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M0.4 Depth: 17.5 km

M0.4 Earthquake near 9 km SW of Idyllwild, CA (United States)

UTC time: 2025-12-21 02:40:35 UTC Local time: —

About this earthquake

A magnitude M0.4 earthquake was recorded near 9 km SW of Idyllwild, CA (United States) on December 21, 2025 at 02:40 UTC. The hypocenter lay relatively close to the surface at around 18 km, increasing how strongly it was felt. Earthquakes of this small magnitude are usually barely noticeable and cause no damage.

The event was recorded by USGS. United States: 227 earthquakes were recorded in the past 24 hours, the strongest reaching M6.0.

Details

Magnitude
M0.4
Depth
17.5 km
UTC time
2025-12-21 02:40:35 UTC
Local time
—
Country
United States
City
California
Source
usgs
Coordinates
33.68117, -116.78817
Temperature
12.8°C

Map

Depth profile

Depth profile Depth: 17.5 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 17.5 km
Shallow
17.5 km
17.5 km — close to the regional average (15.7 km)
Regional average: 15.7 km
Why depth matters

Shallow quakes release energy near the surface — shaking is felt more strongly and damage potential is higher.

Depth classes per USGS

Volcanoes nearby

  • Salton Buttes
    Distance: 121 km ·Lava dome(s) ·Elevation: -40 m ·Last eruption: 210 ·United States
  • Pinacate
    Distance: 369 km ·Volcanic field ·Elevation: 1'183 m ·Mexico
  • Ubehebe Craters
    Distance: 376 km ·Maar(s) ·Elevation: 752 m ·Last eruption: -150 ·United States
  • Uinkaret Field
    Distance: 448 km ·Volcanic field ·Elevation: 1'555 m ·Last eruption: 1100 ·United States
  • San Luis, Isla
    Distance: 470 km ·Tuff cone ·Elevation: 183 m ·Last eruption: -1141 ·Mexico
  • Mammoth Mountain
    Distance: 484 km ·Lava dome(s) ·Elevation: 3'369 m ·Last eruption: 1260 ·United States

Historic earthquake map · United States

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Country statistics · United States

Country overview
View earthquake KPIs, strongest and latest events, and averages for this country.

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