Engineering summary
Kalkan and Gulkan model six Istanbul earthquake scenarios with six GMPEs and site amplification, mapping PGA and spectral acceleration to show where shaking will be most intense.
In short: Seismic risk in Istanbul was assessed by Erol Kalkan and Polat Gulkan using six plausible earthquake scenarios and six ground motion prediction equations to build high-resolution hazard maps of peak horizontal ground acceleration and spectral acceleration, including amplification by soft sediments. Median 0.3 s spectral accelerations approach 1 g along the western shoreline, while the financial district sees about 0.3 g.
Erol Kalkan and Polat Gülkan
In our new paper, we dive deep into the seismic challenges facing Istanbul, a city at risk of a significant earthquake. Our comprehensive research employs a multi-faceted approach to evaluate seismic risks in this bustling metropolis. We examine six plausible earthquake scenarios, utilizing six distinct ground motion prediction equations (GMPEs) to create high-resolution seismic hazard maps.
These maps not only highlight peak horizontal ground accelerations but also provide insights into spectral acceleration values across various timeframes. We account for the amplification effects of softer sediments, resulting in a nuanced understanding of Istanbul’s seismic vulnerability.
Our findings spotlight areas of heightened risk, such as the western shoreline, where median spectral accelerations at 0.3 seconds approach 1 g, indicating the potential for intense shaking. Conversely, the financial district exhibits lower values, approximately at 0.3 g. These granular insights are invaluable for strategic urban planning and risk mitigation efforts.
Our research serves as a rallying call for proactive measures aimed at minimizing earthquake impacts on Istanbul’s dynamic urban landscape. By enhancing our comprehension of seismic risks, we aim to contribute to the protection of the city’s residents and critical infrastructure.
For all your seismic hazard evaluation needs in Istanbul and its surroundings, reach out to us at sales@quakelogic.net.
Key Takeaways
- The study models six plausible earthquake scenarios for Istanbul with six distinct ground motion prediction equations (GMPEs).
- Maps give peak horizontal ground acceleration and spectral acceleration at multiple periods, including soft-sediment amplification.
- Western shoreline: median spectral acceleration at 0.3 s approaches 1 g, indicating potential for intense shaking.
- Financial district: spectral acceleration at 0.3 s is about 0.3 g, markedly lower.
- Results are intended for urban planning, risk mitigation and protection of residents and critical infrastructure.
Frequently Asked Questions
According to the hazard mapping by Kalkan and Gulkan, Istanbul's western shoreline faces the highest shaking, with median spectral accelerations at 0.3 s approaching 1 g across the modeled scenarios. The financial district shows much lower values, around 0.3 g at the same period. These differences reflect distance to the fault scenarios and amplification by softer sediments.
The Istanbul seismic hazard maps were produced by combining six plausible earthquake scenarios with six different ground motion prediction equations, then computing peak horizontal ground acceleration and spectral acceleration at several periods on a high-resolution grid. Site amplification from softer sediments was included so the maps reflect local soil conditions rather than rock motion alone.
A ground motion prediction equation is an empirical model that estimates shaking intensity measures such as peak ground acceleration or spectral acceleration from earthquake magnitude, source-to-site distance, fault mechanism and site conditions. Using six GMPEs in the Istanbul study captures model-to-model uncertainty and gives more robust median hazard estimates than relying on a single equation.
Spectral acceleration at 0.3 seconds corresponds to the fundamental period of short, stiff buildings of a few stories, which make up much of Istanbul's housing stock. Values approaching 1 g on the western shoreline indicate demands that can severely damage such structures, which is why the study highlights these areas for strategic planning and risk mitigation.
The high-resolution maps show where peak ground and spectral accelerations are expected to be highest, letting planners prioritize retrofit programs, emergency response resources and land-use decisions in the most exposed districts. QuakeLogic offers seismic hazard evaluation services for Istanbul and surrounding areas based on this type of scenario analysis.
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Topic cluster
Related engineering knowledge areas
- Earthquake EngineeringSeismic hazard, ground motion, structural response, fragility, and resilience guidance.
- Structural Health MonitoringMonitoring for bridges, buildings, dams, tunnels, industrial facilities, and resilient infrastructure.
- Earthquake Early WarningOn-site detection, alerting workflows, seismic switches, and critical infrastructure warning systems.
- Infrasound MonitoringLow-frequency acoustic sensing for environmental noise, blast, UAV, volcano, and defense applications.
Definitions and references
Terms, standards, and source cues
- seismic hazard: related to Earthquake Engineering in this QuakeLogic knowledge cluster.
- ground motion: related to Earthquake Engineering in this QuakeLogic knowledge cluster.
- SHM: related to Structural Health Monitoring in this QuakeLogic knowledge cluster.
- damage detection: related to Structural Health Monitoring in this QuakeLogic knowledge cluster.
- earthquake early warning: related to Earthquake Early Warning in this QuakeLogic knowledge cluster.
- seismic switch: related to Earthquake Early Warning in this QuakeLogic knowledge cluster.
- infrasound sensors: related to Infrasound Monitoring in this QuakeLogic knowledge cluster.
- low-frequency noise: related to Infrasound Monitoring in this QuakeLogic knowledge cluster.
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