Weak mag. 3.4 earthquake - South Pacific Ocean, 87 km southwest of San Antonio, Region de Valparaiso, Chile, on Friday, April 23, 2021 at 13:19 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 13 hours earlier.
Quake Data | Interactive map | User Reports | Earlier quakes here | Quakes in Chile | Region de Valparaiso | Santiago | O'Higgins | Maule Region


Weak magnitude 3.4 earthquake at 32 km depth
23 Apr 13:38 UTC: First to report: GUG (U. Chile) after 18 minutes.
23 Apr 22:32: Hypocenter depth recalculated from 20.0 to 32.3 km (from 12.4 to 20 mi). Epicenter location corrected by 1.3 km (0.8 mi) towards WNW.
23 Apr 22:32: Hypocenter depth recalculated from 20.0 to 32.3 km (from 12.4 to 20 mi). Epicenter location corrected by 1.3 km (0.8 mi) towards WNW.
Earthquake details
Date & time | Apr 23, 2021 13:19:50 UTC - |
Local time at epicenter | |
Status | Confirmed |
Magnitude | 3.4 |
Depth | 32.3 km |
Epicenter latitude / longitude | 34.044°S / 72.378°W ![]() |
Antipode | 34.044°N / 107.622°E |
Shaking intensity | Very weak shaking |
Felt | 0 reports |
Primary data source | GUG (U. Chile) |
Nearest volcano | Palomo (200 km / 124 mi) |
Nearby towns and cities | 87 km (54 mi) SW of San Antonio (pop: 85,700) | Show on map | Quakes nearby 90 km (56 mi) SW of Cartagena (San Antonio) (pop: 16,900) | Show on map | Quakes nearby 114 km (71 mi) WSW of Melipilla (pop: 63,100) | Show on map | Quakes nearby 132 km (82 mi) SSW of Valparaiso (pop: 282,400) | Show on map | Quakes nearby 137 km (85 mi) SSW of Viña del Mar (pop: 294,600) | Show on map | Quakes nearby 141 km (87 mi) SW of Quilpué (pop: 130,300) | Show on map | Quakes nearby 151 km (94 mi) W of Rancagua (pop: 212,700) | Show on map | Quakes nearby 167 km (104 mi) NNW of Talca (pop: 197,500) | Show on map | Quakes nearby 173 km (107 mi) WSW of Santiago de Chile (pop: 4,837,300) | Show on map | Quakes nearby |
Estimated seismic energy released | 7.9 x 109 joules (2.21 megawatt hours, equivalent to 1.9 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 |
3.4 | 32 km | 50 Km Al NO De Pichilemu | GUG (U. Chile) |
3.4 | 20 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
Click here to search our database for earlier earthquakes in the same area since 1900!