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Light mag. 3.3 earthquake - 40 mi southeast of South Lake Tahoe, El Dorado County, California, USA, on Thursday, Jul 8, 2021 at 4:03 pm (GMT -7)

Light mag. 3.3 earthquake - 40 mi southeast of South Lake Tahoe, El Dorado County, California, USA, on Thursday, Jul 8, 2021 at 4:03 pm (GMT -7) Light mag. 3.3 earthquake - 40 mi southeast of South Lake Tahoe, El Dorado County, California, USA, on Thursday, Jul 8, 2021 at 4:03 pm (GMT -7)

Light magnitude 3.3 earthquake at 5 km depth

8 Jul 23:05 UTC: First to report: VolcanoDiscovery after 2 minutes.
8 Jul 23:07: Now using data updates from USGS
9 Jul 05:38: Magnitude recalculated from 3.5 to 3.3. Hypocenter depth recalculated from 1.7 to 4.5 km (from 1.1 to 2.8 mi). Epicenter location corrected by 1.2 km (0.8 mi) towards ENE.
Update Thu, 8 Jul 2021, 23:15

Small tremor of magnitude 3.5 just reported 40 miles southeast of South Lake Tahoe, California, United States

3.5 quake 8 Jul 4:03 pm (GMT -7)
3.5 quake 8 Jul 4:03 pm (GMT -7)
Just 12 minutes ago, a 3.5-magnitude earthquake struck near South Lake Tahoe, El Dorado County, California, USA. The tremor was recorded in the afternoon on Thursday 8 July 2021 at 4:03 pm local time, at a very shallow depth of 1.1 miles below the surface.
The event was filed by the United States Geological Survey, the first seismological agency to report it.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 3.0.
Based on the preliminary seismic data, the quake should not have caused any significant damage, but was probably felt by many people as light vibration in the area of the epicenter.
Weak shaking might have been felt in Walker (pop. 720) located 4 miles from the epicenter.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Topaz Ranch Estates (pop. 1,500) located 18 miles from the epicenter, Smith Valley (pop. 1,600) 23 miles away, Smith (pop. 1000) 25 miles away, and Gardnerville Ranchos (pop. 11,300) 31 miles away. In Gardnerville (pop. 5,700, 34 miles away), Gardnerville (pop. 5,700, 34 miles away), and South Lake Tahoe (pop. 21,700, 40 miles away), the quake was probably not felt.

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Earthquake details

Date & timeJul 8, 2021 23:03:23 UTC
Local time at epicenterThursday, Jul 8, 2021 at 4:03 pm (GMT -7)
StatusConfirmed
Magnitude3.3
Depth4.5 km
Epicenter latitude / longitude38.48383°N / 119.5135°W (Mono, California, United States)
Antipode38.484°S / 60.487°E
Shaking intensityWeak shaking
Felt23 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoMono Lake (69 km / 43 mi)
Nearby towns and cities5 km (3 mi) SW of Walker (pop: 721) | Show on map | Quakes nearby
28 km (17 mi) S of Topaz Ranch Estates (Nevada) (pop: 1,500) | Show on map | Quakes nearby
37 km (23 mi) SSW of Smith Valley (Nevada) (pop: 1,600) | Show on map | Quakes nearby
49 km (31 mi) SSE of Gardnerville Ranchos (Nevada) (pop: 11,300) | Show on map | Quakes nearby
65 km (40 mi) SE of South Lake Tahoe (El Dorado County) (pop: 21,700) | Show on map | Quakes nearby
65 km (41 mi) SSE of Johnson Lane (Douglas County, Nevada) (pop: 6,490) | Show on map | Quakes nearby
77 km (48 mi) ENE of Arnold (pop: 3,840) | Show on map | Quakes nearby
79 km (49 mi) SSE of Carson City (Nevada) (pop: 54,500) | Show on map | Quakes nearby
87 km (54 mi) NE of Phoenix Lake (pop: 4,270) | Show on map | Quakes nearby
173 km (107 mi) E of Sacramento (pop: 490,700) | Show on map | Quakes nearby
Estimated seismic energy released5.6 x 109 joules (1.56 megawatt hours, equivalent to 1.34 tons of TNT) | about seismic energy
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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.DepthLocationSource
3.34.5 km32km ENE of Dardanelle, CAUSGS
3.17 kmCENTRAL CALIFORNIAEMSC

Seismograms

Seismic station: Mammoth (MLAC/CI network) | Distance from quake: 112 km / 70 mi | Show on map | Station Info
Seismic station Mammoth: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.5-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (23)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Sonora, CA (95.3 km SW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 20-30 s : Strongest shaking first 10 - 15 seconds; leveled off to a mild shake the next 10 -15 seconds, then stopped.  
San Jose (241.6 km WSW of epicenter) [Map] / Weak shaking (MMI III) / 2-5 s : I was in my bedroom when I felt it. It shook out house and hear one noise from the wood as if it were to break.  
Elk Grove / Light shaking (MMI IV) / complex rolling (tilting in multiple directions) / 5-10 s : I don't believe there are any fault lines in the Sacramento basin, so the epicenter is a way out. Feeling shock waves.  
Fairfield,ca (227.4 km W of epicenter) [Map] / Weak shaking (MMI III) / simple rolling (tilting sideways along one direction) / 2-5 s : Slight  
Tulare,Calif (256.4 km S of epicenter) [Map] / Very weak shaking (MMI II) / 2-5 s : Light shaking. Swimming pool water moves about 5”.  
Tulare,Calif (256.4 km S of epicenter) [Map] / Very weak shaking (MMI II) / 2-5 s : Light shaking. Swimming pool water moves about 5”.  
CARSON CITY (39.5 km NNW of epicenter) [Map] / Weak shaking (MMI III) / vibration and rolling / 20-30 s
Fairfield,ca (227.4 km W of epicenter) [Map] / Weak shaking (MMI III) / simple rolling (tilting sideways along one direction) / 2-5 s : Slight  
Stockton, San Joaquin, California (168.7 km WSW of epicenter) [Map] / Moderate shaking (MMI V) / horizontal (sideways) swinging / 5-10 s
Sonora, CA (84.8 km SW of epicenter) [Map] / Moderate shaking (MMI V) / rattling, vibrating / 15-20 s (reported through our app)
Swauger Creek Rd / Light shaking (MMI IV) / single vertical bump / very short
95949 / Weak shaking (MMI III) / rattling, vibrating
Reno / Weak shaking (MMI III) / horizontal (sideways) swinging / 5-10 s : mild rocking  
Tulare ca / Weak shaking (MMI III) / simple rolling (tilting sideways along one direction) / 15-20 s : Easy rolling not jerky lasted approx maybe 15-20 sec  
Swauger Creek Rd / Light shaking (MMI IV) / single vertical bump / very short
Fresno, CA / Moderate shaking (MMI V) / horizontal (sideways) swinging / 2-5 s : Strong back and forth shaking with some rattling. No obvious signs of cracking or displaced objects.  
So late Tahoe / Moderate shaking (MMI V) / complex rolling (tilting in multiple directions) / 20-30 s
San Jose CA / Weak shaking (MMI III)
Santa Clara / Very weak shaking (MMI II) / horizontal (sideways) swinging / 5-10 s
Fresno CA / Light shaking (MMI IV) / single lateral shake / 5-10 s
Fresno / Weak shaking (MMI III) / rattling, vibrating / 5-10 s : I thought my dog had gotten on the couch and was scratching. A bump, bump, bump.  
Sacramento / Weak shaking (MMI III) / single lateral shake / 20-30 s
Jackson, CA / Light shaking (MMI IV) / rattling, vibrating / 10-15 s
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