M 7.7 earthquake – 19 km SSE of Amorgós, Greece
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Local time: Jul 9, 1956 · 05:11 (UTC+2)
MajorShallow · 20 km
Reviewed by a seismologist
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- Magnitude
- 7.7moment magnitude (mw)
- Depth
- 20 kmShallow earthquake
- Epicenter
- 36.664, 25.957121 km from Kos
- Energy released
- 5.4 megatons of TNTabout 357 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- 8.4max. instrumental (MMI)
- Aftershocks
- 9M2.5+ within 190 km, up to 60 days
- Significance
- 912USGS score, 0–1,000+
The strongest here since 1903
The last earthquake at least as strong within 300 km struck on Aug 11, 1903.
How strong was it?
Major earthquake. It released 5.4 megatons of TNT, 11,220 times the energy of a magnitude 5.0. Bars use the magnitude scale: every step is about 32 times more energy.
Aftershocks
9 earthquakes of M2.5+ within 190 km in the 60 days after.
- 5.5 25 km SSW of Amorgós, Greece Jul 9, 1956
- 5.5 22 km E of Amorgós, Greece Jul 9, 1956
- 5.3 40 km ESE of Emporeío, Greece Jul 9, 1956
- 5.7 Dodecanese Islands, Greece Jul 10, 1956
- 5.4 15 km ENE of Astypálaia, Greece Jul 22, 1956
- 5.6 32 km N of Eloúnda, Greece Jul 30, 1956
- 6.1 63 km N of Sitia, Greece Jul 30, 1956
- 5.7 58 km SE of Emporeío, Greece Jul 30, 1956
- 5.8 49 km NNE of Eloúnda, Greece Sep 6, 1956
The strongest earthquakes within 300 km
Since 1900, around Greece.
- 7.9 Southern Greece Aug 11, 1903
- 7.3 34 km S of Sarigerme, Turkey Apr 25, 1957
- 7.3 15 km NNW of Karpathos, Greece Feb 9, 1948
- 7.2 61 km W of Eresós, Greece Dec 19, 1981
- 7.2 9 km NNW of Karaburun, Turkey Jul 23, 1949
- 7.1 27 km SSE of Sarigerme, Turkey Apr 24, 1957
- 7.0 13 km NNE of Néon Karlovásion, Greece Oct 30, 2020
- 7.0 5 km NNW of Kéfalos, Greece Jun 26, 1926