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Moderate mag. 4.3 earthquake - Sisak-Moslavina, 43 km southeast of Zagreb, Croatia, on Wednesday, Feb 24, 2021 at 10:58 am (GMT +1)

Moderate mag. 4.3 earthquake - Sisak-Moslavina, 43 km southeast of Zagreb, Croatia, on Wednesday, Feb 24, 2021 at 10:58 am (GMT +1) Moderate mag. 4.3 earthquake - Sisak-Moslavina, 43 km southeast of Zagreb, Croatia, on Wednesday, Feb 24, 2021 at 10:58 am (GMT +1)

Moderate magnitude 4.3 earthquake at 10 km depth

24 Feb 10:00 UTC: First to report: GFZ after 2 minutes.
24 Feb 10:05: Magnitude recalculated from 4.5 to 4.2. Epicenter location corrected by 4.7 km (2.9 mi) towards NNW.
24 Feb 10:11: Now using data updates from EMSC
Update Wed, 24 Feb 2021, 10:06

Moderate tremor of magnitude 4.2 just reported 34 km southeast of Zagreb, Croatia

4.2 quake 24 Feb 10:58 am (GMT +1)
4.2 quake 24 Feb 10:58 am (GMT +1)
A magnitude 4.2 earthquake near Zagreb, HR.21.3186885, Croatia, was reported only 8 minutes ago by the German Research Centre for Geosciences (GFZ), considered one of the key international agencies that monitor seismic activity worldwide. The earthquake occurred at a shallow depth of 10 km beneath the epicenter in the morning on Wednesday 24 February 2021 at 10:58 am local time. 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.
Based on the preliminary seismic data, the quake was probably felt by many people in the area of the epicenter. It should not have caused significant damage, other than objects falling from shelves, broken windows, etc.
In Lekenik (pop. 1,900) located 3 km from the epicenter, the quake should have been felt as light shaking.
Weak shaking might have been felt in Petrinja (pop. 13,900) located 15 km from the epicenter, Sisak (pop. 35,700) 17 km away, Velika Gorica (pop. 35,100) 20 km away, Sesvete (pop. 52,400) 31 km away, Donji grad (pop. 37,000) 33 km away, Zagreb (pop. 699,000) 34 km away, and Stenjevec (pop. 41,300) 38 km away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Zapresic (pop. 19,700) located 45 km from the epicenter, and Samobor (pop. 15,200) 47 km away.

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Earthquake details

Date & timeFeb 24, 2021 09:58:29 UTC
Local time at epicenterWednesday, Feb 24, 2021 at 10:58 am (GMT +1)
StatusConfirmed
Magnitude4.3
Depth10.0 km
Epicenter latitude / longitude45.46°N / 16.2°E (Town of Petrinja, Sisak-Moslavina, Croatia)
Antipode45.46°S / 163.8°W
Shaking intensityLight shaking
Felt206 reports
Primary data sourceEMSC (European-Mediterranean Seismological Centre)
Nearby towns and cities2 km (1 mi) S of Nebojan (Sisačko-Moslavačka) (pop: 191) | Show on map | Quakes nearby
7 km (5 mi) WNW of Petrinja (pop: 15,700) | Show on map | Quakes nearby
14 km (9 mi) W of Sisak (pop: 35,700) | Show on map | Quakes nearby
30 km (18 mi) SSE of Velika Gorica (Zagreb) (pop: 31,600) | Show on map | Quakes nearby
42 km (26 mi) S of Sesvete (City of Zagreb) (pop: 52,400) | Show on map | Quakes nearby
43 km (27 mi) SSE of Zagreb (City of Zagreb) (pop: 699,000) | Show on map | Quakes nearby
46 km (29 mi) SSE of Stenjevec (City of Zagreb) (pop: 41,300) | Show on map | Quakes nearby
53 km (33 mi) SE of Samobor (Zagrebačka) (pop: 16,000) | Show on map | Quakes nearby
54 km (33 mi) SE of Zapresic (Općina Zaprešić, Zagrebačka) (pop: 19,700) | Show on map | Quakes nearby
Weather at epicenter at time of quakeClear Sky 13.1°C (56 F), humidity: 58%, wind: 1 m/s (1 kts) from NE
Estimated seismic energy released1.8 x 1011 joules (49.4 megawatt hours, equivalent to 42.5 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
4.310 kmNW Balkan Region, CroatiaEMSC
4.210 kmCroatiaKRZO
4.210 kmCROATIAGFZ
4.46.5 kmCroatia [Land]INGV
3.910 kmSisak / Kroatien, CroatiaZAMG
3.910 km3 Km W of Petrinja, CroatiaUSGS

Seismograms

Seismic station: Grafenberg, Germany (GRFO/IU network) | Distance from quake: 600 km / 373 mi | Show on map | Station Info
Seismic station Grafenberg, Germany: 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
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User reports for this quake (215)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Zagreb, Dubrava (42.7 km NNW of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s : First single bump like someone hit bottom of my chair then start stretching and twisting for a few seconds. This was unusual one | 8 users found this interesting.  
  • Dosad najcudniji, zgrada se ljuljala u krug, Sisak
Zagreb, Blato (42.4 km NW of epicenter) [Map] / Light shaking (MMI IV) / 2-5 s : Glass was rattling, Cats were afraid | 7 users found this interesting. (reported through our app)  
Zagreb, Gornja Dubrava (44.1 km NNW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating : Noise and wawes | 4 users found this interesting. (reported through our app)  
Zagreb downtown / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : My cooker made metal noise, I was cooking and felt the vibrations stronger and stronger for like 5 seconds and then stopped all of a sudden. Wood ceiling and beams creaked once at the end. 2nd floor old building. | 2 users found this interesting.  
Dubrava, City of Zagreb (47.1 km NNW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : Low sound, like far-away thunder, rather long shaking, glassware rattle | 2 users found this interesting. (reported through our app)  
Novi Zagreb, Utrina (38.8 km NNW of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s : I was sitting in a chair and suddenly I felt my desk and chair both start to shake lightly for a few seconds.  
Zagreb, HR.21.3186885 (47.8 km NNW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : Felt in house in Gracani | One user found this interesting.  
Zagreb (41.6 km NNW of epicenter) [Map] / Moderate shaking (MMI V) : Ceiling short strong shake | One user found this interesting. (reported through our app)  
Zaprešić / not felt : Nothing in Zaprešić | One user found this interesting.  
Dugo selo / Light shaking (MMI IV) : Hose shaking - swaying for about 3-4 seconds | One user found this interesting.  
Brckovljani, Zagrebačka (38.1 km N of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 2-5 s
Novi Zagreb (41.9 km NNW of epicenter) [Map] / Light shaking (MMI IV)
Dubrava, City of Zagreb (44.7 km NNW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 5-10 s
Sisak, Sisačko-Moslavačka (14.4 km E of epicenter) [Map] / Moderate shaking (MMI V) (reported through our app)
near Glina, Sisačko-Moslavačka (18.8 km W of epicenter) [Map] / Moderate shaking (MMI V)
Zagreb, HR.21.3186885 (47.3 km NNW of epicenter) [Map] / Light shaking (MMI IV) / vibration and rolling / 2-5 s
Spinea, Venice, Veneto (312.2 km W of epicenter) [Map] / not felt (reported through our app)
Novi Zagreb (40.6 km NNW of epicenter) [Map] / Weak shaking (MMI III) / rattling, vibrating / 5-10 s
Jankomir, City of Zagreb (42.4 km NW of epicenter) [Map] / Light shaking (MMI IV) / complex motion difficult to describe / 5-10 s (reported through our app)
Petrinja, Sisačko-Moslavačka (8.8 km ESE of epicenter) [Map] / Moderate shaking (MMI V) / both vertical and horizontal swinging / 5-10 s : This one make me feel Like house is on the waves. (reported through our app)  
Budaševo, City of Sisak, Sisačko-Moslavačka (19.6 km E of epicenter) [Map] / not felt (reported through our app)
Varoška Rijeka, Federation of B&H (45.5 km SSW of epicenter) [Map] / Very weak shaking (MMI II) / single vertical bump / 1-2 s (reported through our app)
Jajce, Federation of B&H (154.5 km SSE of epicenter) [Map] / not felt
Brckovljani, Zagrebačka (38.1 km N of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 2-5 s
Donja Lomnica, Grad Velika Gorica, Zagrebačka (33.1 km NNW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s
Stenjevec, City of Zagreb (46.9 km NW of epicenter) [Map] / Light shaking (MMI IV) (reported through our app)
Villach-Seebach-Wasenboden, Carinthia (221.7 km NW of epicenter) [Map] / not felt (reported through our app)
Sisak, Sisačko-Moslavačka (13.6 km ENE of epicenter) [Map] / Moderate shaking (MMI V) (reported through our app)
Ù (50.4 km SSW of epicenter) [Map] / Very weak shaking (MMI II) (reported through our app)
Zabok (66.8 km NNW of epicenter) [Map] / Weak shaking (MMI III) : Osijetilo se kao lagano ljuljanje  
Petrinja, Sisačko-Moslavačka (6.2 km ESE of epicenter) [Map] / Strong shaking (MMI VI) / complex motion difficult to describe / 20-30 s (reported through our app)
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Earlier earthquakes in the same area

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