Minor magnitude 1.2 earthquake at 0 km depth
31 Aug 21:05 UTC: First to report: USGS after 3 minutes.
31 Aug 21:07: Magnitude recalculated from 1.4 to 1.1. Hypocenter depth recalculated from 8.9 to 6.4 km (from 5.5 to 4 mi). Epicenter location corrected by 1.4 km (0.9 mi) towards NNE.
31 Aug 21:52: Magnitude recalculated from 1.1 to 1.2. Hypocenter depth recalculated from 6.4 to 0.2 km (from 4 to 0.1 mi). Epicenter location corrected by 7.7 km (4.8 mi) towards E.
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Date & time: Aug 31, 2021 21:02:42 UTC –
Local time at epicenter: Tuesday, Aug 31, 2021 2:02 pm (GMT -7)
Magnitude: 1.2
Depth: 0.2 km
Epicenter latitude / longitude: 33.171°N / 117.16683°W↗ 
(California, United States)
Antipode: 33.171°S / 62.833°E↗
Nearest volcano: Salton Buttes (152 km / 94 mi)
Nearby towns and cities:
3 km (2 mi) N of San Marcos (pop: 92,900) –> See nearby quakes!
8 km (5 mi) ESE of Vista (pop: 100,900) –> See nearby quakes!
9 km (6 mi) NW of Escondido (pop: 151,500) –> See nearby quakes!
17 km (11 mi) E of Carlsbad (pop: 113,500) –> See nearby quakes!
19 km (12 mi) NE of Encinitas (pop: 62,900) –> See nearby quakes!
20 km (12 mi) E of Oceanside (pop: 175,700) –> See nearby quakes!
24 km (15 mi) NNW of Rancho Penasquitos (pop: 60,000) –> See nearby quakes!
24 km (15 mi) SSE of Fallbrook (pop: 30,500) –> See nearby quakes!
51 km (31 mi) N of San Diego (pop: 1,394,900) –> See nearby quakes!
101 km (63 mi) SE of Anaheim (pop: 350,700) –> See nearby quakes!
Haze
21.1°C (70 F), humidity: 82%, wind: 4 m/s (7 kts) from WPrimary data source: USGS (United States Geological Survey)
Estimated released energy: 4 x 106 joules (1.11 kilowatt hours) More info
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Data for the same earthquake reported by different agencies
Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
| Mag. | Depth | Location | Source |
| 1.2 | 0.2 km | 3km SSW of Vista, CA | USGS |
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