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United States · California

M4.5 Earthquake near Trinity County, California (United States)

UTC time: 2026-08-05 22:21:58 UTC Local time: —
Earthquake newsQuakeMap24
Archive record · original publication time was not recorded Content updated:

Automatically generated from measurement data by QuakeMap24. Values may change after further analysis.

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About this earthquake

On August 5, 2026 at 22:21 UTC, a magnitude M4.5 earthquake occurred near Trinity County, California (United States). The hypocenter lay relatively close to the surface at around 9 km, increasing how strongly it was felt. Tremors of this size are distinctly felt and can occasionally cause light damage.

The event was recorded by USGS. United States: over the past 24 hours, QuakeMap24 logged 185 earthquakes, the strongest at M3.0.

Details

ID
e140b1d6682b0c9310bec6621949ea7b79c356b7
Magnitude
M4.5
Depth
9.0 km
UTC time
2026-08-05 22:21:58 UTC
Local time
—
Country
United States
State
California
City
Trinity County
County
Trinity County
Source
usgs
Coordinates
40.02560, -123.45080
Temperature
35.8°C

Depth profile

Depth profile Depth: 9 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 9 km
Shallow
9 km
9 km — shallower than the regional average (15.2 km)
Regional average: 15.2 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

Official USGS aftershock forecast

Probability of at least one aftershock at or above the specified magnitude during the entire stated time window. This does not predict an individual earthquake.

Issued: Sep 16, 2026, 10:21 PM UTC · Last checked: Sep 21, 2026, 10:22 PM UTC

Sep 16, 2026, 11:00 PM UTC – Sep 17, 2026, 11:00 PM UTC · Expired
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.00.07 %0–0
M ≥ 4.0< 0.01 %0–0
M ≥ 5.0< 0.01 %0–0
M ≥ 6.0< 0.01 %0–0
M ≥ 7.0< 0.01 %0–0
Sep 16, 2026, 11:00 PM UTC – Sep 23, 2026, 11:00 PM UTC
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.00.46 %0–0
M ≥ 4.00.05 %0–0
M ≥ 5.0< 0.01 %0–0
M ≥ 6.0< 0.01 %0–0
M ≥ 7.0< 0.01 %0–0
Sep 16, 2026, 11:00 PM UTC – Oct 16, 2026, 11:00 PM UTC
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.01.56 %0–0
M ≥ 4.00.16 %0–0
M ≥ 5.00.02 %0–0
M ≥ 6.0< 0.01 %0–0
M ≥ 7.0< 0.01 %0–0
Sep 16, 2026, 11:00 PM UTC – Sep 16, 2027, 11:00 PM UTC
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.05.57 %0–1
M ≥ 4.00.59 %0–0
M ≥ 5.00.06 %0–0
M ≥ 6.0< 0.01 %0–0
M ≥ 7.0< 0.01 %0–0

The range is the 95% forecast interval for the number of earthquakes. Magnitude thresholds and time windows overlap: do not add the values. Windows already in progress still refer to the entire stated period.

Source: USGS — Operational Aftershock Forecast

Estimated impact

Green No or minimal impact expected.
120 Felt reports · max reported intensity 3.8

Ground shaking

V
Moderate · Intensity (MMI) V
Felt by all, slight damage possible.

Tectonic context

Located on the North America Plate.
Near the boundary North America ↔ Pacific · about 61 km away

Volcanoes nearby

  • Clear Lake Volcanic Field
    Distance: 131 km ·Volcanic field ·Elevation: 1'439 m ·United States
  • Lassen Volcanic Center
    Distance: 173 km ·Stratovolcano ·Elevation: 3'187 m ·Last eruption: 1917 ·United States
  • Shasta
    Distance: 187 km ·Stratovolcano ·Elevation: 4'317 m ·Last eruption: 1250 ·United States
  • Medicine Lake
    Distance: 238 km ·Shield ·Elevation: 2'412 m ·Last eruption: 1060 ·United States
  • Crater Lake
    Distance: 343 km ·Caldera ·Elevation: 2'487 m ·Last eruption: -2850 ·United States
  • Escanaba Segment
    Distance: 358 km ·Fissure vent(s) ·Elevation: -1'700 m ·Last eruption: -2260 ·United States

California

Context for this earthquake

21 Sep 2025 – 21 Sep 2026 · M ≥ 3.0 · 241 Catalogue entries

Sufficiently reliable matching data are not currently available for a direct comparison. The area profile shows the available records and their limitations.

Open seismic profile

Historic earthquake map · United States

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Explore recent and long-term earthquake activity in this country. Use filters to narrow down by magnitude, depth, and date range.

Country statistics · United States

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