Very strong mag. 6.6 earthquake - 309 km southeast of Lissabon, Lisboa, Portugal, on Sunday, March 15, 1964 at 22:30 GMT
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Very strong magnitude 6.6 earthquake at 25 km depth
Magnitude: 6.6
Depth: 25.0 km
Epicenter latitude / longitude: 36.221°N / 7.59°W

Antipode: 36.221°S / 172.41°E
Nearby towns and cities:
93 km (58 mi) SSE of Olhao (Olhão) (pop: 29,200) --> See nearby quakes!
94 km (58 mi) SSE of Faro (pop: 41,400) --> See nearby quakes!
96 km (60 mi) SSE of Laranjeiro (Moncarapacho) (pop: 20,500) --> See nearby quakes!
101 km (63 mi) S of Tavira (pop: 15,100) --> See nearby quakes!
105 km (65 mi) SSE of Quarteira (pop: 18,800) --> See nearby quakes!
109 km (68 mi) SSE of Loule (Loulé) (pop: 23,100) --> See nearby quakes!
113 km (70 mi) SSE of Albufeira (pop: 15,900) --> See nearby quakes!
133 km (82 mi) SE of Portimao (pop: 38,500) --> See nearby quakes!
138 km (86 mi) SE of Lagos (pop: 18,800) --> See nearby quakes!
309 km (192 mi) SSE of Lissabon (pop: 517,800) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 5 x 1014 joules (139 gigawatt hours, equivalent to 1.2 x 105 tons of TNT or 7.5 atomic bombs!) | about seismic energy
Data for the same earthquake reported by different agencies
Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
Mag. | Depth | Location | Source |
6.6 | 25 km | Strait of Gibraltar (Portugal) | USGS |
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Aftershocks
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Recorded aftershocks, latest first (0 quake)
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