Earthquake · reviewed by a seismologist
M 2.5md
Earthquake near Sanger, CA
USGS: 22 km NNE of Squaw Valley, California
60 km (37 mi) ENE of Fresno, CA · 49 km (30 mi) ENE of Clovis, CA
- When
- 7:20 pm PDT on 31 July 2017 ()
- Where
- 44 km (27 mi) NE of Sanger, CA · earthquakes near Sanger
- Magnitude
- M 2.5 (md)
- Depth
- 43 km below the surface
- Felt
- no reports yet
- Nearest
- Fresno County, 49 km WSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3340 days ago
A magnitude 2.5 earthquake was recorded 44 km (27 mi) NE of Sanger, CA, at 7:20 pm PDT on 31 July 2017 (02:20 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Yokuts Valley.
How big was it?
This earthquake released about 140 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
- Magna, Utah 2020 M 5.7 75,000× the energy of this one
- Around the size people start to feel M 3.0 6.7× the energy of this one
- This earthquake M 2.5 about 140 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 36.9273, -119.1490. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Fresno County, CA | 49 km (30 mi) | WSW | earthquakes near Fresno County |
| Madera County, CA | 62 km (38 mi) | WNW | earthquakes near Madera County |
| Tulare County, CA | 84 km (52 mi) | SSE | earthquakes near Tulare County |
| Mariposa County, CA | 99 km (61 mi) | NW | earthquakes near Mariposa County |
| Kings County, CA | 112 km (70 mi) | SSW | earthquakes near Kings County |
| Mono County, CA | 113 km (70 mi) | NNE | earthquakes near Mono County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
24 earthquakes have been recorded within 50 km since this one.
- 3.2 5km ESE of Shaver Lake, CA
- 2.2 11km W of Squaw Valley, CA
- 2.1 6km SSE of Shaver Lake, CA
- 2.2 10km WSW of Squaw Valley, CA
- 2.4 11km WSW of Squaw Valley, CA
- 2.0 14km E of North Fork, CA
- 2.1 7km SSE of Shaver Lake, CA
- 2.3 6km S of Shaver Lake, CA
- 2.2 6km W of Squaw Valley, CA
- 2.2 5km N of Shaver Lake, CA
- 2.2 8km SSE of Friant, CA
- 2.2 10km SE of Friant, CA
- 3.0 28km SW of Wilkerson, CA
- 2.6 6km E of Friant, CA
- 2.1 11km NNW of Orange Cove, 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.