Information on the earthquake: moderate mag. 4.3 earthquake
Moderate magnitude earthquake 4.3 to 10 km deep
Sep 21 13:50 UTC: First to report: EMSC after 30 minutes.
Updated Tue Sep 21, 2021, 13:54
Moderate 4.3 earthquake strikes near Puerto Lebu, Provincia de Arauco, Region del Biobio, Chile
4.3 earthquake September 21 08:20 (GMT -5)
The event was classified by the Euro-Mediterranean Seismological Center (EMSC), the first seismological agency to report it.
Cities near the epicenter where the quake could have been felt as very weak tremors include Puerto Lebu (population 22,300) located 94 km from the epicenter.
VolcanoDiscovery will automatically update the magnitude and depth if these change and follow up if other significant earthquake news becomes available. If you are in the region, please share your experience with us through our reporting mechanism, online or through our mobile app. This will help us provide more first-hand updates to anyone in the world who is interested in learning more about this earthquake.
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Earthquake data
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Date and hour : 21 Sep 2021 13:20:21 UTC –
Local time at epicenter: Tuesday Sep 21, 2021 8:20 am (GMT -5)
Magnitude: 4.3
Depth: 10.0 km
Latitude / longitude of epicenter: 37.08 ° S / 74.48 ° W↗ 
(South Pacific Ocean, Chile)
Antipode: 37.08 ° N / 105.52 ° E↗
Nearby towns and villages:
94 km (58 mi) northwest of Puerto Lebu (Arauco) (pop: 22,300) -> Observe the earthquakes nearby!
110 km (68 mi) to WNW of Curanilahue (Arauco) (pop: 30,600) -> Observe the earthquakes nearby!
117 km (73 mi) west of Lota (pop: 49,800) -> Watch the earthquakes nearby!
119 km (74 mi) west of Coronelle (pop: 92,900) -> See nearby earthquakes!
128 km (79 mi) OSO of Talcahuano (pop: 253,000) -> See nearby earthquakes!
130 km (81 mi) west of Chiguayante (pop: 82,500) -> Observe the earthquakes nearby!
130 km (81 mi) to OSO of Design (pop: 215,400) -> Observe the earthquakes nearby!
218 km (135 mi) OSO of Chillan (pop: 150,400) -> Observe the earthquakes nearby!
524 km (325 mi) southwest of Puente Alto (pop: 510 400) -> Observe the earthquakes nearby!
532 km (331 mi) southwest of Santiago (pop: 4,837,300) -> Watch the earthquakes nearby!
Clear sky
11.3 ° C (52 F), humidity: 81%, wind: 8 m / s (15 kts) from SMain data source: EMSC (European-Mediterranean Seismological Center)
Estimated energy released: 1.8 x 1011 joules (49.4 megawatt hours, equivalent to 42.5 tonnes of TNT) Find out more
If you did NOT feel the earthquake although you are in the area, please report it! Your contribution is valuable to earthquake science, seismic risk analysis and mitigation efforts. You can use your device’s location or the map to show where you were during the earthquake. Thank you!
Data for the same earthquake reported by different agencies
Info: The more agencies report the same earthquake and publish similar data, the more confidence you can have in the data. It normally takes up to a few hours for the seismic parameters to be calculated with near optimum accuracy.
| Mag. | Depth | Site | Source |
| 4.3 | 10 km | BIO-BIO OFFSHORE, CHILE | EMSC |
Previous earthquakes in the same region
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