M5.7 earthquake 83 km SE of Neiafu, Tonga
A magnitude 5.7 earthquake struck 83 km SE of Neiafu, Tonga on Fri, Jul 31, 2020, 8:16 AM GMT+13 (19:16 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
- 5.7 (Mww, W-phase moment), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2020-07-30 19:16:50 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 19.078° S, 173.336° W
- Region
- Tonga
- Felt reports
- 3
- Strongest shaking
- IV, light shaking
- PAGER alert
- Green
- 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 |
|---|---|---|---|
| 5.7 | Mww, W-phase moment | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.08 · 15 stations |
| 5.75 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- IV, light shaking
- Peak ground acceleration
- 1.5% of gravity
- Peak ground velocity
- 0.0 cm/s
- Map
- Automatic
Did you feel it?
3 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.
Estimated impact
The USGS PAGER system estimates deaths and economic losses from the shaking and the population and buildings exposed to it.
- Alert level
- Green: little or no damage or loss of life expected
| Range | Chance |
|---|---|
| Under 1 | 65% |
| 1 to 10 | 30% |
| 10 to 100 | 4% |
| 100 to 1,000 | Under 1% |
| 1,000 to 10,000 | Under 1% |
| 10,000 to 100,000 | Under 1% |
| 100,000 to 10,000,000 | Under 1% |
| Range, million USD | Chance |
|---|---|
| Under 1 | 65% |
| 1 to 10 | 30% |
| 10 to 100 | 4% |
| 100 to 1,000 | Under 1% |
| 1,000 to 10,000 | Under 1% |
| 10,000 to 100,000 | Under 1% |
| 100,000 to 10,000,000 | Under 1% |
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 7.9 km horizontally, 1.7 km in depth
- Magnitude uncertainty
- ±0.08
- Depth from
- Operator assigned
- Station coverage gap
- 32°
- Stations used
- 86
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.7 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 4.493 km ENE of Neiafu, Tonga · 2246 days ago · 10 km deep · 72 km away
- 4.482 km ESE of Neiafu, Tonga · 2237 days ago · 10 km deep · 6 km away
- 4.4101 km ESE of Neiafu, Tonga · 2233 days ago · 10 km deep · 21 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000b72l (also filed as iscgem618704411). Read Fri, Oct 2, 2026, 6:47 AM UTC.