quarry blast · reviewed by a seismologist
M 2.7mb_lg
Earthquake near Chico, TX
No earthquake was likely felt in Chico in the 24 hours to 10:55 am CST (16:55 UTC). The last one was M 3.3, 192 km (119 mi) N, at 4:17 am CDT on 4 September 2026, estimated intensity II (weak) in town; 33 felt reports to USGS. Every earthquake near Chico
No: USGS classifies this as a quarry blast, not an earthquake. A magnitude 2.7 quarry blast was recorded 7 km (4 mi) west of Chico, TX, at 3:24 pm CST on 21 December 2018 (21:24 UTC), less than 1 km deep. 4 people have reported feeling it to USGS.
USGS: 7 km W of Chico, Texas
76 km (47 mi) NW of Fort Worth, TX
- When
- 3:24 pm CST on 21 December 2018 ()
- Where
- 7 km (4 mi) west of Chico, TX · earthquakes near Chico
- Texas today
- every earthquake in Texas in the last 24 hours
- Magnitude
- M 2.7 (mb_lg)
- Depth
- 0.0 km below the surface
- Felt
- 4 reports · strongest reported intensity III
- Nearest
- Wise County, 23 km ESE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2819 days ago
Earthquake alerts for Chico, TX
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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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 56 km (35 mi) from the epicentre. In Chico, 7 km away, the estimate is intensity III (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: Runaway Bay, Bridgeport, Alvord, Decatur, Jacksboro, Bowie.
USGS catalogues this as quarry blast, not an earthquake.
How big was it?
This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
- Magna, Utah 2020 M 5.7 32,000× the energy of this one
- Around the size people start to feel M 3.0 2.8× the energy of this one
- This earthquake M 2.7 about 340 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 33.3031, -97.8742. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Wise County, TX | 23 km (14 mi) | ESE | earthquakes near Wise County |
| Jack County, TX | 29 km (18 mi) | WSW | earthquakes near Jack County |
| Montague County, TX | 44 km (27 mi) | NNE | earthquakes near Montague County |
| Parker County, TX | 59 km (37 mi) | S | earthquakes near Parker County |
| Clay County, TX | 62 km (39 mi) | NNW | earthquakes near Clay County |
| Denton County, TX | 71 km (44 mi) | E | earthquakes near Denton County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
4 earthquakes have been recorded within 50 km since this one.
- 1.8 4 km SSE of Chico, Texas
- 1.8 9 km S of Jacksboro, Texas
- 2.2 10 km S of Jacksboro, Texas
- 2.1 1 km WSW of Chico, Texas
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.