Earthquakes in Tehran
Tehran, Iran's capital of 15 million, is widely considered one of the world's most earthquake-threatened megacities. The North Tehran Fault, Mosha Fault, and other active fault systems run directly beneath or very near the city, while Iran's position at the Arabian-Eurasian plate collision zone generates frequent large earthquakes across the country.
Why Does Tehran Face Earthquake Risk?
Tehran sits at the foot of the Alborz Mountains directly above multiple active thrust and strike-slip faults. The North Tehran Fault is capable of generating an M7.2 earthquake directly beneath the city. Iranian seismologists estimate that such an earthquake could kill 200,000-400,000 people given Tehran's dense construction and many unreinforced masonry buildings.
Active Fault Systems
- North Tehran Fault
- Mosha Fault
- Rey Fault
Safety Advice
Iran's BHRC (Building and Housing Research Centre) monitors seismicity. Tehran has a poor record of enforcing modern building codes, and much of the city's building stock — particularly in southern and eastern districts — consists of older unreinforced masonry highly vulnerable to earthquake damage.
Historical Earthquake Context
Historical earthquakes have destroyed Tehran multiple times, including in 855, 1177, and 1830. The devastating 2003 Bam earthquake (M6.6, 26,271 deaths) and 1990 Manjil-Rudbar earthquake (M7.4, 40,000 deaths) north of Tehran demonstrated the extreme seismic hazard across Iran.
Fault Maps & Tectonic Setting
Tectonic and seismic hazard maps from Wikimedia Commons, USGS, and NASA — open licenses (CC / Public Domain)
Maps sourced from Wikimedia Commons, USGS, and NASA under open licenses. Attribution required where specified. Click any map to enlarge.
FAQ
Frequently Asked Questions
How serious is Tehran's earthquake risk?
Tehran's earthquake risk is considered extremely high. Seismologists estimate a 30% probability of an M7.2+ earthquake striking Tehran within 75 years. With 15 million people and many unreinforced buildings, Iranian experts have estimated a potential death toll of 200,000-400,000 in a worst-case scenario.
How seismically active is Tehran?
Tehran is surrounded by multiple active fault systems including the North Tehran Fault, Mosha Fault, and Ray Fault, all capable of M7+ earthquakes. The region experiences regular minor seismicity and a M5+ event every few years. Scientists consider a major Tehran earthquake a matter of when, not if — the city has not experienced a catastrophic event since the 1830 earthquake.
Why has Tehran not had a recent major earthquake?
Seismologists note that the long period of relative seismic quiet in Tehran represents stress accumulation rather than absence of hazard. The North Tehran Fault is considered overdue for a major rupture based on paleoseismic evidence. This 'seismic gap' is a concern, not reassurance, for scientists monitoring the region.
Is Tehran prepared for a major earthquake?
Iran has invested in earthquake risk reduction following the 2003 Bam earthquake (M6.6, 26,000 deaths). Tehran has updated building codes, established emergency response infrastructure, and conducted public awareness campaigns. However, millions of pre-code buildings remain in the city, and a direct M7+ event could cause hundreds of thousands of casualties.
Where can I see live earthquake data for Tehran?
Track earthquakes near Tehran on the Earthquake Globe app or at earthquakes.site/map?country=iran. The International Institute of Earthquake Engineering and Seismology (IIEES) at iiees.ac.ir and the Seismological Research Center (irsc.ut.ac.ir) provide Iranian earthquake data.
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