Strong mag. 6.2 earthquake - North Pacific Ocean, 57 km west of Liberia, Provincia de Guanacaste, Costa Rica, on Sunday, October 4, 1987 at 08:15 (GMT)

Strong mag. 6.2 earthquake - North Pacific Ocean, 57 km west of Liberia, Provincia de Guanacaste, Costa Rica, on Sunday, October 4, 1987 at 08:15 (GMT)

Strong magnitude 6.2 earthquake at 48 km depth

1 Jan 00:00 UTC: First to report: USGS after 30 seconds.
Date & time: Oct 4, 1987 08:15:18 UTC
Magnitude: 6.2
Depth: 47.9 km
Epicenter latitude / longitude: 10.823°N / 85.926°W (North Pacific Ocean, Costa Rica)
Antipode: 10.823°S / 94.074°E
Nearest volcano: Orosí (52 km / 32 mi)
Nearby towns and cities:
42 km (26 mi) SW of La Cruz (pop: 4,320) --> See nearby quakes!
46 km (28 mi) NW of Sardinal (pop: 3,270) --> See nearby quakes!
57 km (36 mi) WNW of Liberia (pop: 45,400) --> See nearby quakes!
73 km (45 mi) NNW of Santa Cruz (pop: 12,300) --> See nearby quakes!
87 km (54 mi) W of San Jose (Upala) (pop: 31,400) --> See nearby quakes!
91 km (57 mi) NW of Nicoya (pop: 15,300) --> See nearby quakes!
150 km (93 mi) SSE of Managua (Nicaragua) (pop: 973,100) --> See nearby quakes!
152 km (94 mi) NW of Puntarenas (pop: 35,700) --> See nearby quakes!
217 km (135 mi) WNW of San Francisco (pop: 55,900) --> See nearby quakes!
225 km (140 mi) WNW of San Jose (pop: 335,000) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.3 x 1014 joules (35 gigawatt hours, equivalent to 30089 tons of TNT or 1.9 atomic bombs!) | about seismic energy
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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.
6.248 kmCosta RicaUSGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.
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Recorded aftershocks, latest first (3 quakes)

Date and timeMag
Oct 28, 1987 19:16
34 years ago

33 km
La Cruz, 62 km N of Liberia, Provincia de Guanacaste, Costa RicaMore
Oct 26, 1987 05:45
34 years ago

10 km
North Pacific Ocean, 106 km W of Liberia, Provincia de Guanacaste, Costa RicaMore
Oct 4, 1987 19:15
34 years ago

64 km
North Pacific Ocean, 75 km SW of Liberia, Provincia de Guanacaste, Costa RicaMore

Earlier earthquakes in the same area

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