M3.0 Earthquake 99 km SE of Old Harbor, Alaska — June 12, 2021
2021-06-12 21:00:45 UTC (2021-06-12) · approx. 11:00 AM UTC-10 local
On June 12, 2021 at 21:00 UTC, a magnitude 3.0 shallow crustal earthquake struck 99 km SE of Old Harbor, Alaska, at a depth of 0.0 km and coordinates 56.5698°, -152.1499°.
Physical scale: An earthquake of magnitude 3.0 releases seismic energy equivalent to roughly 477 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 71 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-152.1499°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.0 earthquake near Old Harbor, Alaska?
The magnitude 3.0 earthquake that struck 99 km SE of Old Harbor, Alaska on June 12, 2021 at 21:00 UTC had a depth of 0.0 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.0 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak0217hx3r17). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, June 12, 2021). M3.0 Earthquake 99 km SE of Old Harbor, Alaska — June 12, 2021. Retrieved August 26, 2021 from https://www.earthquaketracker.org/earthquakes/event/ak0217hx3r17/