Very strong mag. 6.4 earthquake - Osa, Provincia de Puntarenas, 52 km southeast of San Isidro, Costa Rica, on Friday, August 24, 1979 at 04:26 (GMT)
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Very strong magnitude 6.4 earthquake at 40 km depth
1 Jan 00:00 UTC: First to report: USGS after 30 seconds.
Depth: 40.0 km
Epicenter latitude / longitude: 8.951°N / 83.483°W (Osa, Provincia de Puntarenas, Costa Rica)
Antipode: 8.951°S / 96.517°E
Nearest volcano: Durika (51 km / 32 mi)
Nearby towns and cities:
5 km (3 mi) ESE of Ciudad Cortés (Puntarenas) (pop: 3,850) --> See nearby quakes!
30 km (18 mi) SSW of Buenos Aires (Puntarenas) (pop: 11,700) --> See nearby quakes!
36 km (23 mi) SSE of Mercedes (Pérez Zeledón, San José) (pop: 5,470) --> See nearby quakes!
47 km (29 mi) SSE of Daniel Flores (San José) (pop: 10,000) --> See nearby quakes!
52 km (32 mi) SSE of San Isidro (San José) (pop: 34,900) --> See nearby quakes!
56 km (35 mi) NW of Golfito (Puntarenas) (pop: 6,780) --> See nearby quakes!
68 km (43 mi) WNW of Corredor (Ciudad Neily, Puntarenas) (pop: 7,080) --> See nearby quakes!
126 km (78 mi) SSW of Ciudad de Limon (Limón) (pop: 63,100) --> See nearby quakes!
128 km (79 mi) SSE of San Jose (San José) (pop: 335,000) --> See nearby quakes!
187 km (116 mi) SE of Puntarenas (pop: 35,700) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 2.5 x 1014 joules (69.8 gigawatt hours, equivalent to 60036 tons of TNT or 3.8 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.
|6.4||40 km||Costa Rica||USGS|
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Recorded aftershocks, latest first (1 quake)
|Date and time||Mag|
|Oct 20, 1979 21:44|
42 years ago
|North Pacific Ocean, 81 km S of San Jose, San José, Costa Rica||More|