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Mag. 4.2 earthquake - Tasman Sea, 60 km southwest of Wellington, Wellington, New Zealand, on Monday, Oct 30, 2023, at 03:44 pm (Auckland time) -

A moderate magnitude 4.2 earthquake occurred under the sea near the coast of  New Zealand in the early afternoon of Monday, Oct 30, 2023 at 3.44 pm local time (Pacific/Auckland GMT +13). The quake had a very shallow depth of 8.6 km (5.3 mi) and was not felt (or at least not reported so).

Mag. 4.2 earthquake - Tasman Sea, 60 km southwest of Wellington, Wellington, New Zealand, on Monday, Oct 30, 2023, at 03:44 pm (Auckland time) Mag. 4.2 earthquake - Tasman Sea, 60 km southwest of Wellington, Wellington, New Zealand, on Monday, Oct 30, 2023, at 03:44 pm (Auckland time)

Moderate magnitude 4.2 earthquake at 9 km depth

30 Oct 02:46 UTC: First to report: GEONET (NZ) after 2 minutes.
30 Oct 02:47: Hypocenter depth recalculated from 25.2 to 12.3 km (from 15.7 to 7.6 mi). Epicenter location corrected by 9.3 km (5.8 mi) towards NNW.
30 Oct 02:50: Magnitude recalculated from 4.1 to 4.3. Hypocenter depth recalculated from 12.3 to 12.5 km (from 7.6 to 7.8 mi). Epicenter location corrected by 0.8 km (0.5 mi) towards S.
30 Oct 03:07: Magnitude recalculated from 4.3 to 4.2. Hypocenter depth recalculated from 12.5 to 8.6 km (from 7.8 to 5.3 mi). Epicenter location corrected by 2.6 km (1.6 mi) towards E.

Earthquake details

Date & timeOct 30, 2023 02:44:17 UTC -
Local time at epicenterMonday, Oct 30, 2023, at 03:44 pm (Pacific/Auckland GMT +13)
StatusPreliminary (automatic detection)
Magnitude4.2
Depth8.6 km
Epicenter latitude / longitude41.6768°S / 174.2739°E New Zealand
Seismic antipode41.6768°N / 5.726°W Spain
Shaking intensityLight shaking near epicenter
Felt0 reports
Primary data sourceGEONET (NZ) (Earthquake Commission and Geological Survey, New Zealand)
Weather at epicenter at time of quakeOvercast Clouds 18.1°C (65 F), humidity: 77%, wind: 6 m/s (12 kts) from E
Estimated seismic energy released1.3 x 1011 joules (35 megawatt hours, equivalent to 30.1 tons of TNT) | about seismic energy
Interactive map
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Nearby places

The closest larger town where the quake might have been felt is Wellington, the capital of  New Zealand with 380,000 inhabitants, in 60 km (37 mi) distance northeast of the epicenter. People likely experienced weak shaking there. Several smaller towns and villages are located closer to the epicenter and might have experienced stronger shaking.
The following table shows some of the places that might have been affected (or not) by the shaking.
Distance Place Max. shaking intensity(*) Region Country
16 km (10 mi)
W of epicenter
Seddon
(pop: 511)
IV: Light
Marlborough District, Marlborough
38 km (24 mi)
NW of epicenter
Tuamarina
(pop: 237)
III: Weak
Marlborough District, Marlborough
42 km (26 mi)
NW of epicenter
Renwick
(pop: 2,620)
III: Weak
Marlborough District, Marlborough
48 km (30 mi)
NW of epicenter
Picton
(pop: 4,800)
III: Weak
Marlborough District, Marlborough
59 km (36 mi)
NE of epicenter
Karori
(pop: 15,400)
III: Weak
Wellington City, Wellington
60 km (37 mi)
NE of epicenter
Wellington
(pop: 381,900)
III: Weak
Wellington
61 km (38 mi)
NW of epicenter
Havelock
(pop: 504)
III: Weak
Marlborough District, Marlborough
63 km (39 mi)
W of epicenter
Wairau Valley
(pop: 2,150)
III: Weak
Marlborough District, Marlborough
72 km (45 mi)
NE of epicenter
Wainuiomata
(pop: 19,400)
III: Weak
Lower Hutt City, Wellington
74 km (46 mi)
NE of epicenter
Lower Hutt
(pop: 101,200)
III: Weak
Wellington
77 km (48 mi)
NE of epicenter
Porirua
(pop: 50,900)
II: Very weak
Wellington
88 km (55 mi)
NE of epicenter
Upper Hutt
(pop: 38,400)
II: Very weak
Wellington
89 km (55 mi)
NE of epicenter
Pukerua Bay
(pop: 2,120)
II: Very weak
Porirua City, Wellington
94 km (58 mi)
NW of epicenter
Nelson
(pop: 54,700)
II: Very weak
Nelson
95 km (59 mi)
NW of epicenter
Stoke
(pop: 19,800)
II: Very weak
Nelson City, Nelson
96 km (59 mi)
SW of epicenter
Kaikoura
(pop: 685)
II: Very weak
Canterbury
99 km (61 mi)
W of epicenter
Richmond
(pop: 14,000)
II: Very weak
Tasman District, Tasman
105 km (65 mi)
NE of epicenter
Paraparaumu
(pop: 30,600)
II: Very weak
Kapiti Coast District, Wellington
106 km (66 mi)
W of epicenter
Wakefield
(pop: 2,610)
II: Very weak
Tasman District, Tasman
107 km (67 mi)
E of epicenter
Waipawa
(pop: 1,900)
II: Very weak
South Wairarapa District, Wellington
109 km (68 mi)
NW of epicenter
Mapua
(pop: 1,820)
II: Very weak
Tasman District, Tasman
110 km (69 mi)
NE of epicenter
Waikanae
(pop: 13,900)
II: Very weak
Kapiti Coast District, Wellington
121 km (75 mi)
NW of epicenter
Motueka
(pop: 7,490)
II: Very weak
Tasman District, Tasman
125 km (78 mi)
W of epicenter
Tapawera
(pop: 330)
II: Very weak
Tasman District, Tasman
126 km (78 mi)
NE of epicenter
Otaki
(pop: 6,090)
II: Very weak
Kapiti Coast District, Wellington
128 km (79 mi)
NE of epicenter
Carterton
(pop: 10,300)
II: Very weak
Wellington
130 km (81 mi)
NW of epicenter
Marahau
(pop: 231)
II: Very weak
Nelson
132 km (82 mi)
NE of epicenter
Gladstone
(pop: 940)
II: Very weak
Carterton District, Wellington
140 km (87 mi)
NE of epicenter
Masterton
(pop: 28,200)
II: Very weak
Wellington
143 km (89 mi)
NE of epicenter
Levin
(pop: 19,800)
II: Very weak
Horowhenua District, Manawatu-Wanganui
150 km (93 mi)
NE of epicenter
Kopuaranga
(pop: 1,020)
II: Very weak
Masterton, Wellington
151 km (94 mi)
SW of epicenter
Cheviot
(pop: 425)
II: Very weak
Hurunui District, Canterbury
152 km (95 mi)
SW of epicenter
Hanmer Springs
(pop: 1,120)
II: Very weak
Hurunui District, Canterbury
154 km (96 mi)
NW of epicenter
Takaka
(pop: 1,400)
II: Very weak
Tasman District, Tasman
159 km (99 mi)
NE of epicenter
Foxton
(pop: 4,780)
II: Very weak
Horowhenua District, Manawatu-Wanganui
169 km (105 mi)
NE of epicenter
Tokomaru
(pop: 563)
II: Very weak
Horowhenua District, Manawatu-Wanganui
182 km (113 mi)
NE of epicenter
Rongotea
(pop: 642)
II: Very weak
Manawatu District, Manawatu-Wanganui
185 km (115 mi)
NE of epicenter
Palmerston North
(pop: 76,000)
II: Very weak
Manawatu-Wanganui
189 km (118 mi)
NE of epicenter
Pahiatua
(pop: 2,810)
II: Very weak
Manawatu-Wanganui
198 km (123 mi)
NE of epicenter
Ashhurst
(pop: 3,230)
II: Very weak
Palmerston North City, Manawatu-Wanganui
Notes:
(*) Shaking intensity according to the Modified Mercalli Intensity Scale (MMI) and estimated using seismic models.

User-reports for this quake

There are no user reports for this quake yet.

If you felt it, be the first to report it!
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.

Compare Quake Data

Data for the same earthquake as reported by different agencies

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 Depth Time GMT
2023-10-30
Epicenter Agency
4.2 8.6 km
5.3 mi
02:44:17 New Zealand GEONET (NZ) (Earthquake Commission and Geological Survey, New Zealand)
3.8 25 km
15 mi
02:44:16 Cook Strait, New Zealand
23 km (14 mi) epicenter difference with GEONET (NZ)
RaspberryShake (RaspberryShake)
3.8 25 km
15 mi
02:44:16 53 Km SE of Witherlea, New Zealand
23 km (14 mi) epicenter difference with GEONET (NZ)
USGS (United States Geological Survey)
3.8 12 km
7.6 mi
02:44:16 Cook Strait, New Zealand
2.7 km (1.7 mi) epicenter difference with GEONET (NZ)
EMSC (European-Mediterranean Seismological Centre)

Seismograms

Seismic station: South Karori, New Zealand (SNZO/IU network) | Distance from quake: 54 km / 34 mi | Show on map | Station Info
Seismic station South Karori, New Zealand: 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. Bandpass filter applied: 0.2-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool
Show more

Aftershocks for this quake

No aftershocks have been recorded so far. When aftershocks are detected, we will update this section.

What are aftershocks?


Larger earthquakes (above magnitude 5 or so) such as this one are usually followed by smaller ones known as aftershocks that occur in the same area during the days, weeks, months or even years after the main shock.
[More info]

What about this quake?


Based on its magnitude, the fault that was active during the quake likely ruptured beneath a surface of approx. 2 km2 (=1 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 2 km (1 mi).
[More info]


Recorded aftershocks, latest first (0 quake)

Date and Time GMTMag
Depth
DistanceRegionDetails
Oct 30, 2023 03:44 pm (Auckland)
18 weeks ago
4.2

8.6 km
0 km - This quakeTasman Sea, 60 km SW of Wellington, Wellington, New Zealand
Main Shock (this quake)
More

Map of aftershocks

Earthquake statistics

Average number of earthquakes

Based on data from the past 10 years and our earthquake archive back to 1900, there are about 32,000 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi):
  • Mag. 6 or higher: 0.1 quakes per year (or 1 quake every 10 years)
  • Mag. 5 or higher: 4.2 quakes per year
  • Mag. 4 or higher: 51 quakes per year
  • Mag. 3 or higher: 346 quakes per year (or 28.8 quakes per month)
  • Mag. 2 or higher: 2,000 quakes per year (or 5.5 quakes per day)
  • Mag. 1 or higher: 3,200 quakes per year (or 8.7 quakes per day)
The area where this quake occurred has a very high level of seismic activity. It has had at least 13 quakes above magnitude 6 since 1900, which suggests that larger earthquakes of this size occur infrequently, probably on average approximately every 5 to 10 years.

Number of quakes per year

Previous quakes in the same area of this earthquake

Map of earlier quakes in the area of this quake

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Map to embed or share

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