M5.7 Earthquake 99 km NW of Vallenar, Chile — September 1, 2020
2020-09-01 10:31:52 UTC (2020-09-01) · approx. 5:31 AM UTC-5 local
Maximum shaking intensity MMI 4.4 (moderate).
On September 1, 2020 at 10:31 UTC, a magnitude 5.7 shallow crustal earthquake struck 99 km NW of Vallenar, Chile, at a depth of 22.0 km and coordinates -27.8691°, -71.3922°. The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. The nearest populated place is Vallenar (population 0).
Physical scale: An earthquake of magnitude 5.7 releases seismic energy equivalent to roughly 5 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 5.2 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Chile, a region characterized by the Peru-Chile Trench, where the Nazca Plate subducts beneath South America at 65-80 mm per year. The nearest mapped fault system is the Peru-Chile Trench. View all earthquakes in Chile.
Learn more: Magnitude scale · Aftershock sequences
Nearest Populated Places
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Population exposure (USGS PAGER)
Estimated population that experienced each level of shaking. Based on the USGS PAGER rapid impact assessment, which combines ShakeMap output with global population grids.
| Shaking intensity (MMI) | Description | Population exposed |
|---|---|---|
| MMI 3 | weak | 273,643 |
| MMI 4 | light | 17,189 |
Earthquake Details
-71.3922°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.7 earthquake near Vallenar, Chile?
The magnitude 5.7 earthquake that struck 99 km NW of Vallenar, Chile on September 1, 2020 at 10:31 UTC had a depth of 22.0 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at -27.8691°, -71.3922°, which is 99 km NW of Vallenar, Chile. The nearest populated place is Vallenar (population 0). View all earthquakes in Chile.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.7 earthquakes can continue for days to weeks and gradually diminish over time.
Has Chile had earthquakes this big before?
The largest recorded earthquake in Chile was the M9.5 Great Chilean earthquake of May 22, 1960. Today's magnitude 5.7 event is significantly smaller than that historical record.
Actions
Location
Authoritative source: USGS event page (event ID: us7000bfq3). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, September 1, 2020). M5.7 Earthquake 99 km NW of Vallenar, Chile — September 1, 2020. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000bfq3/