Event status: disregarded [?]

Reported seismic-like event (likely no quake): 1.7 mi southwest of Pomona, Los Angeles County, California, USA, Sep 20, 2021 7:40 am (GMT -7) -

Reported seismic-like event (likely no quake): 1.7 mi southwest of Pomona, Los Angeles County, California, USA, Sep 20, 2021 7:40 am (GMT -7)
20 Sep 14:42 UTC: First to report: VolcanoDiscovery after 2 minutes.
Date & time: Sep 20, 2021 14:40:16 UTC -
Local time at epicenter: Monday, Sep 20, 2021 7:40 am (GMT -7)
Magnitude: 3?
Depth: 10.0 km
Epicenter latitude / longitude: 34.03705°N / 117.77213°W (Los Angeles, California, United States)
Antipode: 34.037°S / 62.228°E
Nearest volcano: Lavic Lake (132 km / 82 mi)
Nearby towns and cities:
3 km (2 mi) SW of Pomona (pop: 153,300) --> See nearby quakes!
4 km (2 mi) ENE of Diamond Bar (pop: 56,900) --> See nearby quakes!
5 km (3 mi) NNW of Chino Hills (pop: 78,300) --> See nearby quakes!
5 km (3 mi) NNW of Chino Hills (pop: 78,300) --> See nearby quakes!
12 km (7 mi) WSW of Ontario (pop: 171,200) --> See nearby quakes!
13 km (8 mi) WSW of Upland (pop: 76,400) --> See nearby quakes!
16 km (10 mi) ESE of West Covina (pop: 108,500) --> See nearby quakes!
18 km (11 mi) WSW of Rancho Cucamonga (pop: 175,200) --> See nearby quakes!
49 km (30 mi) NE of Long Beach (pop: 474,100) --> See nearby quakes!
606 km (376 mi) SE of Sacramento (pop: 490,700) --> See nearby quakes!
Weather at epicenter at time of quake:
Haze 16.6°C (62 F), humidity: 75%, wind: 0 m/s (0 kts)
Primary data source: VolcanoDiscovery
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User reports for this quake (2)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Pomona, Los Angeles, California (0 km SE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 1-2 s : The room started to shake  
Naples island Long Beach. / Light shaking (MMI IV) / rattling, vibrating / 1-2 s
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