Light mag. 4.1 earthquake - South Pacific Ocean, 86 km southwest of San Antonio, Region de Valparaiso, Chile, on 28 Apr 2:25 pm (GMT -4) -
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Light magnitude 4.1 earthquake at 31 km depth
28 Apr 18:36 UTC: First to report: GUG (U. Chile) after 11 minutes.
28 Apr 18:40: Hypocenter depth recalculated from 32.2 to 31.2 km (from 20 to 19.4 mi).
28 Apr 18:40: Hypocenter depth recalculated from 32.2 to 31.2 km (from 20 to 19.4 mi).
Earthquake details
| Date & time | Apr 28, 2021 18:25:12 UTC - |
| Local time at epicenter | 28 Apr 2:25 pm (GMT -4) |
| Status | Confirmed |
| Magnitude | 4.1 |
| Depth | 31.2 km |
| Epicenter latitude / longitude | 34.082°S / 72.33°W  (South Pacific Ocean, Chile) |
| Antipode | 34.082°N / 107.67°E |
| Shaking intensity | Weak shaking near epicenter |
| Felt | 0 reports |
| Primary data source | GUG (U. Chile) |
| Nearest volcano | Palomo (196 km / 122 mi) |
| Nearby towns and cities | 86 km (53 mi) SW of San Antonio (pop: 85,700) | Show on map | Quakes nearby 89 km (55 mi) SW of Cartagena (San Antonio) (pop: 16,900) | Show on map | Quakes nearby 112 km (69 mi) WSW of Melipilla (pop: 63,100) | Show on map | Quakes nearby 133 km (83 mi) SSW of Valparaiso (pop: 282,400) | Show on map | Quakes nearby 138 km (86 mi) SSW of Viña del Mar (pop: 294,600) | Show on map | Quakes nearby 146 km (91 mi) W of Rancagua (pop: 212,700) | Show on map | Quakes nearby 162 km (101 mi) NNW of Talca (pop: 197,500) | Show on map | Quakes nearby 170 km (106 mi) WSW of Puente Alto (pop: 510,400) | Show on map | Quakes nearby 170 km (106 mi) WSW of Santiago de Chile (pop: 4,837,300) | Show on map | Quakes nearby |
| Weather at epicenter at time of quake | Clear Sky  15°C (59 F), humidity: 77%, wind: 6 m/s (11 kts) from SSW |
| 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 | 31 km | 93 Km Al SO De El Tabo, Chile | GUG (U. Chile) |
| 4.8 | 13 km | OFFSHORE O'HIGGINS, CHILE | EMSC |
| 4.7 | 15 km | Off Coast of Central Chile | GFZ |
| 4.6 | 10 km | Off 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.
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