M4.9 earthquake Tonga
A magnitude 4.9 earthquake struck in Tonga on Sun, Sep 23, 2018, 7:51 PM GMT-12 (07:51 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
- 4.9 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2018-09-24 07:51:04 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 15.749° S, 175.280° 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 |
|---|---|---|---|
| 4.9 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.042 · 181 stations |
| 5.25 | 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 8.5 km horizontally, 1.4 km in depth
- Magnitude uncertainty
- ±0.04
- Depth from
- Operator assigned
- Station coverage gap
- 56°
- Stations used
- 174
Nearby
Within 100 km, magnitude 1.9 and up: 6 in the 60 days after this one and 4 in the 30 days before it.
After
- 4.4211 km W of Hihifo, Tonga · 2927 days ago · 340 km deep · 51 km away
- 4.3208 km W of Hihifo, Tonga · 2924 days ago · 339 km deep · 64 km away
- 4.3150 km WSW of Hihifo, Tonga · 2919 days ago · 332 km deep · 74 km away
- 4.480 km WSW of Hihifo, Tonga · 2907 days ago · 108 km deep · 89 km away
- 4.5115 km WNW of Hihifo, Tonga · 2897 days ago · 262 km deep · 54 km away
- 4.4142 km WNW of Hihifo, Tonga · 2891 days ago · 317 km deep · 35 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us2000hj9d (also filed as iscgem612741577). Read Sat, Oct 3, 2026, 12:57 AM UTC.