A 4.3-magnitude earthquake at a depth of 33 km
Sep 9 22:01 UTC: First to report: USGS 4 minutes later. Sep 9 22:03: Volume has been recalculated from 4.0 to 4.4 … [show all] … Sep 9 22:18: volume recalculated from 4.4 to 4.3.10 Sep 06:24: Hypocenter depth recalculated from 23.8 to 31.9 km (14.8 to 19.8 miles). Epicenter position corrected by 8.2 km (5.1 mi) toward SW 10 Sep 06:36: Epicenter depth recalculated from 31.9 to 33.8 km (from 19.8 to 21 mi). The epicenter was corrected by 1 km (0.6 mi) toward SSE. September 10 06:50: The depth of the epicenter was recalculated from 33.8 to 32.4 km (21 to 20 miles). Epicenter position corrected 1.3 km (0.8 mi) east Sep 10 07:30: Epicenter depth recalculated from 32.4 to 32.8 km (20 to 20 miles). The epicenter was corrected by 0.6 km (0.3 mi) northeast.
Updated Thursday, September 9, 2021, 22:09
A moderate earthquake of 4.4 on the Richter scale occurred 34 miles southwest of Eureka, California, United States.
4.4 Earthquake September 9 2:57 pm (GMT -7)
Just 11 minutes ago, a 4.4 magnitude earthquake occurred near Eureka, Humboldt County, California, USA. The tremor was recorded in the early afternoon of Thursday, September 9, 2021, at 2:57 p.m. local time, at a shallow depth of 15 miles below the Earth’s surface. Our monitoring service identified a second report from the European-Mediterranean Seismological Center (EMSC) which stated the earthquake with a magnitude of 3.8, and based on preliminary seismic data, the earthquake should not have caused any significant damage, but it may have been felt by many. People as a slight vibration in the epicenter area. The weak shaking was probably felt in Scotia (No. 850) 16 miles from the epicenter, Rio del (3,400 inhabitants) 17 miles, Fortuna (population 12,000) 21 miles away, and Humboldt Hill (pop. population 3,400 people) 29 miles, includes other towns or cities close to the epicenter where the earthquake may have been felt as a very weak shaking Eureka (27,000 people) located 34 miles from the epicenter, Bayside (17100) 39 miles away, Arcata (population 17,800) is 40 miles away, and McKinleyville (15,200) is 45 miles away. VolcanoDiscovery will automatically update the magnitude and depth if these things change and follow up if other important news about the earthquake becomes available. If you are 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 live updates to anyone around the world who wants to know more about this earthquake.
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Date and time: September 9, 2021 21:57:56 UTC – local time at the epicenter: Thursday, September 9, 2021 2:57 pm (GMT-7) Size: 4.3 Depth: 32.8 km Latitude/Longitude at the epicenter : 40.2705°N/124.38133°W↗ (North Pacific Ocean, California, USA) Antipode: 40.271°S/55.619°E Nearest volcano: Clear Lake (201 km/125 mi) Nearest towns and cities: 33 km (21 mi) Southwest Scotia (Humboldt County) (population: 850) -> See nearby earthquakes! 41 km (26 mi) southwest of Fortuna (Humboldt County) (population: 12,000) -> See nearby earthquakes! 50 km (31 mi) WNW Redway (Spot: 1,230) -> See nearby earthquakes! 62 km (38 mi) southeast of Eureka (Humboldt County) (population: 27,000) -> See nearby earthquakes! 69 km (43 mi) SW Bayside (Humboldt County) (pop: 17100) -> See nearby earthquakes 71 km (44 mi) SW Arcata (Humboldt County) (population: 17,800) -> See nearby earthquakes! 79 km (49 mi) southwest of McKinleyville (Humboldt County) (population: 15,200) -> See nearby earthquakes! 172 km (107 mi) WSW of Redding (population: 91,600) -> See nearby earthquakes! 249 km (155 mi) northwest of Santa Rosa (population: 175,000) -> See nearby earthquakes! 311 km (193 mi) northwest of Sacramento (population: 490,700) -> See nearby earthquakes! Weather in the epicenter at the time of the earthquake: Clouds broken 18.1 °C (65 °F), Humidity: 64%, Wind: 6 m/s (13 knots) From raw data source N: USGS (USGS) Estimated released power: 1.8 x 1011 Joules (49.4 MW/h, equivalent to 42.5 tons of TNT) More information If you felt this earthquake (or if you were near the epicenter), please share your experience and submit a short “felt it” report! Other users would like to hear about it, if you don’t feel the earthquake even though you are in the area, please report it! Your contribution is valuable to seismic science, seismic risk analysis, and mitigation efforts. You can use your device’s location or a map to indicate where you are during the earthquake. Thank you! Data on the same earthquake was reported by different agencies
Information: The more agencies report the same earthquake and publish similar data, the more you can trust the data. It usually takes up to a few hours for earthquake parameters to be calculated with near-perfect accuracy.
Mag.DepthLocationSource 4.333 km4km W of Petrolia, CAUSGS 4.310 kmNORTHERN CALIFORNIAEMSC Previous earthquakes in the same area Please wait while searching through millions of records, this can take up to 20-30 seconds.
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