Calibration of the specific barrier model to Iranian plateau earthquakes and development of physically based attenuation relationships for Iran

Zafarani, Hamid; Mousavi, Mehdi; Noorzad, Ali; Ansari, Anooshiravan

doi:10.1016/j.soildyn.2007.08.001

Cited by 34 publications

(27 citation statements)

References 46 publications

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“…For the best path model, the regression model returned stable estimates for Δσ L of about 116 bars, and Δσ G of about 39 bars. These parameters are close to the stress drops that were reported by Zafarani et al (2008) for Iran and different from the values estimated Table 4 summarizes the stochastic model and its related parameters, which are either chosen or obtained in the calibration of the SBM to the strong motion data of the Zagros region. The standard deviations of the interevent and intraevent terms are τ 0:10 and σ 0:31, respectively, and the total standard deviation is σ T 0:34.…”

Section: Regression Methods and Resultssupporting

confidence: 61%

“…8) and compared with the model suggested by Zafarani et al (2008) for the Iranian plateau. Also, in this figure the Brune's model (Brune, 1970(Brune, , 1971 for Δσ 70 and 150 bars suggested by Chen and Atkinson (2002) as the range of possible values for the worldwide events, and the source spectrum of the SBM model for northern Iran (Soghrat et al, 2012) are shown for comparison purposes.…”

Section: Regression Methods and Resultsmentioning

confidence: 99%

“…Also, in this figure the Brune's model (Brune, 1970(Brune, , 1971 for Δσ 70 and 150 bars suggested by Chen and Atkinson (2002) as the range of possible values for the worldwide events, and the source spectrum of the SBM model for northern Iran (Soghrat et al, 2012) are shown for comparison purposes. Table 6 presents the model parameters that were either selected or obtained in the calibration of the SBM to the strong motion data of the Zagros region (present study), northern Iran (Soghrat et al, 2012), and Iran as a whole (Zafarani et al, 2008). Chen and Atkinson (2002) have compared the apparent earthquake source radiations, by removing path and site properties, for six different regions: Japan, Mexico, Turkey, California, British Columbia (western Canada), and eastern North America.…”

Section: Regression Methods and Resultsmentioning

confidence: 99%

“…In order to compare parameters for the time and frequency domains, our attention is devoted to the PHA and PSA. Recently, physical and/or empirical spectral GMPEs have been developed for Iran (Zafarani et al, 2008;Ghasemi et al, 2009;Soghrat et al, 2012). These models can be used for comparison purposes.…”

Section: Comparison With Gmpesmentioning

confidence: 99%

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Simulation of Ground Motion in the Zagros Region of Iran Using the Specific Barrier Model and the Stochastic Method

Zafarani¹,

Soghrat²

2012

Bulletin of the Seismological Society of America

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Physically based ground-motion prediction equations for soil and rock sites in the Zagros region have been developed based on the specific barrier model (SBM) used within the context of the stochastic model. Instead of direct timedomain simulation, random vibration theory was used to estimate measures of peak motion in terms of the pseudospectral velocity of anelastic harmonic oscillator with 5% viscous damping. To avoid the uncertainties, calibration of the source model uses a database of carefully selected strong motion data without ambiguity about the site condition. Therefore, only rock sites are selected for determining source parameters. Also, to avoid any inconsistencies caused by magnitude conversion formulas, we restricted the dataset only to events with available moment magnitudes. Regression analysis is performed using the random effects model that considers both interevent and intraevent variabilities to effectively deal with the problem of an unequal number of records from different earthquakes. No sign of self-similarity breakdown is observed between the source radius and its seismic moment. The local and global stress drops derived for the Zagros region (39 and 116 bars, respectively) are more consistent with the values obtained by other authors for an interplate regime than the values for an intraplate region. However, from the viewpoint of source heterogeneity (as the ratio of the stress drops is an indicator of the complexity of the source and heterogeneity of slip on the fault) the Zagros events, which have a stress-drop ratio of about three are more homogeneous than other interplate events. Stochastic simulations are then implemented to predict peak ground motion and response spectra parameters for rock and soil site conditions.

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Section: Regression Methods and Resultssupporting

confidence: 61%

Section: Regression Methods and Resultsmentioning

confidence: 99%

Section: Regression Methods and Resultsmentioning

confidence: 99%

Section: Comparison With Gmpesmentioning

confidence: 99%

See 2 more Smart Citations

Simulation of Ground Motion in the Zagros Region of Iran Using the Specific Barrier Model and the Stochastic Method

Zafarani¹,

Soghrat²

2012

Bulletin of the Seismological Society of America

Self Cite

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“…b A schematic plot of the earthquake source spectra of the SBM for two magnitudes, M w 5.5 and 7.5, showing the loci of the first and second corner frequencies, and the effects of f max . Also shown are the dependencies of the spectral levels below and above the first and second corner frequencies, respectively, on stress drops and main source area A o Mousavi et al 2007;Zafarani et al 2008;Soghrat et al 2012). The SBM has been applied in hybrid simulation of earthquake ground motions over the frequency range of engineering interest in both the far-and near-fault region (Halldorsson et al 2007(Halldorsson et al , 2011Mavroeidis and Papageorgiou 2003).…”

Section: Introductionmentioning

confidence: 99%

Variations of the specific barrier model—part I: effect of subevent size distributions

Halldórsson

Παπαγεωργιου

2012

Bull Earthquake Eng

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The specific barrier model (SBM), introduced and developed by Papageorgiou and Aki (1983a;1983b;1985) and recently re-calibrated by Halldorsson and Papageorgiou (2005) for earthquakes of different tectonic regions, is a particular case of a composite seismic source model according to which the seismic moment is distributed in a deterministic manner on the fault plane on the basis of moment and area constraints. Namely, it assumes that a rectangular fault surface is filled with an aggregate of non-overlapping subevents modeled as circular cracks of equal diameter, the 'barrier interval', on which a 'local stress drop' takes place. In the present work, we relax the basic assumption regarding subevent size of the SBM. Subevents, still modeled as circular cracks, are allowed to vary in size according to various prescribed probability density functions controlling the frequency of occurrence of subevent sizes. Closed form expressions of the 'far-field' spectra of the composite source are derived using an approach proposed by Joyner and Boore (1986). The seismic energy radiated by individual subevents arrives at a site in a time window the duration of which is related to the duration of rupture and the source-site geometry. The effect of the distribution of 'arrival times' on the spectral amplitudes of the composite source is investigated in a companion paper, referred to as Part II. The type of subevent size distribution and its allowed size range directly affects the number of subevents required to satisfy the moment constraint. A larger number of subevents leads to increased 'complexity' of the earthquake which generally results in relatively higher source acceleration spectral levels at high-frequencies. The level of the plateau of the high-frequency acceleration spectral amplitudes, B. Halldorsson (B) corresponding to different size-distributions, does not differ significantly from that of the far-field spectrum of the SBM, for a constant local stress drop. Furthermore, the differences observed in the spectral amplitudes of the SBM and its variants are likely to be less than the expected uncertainty associated with local stress drop values determined from strongmotion data. Thus, despite its simplifying assumptions, the SBM appears to provide the most simple, yet effective, description that captures the essential characteristics of a composite seismic source. This is especially advantageous for consistent strong-motion modeling in the 'near-fault', as well as in the 'far-field' region for earthquake engineering applications.

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Ground Motion Data Profile of Western Turkey with Intelligent Hybrid Processing

Korkmaz

Demir

2016

Pure Appl. Geophys.

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Calibration of the specific barrier model to Iranian plateau earthquakes and development of physically based attenuation relationships for Iran

Cited by 34 publications

References 46 publications

Simulation of Ground Motion in the Zagros Region of Iran Using the Specific Barrier Model and the Stochastic Method

Simulation of Ground Motion in the Zagros Region of Iran Using the Specific Barrier Model and the Stochastic Method

Variations of the specific barrier model—part I: effect of subevent size distributions

Ground Motion Data Profile of Western Turkey with Intelligent Hybrid Processing

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