M5.6 Earthquake 256 km SSE of Ushuaia, Argentina — July 4, 2025
2025-07-04 15:47:45 UTC (2025-07-04) · approx. 11:47 AM UTC-4 local
Felt by 1 person across nearby locations. Aftershock of the M5.7 mainshock.
On July 4, 2025 at 15:47 UTC, a magnitude 5.6 shallow crustal earthquake struck 256 km SSE of Ushuaia, Argentina, at a depth of 10.0 km and coordinates -57.0542°, -67.4161°. The earthquake was reported felt by 1 personacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 3.5 (light). The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 91 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 483, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 5.6 releases seismic energy equivalent to roughly 4 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 4.4 km — a useful intuition for the size of the slip patch on the fault.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.7 mainshock that occurred 3 hours ago 292 km SSE of Ushuaia, Argentina. Since the mainshock, the USGS has recorded 3 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
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 1 citizen response 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 | 59 |
| MMI 4 | light | 12 |
Earthquake Details
-67.4161°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.6 earthquake near Ushuaia, Argentina?
The magnitude 5.6 earthquake that struck 256 km SSE of Ushuaia, Argentina on July 4, 2025 at 15:47 UTC had a depth of 10.0 km. It was felt by 1 person with maximum shaking intensity of MMI 3.5 (light). For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at -57.0542°, -67.4161°, which is 256 km SSE of Ushuaia, Argentina.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.6 earthquakes can continue for days to weeks and gradually diminish over time.
Is this the same earthquake as the M5.7 one earlier?
No. This magnitude 5.6 earthquake is an aftershock of the larger magnitude 5.7 mainshock that occurred earlier 292 km SSE of Ushuaia, Argentina. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
Authoritative source: USGS event page (event ID: us7000qamr). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, July 4, 2025). M5.6 Earthquake 256 km SSE of Ushuaia, Argentina — July 4, 2025. Retrieved September 12, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000qamr/