M5.1 earthquake 237 km S of ‘Ohonua, Tonga
A magnitude 5.1 earthquake struck 237 km S of ‘Ohonua, Tonga on Mon, Jul 30, 2018, 7:06 PM GMT+13 (06:06 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M5.5 south of Tonga. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.1 (mb, body-wave), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2018-07-30 06:06:37 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 23.472° S, 174.831° W
- Region
- Tonga
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 5.1 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.044 · 168 stations |
| 5.11 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
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 5.2 km horizontally, 1.7 km in depth
- Magnitude uncertainty
- ±0.04
- Depth from
- Operator assigned
- Station coverage gap
- 32°
- Stations used
- 199
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.1 and up: 5 in the 60 days after this one and 0 in the 30 days before it.
After
- 4.5194 km SSE of ‘Ohonua, Tonga · 2969 days ago · 10 km deep · 86 km away
- 5.5south of Tonga · 2949 days ago · 10 km deep · 70 km away
- 4.7south of Tonga · 2942 days ago · 10 km deep · 89 km away
- 4.6south of Tonga · 2940 days ago · 10 km deep · 97 km away
- 4.7south of Tonga · 2926 days ago · 10 km deep · 98 km away
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us2000gh16 (also filed as iscgem612373497). Read Fri, Oct 2, 2026, 11:32 AM UTC.