The Moderate Size September 2019 Mw5.8 Silivri Earthquake Unveils the Complexity ofthe Main Marmara Fault Shear Zone

Karabulut, Hayrullah; Güvercin, Sezim Ezgi; Eskiköy, Figen; Konca, A. O.; Ergintav, Semih

doi:10.1002/essoar.10504447.1

Cited by 3 publications

(5 citation statements)

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“…Starting from the source, we defined the slip distribution as per the model proposed by Karabulut et al [10] (Figure 2). The rectangular fault plane, which is 8 km long and 5.5 km wide, is divided into 10 subfaults along the strike and 11 subfaults along the dip directions.…”

Section: Model Parameters and Sensitivity Of Results To Parameter Valuesmentioning

confidence: 99%

“…The 26 September 2019 earthquake took place offshore Silivri, Istanbul (Figure 1). Main source parameters are reported by various sources as KOERI (http://www.koeri.boun.edu.tr/sismo/2/26-eylul-2019-silivri-aciklari-istanbulmarmara-denizi-depremi/), AFAD (https://deprem.afad.gov.tr/depremdokumanlari/1822?lang=en), Harvard CMT (https://www.globalcmt.org), EMSC (https://www.emsc-csem.org/Earthquake/earthquake.php?id=794756), USGS (https://earthquake.usgs.gov/earthquakes/eventpage/us70005lkl/origin/detail) and Karabulut et al [10] in Table 1. Estimations for Mw varied between 5.6 and 5.8.…”

Section: The Earthquakementioning

confidence: 99%

“…The focal mechanism was given as dominantly thrust faulting by seismological agencies. More recently, based on a re-analysis of main and aftershock data, Karabulut et al [10] have suggested that the event did not take place directly on the Central Marmara segment but was associated with a 60 𝑜 north dipping fault slightly to the north of the main segment. The causative strand was an oblique strike-slip fault and had a strike-slip displacement with some thrust component (rake angle of 165º).…”

Section: The Earthquakementioning

confidence: 99%

“…The size of the model is 8 km x 6km, along the strike and dip directions, respectively. The source parameters as per Karabulut et al [10] can be seen in Table 1. The proposed slip model is shown in Figure 2.…”

Section: The Earthquakementioning

confidence: 99%

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Stochastic ground motion simulation of the 26 September 2019 Mw 5.8 Silivri (Istanbul) earthquake

Yenihayat,

Çaktı,

Şeşetyan

2023

Bull Earthquake Eng

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The aim of using simulation techniques to provide generated ground motion data is to extend our knowledge on the effect of earthquakes and understanding their physical properties. Moreover, to fill the seismic gaps in case of insufficient recorded data in any region, ground motion simulations are widely used for earthquake engineering and seismology purposes. High-frequency accelerations have incoherent behavior because of unpredictable irregularities and heterogeneities associated with faulting and wave prpopagation. Simulations of ground motions frequencies beyond >1 Hz can be represented with stochastic methods using simplified model representations of source, path and site effects. In this paper, stochastic simulations are performed for the recordings of the 26 September 2019 Silivri, Istanbul earthquake, using a finite fault simulation approach with a dynamic corner frequency. The main target is to create a valid synthetic model database with consistent source, path, and site parameters in the region that can be implemented in future simulation efforts. In calibration, we have used the recordings at 59 widely distributed stations in Istanbul located on different site conditions with epicentral distances ranging from 23 to 101 km. Four different frequency-dependent Q models were tested to obtain the best fit with the observations. By comparing generated ground motions to the observed ones, optimum source parameters and crustal characteristics were estimated. The calibrated model parameters have been obtained from the set of best-fit data with observed ground motion in frequency domain. Synthetic PGAs have been compared with the NGA-West2 Ground Motion Models (GMMs). Furthermore, spatial distributions of the ground motion intensity parameters were obtained and compared with available damage observations in Istanbul due to this earthquake. In conclusion, the results of the simulation were in good agreement with the recorded ones, both in time and frequency domains. The results indicate that the proposed stochastic model can be used to simulate ground motion distributions in Istanbul and beyond from past and future events in the region.

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Section: Model Parameters and Sensitivity Of Results To Parameter Valuesmentioning

confidence: 99%

Section: The Earthquakementioning

confidence: 99%

Section: The Earthquakementioning

confidence: 99%

Section: The Earthquakementioning

confidence: 99%

See 2 more Smart Citations

Stochastic ground motion simulation of the 26 September 2019 Mw 5.8 Silivri (Istanbul) earthquake

Yenihayat,

Çaktı,

Şeşetyan

2023

Bull Earthquake Eng

View full text Add to dashboard Cite

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“…Large and devastating earthquakes (Mw > 7.0) occurred between 1939 and 1944 in the eastern part and between 1957 and 1999 in the western part on the NAFZ. After the last two earthquakes (Gölcük Mw = 7.4 and Kaynaşlı Mw = 7.2) that occurred in the east of Marmara in 1999, the place where the stress is transferred was in the Marmara Sea and the Middle Marmara Depression [36,37]. Occasional small and medium-sized earthquakes in this area are observed as proof of this situation.…”

Section: Seismicity Of Marmara Regionmentioning

confidence: 87%

The Effect of Site-Specific Design Spectrum on Earthquake-Building Parameters: A Case Study from the Marmara Region (NW Turkey)

et al. 2020

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The Marmara Region (NW Turkey) has experienced significant earthquakes (M > 7.0) to date. A destructive earthquake is also expected in the region. To determine the effect of the specific design spectrum, eleven provinces located in the region were chosen according to the Turkey Earthquake Building Code updated in 2019. Additionally, the differences between the previous and updated regulations of the country were investigated. Peak Ground Acceleration (PGA) and Peak Ground Velocity (PGV) were obtained for each province by using earthquake ground motion levels with 2%, 10%, 50%, and 68% probability of exceedance in 50-year periods. The PGA values in the region range from 0.16 to 0.7 g for earthquakes with a return period of 475 years. For each province, a sample of a reinforced-concrete building having two different numbers of stories with the same ground and structural characteristics was chosen. Static adaptive pushover analyses were performed for the sample reinforced-concrete building using each province’s design spectrum. The variations in the earthquake and structural parameters were investigated according to different geographical locations. It was determined that the site-specific design spectrum significantly influences target displacements for performance-based assessments of buildings due to seismicity characteristics of the studied geographic location.

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Stochastic Ground Motion Simulation of the 26 September 2019 Mw 5.8 Silivri (Istanbul) Earthquake

Yenihayat

Çaktı

Şeşetyan

2023

Preprint

View full text Add to dashboard Cite

The aim of using simulation techniques to provide generated ground motion data is to extend our knowledge on the effect of earthquakes and understanding their physical properties. Moreover, to fill the seismic gaps in case of insufficient recorded data in any region, ground motion simulations are widely used for earthquake engineering and seismology purposes. High-frequency accelerations have incoherent behavior because of unpredictable irregularities and heterogeneities associated with faulting and wave prpopagation. Simulations of ground motions frequencies beyond > 1 Hz can be represented with stochastic methods using simplified model representations of source, path and site effects. In this paper, stochastic simulations are performed for the recordings of the 26 September 2019 Silivri, Istanbul earthquake, using a finite fault simulation approach with a dynamic corner frequency. The main target is to create a valid synthetic model database with consistent source, path, and site parameters in the region that can be implemented in future simulation efforts. In calibration, we have used the recordings at 59 widely distributed stations in Istanbul located on different site conditions with epicentral distances ranging from 23 to 101 km. Four different frequency-dependent Q models were tested to obtain the best fit with the observations. By comparing generated ground motions to the observed ones, optimum source parameters and crustal characteristics were estimated. The calibrated model parameters have been obtained from the set of best-fit data with observed ground motion in frequency domain. Synthetic PGAs have been compared with the NGA-West2 Ground Motion Models (GMMs). Furthermore, spatial distributions of the ground motion intensity parameters were obtained and compared with available damage observations in Istanbul due to this earthquake. In conclusion, the results of the simulation were in good agreement with the recorded ones, both in time and frequency domains. The results indicate that the proposed stochastic model can be used to simulate ground motion distributions in Istanbul and beyond from past and future events in the region.

show abstract

The Moderate Size September 2019 Mw5.8 Silivri Earthquake Unveils the Complexity ofthe Main Marmara Fault Shear Zone

Cited by 3 publications

References 0 publications

Stochastic ground motion simulation of the 26 September 2019 Mw 5.8 Silivri (Istanbul) earthquake

Stochastic ground motion simulation of the 26 September 2019 Mw 5.8 Silivri (Istanbul) earthquake

The Effect of Site-Specific Design Spectrum on Earthquake-Building Parameters: A Case Study from the Marmara Region (NW Turkey)

Stochastic Ground Motion Simulation of the 26 September 2019 Mw 5.8 Silivri (Istanbul) Earthquake

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