Light mag. 3.9 earthquake - South Pacific Ocean, 90 km southwest of San Antonio, Region de Valparaiso, Chile, on 23 Apr 12:13 am (GMT -4) -
This quake was likely an aftershock of the 5.3 quake South Pacific Ocean, 88 km southwest of San Antonio, Region de Valparaiso, Chile, 21 Apr 8:17 pm (GMT -4), which had occurred 1 day 4 hours earlier.
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Light magnitude 3.9 earthquake at 20 km depth
23 Apr 04:28 UTC: First to report: EMSC after 15 minutes.
Earthquake details
| Date & time | Apr 23, 2021 04:13:14 UTC - |
| Local time at epicenter | 23 Apr 12:13 am (GMT -4) |
| Status | Confirmed |
| Magnitude | 3.9 |
| Depth | 20.0 km |
| Epicenter latitude / longitude | 34.01°S / 72.44°W  (South Pacific Ocean, Chile) |
| Antipode | 34.01°N / 107.56°E |
| Shaking intensity | Weak shaking near epicenter |
| Felt | 0 reports |
| Primary data source | EMSC (European-Mediterranean Seismological Centre) |
| Nearest volcano | Palomo (208 km / 129 mi) |
| Nearby towns and cities | 90 km (56 mi) WSW of San Antonio (pop: 85,700) | Show on map | Quakes nearby 92 km (57 mi) SW of Cartagena (San Antonio) (pop: 16,900) | Show on map | Quakes nearby 119 km (74 mi) WSW of Melipilla (pop: 63,100) | Show on map | Quakes nearby 132 km (82 mi) SW of Valparaiso (pop: 282,400) | Show on map | Quakes nearby 137 km (85 mi) SW of Viña del Mar (pop: 294,600) | Show on map | Quakes nearby 157 km (98 mi) W of Rancagua (pop: 212,700) | Show on map | Quakes nearby 173 km (108 mi) NNW of Talca (pop: 197,500) | Show on map | Quakes nearby 177 km (110 mi) WSW of Santiago de Chile (pop: 4,837,300) | Show on map | Quakes nearby 178 km (111 mi) WSW of Puente Alto (pop: 510,400) | Show on map | Quakes nearby |
| Weather at epicenter at time of quake | Scattered Clouds  14.4°C (58 F), humidity: 74%, wind: 7 m/s (13 kts) from SSW |
| Estimated seismic energy released | 4.5 x 1010 joules (12.4 megawatt hours, equivalent to 10.7 tons of TNT) | about seismic energy |
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 |
| 3.9 | 20 km | OFFSHORE O'HIGGINS, CHILE | EMSC |
| 3.9 | 20 km | 56 Km Al O De Navidad, Chile | GUG (U. Chile) |
| 4.4 | 10 km | Near the Coast of Libertador O'Higgins, Chile | USGS |
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Earlier earthquakes in the same area
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