M6.6 Earthquake near southern East Pacific Rise — May 20, 2026
2026-05-20 17:43:01 UTC (2026-05-20) · approx. 9:43 AM UTC-8 local
Felt by 7 people across nearby locations. 0
On May 20, 2026 at 17:43 UTC, a magnitude 6.6 shallow crustal earthquake struck near southern East Pacific Rise, at a depth of 10.0 km and coordinates -55.9978°, -122.2979°.0 The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 231 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 670, making it a moderate-impact event.
Physical scale: An earthquake of magnitude 6.6 releases seismic energy equivalent to roughly 120 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 22 km — a useful intuition for the size of the slip patch on the fault.
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 7 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
-122.2979°E
Technical Information
Common Questions
How strong was the magnitude 6.6 earthquake near southern East Pacific Rise?
The magnitude 6.6 earthquake that struck near southern East Pacific Rise on May 20, 2026 at 17:43 UTC had a depth of 10.0 km. For context, this was a strong earthquake capable of causing significant damage.
Where did the earthquake occur?
The earthquake epicenter was located at -55.9978°, -122.2979°, which is near southern East Pacific Rise.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 6.6 earthquakes can continue for weeks to months and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us6000sz1d). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, May 20, 2026). M6.6 Earthquake near southern East Pacific Rise — May 20, 2026. Retrieved July 25, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000sz1d/