Istanbul is one of the world's most seismically exposed major cities. A M7+ earthquake on the North Anatolian Fault is considered near-certain within 30 years. District-level risk varies enormously — Avcılar and Küçükçekmece are critical risk, while Sarıyer is significantly safer.
The 1999 Marmara earthquake (M7.6) caused 17,000+ deaths. Geologists estimate 60-70% probability of M7+ beneath Istanbul within 30 years. The fault runs directly under the Sea of Marmara — just 20km south of the city centre.
| District | Risk | Notes |
|---|---|---|
| Avcılar | Very High | Soft soil amplification, severe 1999 damage |
| Küçükçekmece | Very High | Fault proximity, lakeside soft soil |
| Başakşehir | High | Moderate risk, newer construction |
| Sarıyer / Beykoz | Lower | Rocky terrain, north Bosphorus |
Turkey mandates seismic retrofit for pre-2018 buildings in high-risk Istanbul districts — affecting 65,000+ buildings. Check whether your target property has a valid TBDY 2018 compliance certificate before purchasing.
Doğal Afet Sigortaları Kurumu (DASK) earthquake insurance is mandatory for all registered properties and required for mortgage applications. Properties without DASK coverage cannot be mortgaged.
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