M2.8 Earthquake 26 km S of M?kena, Hawaii — August 13, 2021
2021-08-13 23:18:44 UTC (2021-08-13) · approx. 1:18 PM UTC-10 local
Felt by 30 people across nearby locations.
On August 13, 2021 at 23:18 UTC, a magnitude 2.8 shallow crustal earthquake struck 26 km S of M?kena, Hawaii, at a depth of 1.4 km and coordinates 20.4153°, -156.4155°. This earthquake was detected by 40 seismic stations with good location accuracy and was assigned a USGS significance rating of 134, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 2.8 releases seismic energy equivalent to roughly 274 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 55 m — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Hawaii, a region characterized by intraplate volcanic activity over the Hawaiian mantle plume hotspot, with seismicity driven by magma intrusion and flank instability. View all earthquakes in Hawaii.
Learn more: Magnitude scale · Aftershock sequences
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 30 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
-156.4155°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 2.8 earthquake near M?kena, Hawaii?
The magnitude 2.8 earthquake that struck 26 km S of M?kena, Hawaii on August 13, 2021 at 23:18 UTC had a depth of 1.4 km. For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 20.4153°, -156.4155°, which is 26 km S of M?kena, Hawaii. View all earthquakes in Hawaii.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 2.8 earthquakes can continue for several days and gradually diminish over time.
Has Hawaii had earthquakes this big before?
The largest recorded earthquake in Hawaii was the M7.9 Ka'u District earthquake of April 2, 1868. Today's magnitude 2.8 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: hv72643697). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 13, 2021). M2.8 Earthquake 26 km S of M?kena, Hawaii — August 13, 2021. Retrieved February 9, 2024 from https://www.earthquaketracker.org/earthquakes/event/hv72643697/