Very strong mag. 6.4 earthquake - Aserri, 38 km south of San Jose, San José, Costa Rica, on Saturday, November 20, 2004 at 08:07 (GMT)

Very strong mag. 6.4 earthquake - Aserri, 38 km south of San Jose, San José, Costa Rica, on Saturday, November 20, 2004 at 08:07 (GMT)

Very strong magnitude 6.4 earthquake at 16 km depth

1 Jan 00:00 UTC: First to report: USGS after 30 seconds.
Date & time: Nov 20, 2004 08:07:22 UTC
Magnitude: 6.4
Depth: 16.0 km
Epicenter latitude / longitude: 9.602°N / 84.172°W (Aserri, Provincia de San José, Costa Rica)
Antipode: 9.602°S / 95.828°E
Nearest volcano: Irazu (55 km / 34 mi)
Nearby towns and cities:
17 km (11 mi) SSE of Tejar (Acosta, San José) (pop: 22,400) --> See nearby quakes!
29 km (18 mi) SSE of San Rafael Abajo (Puriscal, San José) (pop: 27,400) --> See nearby quakes!
30 km (19 mi) SSW of Aserri (San José) (pop: 25,900) --> See nearby quakes!
32 km (20 mi) SSW of San Miguel (San José) (pop: 28,800) --> See nearby quakes!
34 km (21 mi) SSW of San Felipe (San José) (pop: 25,000) --> See nearby quakes!
38 km (23 mi) SSW of Curridabat (San José) (pop: 34,600) --> See nearby quakes!
38 km (24 mi) SSW of San Jose (San José) (pop: 335,000) --> See nearby quakes!
42 km (26 mi) SSW of San Vicente (San José) (pop: 34,400) --> See nearby quakes!
42 km (26 mi) SSW of San Vicente (San José) (pop: 34,400) --> See nearby quakes!
132 km (82 mi) WSW of Puerto Limon (Limón) (pop: 63,100) --> 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!) More info
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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.
Mag.DepthLocationSource
6.416 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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Aftershocks

[More info]

Recorded aftershocks, latest first (13 quakes)

Date and timeMag
Depth
LocationDetails
May 17, 2005 08:56
17 years ago
4.0

23 km
Quepos, Provincia de Puntarenas, 25 km S of Tejar, Costa RicaMore
May 2, 2005 20:08
17 years ago
4.2

22 km
North Pacific Ocean, 3.8 km S of Puntarenas, Costa RicaMore
Mar 9, 2005 09:00
17 years ago
4.2

84 km
Costa RicaMore
Feb 14, 2005 03:31
17 years ago
5.0

37 km
North Pacific Ocean, 59 km SW of San Isidro, Costa RicaMore
Jan 24, 2005 17:45
17 years ago
5.3

9 km
North Pacific Ocean, 43 km SE of Isla Cabo Blanco Island, Costa RicaMore
Jan 21, 2005 11:39
17 years ago
4.4

35 km
Costa RicaMore
Jan 10, 2005 12:33
17 years ago
4.3

5.7 km
Costa RicaMore
Nov 21, 2004 08:44
17 years ago
4.7

4.7 km
Quepos, Provincia de Puntarenas, 43 km S of San Jose, San José, Costa RicaMore
Nov 20, 2004 14:08
17 years ago
4.4

10 km
Poas, Provincia de Alajuela, 26 km NW of San Jose, San José, Costa RicaMore
Nov 20, 2004 10:57
17 years ago
4.1

10 km
Costa RicaMore
Nov 20, 2004 09:04
17 years ago
4.1

10 km
Aserri, 33 km SW of San Jose, San José, Costa RicaMore
Nov 20, 2004 08:27
17 years ago
4.5

10 km
Parrita, Provincia de Puntarenas, 48 km SW of San Jose, San José, Costa RicaMore
Nov 20, 2004 08:15
17 years ago
4.4

10 km
Alajuela, Provincia de Alajuela, 31 km NW of San Jose, San José, Costa RicaMore

Earlier earthquakes in the same area

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