Earthquake · reviewed by a seismologist
M 1.5md
Earthquake near Phoenix Lake, CA
No earthquake was likely felt in Phoenix Lake in the 24 hours to 11:51 pm PST (07:51 UTC). The last one was M 5.2, 181 km (113 mi) NE, at 1:17 am PDT on 1 May 2026, estimated intensity II (weak) in town; 1,875 felt reports to USGS. Every earthquake near Phoenix Lake
This page: a magnitude 1.5 earthquake was recorded 33 km (21 mi) southeast of Phoenix Lake, CA, at 3:41 pm PDT on 11 August 2020 (22:41 UTC), 31 km deep.
USGS: 16km ESE of Groveland-Big Oak Flat, CA
- When
- 3:41 pm PDT on 11 August 2020 ()
- Where
- 33 km (21 mi) southeast of Phoenix Lake, CA · earthquakes near Phoenix Lake
- Magnitude
- M 1.5 (md)
- Depth
- 31 km below the surface
- Felt
- no reports yet
- Nearest
- Tuolumne County, 25 km NNE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2284 days ago
Earthquake alerts for Phoenix Lake, CA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth it was probably too small to be felt, even directly above it. In Phoenix Lake, 33 km away, the estimate is intensity I (not felt). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Earthquakes near other towns within 30 km: Tuolumne City, Soulsbyville, Midpines.
How big was it?
This earthquake released about 5.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,600,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
- Around the size people start to feel M 3.0 170× the energy of this one
- This earthquake M 1.5 about 5.7 lb of TNT
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 37.7995, -120.0312. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Tuolumne County, CA | 25 km (16 mi) | NNE | earthquakes near Tuolumne County |
| Mariposa County, CA | 27 km (17 mi) | SSE | earthquakes near Mariposa County |
| Calaveras County, CA | 63 km (39 mi) | NW | earthquakes near Calaveras County |
| Madera County, CA | 70 km (44 mi) | SSE | earthquakes near Madera County |
| Stanislaus County, CA | 89 km (56 mi) | WSW | earthquakes near Stanislaus County |
| Amador County, CA | 90 km (56 mi) | NW | earthquakes near Amador County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
48 earthquakes have been recorded within 50 km since this one.
- 2.2 9 km SSW of Mariposa, CA
- 2.4 11 km SSW of Mariposa, CA
- 2.0 3 km NNE of Yosemite Valley, CA
- 1.6 19 km S of Yosemite Valley, CA
- 2.1 18 km S of Yosemite Valley, CA
- 2.4 9 km SSW of Mariposa, CA
- 2.2 14 km SW of Bootjack, CA
- 2.0 9km SSW of Mariposa, CA
- 2.3 10km S of Mariposa, CA
- 2.2 9km SSW of Mariposa, CA
- 2.2 10km SSW of Mariposa, CA
- 2.0 11km S of Mariposa, CA
- 2.2 9km SSW of Mariposa, CA
- 1.6 10km SSW of Mariposa, CA
- 1.6 11km SSW of Mariposa, CA
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.