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Moderate mag. 4.9 earthquake - North Pacific Ocean, 91 km west of Nicoya, Provincia de Guanacaste, Costa Rica, on 2021-07-29 22:29:31

Moderate mag. 4.9 earthquake - North Pacific Ocean, 91 km west of Nicoya, Provincia de Guanacaste, Costa Rica, on 2021-07-29 22:29:31 Moderate mag. 4.9 earthquake - North Pacific Ocean, 91 km west of Nicoya, Provincia de Guanacaste, Costa Rica, on 2021-07-29 22:29:31

Moderate magnitude 4.9 earthquake at 15 km depth

30 Jul 04:31 UTC: First to report: VolcanoDiscovery after 2 minutes.
30 Jul 04:41: Now using data updates from INETER
30 Jul 04:42: Epicenter location corrected by 1 km (0.6 mi) towards ENE.
Update Fri, 30 Jul 2021, 04:31

Earthquake reported few minutes ago in or near Costa Rica

We are receiving unverified early reports of seismic activity in or around Costa Rica at approximately 04:29 GMT. There are no details yet on the magnitude or depth of this seismic-like event. It may or may not turn out to be an actual naturally occurring earthquake. We expect more accurate data to emerge in the next few minutes. The location and magnitude mentioned are indicative and temporary until the AllQuakes monitoring service receives more exact scientific data from a national or international seismological agency. Check back here shortly and stay safe.

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Earthquake details

Date & timeJul 30, 2021 04:29:31 UTC
Local time at epicenter2021-07-29 22:29:31
StatusConfirmed
Magnitude4.9
Depth15.0 km
Epicenter latitude / longitude10.249°N / 86.274°W (North Pacific Ocean, Costa Rica)
Antipode10.249°S / 93.726°E
Shaking intensityLight shaking
Felt66 reports
Primary data sourceINETER
Nearest volcanoOrosí (119 km / 74 mi)
Nearby towns and cities75 km (46 mi) WSW of Sardinal (pop: 3,270) | Show on map | Quakes nearby
75 km (47 mi) W of Santa Cruz (pop: 12,300) | Show on map | Quakes nearby
77 km (48 mi) WSW of Belen (pop: 2,720) | Show on map | Quakes nearby
91 km (56 mi) W of Nicoya (pop: 15,300) | Show on map | Quakes nearby
91 km (57 mi) WNW of Samara (pop: 1,070) | Show on map | Quakes nearby
96 km (60 mi) WNW of Hojancha (pop: 1,820) | Show on map | Quakes nearby
101 km (63 mi) WSW of Liberia (pop: 45,400) | Show on map | Quakes nearby
147 km (91 mi) WSW of San Jose (Upala) (pop: 31,400) | Show on map | Quakes nearby
160 km (99 mi) W of Puntarenas (pop: 35,700) | Show on map | Quakes nearby
242 km (151 mi) W of San Jose (pop: 335,000) | Show on map | Quakes nearby
159 km (99 mi) SSW of Isla de Ometepe Island (pop: 30,000) | Show on map | Quakes nearby
Weather at epicenter at time of quakeFew Clouds 28.6°C (84 F), humidity: 75%, wind: 5 m/s (10 kts) from E
Estimated seismic energy released1.4 x 1012 joules (392 megawatt hours, equivalent to 338 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.DepthLocationSource
4.915 km32 Km Al Oeste De Rosario, Costa RicaINETER
5.216 kmCosta Rica: 53 Km Al Oeste De Cabo Velas, Guanacaste.RSN
4.710 km65 Km WSW of Sardinal, Costa RicaUSGS
4.710 kmOFF COAST OF COSTA RICAEMSC
4.610 kmOff Coast of Costa RicaGFZ

Seismograms

Seismic station: Managua, Nicaragua (MGAN/NU network) | Distance from quake: 211 km / 131 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 (67)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Watching Tv (46.6 km E of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s : Slow shaking back and forth increasing intensity. Floor lamps were moving and the house seemed to shake like a pan when your making popcorn on the stove. | One user found this interesting.  
Plya Azul… at the Azul Ocean Beach Hotel (247.6 km E of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / 1-2 s : Felt a jolt for a second while laying in bed. More up and down than sideways. Am at Plya Azul…. At Azul Ocean Beach Hotel | One user found this interesting.  
Brasilito / Very weak shaking (MMI II) / single vertical bump / very short : Kinda my son jump on our bed | 2 users found this interesting.  
Surfside Costa Rica / Light shaking (MMI IV) / vibration and rolling / 5-10 s : I woke up ans my husband woke up. The bed was shaking like a heavy vibration. I thought he was shaking it. He said no.  
Playa Hermosa Guanacaste / Weak shaking (MMI III) / horizontal (sideways) swinging / 5-10 s : Thought my wife was rolling over or the dog was scratching. Wasn't either. I was able to observe some hanging plants swaying after the initial shaking.  
27 km of Santa Cruz, Guanacaste (49.4 km E of epicenter) [Map] / Moderate shaking (MMI V) / horizontal (sideways) swinging / 2-5 s
27 km of Santa Cruz, Guanacaste (49.4 km E of epicenter) [Map] / Moderate shaking (MMI V) / horizontal (sideways) swinging / 2-5 s
Playa Potrero, guanacaste, Costa Rica (67.7 km ENE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / very short : I felt like when you get down from a boat  
Concepcion, La Unión, Cartago (249.8 km E of epicenter) [Map] / not felt : I'm so far (reported through our app)  
27 km of Santa Cruz, Guanacaste (49.4 km E of epicenter) [Map] / Moderate shaking (MMI V) / horizontal (sideways) swinging / 2-5 s
27 km of Santa Cruz, Guanacaste (49.4 km E of epicenter) [Map] / Moderate shaking (MMI V) / horizontal (sideways) swinging / 2-5 s
Tamarindo Costa Rica (46.5 km E of epicenter) [Map] / Light shaking (MMI IV)
27 km of Santa Cruz, Guanacaste (49.4 km E of epicenter) [Map] / Moderate shaking (MMI V) / horizontal (sideways) swinging / 2-5 s
27 km of Santa Cruz, Guanacaste (49.4 km E of epicenter) [Map] / Moderate shaking (MMI V) / horizontal (sideways) swinging / 2-5 s
Playa Pelada (73.7 km ESE of epicenter) [Map] / Light shaking (MMI IV) / 2-5 s
29 km of Santa Cruz, Guanacaste (46.6 km E of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : windows rattled, rumbling sound  
Nosara (75.8 km ESE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : Light shaking  
Playa Potrero (250.3 km E of epicenter) [Map] / Light shaking (MMI IV) / 2-5 s
Tamarindo, Santa Cruz, guanacaste (47.8 km E of epicenter) [Map] / Light shaking (MMI IV) / 5-10 s
near Belen, Carrillo, Guanacaste (53.7 km E of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / 1-2 s
Tamarindo Costa Rica (49.5 km E of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : Rattle jolting  
Playa potrero (59.2 km ENE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 1-2 s
near Belen, Carrillo, Guanacaste (52.4 km ENE of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / very short
near Belen, Carrillo, Guanacaste (74.9 km ENE of epicenter) [Map] / Light shaking (MMI IV) / 5-10 s
near Santa Cruz, Guanacaste (51.9 km E of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s
Playa Flamengo (59.2 km ENE of epicenter) [Map] / Moderate shaking (MMI V) / both vertical and horizontal swinging / 2-5 s : Building shaking, felt an aftershock, much shorter a few minutes after first, longer quake.  
Langosta (222.3 km E of epicenter) [Map] / Light shaking (MMI IV) / 5-10 s : Shaking and rocking . Lights and furniture moved.  
Villa Horizonte (56 km ENE of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 2-5 s
near Belen, Carrillo, Guanacaste (71.2 km ENE of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 5-10 s : Was sitting in a chair and felt my balls swinging  
tamarindo (48.6 km E of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : My mirror fell down and my bed was moving quite a little. I live on a second story building.  
Playa tamarindo (50.7 km E of epicenter) [Map] / Moderate shaking (MMI V) / rattling, vibrating / 2-5 s : Good shake… woke us up… dog got scared  
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Earlier earthquakes in the same area

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