M3.8 Earthquake 36 km SSW of Manley Hot Springs, Alaska — June 22, 2020
2020-06-22 21:56:16 UTC (2020-06-22) · approx. 11:56 AM UTC-10 local
Felt by 24 people across nearby locations.
On June 22, 2020 at 21:56 UTC, a magnitude 3.8 shallow crustal earthquake struck 36 km SSW of Manley Hot Springs, Alaska, at a depth of 24.1 km and coordinates 64.6889°, -150.8887°. The earthquake was reported felt by 24 peopleacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 3.3 (light).
Physical scale: An earthquake of magnitude 3.8 releases seismic energy equivalent to roughly 7.6 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 252 m — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Alaska, a region characterized by Pacific Plate subduction beneath the North American Plate, producing frequent megathrust and crustal earthquakes along the Aleutian arc. The nearest mapped fault system is the Aleutian megathrust. View all earthquakes in Alaska.
Learn more: Magnitude scale · Aftershock sequences
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 24 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
-150.8887°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.8 earthquake near Manley Hot Springs, Alaska?
The magnitude 3.8 earthquake that struck 36 km SSW of Manley Hot Springs, Alaska on June 22, 2020 at 21:56 UTC had a depth of 24.1 km. It was felt by 24 people with maximum shaking intensity of MMI 3.3 (light). For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 64.6889°, -150.8887°, which is 36 km SSW of Manley Hot Springs, Alaska. View all earthquakes in Alaska.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.8 earthquakes can continue for several days and gradually diminish over time.
Has Alaska had earthquakes this big before?
The largest recorded earthquake in Alaska was the M9.2 Great Alaska earthquake of March 27, 1964. Today's magnitude 3.8 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: ak020804cj04). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, June 22, 2020). M3.8 Earthquake 36 km SSW of Manley Hot Springs, Alaska — June 22, 2020. Retrieved August 30, 2020 from https://www.earthquaketracker.org/earthquakes/event/ak020804cj04/