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Moderate mag. 4.2 earthquake - 37 mi southeast of South Lake Tahoe, El Dorado County, California, USA, on 8 Jul 4:58 pm (GMT -7)

Moderate mag. 4.2 earthquake - 37 mi southeast of South Lake Tahoe, El Dorado County, California, USA, on 8 Jul 4:58 pm (GMT -7) Moderate mag. 4.2 earthquake - 37 mi southeast of South Lake Tahoe, El Dorado County, California, USA, on 8 Jul 4:58 pm (GMT -7)

Moderate magnitude 4.2 earthquake at 6 km depth

9 Jul 00:00 UTC: First to report: USGS after 1 minute.
9 Jul 00:03: Magnitude recalculated from 4.0 to 4.5. Hypocenter depth recalculated from 8.0 to 3.3 km (from 5 to 2.1 mi). Epicenter location corrected by 4.4 km (2.7 mi) towards E.
9 Jul 01:26: Magnitude recalculated from 4.5 to 4.2.
9 Jul 07:52: Hypocenter depth recalculated from 3.3 to 5.8 km (from 2.1 to 3.6 mi).
Update Fri, 9 Jul 2021, 00:06

Moderate earthquake of magnitude 4.5 just reported 37 miles southeast of South Lake Tahoe, California, United States

4.5 quake 8 Jul 4:58 pm (GMT -7)
4.5 quake 8 Jul 4:58 pm (GMT -7)
A very shallow magnitude 4.5 earthquake was reported in the afternoon near South Lake Tahoe, El Dorado County, California, USA.
According to the United States Geological Survey, the quake hit on Thursday 8 July 2021 at 4:58 pm local time at a very shallow depth of 2.1 miles. Shallow earthquakes are felt more strongly than deeper ones as they are closer to the surface. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 4.2.
Based on the preliminary seismic data, the quake should have been widely felt by almost everyone in the area of the epicenter. It might have caused light to moderate damage.
Moderate shaking probably occurred in Coleville (pop. 500) located 2 miles from the epicenter.
Weak shaking might have been felt in Topaz Ranch Estates (pop. 1,500) located 14 miles from the epicenter, Smith Valley (pop. 1,600) 20 miles away, Gardnerville Ranchos (pop. 11,300) 27 miles away, Gardnerville (pop. 5,700) 31 miles away, Gardnerville (pop. 5,700) 31 miles away, Johnson Lane (pop. 6,500) 37 miles away, and South Lake Tahoe (pop. 21,700) 37 miles away.
VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you're in the area, please send us your experience through our reporting mechanism, either online or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.

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Earthquake details

Date & timeJul 8, 2021 23:58:53 UTC
Local time at epicenter8 Jul 4:58 pm (GMT -7)
Depth5.8 km
Epicenter latitude / longitude38.537°N / 119.524°W (Mono, California, United States)
Antipode38.537°S / 60.476°E
Shaking intensityWeak shaking
Felt5 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoMono Lake (76 km / 47 mi)
Nearby towns and cities4 km (2 mi) SSW of Coleville (pop: 495) | Show on map | Quakes nearby
22 km (14 mi) S of Topaz Ranch Estates (Nevada) (pop: 1,500) | Show on map | Quakes nearby
32 km (20 mi) SSW of Smith Valley (Nevada) (pop: 1,600) | Show on map | Quakes nearby
43 km (27 mi) SSE of Gardnerville Ranchos (Nevada) (pop: 11,300) | Show on map | Quakes nearby
59 km (37 mi) SSW of Yerington (Nevada) (pop: 3,060) | Show on map | Quakes nearby
59 km (37 mi) SSE of Johnson Lane (Douglas County, Nevada) (pop: 6,490) | Show on map | Quakes nearby
59 km (37 mi) SE of South Lake Tahoe (El Dorado County) (pop: 21,700) | Show on map | Quakes nearby
113 km (70 mi) S of Sparks (Nevada) (pop: 96,100) | Show on map | Quakes nearby
113 km (70 mi) SSE of Reno (Nevada) (pop: 241,400) | Show on map | Quakes nearby
171 km (107 mi) E of Sacramento (pop: 490,700) | Show on map | Quakes nearby
Weather at epicenter at time of quakeBroken Clouds 27.2°C (81 F), humidity: 20%, wind: 7 m/s (14 kts) from SW
Estimated seismic energy released1.3 x 1011 joules (35 megawatt hours, equivalent to 30.1 tons of TNT) | about seismic energy
Show interactive Map
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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.
4.25.8 km29km SE of Markleeville, CAUSGS


Seismic station: Mammoth (MLAC/CI network) | Distance from quake: 117 km / 73 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: 0.2-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
Show more

User reports for this quake (7)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Leave a comment if you find a particular report interesting or want to add to it.
Flag as inappropriate.
Mark as helpful or interesting.
Send your own user report!
Twain Harte (83.3 km SW of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 1-2 s : Yes. Series of them back to back | One user found this interesting. (reported through our app)  
  • I would rather see these smaller ones here inland and the larger trigger to the whats now settlingback in place then the onther way around
Davis, ca (194.9 km W of epicenter) [Map] / Very weak shaking (MMI II) / vibration and rolling / 1-2 s
LAS VEGAS (454.7 km SE of epicenter) [Map] / not felt (reported through our app)
Sun valley Nv (120.5 km N of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating : Light shaking (reported through our app)  
Elverta / Weak shaking (MMI III) / 2-5 s
Lemoore (255.5 km S of epicenter) [Map] / not felt (reported through our app)
MARIPOSA (117.6 km SSW of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Rumbling and tremors (reported through our app)  

Earlier earthquakes in the same area

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