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Μέτριος σεισμός μεγέθους 3.9 - 44 km βόρεια από Ukiah, Mendocino County, Καλιφόρνια, Ηνωμένες Πολιτείες, Παρ, 23 Απρ 2021 11:18 GMT

Μέτριος σεισμός μεγέθους 3.9 - 44 km βόρεια από Ukiah, Mendocino County, Καλιφόρνια, Ηνωμένες Πολιτείες, Παρ, 23 Απρ 2021 11:18 GMT Μέτριος σεισμός μεγέθους 3.9 - 44 km βόρεια από Ukiah, Mendocino County, Καλιφόρνια, Ηνωμένες Πολιτείες, Παρ, 23 Απρ 2021 11:18 GMT

Μέτριος σεισμός μεγέθους 3.9 σε βάθος 7.4 χλμ

23 Apr 11:22 UTC: Πρώτα να αναφέρει: USGS after 4 λεπτά.
23 Apr 11:24: Magnitude recalculated from 3.7 to 4.0.
23 Apr 14:02: Magnitude recalculated from 4.0 to 3.9.
23 Apr 18:00: Hypocenter depth recalculated from 6.6 to 7.4 km (from 4.1 to 4.6 mi).
Update Fri, 23 Apr 2021, 11:27

Moderate magnitude 4.0 quake hits 28 miles northeast of Ukiah, California, United States early morning

4.0 quake 23 Apr 4:18 am (GMT -7)
4.0 quake 23 Apr 4:18 am (GMT -7)
The United States Geological Survey reported a magnitude 4.0 quake in the United States near Ukiah, Mendocino County, California, only 8 minutes ago. The earthquake hit early morning on Friday 23 April 2021 at 4:18 am local time at a very shallow depth of 4.1 miles. 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 4.0 as well.
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 Potter Valley (pop. 650) located 15 miles from the epicenter, Willits (pop. 4,900) 19 miles away, Brooktrails (pop. 3,200) 19 miles away, and Redwood Valley (pop. 1,700) 20 miles away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Covelo (pop. 1,300) located 22 miles from the epicenter, Ukiah (pop. 15,900) 28 miles away, Nice (pop. 2,700) 30 miles away, and Clearlake (pop. 15,200) 45 miles away.

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Λεπτομέρειες σεισμού

Ημερομηνία και ώρα23 Apr 2021 11:18:40 UTC
Τοπική ώρα στο επίκεντρο23 Apr 4:18 am (GMT -7)
StatusΕπιβεβαιωμένος
Μέγεθος3.9
Βάθος7.4 km
Επίκεντρο γεωγραφικό πλάτος / γεωγραφικό μήκος39.52567°N / 123.0365°W (Mendocino, Καλιφόρνια, Ηνωμένες Πολιτείες)
Antipode39.526°S / 56.964°E
Ένταση δονήσεωνΑσθενής
Αισθητός6 αναφορές
Κύρια πηγή δεδομένωνUSGS (United States Geological Survey)
Πλησιέστερα ηφαίστειοClear Lake (66 km / 41 mi)
Κοντινά μέρη24 km (15 mi) ΒΑ of Potter Valley (pop: 646) | Στον χάρτη | Σεισμοί κοντά
30 km (19 mi) ΒΑ of Little Lake (pop: 4,860) | Στον χάρτη | Σεισμοί κοντά
32 km (20 mi) ΒΑ of Redwood Valley (pop: 1,730) | Στον χάρτη | Σεισμοί κοντά
35 km (22 mi) ΝΑ of Covelo (pop: 1,260) | Στον χάρτη | Σεισμοί κοντά
42 km (26 mi) ΝΑ of Laytonville (pop: 1,230) | Στον χάρτη | Σεισμοί κοντά
44 km (28 mi) ΒΑ of Ukiah (pop: 15,900) | Στον χάρτη | Σεισμοί κοντά
50 km (31 mi) ΒΔ of North Lakeport (pop: 3,310) | Στον χάρτη | Σεισμοί κοντά
67 km (41 mi) Α of Fort Bragg (Mendocino County) (pop: 7,290) | Στον χάρτη | Σεισμοί κοντά
72 km (45 mi) ΒΔ of Clearlake (Lake County) (pop: 15,200) | Στον χάρτη | Σεισμοί κοντά
170 km (105 mi) ΒΔ of Σακραμέντο (pop: 490,700) | Στον χάρτη | Σεισμοί κοντά
Ο καιρός στο επίκεντρο την ώρα του σεισμούBroken Clouds 5.9°C (43 F), humidity: 81%, wind: 2 m/s (3 kts) from NE
Εκτιμώμενη εκλυόμενη σεισμική ενέργεια4.5 x 1010 joules (12.4 megawatt hours, ισοδυναμεί με 10.7 τόνους TNT) | about seismic energy
Διαδραστικός χάρτης
[μικρότερα] [μεγαλύτερα]

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.ΒάθοςΤοποθεσίαΠηγή
3.97.4 km15km NNW of Lake Pillsbury, CA, USAUSGS
3.45 kmNORTHERN CALIFORNIA, USAEMSC

Seismograms

Seismic station: Marconi Conference Center, Marshall, CA, USA (MCCM/BK network) | Distance from quake: 154 km / 96 mi | Show on map | Station Info
Seismic station Marconi Conference Center, Marshall, CA, USA: 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. Source: IRIS Buffer of Uniform Data (BUD) webtool
Δείτε περισσότερα

User reports for this quake (6)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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San Jose, California 95148 / Light shaking (MMI IV) / single lateral shake / 2-5 s : Woke me up from sleep, a bag of items on top of another bag of items fell over. Then the wall behind me seemed to be jolted once northeasterly, creaked, rumbled and stopped. From jolt to stop was 2 seconds tops.  
Orange, CA / Light shaking (MMI IV) / single lateral shake / 5-10 s
Nas Lemoore (455.8 km SE of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 5-10 s
San Jose / Very weak shaking (MMI II) / single vertical bump / 1-2 s
5726 Ridgewood Road Willits, CA (27.6 km SW of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s : Woke up to house shaking.  
93041 / Light shaking (MMI IV) / rattling, vibrating / 2-5 s

Earlier earthquakes in the same area

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