EARTHQUAKES · HOWARD AREA · TX2023SIYR

Magnitude 2.3 9 km WSW of Westbrook, Texas

Monday, September 18, 2023, 8:10:41 PM Central · 2023-09-19 01:10:41 UTC

A magnitude 2.3 earthquake 9 km WSW of Westbrook, Texas on September 18, 2023 at 8:10 PM Central, 8.7 km deep, in the Howard County area.

It is one of 44 M2+ events located within 10 km of this spot, none in the thirty days before it; the largest nearby was M4.3.

15 active injection or disposal wells sit within 10 km, the nearest 0.8 km away and operated by Basa Resources, Inc.; together they hold 15,100 barrels a day of permitted capacity.

M2.3: ML, reviewed
8.7: km deep · 28,644 ft
0: M2+ within 10 km, prior 30 days
44: M2+ within 10 km, all time
15: active injection wells within 10 km
79: permitted wells within 10 km

Location

Epicenter: 32.3172, -101.0989
County area: Howard 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 18, 2023, 10:07 PM	2.3	0.2 km	9.0 km
Oct 12, 2023, 10:27 PM	2.8	1.3 km	12.0 km
Jan 17, 2024, 8:31 PM	2.1	5.5 km	8.7 km
Mar 1, 2024, 7:11 AM	2.1	5.9 km	5.0 km
Mar 1, 2024, 10:07 AM	2.5	5 km	8.5 km
Mar 3, 2024, 3:07 AM	2.1	4.6 km	4.9 km
Feb 4, 2023, 9:41 AM	2.3	7.3 km	8.5 km
Feb 4, 2023, 5:55 AM	2.0	7.6 km	7.0 km
May 23, 2024, 3:31 PM	2.8	9.5 km	4.3 km
Jun 5, 2024, 4:45 AM	2.3	5.9 km	8.4 km
Jun 9, 2024, 10:12 AM	2.7	9.3 km	6.2 km
Jun 23, 2024, 10:06 PM	2.2	7 km	5.7 km

Largest nearby on record: M4.3 on Oct 12, 2025.

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
Biegel #7W	Basa Resources, Inc.	000090615	0.8 km	1,000	2,406–3,550
E. H. Brown -A- #57W	Basa Resources, Inc.	000097977	0.9 km	1,200	2,300–3,300
E. H. Brown -B- #47W	Basa Resources, Inc.	000090364	1.1 km	1,000	2,406–3,400
E. H. Brown -B- #43W	Basa Resources, Inc.	000090023	1.1 km	1,000	2,394–3,371
E. H. Brown -A- #44W	Basa Resources, Inc.	000090057	1.2 km	1,000	2,362–3,370
Biegel #6W	Basa Resources, Inc.	000090614	1.2 km	1,000	2,398–3,550
E. H. Brown -A- #40W	Basa Resources, Inc.	000090378	1.4 km	1,000	2,414–3,400
E. H. Brown -A- #46W	Basa Resources, Inc.	000090059	1.4 km	1,000	2,443–3,355
E. H. Brown -B- #25W	Basa Resources, Inc.	000088684	1.4 km	1,000	2,660–3,370
Westbrook Southwest Unit #4JW	Grayrock Energy II, LLC	000060298	1.5 km	700	2,300–3,300
E. H. Brown -A- #34W	Basa Resources, Inc.	000090053	1.5 km	1,000	2,510–3,405
Brennand #29W	Basa Resources, Inc.	000097941	1.6 km	1,200	2,300–3,300
E. H. Brown -A- #51W	Basa Resources, Inc.	000090380	1.6 km	1,000	2,427–3,405
E. H. Brown -A- #35W	Basa Resources, Inc.	000090054	1.6 km	1,000	2,392–3,370
E. H. Brown -A- #23W	Basa Resources, Inc.	000088682	1.7 km	1,000	2,666–3,365

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

About this data

Event tx2023siyr 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/tx2023siyr, documented in the API reference.