M3.2 Earthquake 21 km SSE of Honaunau-Napoopoo, Hawaii — January 29, 2021
2021-01-29 16:33:43 UTC (2021-01-29) · approx. 6:33 AM UTC-10 local
Felt by 13 people across nearby locations.
On January 29, 2021 at 16:33 UTC, a magnitude 3.2 shallow crustal earthquake struck 21 km SSE of Honaunau-Napoopoo, Hawaii, at a depth of 9.2 km and coordinates 19.2692°, -155.7997°. This earthquake was detected by 53 seismic stations with good location accuracy and was assigned a USGS significance rating of 166, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 3.2 releases seismic energy equivalent to roughly 1.1 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 104 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 13 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
-155.7997°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.2 earthquake near Honaunau-Napoopoo, Hawaii?
The magnitude 3.2 earthquake that struck 21 km SSE of Honaunau-Napoopoo, Hawaii on January 29, 2021 at 16:33 UTC had a depth of 9.2 km. For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 19.2692°, -155.7997°, which is 21 km SSE of Honaunau-Napoopoo, Hawaii. View all earthquakes in Hawaii.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.2 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 3.2 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: hv72334632). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, January 29, 2021). M3.2 Earthquake 21 km SSE of Honaunau-Napoopoo, Hawaii — January 29, 2021. Retrieved April 16, 2021 from https://www.earthquaketracker.org/earthquakes/event/hv72334632/