Quake Info: Light Mag. 3.4 Earthquake - Provincia de Heredia, 29 km North of San Jose, San José, Costa Rica, on Friday, Mar 17, 2023 at 6:24 pm (GMT -6)

Light magnitude 3.4 earthquake at 6 km depth

18 Mar 00:25 UTC: First to report: VolcanoDiscovery after 1 minute.
18 Mar 00:42: Now using data updates from INETER

Earthquake details

Date & time	Mar 18, 2023 00:24:02 UTC -
Local time at epicenter	Friday, Mar 17, 2023 at 6:24 pm (GMT -6)
Status	Confirmed
Magnitude	3.4
Depth	6.0 km
Epicenter latitude / longitude	10.188°N / 84.152°W (Heredia, Provincia de Heredia, Costa Rica)
Antipode	10.188°S / 95.848°E
Shaking intensity	Weak shaking
Felt	9 reports
Primary data source	INETER
Nearest volcano	Barva (8 km / 5 mi)
Nearby towns and cities	14 km (9 mi) N of Santo Domingo (Santa Bárbara, Heredia) (pop: 5,750) \| Show on map \| Quakes nearby 20 km (13 mi) NNE of Alajuela (pop: 47,500) \| Show on map \| Quakes nearby 20 km (13 mi) N of Mercedes (Heredia) (pop: 26,000) \| Show on map \| Quakes nearby 21 km (13 mi) N of Heredia (pop: 21,900) \| Show on map \| Quakes nearby 22 km (14 mi) N of San Francisco (Heredia) (pop: 55,900) \| Show on map \| Quakes nearby 28 km (17 mi) NNW of San Vicente de Moravia (San Vicente, San José) (pop: 34,400) \| Show on map \| Quakes nearby 28 km (17 mi) NNW of San Vicente (San José) (pop: 34,400) \| Show on map \| Quakes nearby 29 km (18 mi) NNW of San Jose (San José) (pop: 335,000) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake	Overcast Clouds 14.9°C (59 F), humidity: 83%, wind: 1 m/s (2 kts) from SE
Estimated seismic energy released	7.9 x 10⁹ joules (2.21 megawatt hours, equivalent to 1.9 tons of TNT) \| 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.

Mag.	Depth	Location	Source
3.4	6 km	3 Km Al Norte De Vara Blanca, Costa Rica	INETER
4.3	3 km	Costa Rica: 3 Km Al Noreste De Varablanca, Heredia.	RSN

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Seismograms

Seismic station: Heredia, Costa Rica (HDC/G network) | Distance from quake: 21 km / 13 mi | Show on map | Station Info

Seismic station Heredia, Costa Rica: vertical movement plot around time of quake (source: IRIS/BUD)

Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.5-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool

User reports for this quake (9)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.

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Peace lodge (3.9 km SSW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 1-2 s : Happened twice within several minutes

Home (7.2 km SSW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s

Poasito (8.8 km WSW of epicenter) [Map] / Weak shaking (MMI III) / 10-15 s (reported through our app)

El roble de Santa barbara (36.2 km NNE of epicenter) [Map] / Moderate shaking (MMI V) : My sliding glass door started shaking Stopped then got a 2nd tremor

Vats Blanca Costa Rica (42.3 km SSE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 1-2 s : Felt the building shake

San Rafael, Escazú, San José (27.2 km S of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s : Sitting on the couch on the fourth floor

San Juan, Grecia, Provincia de Alajuela (12 km WSW of epicenter) [Map] / Weak shaking (MMI III) : 3 or 4 slight vertical waves

Ciudad colon / Very weak shaking (MMI II) / single lateral shake / 2-5 s

Earlier earthquakes in the same area

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Light mag. 3.4 earthquake - Provincia de Heredia, 29 km north of San Jose, San José, Costa Rica, on Friday, Mar 17, 2023 at 6:24 pm (GMT -6) -

Light magnitude 3.4 earthquake at 6 km depth

Earthquake details

Data for the same earthquake reported by different agencies

Seismograms

User reports for this quake (9)

Earlier earthquakes in the same area

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Light mag. 3.4 earthquake - Provincia de Heredia, 29 km north of San Jose, San José, Costa Rica, on Friday, Mar 17, 2023 at 6:24 pm (GMT -6) - writeAge(1679099042)

Light magnitude 3.4 earthquake at 6 km depth

Earthquake details

Data for the same earthquake reported by different agencies

Seismograms

User reports for this quake (9)

Earlier earthquakes in the same area

Support us - Help us upgrade our services!

Light mag. 3.4 earthquake - Provincia de Heredia, 29 km north of San Jose, San José, Costa Rica, on Friday, Mar 17, 2023 at 6:24 pm (GMT -6) -