EARTHQUAKES · ZAVALA AREA · TX2026ULNSOW
Magnitude 3.5 24 km WNW of Carrizo Springs, Texas
Saturday, October 17, 2026, 8:30:16 AM Central · 2026-10-17 13:30:16 UTC
A magnitude 3.5 earthquake 24 km WNW of Carrizo Springs, Texas on October 17, 2026 at 8:30 AM Central, 6.0 km deep, in the Zavala County area.
It is one of 16 M2+ events TexNet has located within 10 km of this spot, 7 of them in the thirty days before it; this is the largest of them.
15 active injection or disposal wells sit within 10 km, the nearest 6.5 km away and operated by Atlas Oper LLC; together they hold 6,730 barrels a day of permitted capacity.
- M3.5
- ML, reviewed
- 6.0
- km deep · 19,785 ft
- 7
- M2+ within 10 km, prior 30 days
- 16
- M2+ within 10 km, all time
- 15
- active injection wells within 10 km
- 50
- permitted wells within 10 km
Location
- Epicenter
- 28.6330, -100.0830
- County area
- Zavala County
- On a map
- OpenStreetMap ↗
- Catalog
- TexNet earthquake catalog ↗
Around it in time and space
M2+ events within 10 km, nearest in time first.
| When | Mag | Distance | Depth |
|---|---|---|---|
| Oct 17, 2026, 11:16 AM | 2.6 | 5.5 km | 2.2 km |
| Oct 17, 2026, 2:51 AM | 2.9 | 7.7 km | 7.8 km |
| Oct 17, 2026, 10:48 PM | 2.2 | 5.1 km | 3.9 km |
| Oct 16, 2026, 4:21 PM | 2.2 | 3.1 km | 8.7 km |
| Oct 16, 2026, 3:11 PM | 2.6 | 2.8 km | 7.6 km |
| Oct 18, 2026, 3:21 AM | 2.0 | 0.2 km | 7.7 km |
| Oct 18, 2026, 8:08 AM | 2.2 | 1 km | 6.1 km |
| Oct 18, 2026, 8:19 AM | 2.1 | 9.7 km | 7.0 km |
| Oct 16, 2026, 8:09 AM | 2.6 | 4.3 km | 5.8 km |
| Oct 16, 2026, 3:51 AM | 2.6 | 6.9 km | 8.2 km |
| Oct 16, 2026, 12:58 AM | 2.2 | 9.2 km | 3.0 km |
| Oct 14, 2026, 1:28 AM | 2.2 | 7.3 km | 5.3 km |
Largest nearby on record: M2.9 on Oct 17, 2026.
Injection wells within 10 km
RRC UIC MASTER · ACTIVE PERMITS
Proximity is not attribution. The wells are listed because the question is always asked; whether any of them is connected to this event is for the RRC's seismic response review, not this page.
| Well | Operator | UIC no. | Distance | Permitted, bbl/d | Injection zone, ft |
|---|---|---|---|---|---|
| Pena Creek Unit #38 | Atlas Oper LLC | 000043904 | 6.5 km | 600 | 2,148–2,543 |
| Pena Creek Unit #51 | Atlas Oper LLC | 000075872 | 6.5 km | 250 | 3,130–3,151 |
| Pena Creek Unit #37W | Atlas Oper LLC | 000045337 | 6.6 km | 300 | 3,120–3,180 |
| Pena Creek Unit #46W | Atlas Oper LLC | 000045548 | 6.9 km | 300 | 3,114–3,125 |
| Chittim, N. J. #1701 | Chittim Oper LLC | 000000918 | 6.9 km | 40 | 1,195–1,785 |
| Pena Creek Unit #47 | Atlas Oper LLC | 000070469 | 6.9 km | 500 | 3,140–3,196 |
| Chittim, N. J. #9908 | Chittim Oper LLC | 000001289 | 7 km | 40 | 1,195–1,785 |
| Pena Creek Unit #44W | Atlas Oper LLC | 000045336 | 7 km | 300 | 3,146–3,201 |
| Pena Creek Unit #43W | Atlas Oper LLC | 000045547 | 7.1 km | 300 | 3,117–3,133 |
| Pena Creek Unit #27W | Atlas Oper LLC | 000045386 | 7.1 km | 300 | 3,167–3,200 |
| Pena Creek Unit #72 | Atlas Oper LLC | 000099623 | 7.1 km | 500 | 3,150–3,415 |
| Chittim, N.J. #A 28W | Chittim Oper LLC | 000096123 | 7.3 km | 2,000 | 800–1,537 |
| Pena Creek Unit #62 | Atlas Oper LLC | 000099622 | 7.3 km | 500 | 3,164–3,425 |
| Pena Creek Unit #33W | Atlas Oper LLC | 000045388 | 7.3 km | 300 | 3,140–3,200 |
| Pena Creek Unit #24 | Atlas Oper LLC | 000070461 | 7.3 km | 500 | 3,162–3,284 |
Disposal in Zavala County → · How disposal permits and volumes work →
About this data
TexNet catalog event tx2026ulnsow, as published by the UT Bureau of Economic Geology and refreshed daily. Nearby wells from the RRC UIC well master and permit coordinates; daily volumes from the TexNet injection reporting tool.
Developers: this page as JSON is GET /v1/data/earthquakes/tx/events/tx2026ulnsow, documented in the API reference.