EARTHQUAKES · MARTIN AREA · TX2021QNCF

Magnitude 2.3 38 km ENE of McKinney Acres, Texas

Monday, August 23, 2021, 3:26:05 PM Central · 2021-08-23 20:26:05 UTC

A magnitude 2.3 earthquake 38 km ENE of McKinney Acres, Texas on August 23, 2021 at 3:26 PM Central, 10.5 km deep, in the Martin County area.

It is one of 204 M2+ events located within 10 km of this spot, 1 of them in the thirty days before it; the largest nearby was M5.1.

15 active injection or disposal wells sit within 10 km, the nearest 2.4 km away and operated by Stonehill Martin, LLC; together they hold 327,500 barrels a day of permitted capacity.

22 of the nearby wells report daily to TexNet; they injected 115,679 barrels a day in August 2026.

M2.3: ML, reviewed
10.5: km deep · 34,421 ft
1: M2+ within 10 km, prior 30 days
204: M2+ within 10 km, all time
15: active injection wells within 10 km
1,098: permitted wells within 10 km

Location

Epicenter: 32.4014, -102.1343
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
Jul 24, 2021, 11:44 PM	2.0	6.8 km	11.4 km
Sep 24, 2021, 5:56 PM	2.3	2.8 km	8.9 km
Jul 16, 2021, 7:51 AM	2.8	0.7 km	5.3 km
Jun 28, 2021, 3:01 AM	2.7	6.1 km	10.7 km
Oct 24, 2021, 6:29 PM	2.0	4.2 km	12.3 km
Jun 17, 2021, 1:07 AM	3.1	7 km	11.9 km
Jun 16, 2021, 5:06 AM	3.1	6.1 km	7.7 km
Oct 31, 2021, 6:00 PM	2.1	2.7 km	9.7 km
Nov 4, 2021, 4:53 PM	2.1	3.1 km	13.1 km
Nov 6, 2021, 1:50 PM	2.4	1 km	7.8 km
Nov 15, 2021, 6:10 PM	2.0	2.5 km	4.8 km
Nov 30, 2021, 5:48 PM	2.1	6.4 km	5.6 km

Largest nearby on record: M5.1 on Sep 17, 2024.

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. 22 of these report daily to TexNet: 116K bbl/d in Aug 2026.

Well	Operator	UIC no.	Distance	Permitted, bbl/d	Injection zone, ft
Corsica SWD 2 #2	Stonehill Martin, LLC	000126090	2.4 km	20,000	4,200–5,228
Breedlove Ursa #2D	Deep Blue Operating I LLC	000124651	2.6 km	30,000	3,988–5,308
University 7-27 SWD #D 2	Deep Blue Operating I LLC	000115339	3.8 km	40,000	12,700–14,200
University "7-15" #1D	Pioneer Natural Res. USA, Inc.	000115442	3.8 km	25,000	4,500–5,600
University SWD #D 1	Deep Blue Operating I LLC	000110114	4.5 km	20,000	4,800–5,550
Capri SWD #2	Stonehill Martin, LLC	000125986	4.6 km	20,000	4,350–5,700
Capri SWD #1	Stonehill Martin, LLC	000118229	4.7 km	30,000	4,500–5,680
Univ. 14-7 #3D	Ovintiv USA Inc.	000018943	4.8 km	7,500	4,525–5,470
State of Texas AR #2D	Deep Blue Operating I LLC	000100374	6.1 km	15,000	4,927–5,050
University -B- #2	Crosstex Services, L.L.C.	000079408	6.2 km	5,000	4,940–6,500
University 7-26 SWD #1	Deep Blue Operating I LLC	000102709	6.6 km	15,000	4,850–5,265
University 7-31B SWD #D 1	Deep Blue Operating I LLC	000117513	7.2 km	40,000	12,400–14,163
Golden Tornadoes SWD #1	Deep Blue Operating I LLC	000115975	7.5 km	30,000	12,380–13,965
Mabee J SWD #D 1	High Lonesome Midstream, LLC	000110054	8 km	20,000	4,800–5,500
Breedlove, F. D., -B- #47	Ovintiv USA Inc.	000099895	8.2 km	10,000	11,242–12,617

Disposal in Martin County → · How disposal permits and volumes work →

About this data

Event tx2021qncf 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/tx2021qncf, documented in the API reference.