Moderate mag. 4.1 earthquake - South Pacific Ocean, 83 km southwest of San Antonio, Region de Valparaiso, Chile, on 21 Apr 4:08 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, 18 Apr 11:18 pm (GMT -4), which had occurred 2 days earlier.
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Moderate magnitude 4.1 earthquake at 15 km depth
21 Apr 08:22 UTC: First to report: GUG (U. Chile) after 14 minutes.
Earthquake details
| Date & time | Apr 21, 2021 08:08:23 UTC - |
| Local time at epicenter | 21 Apr 4:08 am (GMT -4) |
| Status | Confirmed |
| Magnitude | 4.1 |
| Depth | 15.0 km |
| Epicenter latitude / longitude | 34.042°S / 72.329°W  (South Pacific Ocean, Chile) |
| Antipode | 34.042°N / 107.671°E |
| Shaking intensity | Light shaking near epicenter |
| Felt | 0 reports |
| Primary data source | GUG (U. Chile) |
| Nearest volcano | Palomo (197 km / 122 mi) |
| Nearby towns and cities | 83 km (52 mi) SW of San Antonio (pop: 85,700) | Show on map | Quakes nearby 86 km (53 mi) SW of Cartagena (San Antonio) (pop: 16,900) | Show on map | Quakes nearby 110 km (68 mi) WSW of Melipilla (pop: 63,100) | Show on map | Quakes nearby 129 km (80 mi) SSW of Valparaiso (pop: 282,400) | Show on map | Quakes nearby 134 km (83 mi) SSW of Viña del Mar (pop: 294,600) | Show on map | Quakes nearby 147 km (91 mi) W of Rancagua (pop: 212,700) | Show on map | Quakes nearby 166 km (103 mi) NNW of Talca (pop: 197,500) | Show on map | Quakes nearby 169 km (105 mi) WSW of Santiago de Chile (pop: 4,837,300) | Show on map | Quakes nearby 169 km (105 mi) WSW of Puente Alto (pop: 510,400) | Show on map | Quakes nearby |
| Weather at epicenter at time of quake | Light Rain  15.6°C (60 F), humidity: 87%, wind: 17 m/s (33 kts) from NNE |
| Estimated seismic energy released | 8.9 x 1010 joules (24.8 megawatt hours, equivalent to 21.3 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 |
| 4.1 | 15 km | 47 Km Al O De Navidad, Chile | GUG (U. Chile) |
| 4.5 | 10 km | OFFSHORE O'HIGGINS, CHILE | EMSC |
| 4.5 | 10 km | Near Coast of Central Chile | GFZ |
| 4.4 | 10 km | 80 Km SW of San Antonio, Chile | USGS |
| 4.4 | 10 km | Near Coast of Central Chile | USP |
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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