How strong was the 15 km NNW of Susanville, CA earthquake?
The 15 km NNW of Susanville, CA earthquake had a magnitude of 4.92 mw, classified as a "Light" earthquake on the magnitude scale. Earthquakes of this magnitude are typically felt by people nearby but rarely cause significant structural damage.
Where exactly did this earthquake occur and how deep was it?
This earthquake struck at coordinates 40.5443N, 120.6923W, at a depth of 5.3 km. Shallow earthquakes (under 20 km) tend to cause more surface damage than deeper events.
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?
625 people submitted felt reports to the USGS for this earthquake. The Community Decimal Intensity (CDI) reached 6.7, indicating strong to very strong shaking with potential for damage. The Modified Mercalli Intensity (MMI) was estimated at 6.6.
When did this earthquake happen and how significant was it?
This earthquake occurred on December 31, 2025 at 14:49:32. The USGS assigned it a significance score of 791 out of a possible 3,000, which factors in magnitude, felt reports, and potential impact. This is a moderately significant seismic event. The PAGER alert level was "green", indicating the estimated level of response needed.