M5.4 earthquake 118 km ENE of ‘Ohonua, Tonga
A magnitude 5.4 earthquake struck 118 km ENE of ‘Ohonua, Tonga on Sun, Aug 26, 2018, 8:26 PM GMT+13 (07:26 UTC), 10 km (6 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.4 (Mww, W-phase moment), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2018-08-26 07:26:06 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 20.887° S, 173.909° 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 |
|---|---|---|---|
| 5.4 | Mww, W-phase moment | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.066 · 22 stations |
| 5.4 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
Did you feel it?
No one has reported feeling this quake to the USGS.
Fault motion and ground failure
How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.
- Faulting
- Reverse (thrust)
- Moment magnitude
- 5.4 Mww
- Nodal plane 1
- Strike 35°, dip 44°, rake 104°
- Nodal plane 2
- Strike 196°, dip 48°, rake 77°
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 6.3 km horizontally, 1.7 km in depth
- Magnitude uncertainty
- ±0.07
- Depth from
- Operator assigned
- Station coverage gap
- 32°
- Stations used
- 107
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.4 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.4111 km SSE of Pangai, Tonga · 2959 days ago · 10 km deep · 28 km away
- 4.5109 km SE of Pangai, Tonga · 2934 days ago · 10 km deep · 34 km away
- 5.1106 km E of ‘Ohonua, Tonga · 2932 days ago · 10 km deep · 50 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us1000ghii (also filed as iscgem615000995). Read Fri, Oct 2, 2026, 12:23 PM UTC.