EARTHQUAKES · MARTIN AREA · TX2021SGCM
Magnitude 3.4 30 km E of McKinney Acres, Texas
Friday, September 17, 2021, 6:42:48 AM Central · 2021-09-17 11:42:48 UTC
A magnitude 3.4 earthquake 30 km E of McKinney Acres, Texas on September 17, 2021 at 6:42 AM Central, 5.6 km deep, in the Martin County area.
It is one of 16 M2+ events located within 10 km of this spot, 4 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 1.4 km away and operated by High Lonesome Midstream, LLC; together they hold 140,000 barrels a day of permitted capacity.
18 of the nearby wells report daily to TexNet; they injected 41,989 barrels a day in August 2026.
- M3.4
- ML, reviewed
- 5.6
- km deep · 18,374 ft
- 4
- M2+ within 10 km, prior 30 days
- 16
- M2+ within 10 km, all time
- 15
- active injection wells within 10 km
- 842
- permitted wells within 10 km
Location
- Epicenter
- 32.2733, -102.2029
- County area
- Martin County
- On a map
- Google Maps ↗
- Catalog
- USGS event page ↗ · TexNet catalog ↗
Around it in time and space
M2+ events within 10 km, nearest in time first.
| When | Mag | Distance | Depth |
|---|---|---|---|
| Sep 16, 2021, 6:51 AM | 2.9 | 1 km | 6.1 km |
| Sep 11, 2021, 12:10 PM | 2.2 | 1.7 km | 9.2 km |
| Aug 30, 2021, 6:59 AM | 2.9 | 1.1 km | 11.0 km |
| Aug 30, 2021, 6:56 AM | 2.2 | 1 km | 8.0 km |
| Apr 2, 2022, 1:13 AM | 2.1 | 6.6 km | 5.5 km |
| Dec 26, 2020, 8:50 PM | 2.3 | 0.6 km | 5.0 km |
| Dec 16, 2022, 10:59 PM | 2.6 | 9.5 km | 8.0 km |
| Dec 19, 2022, 3:42 AM | 2.3 | 9.6 km | 5.6 km |
| Mar 7, 2023, 8:15 AM | 2.7 | 8.6 km | 9.6 km |
| Sep 10, 2024, 7:44 PM | 2.1 | 1.1 km | 9.8 km |
| Sep 12, 2024, 2:35 AM | 2.2 | 1 km | 9.9 km |
| Jan 21, 2025, 4:27 AM | 2.0 | 9.1 km | 7.1 km |
Largest nearby on record: M2.9 on Sep 16, 2021.
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. 18 of these report daily to TexNet: 42K bbl/d in Aug 2026.
| Well | Operator | UIC no. | Distance | Permitted, bbl/d | Injection zone, ft |
|---|---|---|---|---|---|
| Mabee G SWD #D 1 | High Lonesome Midstream, LLC | 000110124 | 1.4 km | 20,000 | 4,800–5,550 |
| Mabee 6 SWD #1 | High Lonesome Midstream, LLC | 000116306 | 1.4 km | 30,000 | 4,700–6,850 |
| Mabee Unit #A462W | Scout Energy Management LLC | 000041079 | 2.1 km | 2,000 | 4,742–4,774 |
| Mabee 5 SWD #1 | High Lonesome Midstream, LLC | 000116014 | 2.8 km | 30,000 | 4,850–6,850 |
| Mabee Unit #A453W | Scout Energy Management LLC | 000017248 | 2.8 km | 2,000 | 4,708–4,772 |
| Mabee 240 #1SW | High Lonesome Midstream, LLC | 000099215 | 2.9 km | 20,000 | 4,850–6,850 |
| Mabee Unit #A450W | Scout Energy Management LLC | 000017245 | 3 km | 2,000 | 4,690–4,770 |
| Mabee Unit #494W | Scout Energy Management LLC | 000017211 | 3.3 km | 2,000 | 4,400–4,742 |
| Mabee Unit #503W | Scout Energy Management LLC | 000017220 | 3.3 km | 2,000 | 4,714–4,791 |
| Mabee Unit #501W | Scout Energy Management LLC | 000017218 | 3.5 km | 2,000 | 4,400–4,776 |
| Mabee Unit #387W | Scout Energy Management LLC | 000017130 | 3.6 km | 2,000 | 4,667–4,742 |
| Mabee Unit #384W | Scout Energy Management LLC | 000017128 | 3.6 km | 2,000 | 4,400–4,736 |
| Mabee Unit #498W | Scout Energy Management LLC | 000017215 | 3.7 km | 2,000 | 4,686–4,748 |
| Mabee 239 #1SW | High Lonesome Midstream, LLC | 000111185 | 3.7 km | 20,000 | 4,850–6,850 |
| Mabee Unit #492W | Scout Energy Management LLC | 000017209 | 3.9 km | 2,000 | 4,400–4,763 |
Disposal in Martin County → · How disposal permits and volumes work →
About this data
Event tx2021sgcm from the USGS earthquake catalog, located by TexNet (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/tx2021sgcm, documented in the API reference.