M5.7 earthquake 227 km WNW of Pangai, Tonga
A magnitude 5.7 earthquake struck 227 km WNW of Pangai, Tonga on Wed, Sep 4, 2019, 10:48 PM GMT+13 (09:48 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
- 2019-09-04 09:48:22 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 18.920° S, 176.301° W
- Region
- Tonga
- Strongest shaking
- I, not felt 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 · ±0.05 · 39 stations |
| 5.7 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
| 5.6 | Mwb, body-wave moment | USGS National Earthquake Information Center | Moment tensor · Reviewed |
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Map
- Automatic
Did you feel it?
No one has reported feeling this quake to the USGS.
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% |
Fault motion and ground failure
How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.
- Faulting
- Strike-slip
- Moment magnitude
- 5.7 Mww
- Nodal plane 1
- Strike 46°, dip 79°, rake -9°
- Nodal plane 2
- Strike 138°, dip 81°, rake -169°
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 5.9 km horizontally, 1.8 km in depth
- Magnitude uncertainty
- ±0.05
- Depth from
- Operator assigned
- Station coverage gap
- 71°
- Stations used
- 67
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.7 and up: 2 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.4170 km NW of Pangai, Tonga · 2572 days ago · 175 km deep · 63 km away
- 4.4258 km NW of Nuku‘alofa, Tonga · 2560 days ago · 326 km deep · 81 km away
Before
Earthquakes todayTonga earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us70005bwn (also filed as iscgem616334437). Read Fri, Oct 2, 2026, 6:01 AM UTC.