M5.1 Earthquake in the South Sandwich Islands region — July 7, 2021
2021-07-07 18:24:18 UTC (2021-07-07) · approx. 4:24 PM UTC-2 local
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On July 7, 2021 at 18:24 UTC, a magnitude 5.1 shallow crustal earthquake struck in the South Sandwich Islands region, at a depth of 10.0 km and coordinates -55.8803°, -26.4976°.0
Physical scale: An earthquake of magnitude 5.1 releases seismic energy equivalent to roughly 674 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.0 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in South Sandwich Islands, a region characterized by the South Sandwich Trench, one of Earth's most remote subduction zones.
Learn more: Magnitude scale · Aftershock sequences
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from submitted 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
Earthquake Details
-26.4976°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.1 earthquake in the South Sandwich Islands region?
The magnitude 5.1 earthquake that struck in the South Sandwich Islands region on July 7, 2021 at 18:24 UTC had a depth of 10.0 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at -55.8803°, -26.4976°, which is in the South Sandwich Islands region.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.1 earthquakes can continue for days to weeks and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us6000esyn). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, July 7, 2021). M5.1 Earthquake in the South Sandwich Islands region — July 7, 2021. Retrieved September 10, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000esyn/