M5.1 Earthquake 204 km WSW of Port McNeill, Canada — April 18, 2024
2024-04-18 06:06:04 UTC (2024-04-18) · approx. 9:06 PM UTC-9 local
Felt by 2 people across nearby locations. Aftershock of the M5.2 mainshock.
On April 18, 2024 at 06:06 UTC, a magnitude 5.1 shallow crustal earthquake struck 204 km WSW of Port McNeill, Canada, at a depth of 10.0 km and coordinates 50.2411°, -129.9156°. This earthquake was detected by 61 seismic stations with good location accuracy and was assigned a USGS significance rating of 401, placing it among routine seismic activity.
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.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.2 mainshock that occurred 14 days ago 190 km WSW of Port McNeill, Canada. Since the mainshock, the USGS has recorded 1 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 2 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
-129.9156°E
Technical Information
Common Questions
How strong was the magnitude 5.1 earthquake near Port McNeill, Canada?
The magnitude 5.1 earthquake that struck 204 km WSW of Port McNeill, Canada on April 18, 2024 at 06:06 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 50.2411°, -129.9156°, which is 204 km WSW of Port McNeill, Canada.
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.
Is this the same earthquake as the M5.2 one earlier?
No. This magnitude 5.1 earthquake is an aftershock of the larger magnitude 5.2 mainshock that occurred earlier 190 km WSW of Port McNeill, Canada. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
Authoritative source: USGS event page (event ID: us7000mctr). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, April 18, 2024). M5.1 Earthquake 204 km WSW of Port McNeill, Canada — April 18, 2024. Retrieved June 26, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000mctr/