Light mag. 3.7 earthquake - South Pacific Ocean, 90 km southwest of San Antonio, Region de Valparaiso, Chile, on Friday, April 23, 2021 at 00:47 GMT -
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 1 hours earlier.
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Light magnitude 3.7 earthquake at 18 km depth
23 Apr 01:02 UTC: First to report: GUG (U. Chile) after 14 minutes.
23 Apr 22:46: Hypocenter depth recalculated from 30.2 to 17.9 km (from 18.8 to 11.1 mi).
23 Apr 22:46: Hypocenter depth recalculated from 30.2 to 17.9 km (from 18.8 to 11.1 mi).
Earthquake details
| Date & time | Apr 23, 2021 00:47:43 UTC - |
| Local time at epicenter | |
| Status | Confirmed |
| Magnitude | 3.7 |
| Depth | 17.9 km |
| Epicenter latitude / longitude | 34.066°S / 72.402°W  (South Pacific Ocean, Chile) |
| Antipode | 34.066°N / 107.598°E |
| Shaking intensity | Weak shaking near epicenter |
| Felt | 0 reports |
| Primary data source | GUG (U. Chile) |
| Nearest volcano | Palomo (203 km / 126 mi) |
| Nearby towns and cities | 90 km (56 mi) SW of San Antonio (pop: 85,700) | Show on map | Quakes nearby 93 km (58 mi) SW of Cartagena (San Antonio) (pop: 16,900) | Show on map | Quakes nearby 117 km (73 mi) WSW of Melipilla (pop: 63,100) | Show on map | Quakes nearby 135 km (84 mi) SSW of Valparaiso (pop: 282,400) | Show on map | Quakes nearby 140 km (87 mi) SSW of Viña del Mar (pop: 294,600) | Show on map | Quakes nearby 153 km (95 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 176 km (109 mi) WSW of Santiago de Chile (pop: 4,837,300) | Show on map | Quakes nearby 176 km (109 mi) WSW of Puente Alto (pop: 510,400) | Show on map | Quakes nearby |
| Estimated seismic energy released | 2.2 x 1010 joules (6.22 megawatt hours, equivalent to 5.35 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 |
| 3.7 | 18 km | 51 Km Al NO De Pichilemu | GUG (U. Chile) |
| 3.7 | 30 km | OFFSHORE O'HIGGINS, CHILE | EMSC |
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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