quarry blast · reviewed by a seismologist
M 1.8md
Earthquake near Bonadelle Ranchos-Madera Ranchos, CA
No earthquake was likely felt in Bonadelle Ranchos-Madera Ranchos in the 24 hours to 11:33 pm PST (07:33 UTC). The last one was M 1.7, 7 km (4 mi) ENE, at 1:22 pm PDT on 17 August 2026, estimated intensity II (weak) in town. Every earthquake near Bonadelle Ranchos-Madera Ranchos
No: USGS classifies this as a quarry blast, not an earthquake. A magnitude 1.8 quarry blast was recorded 6 km (3 mi) east-northeast of Bonadelle Ranchos-Madera Ranchos, CA, at 12:23 pm PDT on 20 March 2025 (19:23 UTC), less than 1 km deep.
USGS: 6 km E of Bonadelle Ranchos-Madera Ranchos, CA
24 km (15 mi) N of Fresno, CA · 23 km (14 mi) NNW of Clovis, CA
- When
- 12:23 pm PDT on 20 March 2025 ()
- Where
- 6 km (3 mi) east-northeast of Bonadelle Ranchos-Madera Ranchos, CA · earthquakes near Bonadelle Ranchos-Madera Ranchos
- Magnitude
- M 1.8 (md)
- Depth
- -0.1 km below the surface
- Felt
- no reports yet
- Nearest
- Madera County, 24 km NNE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 601 days ago
Earthquake alerts for Bonadelle Ranchos-Madera Ranchos, CA
Get a notification in this browser when USGS records an earthquake near Bonadelle Ranchos-Madera Ranchos, 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 14 km (9 mi) from the epicentre. In Bonadelle Ranchos-Madera Ranchos, 6 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: Parksdale, Yosemite Lakes, Parkwood, Clovis, Madera, Madera Acres.
USGS catalogues this as quarry blast, not an earthquake.
How big was it?
This earthquake released about 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 870,000× the energy of this one
- Magna, Utah 2020 M 5.7 620,000× the energy of this one
- Around the size people start to feel M 3.0 55× the energy of this one
- This earthquake M 1.8 about 17 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 37.0017, -119.8157. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Madera County, CA | 24 km (15 mi) | NNE | earthquakes near Madera County |
| Fresno County, CA | 30 km (19 mi) | SSE | earthquakes near Fresno County |
| Mariposa County, CA | 64 km (40 mi) | N | earthquakes near Mariposa County |
| Merced County, CA | 83 km (52 mi) | WNW | earthquakes near Merced County |
| Kings County, CA | 103 km (64 mi) | S | earthquakes near Kings County |
| Tuolumne County, CA | 114 km (71 mi) | N | earthquakes near Tuolumne County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 2.1 9 km E of Friant, CA
- 2.4 4 km SSE of Shaver Lake, CA
- 2.2 3 km S of Shaver Lake, CA
- 2.0 9 km ESE of Coarsegold, CA
- 2.5 14 km NNW of Squaw Valley, CA
- 2.0 7 km ENE of Bonadelle Ranchos-Madera Ranchos, CA
- 1.8 6 km ENE of Bonadelle Ranchos-Madera Ranchos, CA
- 1.7 8 km ESE of Coarsegold, CA
- 2.7 8 km NW of Yosemite Lakes, CA
- 2.1 11 km S of Yosemite Lakes, CA
- 1.9 6 km ENE of Bonadelle Ranchos-Madera Ranchos, CA
- 2.2 15 km SSW of Fairmead, CA
- 1.7 6 km ENE of Bonadelle Ranchos-Madera Ranchos, CA
- 2.2 17 km NW of Yosemite Lakes, CA
- 2.1 12 km NNW 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.