Light mag. 3.1 earthquake - 7.2 km east of Christchurch, Canterbury, New Zealand, on Wednesday, April 21, 2021 at 03:21 (GMT) -

Light mag. 3.1 earthquake - 7.2 km east of Christchurch, Canterbury, New Zealand, on Wednesday, April 21, 2021 at 03:21 (GMT)

Light magnitude 3.1 earthquake at 5 km depth

21 Apr 03:23 UTC: First to report: GEONET (NZ) after 1 minute.
21 Apr 03:27: Magnitude recalculated from 3.2 to 3.1. Hypocenter depth recalculated from 3.7 to 4.5 km (from 2.3 to 2.8 mi). Epicenter location corrected by 1.9 km (1.2 mi) towards ENE.
Date & time: Apr 21, 2021 03:21:42 UTC -
Magnitude: 3.1
Depth: 4.5 km
Epicenter latitude / longitude: 43.51637°S / 172.72008°E (Christchurch City, Canterbury, New Zealand)
Antipode: 43.516°N / 7.28°W
Nearby towns and cities:
7 km (5 mi) ENE of Christchurch (pop: 363,900) --> See nearby quakes!
17 km (10 mi) SSE of Kaiapoi (pop: 10,200) --> See nearby quakes!
18 km (11 mi) ENE of Prebbleton (Región de Canterbury) (pop: 3,600) --> See nearby quakes!
26 km (16 mi) SSE of Rangiora (pop: 18,400) --> See nearby quakes!
28 km (17 mi) ENE of Rolleston (pop: 3,120) --> See nearby quakes!
40 km (25 mi) S of Amberley (pop: 1,110) --> See nearby quakes!
44 km (27 mi) NE of Leeston (pop: 1,270) --> See nearby quakes!
50 km (31 mi) ESE of Oxford (Región de Canterbury) (pop: 1,780) --> See nearby quakes!
90 km (56 mi) ENE of Ashburton (pop: 30,100) --> See nearby quakes!
300 km (186 mi) SSW of Wellington (pop: 381,900) --> See nearby quakes!
Primary data source: GEONET (NZ) (Earthquake Commission and Geological Survey, New Zealand)
Estimated released energy: 2.8 x 109 joules (783 kilowatt hours, equivalent to 0.674 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.
3.14.5 kmNew ZealandGEONET (NZ)

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.
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Aranui Christchurch / Moderate shaking (MMI V) / horizontal (sideways) swinging / 2-5 s : I was walking and I heard a bang/rumble and I almost lost my balance. | 3 users found this interesting.  
Christchurch, Canterbury (14.2 km W of epicenter) [Map] / Very weak shaking (MMI II) / single vertical bump / very short : Made me look around. Very short. More noise that anything. Just to show that rock is still breaking under ground. We should always expect a big one here. (reported through our app)  
Christchurch / Weak shaking (MMI III) / single lateral shake / very short : sharp quick jolt  
SAINT MARTINS / Weak shaking (MMI III) / horizontal (sideways) swinging
Christchurch / Weak shaking (MMI III) / single vertical bump / very short : A sharp jolt  
New Brighton / Weak shaking (MMI III)
ARANUI, Christchurch, / Weak shaking (MMI III) / single vertical bump / 2-5 s : Just a huge bang sounded like a cannon. Not much shaking more an upward thrust  
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