Tonga earthquakes

M4.5 earthquake 63 km N of Hihifo, Tonga

A magnitude 4.5 earthquake struck 63 km N of Hihifo, Tonga on Mon, Apr 23, 2018, 2:32 AM GMT+13 (13:32 UTC), 55 km (34 mi) below the surface.

A larger quake followed: M5.6 91 km NW of Hihifo, Tonga. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
4.5 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2018-04-22 13:32:40 UTC
Depth
55.0 km (34.2 mi), shallow
Epicenter
15.390° S, 173.717° W
Region
Tonga
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 10.2 km horizontally, 5.4 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
109°
Stations used
23

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 5.691 km NW of Hihifo, Tonga · 3085 days ago · 10 km deep · 83 km away
  2. 4.680 km NE of Hihifo, Tonga · 3074 days ago · 10 km deep · 52 km away
  3. 4.567 km NE of Hihifo, Tonga · 3057 days ago · 35 km deep · 32 km away
  4. 4.599 km NNE of Hihifo, Tonga · 3045 days ago · 33 km deep · 43 km away
  5. 5.4133 km NNE of Hihifo, Tonga · 3044 days ago · 10 km deep · 80 km away
  6. 4.586 km NNE of Hihifo, Tonga · 3043 days ago · 10 km deep · 33 km away
  7. 5.0Samoa Islands region · 3038 days ago · 10 km deep · 76 km away
  8. 4.5129 km NNE of Hihifo, Tonga · 3035 days ago · 25 km deep · 72 km away
  9. 4.4119 km N of Hihifo, Tonga · 3032 days ago · 31 km deep · 57 km away
  10. 5.3117 km ENE of Hihifo, Tonga · 3031 days ago · 55 km deep · 94 km away · felt by 9
  11. 5.139 km WSW of Hihifo, Tonga · 3026 days ago · 120 km deep · 93 km away

Before

  1. 4.5103 km NNE of Hihifo, Tonga · 3091 days ago · 35 km deep · 53 km away
  2. 4.899 km ENE of Hihifo, Tonga · 3092 days ago · 71 km deep · 75 km away
  3. 5.192 km NNE of Hihifo, Tonga · 3108 days ago · 10 km deep · 37 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000dsqr. Read Fri, Oct 2, 2026, 11:07 PM UTC.