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Moderate mag. 4.5 earthquake - North Pacific Ocean, 99 km west of Liberia, Provincia de Guanacaste, Costa Rica, on Sunday, Mar 19, 2023 at 3:51 am (GMT -6) -

I felt this quake
Moderate mag. 4.5 earthquake - North Pacific Ocean, 99 km west of Liberia, Provincia de Guanacaste, Costa Rica, on Sunday, Mar 19, 2023 at 3:51 am (GMT -6) Moderate mag. 4.5 earthquake - North Pacific Ocean, 99 km west of Liberia, Provincia de Guanacaste, Costa Rica, on Sunday, Mar 19, 2023 at 3:51 am (GMT -6)

Moderate magnitude 4.5 earthquake at 10 km depth

19 Mar 10:00 UTC: First to report: INETER after 8 minutes.
19 Mar 10:07: Magnitude recalculated from 4.5 to 4.3. Hypocenter depth recalculated from 9.0 to 14.0 km (from 5.6 to 8.7 mi). Epicenter location corrected by 5.9 km (3.7 mi) towards ENE.
19 Mar 10:12: Now using data updates from USGS
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Earthquake details

Date & timeMar 19, 2023 09:51:57 UTC -
Local time at epicenterSunday, Mar 19, 2023 at 3:51 am (GMT -6)
Depth10.0 km
Epicenter latitude / longitude10.6019°N / 86.3444°W (North Pacific Ocean, Costa Rica)
Antipode10.602°S / 93.656°E
Shaking intensityModerate shaking
Felt2 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoOrosí (104 km / 65 mi)
Nearby towns and cities65 km (40 mi) WNW of Tamarindo (pop: 6,380) | Show on map | Quakes nearby
77 km (48 mi) W of Sardinal (pop: 3,270) | Show on map | Quakes nearby
91 km (57 mi) WNW of Santa Cruz (pop: 12,300) | Show on map | Quakes nearby
99 km (62 mi) W of Liberia (pop: 45,400) | Show on map | Quakes nearby
138 km (86 mi) WSW of San Jose (Upala) (pop: 31,400) | Show on map | Quakes nearby
171 km (106 mi) S of Managua (Nicaragua) (pop: 973,100) | Show on map | Quakes nearby
179 km (111 mi) WNW of Puntarenas (pop: 35,700) | Show on map | Quakes nearby
258 km (161 mi) WNW of San Jose (pop: 335,000) | Show on map | Quakes nearby
131 km (82 mi) SW of Isla de Ometepe Island (pop: 30,000) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds 27.9°C (82 F), humidity: 76%, wind: 6 m/s (12 kts) from NE
Estimated seismic energy released3.5 x 1011 joules (98.6 megawatt hours, equivalent to 84.8 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.
4.510 km57 Km Al Noroeste De Rosario, Costa RicaUSGS
4.314 km76 Km W of Sardinal, Costa RicaINETER
4.510 kmOff Coast of Costa RicaRaspberryShake
4.410 kmOff Coast of Costa RicaGFZ
4.919 kmCosta Rica: 76 Km Al Oeste De Cabo Velas, Guanacaste.RSN


Seismic station: Managua, Nicaragua (MGAN/NU network) | Distance from quake: 172 km / 107 mi | Show on map | Station Info
Seismic station Managua, Nicaragua: 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: 0.2-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (2)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Playa Potrero, Guanacaste, Costa Rica / Very weak shaking (MMI II) / horizontal (sideways) swinging / 15-20 s : Very week shaking I felt in awake moment in my bed. I felt gentle movement first that was followed by some softer movements for 10 - 15 seconds. Felt like a low magnitude around 4.  
near Liberia, Guanacaste (103.6 km E of epicenter) [Map] / Moderate shaking (MMI V)

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