Light mag. 4.0 earthquake - South Pacific Ocean, 87 km southwest of San Antonio, Region de Valparaiso, Chile, on 22 Apr 6:29 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 10 hours earlier.
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Light magnitude 4.0 earthquake at 36 km depth
22 Apr 10:46 UTC: First to report: EMSC after 17 minutes.
22 Apr 10:50: Now using data updates from GUG (U. Chile)
22 Apr 12:10: Hypocenter depth recalculated from 20.1 to 36.1 km (from 12.5 to 22 mi). Epicenter location corrected by 2 km (1.2 mi) towards SW.
22 Apr 10:50: Now using data updates from GUG (U. Chile)
22 Apr 12:10: Hypocenter depth recalculated from 20.1 to 36.1 km (from 12.5 to 22 mi). Epicenter location corrected by 2 km (1.2 mi) towards SW.
Earthquake details
| Date & time | Apr 22, 2021 10:29:02 UTC - |
| Local time at epicenter | 22 Apr 6:29 am (GMT -4) |
| Status | Confirmed |
| Magnitude | 4 |
| Depth | 36.1 km |
| Epicenter latitude / longitude | 34.053°S / 72.366°W  (South Pacific Ocean, Chile) |
| Antipode | 34.053°N / 107.634°E |
| Shaking intensity | Weak shaking near epicenter |
| Felt | 0 reports |
| Primary data source | GUG (U. Chile) |
| Nearest volcano | Palomo (199 km / 124 mi) |
| Nearby towns and cities | 87 km (54 mi) SW of San Antonio (pop: 85,700) | Show on map | Quakes nearby 89 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 150 km (93 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 172 km (107 mi) WSW of Santiago de Chile (pop: 4,837,300) | Show on map | Quakes nearby 173 km (107 mi) WSW of Puente Alto (pop: 510,400) | Show on map | Quakes nearby |
| Weather at epicenter at time of quake | Broken Clouds  14.1°C (57 F), humidity: 83%, wind: 9 m/s (17 kts) from SSW |
| Estimated seismic energy released | 6.3 x 1010 joules (17.5 megawatt hours, equivalent to 15.1 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 |
| 4.0 | 36 km | 49 Km Al NO De Pichilemu | GUG (U. Chile) |
| 4.4 | 10 km | OFFSHORE O'HIGGINS, CHILE | EMSC |
| 4.3 | 26 km | Near Coast of Central Chile | GFZ |
| 4.4 | 10 km | 87 Km WSW of San Antonio, Chile | USGS |
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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