Magnitude 4.6 TONGA
Friday, April 17, 2009 at 21:23:58 UTC
Preliminary Earthquake Report
Magnitude | 4.6 |
---|---|
Date-Time |
Time of Earthquake in other Time Zones |
Location | 17.56S 173.27W |
Depth | 10 kilometers |
Region | TONGA |
Distances |
140 km (90 miles) NNE of Neiafu, Tonga 185 km (115 miles) SSE of Hihifo, Tonga 445 km (275 miles) NNE of NUKU'ALOFA, Tonga 2445 km (1510 miles) NNE of Auckland, New Zealand |
Location Uncertainty | Error estimate: horizontal +/- 18.0 km; depth fixed by location program |
Parameters | Nst=22, Nph=22, Dmin=434.5 km, Rmss=1.64 sec, Erho=18.0 km, Erzz=0 km, Gp=77.9 degrees |
Source | USGS NEIC (WDCS-D) |
Event ID | usfnfz |
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NB:
The official magnitude for this earthquake is indicated at the top of this page.
This was the best available estimate of the earthquake's size,
at the time that this page was created. Other magnitudes associated
with web pages linked from here are those determined at various times
following the earthquake with different types of seismic data.
Although, given the data used, they are legitimate estimates of magnitude
they are not considered the official magnitude.
The region name is an automatically generated name
from the Flinn-Engdahl (F-E) seismic and geographical regionalization scheme.
The boundaries of
these regions are defined at one-degree intervals and therefore differ from
irregular political boundaries.
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Preliminary Earthquake Report
U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver