Earthquake · reviewed by a seismologist
M 4.0mwr
Earthquake near Karnes City, TX
Yes: an earthquake was likely felt in Karnes City in the last 24 hours. M 3.1, 101 km (63 mi) W of Karnes City, at 3:20 am CST on 12 November 2026 (09:20 UTC); the estimated shaking in Karnes City was intensity II (weak). 1 person has reported feeling it to USGS. Every earthquake near Karnes City
This page: a magnitude 4.0 earthquake was recorded 12 km (7 mi) northwest of Karnes City, TX, at 11:28 am CDT on 1 May 2018 (16:28 UTC), 5.0 km deep. 15 people have reported feeling it to USGS.
USGS: 4 km SSE of Falls City, Texas
77 km (48 mi) SE of San Antonio, TX
- When
- 11:28 am CDT on 1 May 2018 ()
- Where
- 12 km (7 mi) northwest of Karnes City, TX · earthquakes near Karnes City
- Texas today
- every earthquake in Texas in the last 24 hours
- Magnitude
- M 4.0 (mwr)
- Depth
- 5.0 km below the surface
- Felt
- 15 reports · strongest reported intensity IV
- Measured shaking
- intensity IV (ShakeMap)
- USGS impact alert
- green
- Nearest
- Karnes County, 15 km ESE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 499 days ago
Earthquake alerts for Karnes City, TX
Get a notification in this browser when USGS records an earthquake near Karnes City, TX. 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 light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.
At this magnitude and depth, people at rest would likely notice it out to about 461 km (286 mi) from the epicentre. In Karnes City, 12 km away, the estimate is intensity IV (light). 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.
Likely felt in: Karnes City 12 km, intensity IV · Floresville 26 km, intensity IV · Stockdale 32 km, intensity IV · Nixon 42 km, intensity III · Pleasanton 46 km, intensity III · Yorktown 49 km, intensity III. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 15 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 11,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 500× the energy of this one
- Magna, Utah 2020 M 5.7 350× the energy of this one
- This earthquake M 4.0 about 15 tons of TNT
- Around the size people start to feel M 3.0 this one released 32× more
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 (31 mi) since our catalogue begins in 2016. No other earthquake of M4 or more has been recorded this close in that time.
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 28.9476, -98.0015. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Karnes County, TX | 15 km (9 mi) | ESE | earthquakes near Karnes County |
| Wilson County, TX | 26 km (16 mi) | NNW | earthquakes near Wilson County |
| Atascosa County, TX | 52 km (33 mi) | W | earthquakes near Atascosa County |
| DeWitt County, TX | 64 km (40 mi) | ENE | earthquakes near DeWitt County |
| Goliad County, TX | 64 km (40 mi) | ESE | earthquakes near Goliad County |
| Bee County, TX | 64 km (40 mi) | SSE | earthquakes near Bee County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
54 earthquakes have been recorded within 50 km since this one.
- 1.5 19 km NNE of Karnes City, Texas
- 1.7 19 km SW of Falls City, Texas
- 2.2 17 km S of Smiley, Texas
- 2.2 17 km S of Smiley, Texas
- 1.6 7 km E of Falls City, Texas
- 2.0 16 km SSE of Nixon, Texas
- 1.7 15 km ENE of Falls City, Texas
- 2.9 14 km NNW of Yorktown, Texas
- 1.9 11 km S of Smiley, Texas
- 1.5 17 km S of Nixon, Texas
- 2.1 15 km SSE of Nixon, Texas
- 1.7 14 km SSW of Nixon, Texas
- 2.6 19 km S of Nixon, Texas
- 1.8 11 km SSE of Smiley, Texas
- 1.9 10 km SSE of Smiley, 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.