Earthquake Measuring Up to M 7.1 Strikes Near NUKU’ALOFA, Tonga
A powerful earthquake measuring up to 7.1 Mw struck about 135 km (85 miles) ENE of NUKU’ALOFA, Tonga at a depth of 10 km on November 24, 2009 at 12:47 UTC.
The quake was followed by at least two aftershocks, the stronger of which measured up to 5.8 Mw.
The Pacific Tsunami Warning Center/NOAA/NWS Evaluated the Tsunami Hazard as follows:
NO DESTRUCTIVE WIDESPREAD TSUNAMI THREAT EXISTS BASED ON HISTORICAL EARTHQUAKE AND TSUNAMI DATA.
HOWEVER – EARTHQUAKES OF THIS SIZE SOMETIMES GENERATE LOCAL TSUNAMIS THAT CAN BE DESTRUCTIVE ALONG COASTS LOCATED WITHIN A HUNDRED KM OF THE EARTHQUAKE EPICENTER. AUTHORITIES IN THE REGION OF THE EPICENTER SHOULD BE AWARE OF THIS POSSIBILITY AND TAKE APPROPRIATE ACTION.
FEWW Comment: Does the SW Pacific region including Tonga, Fiji, and Samoan Islands regions act as a ‘planetary seismic shock damper?’ How much longer will the service last?
10-degree Map Centered at 20°S,175°W
Earthquake location Map. Source: USGS/EHP. Enhanced by FEWW.
- Magnitude: 6.8 [Maximum quake magnitude estimated at 7.1 Mw by FEWW]
- Tuesday, November 24, 2009 at 12:47:14 UTC
- Wednesday, November 25, 2009 at 02:47:14 AM at epicenter
- Location: 20.641°S, 174.068°W
- Depth: 10 km (6.2 miles)
- Region: TONGA
- 135 km (85 miles) ENE of NUKU’ALOFA, Tonga
- 220 km (135 miles) S of Neiafu, Tonga
- 480 km (300 miles) E of Ndoi Island, Fiji
- 2100 km (1300 miles) NE of Auckland, New Zealand
- Location: Uncertainty horizontal +/- 5.6 km (3.5 miles); depth fixed by location program
- Source: USGS NEIC (WDCS-D)
- Event ID: us2009pja1