M3.0 Earthquake 13 km SSE of Fern Forest, Hawaii — July 21, 2020
2020-07-21 23:29:55 UTC (2020-07-21) · approx. 1:29 PM UTC-10 local
On July 21, 2020 at 23:29 UTC, a magnitude 3.0 shallow crustal earthquake struck 13 km SSE of Fern Forest, Hawaii, at a depth of 7.2 km and coordinates 19.3520°, -155.0975°.
Physical scale: An earthquake of magnitude 3.0 releases seismic energy equivalent to roughly 548 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 75 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-155.0975°E
Technical Information
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Common Questions
How strong was the magnitude 3.0 earthquake near Fern Forest, Hawaii?
The magnitude 3.0 earthquake that struck 13 km SSE of Fern Forest, Hawaii on July 21, 2020 at 23:29 UTC had a depth of 7.2 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.
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Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: hv72054482). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, July 21, 2020). M3.0 Earthquake 13 km SSE of Fern Forest, Hawaii — July 21, 2020. Retrieved September 26, 2020 from https://www.earthquaketracker.org/earthquakes/event/hv72054482/