M4.2 earthquake 139 km WNW of Pangai, Tonga
A magnitude 4.2 earthquake struck 139 km WNW of Pangai, Tonga on Sat, Apr 21, 2018, 3:09 AM GMT+13 (14:09 UTC), 263 km (163 mi) below the surface.
A larger quake followed: M4.9 113 km WSW of Pangai, Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.2 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2018-04-20 14:09:26 UTC
- Depth
- 263.0 km (163.4 mi), intermediate-depth
- Epicenter
- 19.218° S, 175.528° 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 13.6 km horizontally, 13.1 km in depth
- Magnitude uncertainty
- ±0.10
- Depth from
- From location
- Station coverage gap
- 112°
- Stations used
- 30
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.6131 km W of Neiafu, Tonga · 3053 days ago · 212 km deep · 74 km away
- 4.9113 km WSW of Pangai, Tonga · 3044 days ago · 92 km deep · 98 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us1000dpam. Read Thu, Oct 1, 2026, 6:49 PM UTC.