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Moderate mag. 4.1 earthquake - Sisak-Moslavina, 42 km southeast of Zagreb, Croatia, on Thursday, Feb 18, 2021 at 1:08 pm (GMT +1)

Moderate mag. 4.1 earthquake - Sisak-Moslavina, 42 km southeast of Zagreb, Croatia, on Thursday, Feb 18, 2021 at 1:08 pm (GMT +1) Moderate mag. 4.1 earthquake - Sisak-Moslavina, 42 km southeast of Zagreb, Croatia, on Thursday, Feb 18, 2021 at 1:08 pm (GMT +1)

Moderate magnitude 4.1 earthquake at 10 km depth

18 Feb 12:11 UTC: First to report: GFZ after 3 minutes.
18 Feb 12:15: Epicenter location corrected by 3.3 km (2.1 mi) towards S.
18 Feb 12:16: Magnitude recalculated from 4.2 to 4.1.
Update Thu, 18 Feb 2021, 12:15

Moderate 4.2 quake hits near Zagreb, Croatia

4.2 quake 18 Feb 1:08 pm (GMT +1)
4.2 quake 18 Feb 1:08 pm (GMT +1)
An earthquake of magnitude 4.2 occurred around noon on Thursday 18 February 2021 at 1:08 pm local time near Zagreb, Croatia, as reported by the German Research Centre for Geosciences (GFZ).
According to preliminary data, the quake was located at a shallow depth of 10 km. 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.
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 Žažina (pop. 360) located 1 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 9 km from the epicenter, Sisak (pop. 35,700) 13 km away, Velika Gorica (pop. 35,100) 26 km away, Sesvete (pop. 52,400) 37 km away, Donji grad (pop. 37,000) 39 km away, and Zagreb (pop. 699,000) 39 km away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Stenjevec (pop. 41,300) located 43 km from the epicenter, Zapresic (pop. 19,700) 51 km away, and Samobor (pop. 15,200) 51 km away.

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Earthquake details

Date & timeFeb 18, 2021 12:08:42 UTC
Local time at epicenterThursday, Feb 18, 2021 at 1:08 pm (GMT +1)
StatusConfirmed
Magnitude4.1
Depth10.0 km
Epicenter latitude / longitude45.48°N / 16.23°E (Town of Petrinja, Sisak-Moslavina, Croatia)
Antipode45.48°S / 163.77°W
Shaking intensityLight shaking
Felt117 reports
Primary data sourceGFZ (German Research Centre for Geosciences)
Nearby towns and cities1 km (1 mi) WNW of Mala Gorica (Sisačko-Moslavačka) (pop: 510) | Show on map | Quakes nearby
7 km (4 mi) NW of Petrinja (pop: 15,700) | Show on map | Quakes nearby
12 km (7 mi) W of Sisak (pop: 35,700) | Show on map | Quakes nearby
29 km (18 mi) SSE of Velika Gorica (Zagreb) (pop: 31,600) | Show on map | Quakes nearby
40 km (25 mi) SSE of Sesvete (City of Zagreb) (pop: 52,400) | Show on map | Quakes nearby
42 km (26 mi) SSE of Zagreb (City of Zagreb) (pop: 699,000) | Show on map | Quakes nearby
45 km (28 mi) SE of Stenjevec (City of Zagreb) (pop: 41,300) | Show on map | Quakes nearby
53 km (33 mi) SE of Zapresic (Općina Zaprešić, Zagrebačka) (pop: 19,700) | Show on map | Quakes nearby
54 km (33 mi) SE of Samobor (Zagrebačka) (pop: 16,000) | Show on map | Quakes nearby
Weather at epicenter at time of quakeMist 3°C (37 F), humidity: 100%, wind: 0 m/s (0 kts) from SSE
Estimated seismic energy released8.9 x 1010 joules (24.8 megawatt hours, equivalent to 21.3 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
4.110 kmNW Balkan Region, CroatiaGFZ
4.12 kmCROATIAEMSC
4.213 kmCroatia [Land]INGV
3.710 kmCroatia RegionNIEP
3.710 kmSisak / Kroatien, CroatiaZAMG
4.110 kmCroatiaKRZO
4.05 kmOLDACT:UP, CroatiaUni Köln

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 (135)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Zagreb, Dubrava (41.3 km NNW of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s : First furniture start cracking then this old one swinging starts ...... not long but it's starts like one in December and thankfully was short | 3 users found this interesting.  
Zagreb, HR.21.3186885 (42.5 km NNW of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s : Rumbling, few seconds later significant shaking | 3 users found this interesting. (reported through our app)  
Zagreb, west side, Gajnuce / not felt / single lateral shake / 2-5 s : Zagreb, west, Gajnice, 1st floor of building, heared tremor of cabinet doors, but no any other sound or ground shaking. | One user found this interesting.  
Novi Zagreb (37.7 km NNW of epicenter) [Map] / Very weak shaking (MMI II) / horizontal (sideways) swinging / 1-2 s : I was sitting on a chair and i could feel like the ground moved beneath my chair. Very uncomfortable. Thank God it was over in a second. (reported through our app)  
Velika Mlaka / Weak shaking (MMI III) / 2-5 s : Boom sound and light shakeing | 2 users found this interesting.  
Odranski obrez, Zagreb (34.7 km NW of epicenter) [Map] / Strong shaking (MMI VI) / single lateral shake / 1-2 s : Short but strong | One user found this interesting.  
Zagreb downtown / not felt : i was standing up and moving a bit so I did not feel shaking, but i heard the wood of my flat (old building, 2nd floor) creaking very loudly  
Jankomir, City of Zagreb (43.4 km NW of epicenter) [Map] / Light shaking (MMI IV) / 2-5 s
Novi Zagreb (41.1 km NNW of epicenter) [Map] / Moderate shaking (MMI V)
zagreb (44.4 km NNW of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s
Štore (110.8 km NW of epicenter) [Map] / not felt (reported through our app)
Novi Zagreb (41.1 km NNW of epicenter) [Map] / Moderate shaking (MMI V)
Zagreb (42 km NW of epicenter) [Map] / Weak shaking (MMI III) / simple rolling (tilting sideways along one direction) / 5-10 s (reported through our app)
Trieste (190.4 km W of epicenter) [Map] / not felt (reported through our app)
Trieste, Friuli Venezia Giulia (191.1 km W of epicenter) [Map] / not felt (reported through our app)
Sveta Nedelja (48.6 km NW of epicenter) [Map] / not felt (reported through our app)
Zagreb, HR.21.3186885 (43.8 km NNW of epicenter) [Map] / not felt : I was out, but it was felt by others in the neighbourhood. (reported through our app)  
Andritz, Graz Stadt, Styria (191.9 km NNW of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s (reported through our app)
Petrinja, Sisačko-Moslavačka (6.2 km SE of epicenter) [Map] / Strong shaking (MMI VI) (reported through our app)
Graz (1.6 km NW of epicenter) [Map] / not felt
Zagreb, HR.21.3186885 (40.9 km NNW of epicenter) [Map] / Weak shaking (MMI III) (reported through our app)
Sisak, Sisačko-Moslavačka (11.4 km E of epicenter) [Map] / Light shaking (MMI IV) (reported through our app)
Novi Zagreb (37.7 km NNW of epicenter) [Map] / Moderate shaking (MMI V) (reported through our app)
Žažina (4.1 km NNE of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s (reported through our app)
Novi Zagreb (39.1 km NNW of epicenter) [Map] / Weak shaking (MMI III) (reported through our app)
Petrinja (5.4 km SSE of epicenter) [Map] / Strong shaking (MMI VI) (reported through our app)
Azzano Decimo, Province of Pordenone, Friuli Venezia Giulia (277 km W of epicenter) [Map] / not felt (reported through our app)
Karlovac (52.5 km W of epicenter) [Map] / Light shaking (MMI IV) (reported through our app)
Karlovac (52.5 km W of epicenter) [Map] / Moderate shaking (MMI V) (reported through our app)
Daruvar, Bjelovarsko-Bilogorska (82 km E of epicenter) [Map] / not felt
Sisak, Sisačko-Moslavačka (10.8 km E of epicenter) [Map] / Strong shaking (MMI VI) (reported through our app)
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