M6.8 Earthquake 86 km NW of Vallenar, Chile — September 1, 2020
2020-09-01 04:09:28 UTC (2020-09-01) · approx. 11:09 PM UTC-5 local
Felt by 204 people across surrounding communities. Maximum shaking intensity MMI 6.8 (very strong).
On September 1, 2020 at 04:09 UTC, a magnitude 6.8 shallow crustal earthquake struck 86 km NW of Vallenar, Chile, at a depth of 21.0 km and coordinates -27.9686°, -71.3062°. The earthquake was reported felt by 204 peopleacross surrounding communities, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 6.8 (very strong). 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 44,895).
Physical scale: An earthquake of magnitude 6.8 releases seismic energy equivalent to roughly 239 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 30 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
What the Shaking Felt Like
At MMI 6.8 (very strong), people in the most strongly affected areas would have experienced: Strong shaking felt by everyone. Heavy furniture may move. Books fall from shelves. Plaster and chimneys may crack. Damage is generally slight in well-built structures.
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
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 204 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
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 | 281,248 |
| MMI 4 | light | 629,753 |
| MMI 5 | moderate | 164,031 |
| MMI 6 | strong | 16,527 |
| MMI 7 | very strong | 683 |
Earthquake Details
-71.3062°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 6.8 earthquake near Vallenar, Chile?
The magnitude 6.8 earthquake that struck 86 km NW of Vallenar, Chile on September 1, 2020 at 04:09 UTC had a depth of 21.0 km. It was felt by 204 people with maximum shaking intensity of MMI 6.8 (very strong). For context, this was a strong earthquake capable of causing significant damage.
Where did the earthquake occur?
The earthquake epicenter was located at -27.9686°, -71.3062°, which is 86 km NW of Vallenar, Chile. The nearest populated place is Vallenar (population 44,895). View all earthquakes in Chile.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 6.8 earthquakes can continue for weeks to months 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 6.8 event is significantly smaller than that historical record.
Actions
Location
Authoritative source: USGS event page (event ID: us7000bfjr). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, September 1, 2020). M6.8 Earthquake 86 km NW of Vallenar, Chile — September 1, 2020. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000bfjr/