M 6.6 earthquake – 21 km WNW of Zīr Āb, Iran

Jul 2, 1957 · 00:42 UTC · Jul 2, 1957
Local time: Jul 2, 1957 · 04:12 (UTC+3:30)

StrongShallow · 15 km Reviewed by a seismologist

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Magnitude: 6.6moment magnitude (mw)
Depth: 15 kmShallow earthquake
Epicenter: 36.277, 52.77821 km from Zīr Āb
Energy released: 120 kilotons of TNTabout 8 × Hiroshima
Felt reports: —"Did You Feel It?" responses
Shaking intensity: 7.4max. instrumental (MMI)
Aftershocks: 0M2.5+ within 43 km
Significance: 672USGS score, 0–1,000+

The strongest within 300 km on record

No earthquake this strong has been recorded this close since our catalog begins in 1900.

How strong was it?

Strong earthquake. It released 120 kilotons of TNT, 251 times the energy of a magnitude 5.0. Bars use the magnitude scale: every step is about 32 times more energy.

Chile 1960 M 9.5

Japan 2011 M 9.1

San Francisco 1906 M 7.9

Turkey 2023 M 7.8

Haiti 2010 M 7.0

Northridge 1994 M 6.7

This earthquake M 6.6

The strongest earthquakes within 300 km

Since 1900, around Iran.