameters of Bam (2003) earthquake such as the unjustifiability of the released seismic moment in this fault with magnitude relation, the mismatch for post-seismic fault and InSAR faults, not convincing tectonic regime with reported faults and seeing two extreme peaks on accelerometers need to be investigated. As there are ambiguities and sometimes inconsistencies in the reports about these Source parameters, we have decided to estimate the Source parameters of the causative faults of Bam earthquake using Joint inversion of InSAR and strong ground motion data. Static displacement obtained from strong ground motion data has a complementary role for areas covered by vegetation. Our results show two faults that are responsible for breakdowns in Bam city. One of these faults has transferred stress to another one that reaches to surface. The second fault is a right-lateral strike-slip fault with strike 358° , dip 84° and rake 178° to the east that has maximum moment release with 2. 49 m slip. The first fault is laid beneath the second fault with strike 172° and dip 45° to west. The Stress transfer pattern of the first fault on the second one is comparable with slip distribution on the second fault. Using forward modeling of strong ground motion data and fixing parameters obtained from Joint inversion of InSAR and strong ground motion data, the epicenter of the earthquake is 58. 27° and 29. 05° . Thus, in this study, the exact fault parameters for the Bam earthquake have been determined using Joint inversion of InSAR and strong ground motion data, and it is tried to show that the tectonic of this region is related to this fault. Introduction The study of recognition of causative faults of earthquakes and prediction of the physics of these earthquakes is a favorite topic of earth science researchers. The parameters of an earthquake causative fault could demonstrate attributes of tectonic plates and provide critical information about the earthquake hazard assessment. Methodology and Approaches In the first step, we need to determine the fault displacement obtained from InSAR and strong ground motion data. This displacement could be measured using the observations of radar satellites via the synthetic aaperture radar interferometry method. This method can be used to map the deformations created on the ground by earthquakes (Okada, 1985). Using SARS cape software, the displacement is extracted from interferograms that are obtained from InSAR data. To obtain the displacement from strong ground motion data, the BASCO code is used to extract static displacement from acceleration data. To find the parameters of causative fault as analytical models, the Joint inversion processing is aimed such that to minimize the difference between the observed and predicted data in a least-squares sense. The non-linear inversion is based on the Levenberg-Marquardt (Marquardt, 1963) minimization algorithm. It has multiple restarts to reasonably guarantee the convergence of the cost Function to the global minimum. Finally, the synthetic accelerations are created with finite fault model to demonstrate the best fit between the observed and synthetic accelerograms at stations. Results and Conclusions The results of this study show that two faults are responsible for breakdowns in Bam city. One of these faults has transferred stress to another one that reaches to surface. The second fault is a right-lateral strike-slip fault with strike 358° , dip 84° and rake 178° to the east that has maximum moment release with 2. 49 m slip. The first fault is laid beneath the second fault with strike 172° and dip 45° to west. The Stress transfer pattern of the first fault on the second one is comparable with slip distribution on the second fault. Using forward modeling of strong ground motion data and fixing parameters obtained from Joint inversion of InSAR and strong ground motion data, the estimated epicenter of the earthquake is determined to be 58. 27° and 29. 05° .

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    APA: Copy

    Golshadi, Zeinab, REZAPOUR, MAHDI, & AMIGHPEY, MASOOME. (2020). Investigation of causative fault of Bam (2003) earthquake using joint inversion of InSAR and strong ground motion data. JOURNAL OF RESEARCH ON APPLIED GEOPHYSICS, 6(1 ), 75-89. SID. https://sid.ir/paper/268587/en

    Vancouver: Copy

    Golshadi Zeinab, REZAPOUR MAHDI, AMIGHPEY MASOOME. Investigation of causative fault of Bam (2003) earthquake using joint inversion of InSAR and strong ground motion data. JOURNAL OF RESEARCH ON APPLIED GEOPHYSICS[Internet]. 2020;6(1 ):75-89. Available from: https://sid.ir/paper/268587/en

    IEEE: Copy

    Zeinab Golshadi, MAHDI REZAPOUR, and MASOOME AMIGHPEY, “Investigation of causative fault of Bam (2003) earthquake using joint inversion of InSAR and strong ground motion data,” JOURNAL OF RESEARCH ON APPLIED GEOPHYSICS, vol. 6, no. 1 , pp. 75–89, 2020, [Online]. Available: https://sid.ir/paper/268587/en

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