Earthquake · reviewed by a seismologist
M 1.7md
Earthquake near Ahwahnee, CA
No earthquake was likely felt in Ahwahnee in the 24 hours to 9:02 pm PST (05:02 UTC). The last one was M 2.7, 17 km (11 mi) SW, at 7:57 pm PDT on 28 April 2026, estimated intensity II (weak) in town; 25 felt reports to USGS. Every earthquake near Ahwahnee
This page: a magnitude 1.7 earthquake was recorded 10 km (6 mi) northeast of Ahwahnee, CA, at 3:51 am PDT on 6 April 2018 (10:51 UTC), 2.2 km deep.
USGS: 10km NE of Ahwahnee, CA
73 km (45 mi) N of Fresno, CA
- When
- 3:51 am PDT on 6 April 2018 ()
- Where
- 10 km (6 mi) northeast of Ahwahnee, CA · earthquakes near Ahwahnee
- Magnitude
- M 1.7 (md)
- Depth
- 2.2 km below the surface
- Felt
- no reports yet
- Nearest
- Madera County, 26 km SSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3140 days ago
Earthquake alerts for Ahwahnee, 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, people at rest would likely notice it out to about 12 km (7 mi) from the epicentre. In Ahwahnee, 10 km away, the estimate is intensity II (weak). 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: Oakhurst, Coarsegold, Midpines, Yosemite Lakes, Mariposa.
How big was it?
This earthquake released about 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
- Around the size people start to feel M 3.0 95× the energy of this one
- This earthquake M 1.7 about 10 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 37.4277, -119.6412. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Madera County, CA | 26 km (16 mi) | SSW | earthquakes near Madera County |
| Mariposa County, CA | 29 km (18 mi) | NW | earthquakes near Mariposa County |
| Tuolumne County, CA | 72 km (45 mi) | NNW | earthquakes near Tuolumne County |
| Fresno County, CA | 74 km (46 mi) | S | earthquakes near Fresno County |
| Mono County, CA | 87 km (54 mi) | NE | earthquakes near Mono County |
| Merced County, CA | 99 km (62 mi) | WSW | earthquakes near Merced 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.
- 2.1 16km SSW of Bootjack, CA
- 1.6 17km SSW of Bootjack, CA
- 1.9 17km SSW of Bootjack, CA
- 1.9 12km NNE of North Fork, CA
- 1.8 22km ESE of Yosemite Valley, CA
- 1.9 30km SE of Yosemite Valley, CA
- 1.9 30km SE of Yosemite Valley, CA
- 1.7 23km NE of North Fork, CA
- 2.0 11km SSW of Mariposa, CA
- 1.6 22km NE of Ahwahnee, CA
- 2.3 9km NNE of Oakhurst, CA
- 2.1 3km NW of Yosemite Lakes, CA
- 1.5 21km ESE of Yosemite Valley, CA
- 2.0 10km NW of Yosemite Lakes, CA
- 2.6 6km E of Friant, 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.