Earthquake · reviewed by a seismologist
M 1.5md
Earthquake near Mammoth Lakes, CA
No earthquake was likely felt in Mammoth Lakes in the 24 hours to 5:32 pm PST (01:32 UTC). The last one was M 2.9, 26 km (16 mi) SSE, at 3:54 am PDT on 24 October 2026, estimated intensity II (weak) in town. Every earthquake near Mammoth Lakes
This page: a magnitude 1.5 earthquake was recorded 26 km (16 mi) east-southeast of Mammoth Lakes, CA, at 2:23 pm PDT on 9 August 2025 (21:23 UTC), 9.0 km deep.
USGS: 3 km N of Toms Place, CA
- When
- 2:23 pm PDT on 9 August 2025 ()
- Where
- 26 km (16 mi) east-southeast of Mammoth Lakes, CA · earthquakes near Mammoth Lakes
- Magnitude
- M 1.5 (md)
- Depth
- 9.0 km below the surface
- Felt
- no reports yet
- Nearest
- Mono County, 40 km NNW
- Nearest mapped fault
- Long Valley fault, under 1 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 454 days ago
Earthquake alerts for Mammoth Lakes, CA
Get a notification in this browser when USGS records an earthquake near Mammoth Lakes, CA. No account or email needed.
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, people at rest would likely notice it out to about 5 km (3 mi) from the epicentre. In Mammoth Lakes, 26 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.
How big was it?
This earthquake released about 5.6 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 2,700,000× 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 5.6 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
The largest earthquake within 50 km since 2016 was M 4.8 on 2016-02-16 — about 78,000 times the energy of this one.
Before 2016, the USGS record lists 43 earthquakes of M5 or more within 50 km; the five largest:
- 6.4 The 1986 Chalfant Valley, California Earthquake · 22 km ESE of this epicentre
- 6.2 9 km SW of Aspen Springs, California · 14 km SW of this epicentre
- 6.1 11 km WNW of Aspen Springs, California · 13 km W of this epicentre
- 6.1 8 km W of Aspen Springs, California · 11 km WSW of this epicentre
- 6.1 4 km NNW of Round Valley, California · 16 km SSE of this epicentre
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 37.5878, -118.6838. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Mono County, CA | 40 km (25 mi) | NNW | earthquakes near Mono County |
| Esmeralda County, NV | 95 km (59 mi) | ENE | earthquakes near Esmeralda County |
| Madera County, CA | 103 km (64 mi) | WSW | earthquakes near Madera County |
| Mineral County, NV | 106 km (66 mi) | NNE | earthquakes near Mineral County |
| Mariposa County, CA | 108 km (67 mi) | W | earthquakes near Mariposa County |
| Tuolumne County, CA | 122 km (76 mi) | WNW | earthquakes near Tuolumne County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
56 earthquakes have been recorded within 50 km since this one.
- 2.3 3 km ENE of Round Valley, CA
- 1.5 5 km WNW of Round Valley, CA
- 1.5 10 km SW of West Bishop, CA
- 2.6 20 km S of Mammoth Lakes, CA
- 1.5 19 km SSW of Mammoth Lakes, CA
- 2.2 7 km ENE of Wilkerson, CA
- 2.0 20 km SW of Toms Place, CA
- 2.2 17 km WSW of Toms Place, CA
- 2.4 1 km WSW of Wilkerson, CA
- 1.6 13 km WSW of Toms Place, CA
- 1.8 6 km NNW of Round Valley, CA
- 2.1 3 km NE of Bishop, CA
- 2.5 22 km S of Mammoth Lakes, CA
- 1.9 22 km SW of Toms Place, CA
- 1.6 22 km SW of Toms Place, 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.