Seismic amplification at Avcılar, Istanbul

Tezcan, Semih S.; Kaya, Erdem; Bal, İhsan Engin; Özdemir, Zuhal

doi:10.1016/s0141-0296(02)00002-0

Cited by 49 publications

(31 citation statements)

References 5 publications

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“…Site KUM (Kumköy) is north of the city at the Black Sea coast and is included for investigating the effect of distance on the spectra. Sites SIT (Avcilar) and ATA (Ataköy) are located in areas known to be affected by local site effects (Tezcan et al, 2002;Sørensen et al, 2006). The remaining two sites, HIS and BUS, are located in the historical center (Sultanahmet) and the business center (Levent), respectively.…”

Section: Frequency Distribution Of Ground Motion and Implications Formentioning

confidence: 99%

Sensitivity of Ground-Motion Simulations to Earthquake Source Parameters: A Case Study for Istanbul, Turkey

Sørensen¹,

Pulido²,

Atakan³

2007

Bulletin of the Seismological Society of America

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Section: Frequency Distribution Of Ground Motion and Implications Formentioning

confidence: 99%

Sensitivity of Ground-Motion Simulations to Earthquake Source Parameters: A Case Study for Istanbul, Turkey

Sørensen¹,

Pulido²,

Atakan³

2007

Bulletin of the Seismological Society of America

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“…The maximum ground acceleration that was measured on soft sediments was 0.25 g, which is six times higher than the peak ground acceleration recorded on the bedrock in the center of Istanbul [40]. This difference is the result of the amplification of seismic waves in surficial layers with soft lithology [40,[42][43][44][45][46]. Despite a low background seismicity, which suggested no active faulting in the region [47], destructive and widespread damage during the 1999 Izmit earthquake drew considerable attention on this area, requiring the reassessment of active faulting.…”

Section: Study Area 1: Haramidere Valley and Avcilar Neighborhoodmentioning

confidence: 56%

“…During this earthquake, 27 buildings collapsed, 2076 other buildings were heavily damaged, and 273 casualties were reported in Avcilar [41,42]. The maximum ground acceleration that was measured on soft sediments was 0.25 g, which is six times higher than the peak ground acceleration recorded on the bedrock in the center of Istanbul [40]. This difference is the result of the amplification of seismic waves in surficial layers with soft lithology [40,[42][43][44][45][46].…”

Section: Study Area 1: Haramidere Valley and Avcilar Neighborhoodmentioning

confidence: 99%

“…It is located about 15 km north of the NAF, which cuts across the Sea of Marmara (Figure 2). Although the Avcilar district is located at a distance of 120 km west of the epicenter of the 17 August 1999 Izmit earthquake, it was the only area in the Istanbul metropolitan region that suffered extensive damage [40]. During this earthquake, 27 buildings collapsed, 2076 other buildings were heavily damaged, and 273 casualties were reported in Avcilar [41,42].…”

Section: Study Area 1: Haramidere Valley and Avcilar Neighborhoodmentioning

confidence: 99%

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Analysis of Secular Ground Motions in Istanbul from a Long-Term InSAR Time-Series (1992–2017)

et al. 2018

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Abstract:The identification and measurement of ground deformations in urban areas is of great importance for determining the vulnerable parts of the cities that are prone to geohazards, which is a crucial element of both sustainable urban planning and hazard mitigation. Interferometric synthetic aperture radar (InSAR) time series analysis is a very powerful tool for the operational mapping of ground deformation related to urban subsidence and landslide phenomena. With an analysis spanning almost 25 years of satellite radar observations, we compute an InSAR time series of data from multiple satellites (European Remote Sensing satellites ERS-1 and ERS-2, Envisat, Sentinel-1A, and its twin sensor Sentinel-1B) in order to investigate the spatial extent and rate of ground deformation in the megacity of Istanbul. By combining the various multi-track InSAR datasets (291 images in total) and analysing persistent scatterers (PS-InSAR), we present mean velocity maps of ground surface displacement in selected areas of Istanbul. We identify several sites along the terrestrial and coastal regions of Istanbul that underwent vertical ground subsidence at varying rates, from 5 ± 1.2 mm/yr to 15 ± 2.1 mm/yr. The results reveal that the most distinctive subsidence patterns are associated with both anthropogenic factors and relatively weak lithologies along the Haramirede valley in particular, where the observed subsidence is up to 10 ± 2 mm/yr. We show that subsidence has been occurring along the Ayamama river stream at a rate of up to 10 ± 1.8 mm/yr since 1992, and has also been slowing down over time following the restoration of the river and stream system. We also identify subsidence at a rate of 8 ± 1.2 mm/yr along the coastal region of Istanbul, which we associate with land reclamation, as well as a very localised subsidence at a rate of 15 ± 2.3 mm/yr starting in 2016 around one of the highest skyscrapers of Istanbul, which was built in 2010.

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“…During many of the past earthquakes (Kachh, 1819, Mexico City, 1985, Loma Prieta, 1989, Chi Chi, 1999, Kobe, 1995 it has been observed that damages occurred to buildings located at soil sites are more compared to damages observed on buildings located at rock sites as reported in literature [1][2][3][4][5][6]. Figure 1 shows the ground motions recorded at two adjacent sites viz., a rock site (UNAM) and a soil site (SCT) located 350 km away from epicenter during 1985 Mexico city earthquake.…”

Section: Introductionmentioning

confidence: 99%

Modelling Propagation of Stress Waves through Soil Medium for Ground Response Analysis

Kamatchi¹,

Ramana²,

Nagpal³

et al. 2013

ENG

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During past earthquakes, damages occurred to buildings located at soil sites are more compared to damages observed on buildings located at rock sites. Modelling wave propagation through soil medium helps to derive the primary and secondary wave velocities. Most of the time soil mediums are heterogeneous, layered and undergoes nonlinear strains even under weak excitation. The equivalent linear approximation with one dimensional wave propagation is widely adopted for modeling earthquake excitation for layered soil. In this paper, importance of local soil effects, the process of wave propagation through three dimensional elastic medium, layered medium situated on rigid rock, attenuation of stress waves due to material damping, equivalent linear approximation, the concept of one dimensional wave propagation, and a case study of one dimensional wave propagation as a part of site-specific ground response analyses for Delhi region are included. The case study brings out the importance of carrying out site-specific ground response analyses of buildings considering the scenario earthquakes and actual soil conditions for Delhi region.

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Seismic amplification at Avcılar, Istanbul

Cited by 49 publications

References 5 publications

Sensitivity of Ground-Motion Simulations to Earthquake Source Parameters: A Case Study for Istanbul, Turkey

Sensitivity of Ground-Motion Simulations to Earthquake Source Parameters: A Case Study for Istanbul, Turkey

Analysis of Secular Ground Motions in Istanbul from a Long-Term InSAR Time-Series (1992–2017)

Modelling Propagation of Stress Waves through Soil Medium for Ground Response Analysis

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