M 6.4 in Tonga on 01 Oct 2020 01:13 UTC

Hazard models

EQ parameters
Shakemap
Tsunami

Event summary

This earthquake is expected to have a low humanitarian impact based on the magnitude and the affected population and their vulnerability.

Earthquake Magnitude: 6.4M
Depth: 35 Km
Lat/Lon: -19.4762 , -174.2204
Event Date: 01 Oct 2020 01:13 UTC
01 Oct 2020 14:13 Local
Exposed Population: About 1000 people in MMI
About 19000 people within 100km
Source: NEIC us6000c3kz
Inserted at: 01 Oct 2020 02:15 UTC
INFORM Coping capacity of the alert score: 4.6 (Tonga)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 Tsunami GDACS score
NEIC 0 0 0
us6000c3kz Scaled population (raster) 0 Max wave alert 0m  
  C1 shakemap -0.59 Max wave realtime 0m  
  C2 shakemap 0.53      
  Country Vulnerability 0      
  INFORM_normalised 0.94      
Maximum expected impact using different data sources.

ShakeMap is a product of the USGS Earthquake Hazards Program in conjunction with the regional seismic networks. ShakeMaps provide near-real-time maps of ground motion and shaking intensity following significant earthquakes.


Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1335549 0 01 Oct 2020 01:13 6.7M, 10km N/A 20 thousand (in 100km) 0m (at 00:00) 00:08 PTWC
1335550 0 01 Oct 2020 01:13 6.7M, 10km N/A 20 thousand (in 100km) 0m (at 00:00) 00:09 NTWC
1335555 0 01 Oct 2020 01:13 6.4M, 35km 5.85 N/A (in MMI>=VII) 0m (at 00:00) 01:01 NEIC
1335735 0 01 Oct 2020 01:13 6.4M, 28km 5.85 N/A (in MMI>=VII) 0m (at 00:00) 1d 00:04 NEIC
The episode that generated the alert; the next major evaluations beyond 12 hours will not trigger additional alerts.
The episode that has the last updated information.
* The max MMI detected for sources having shakemaps;
** The population detected in MMI>=7 for episode with shakemap or in a 100km radius;
*** The tsunami max height.

Exposed population

The earthquake happened in Tonga ,of Tonga (population 47,160) . The alertlevel for this event is GREEN

Intensity Population
<1000 people
4500 people


Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1335555 -19.476/-174.22 6.4 35.0 5.679 01 Oct 2020 01:41 00:28 (new episode)
2 0 1335555 -19.495/-174.225 6.4 35.0 5.748 01 Oct 2020 02:15 01:01 (upd of #1)
3 0 1335555 -19.495/-174.225 6.4 35.0 5.881 01 Oct 2020 03:17 02:03 (upd of #2)
4 0 1335555 -19.495/-174.225 6.4 35.0 5.846 02 Oct 2020 01:18 1d 00:04 (upd of #3)
5 0 1335735 -19.536/-174.083 6.4 28.0 5.77 02 Oct 2020 02:22 1d 01:09 (new episode)

Affected Provinces

Intensity Region Province Country Population
Tonga Tonga 47000 people

Affected populated places. Areas of interest

Intensity Name Region Province Country City class Population Distance
Pangai Tonga Village 1700 people 40 km
Neiafu Tonga Village 4300 people 95 km
Kolonga Tonga Village - 205 km
Mua Tonga Village - 211 km
Nuku'alofa Tonga Capital 24000 people 211 km
Fatumu Tonga Village - 213 km
Nukunuku Tonga Village - 215 km
Pea Tonga Village - 215 km
Foui Tonga Village - 216 km
Houma Tonga Village - 219 km

see full list


Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.

Airports

Intensity Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft) Distance
Haapai HPA 12 Civ. Unpaved Yes 3900 36 km
Vavau International VAV 72 Civ. Unpaved Yes 5500 102 km

Ports

Intensity Name LOCODE Country Distance
Pangai TOPAN Tonga 38 km
Neiafu TONEI Tonga 95 km
Nuku'alofa TOTBU Tonga 210 km

More information

For a full list of available products related to this event, please refer to the GDACS Resources page.