How strong was the 27 km SSE of Naalehu, Hawaii earthquake?
The 27 km SSE of Naalehu, Hawaii earthquake had a magnitude of 6.21 ml, classified as a "Strong" earthquake on the magnitude scale. Earthquakes of this size can cause serious damage to buildings and infrastructure over a wide area.
Where exactly did this earthquake occur and how deep was it?
This earthquake struck at coordinates 18.8203N, 155.5272W, at a depth of 35.1 km. This intermediate depth can still produce significant shaking at the surface.
Did this earthquake trigger a tsunami warning?
No tsunami warning was issued for this earthquake. Earthquakes below magnitude 6.5 rarely generate dangerous tsunamis, though localized effects are possible in rare cases.
How many people felt this earthquake?
3,487 people submitted felt reports to the USGS for this earthquake. The Community Decimal Intensity (CDI) reached 5.8, indicating moderate shaking felt by most people indoors. The Modified Mercalli Intensity (MMI) was estimated at 6.7.
When did this earthquake happen and how significant was it?
This earthquake occurred on October 11, 2021 at 06:48:36. The USGS assigned it a significance score of 1173 out of a possible 3,000, which factors in magnitude, felt reports, and potential impact. This is considered a highly significant seismic event. The PAGER alert level was "green", indicating the estimated level of response needed.