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Earthquake Hazards Program

Magnitude 4.9 TONGA REGION

Saturday, March 21, 2009 at 01:27:57 UTC

Preliminary Earthquake Report

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Magnitude 4.9
Date-Time
  • Saturday, March 21, 2009 at 01:27:57 (UTC) - Coordinated Universal Time
  • Saturday, March 21, 2009 at 01:27:57 PM local time at epicenter

  • Time of Earthquake in other Time Zones
    Location 23.66S 175.30W
    Depth 35.0 kilometers
    Region TONGA REGION
    Distances 280 km (175 miles) S of NUKU'ALOFA, Tonga
    485 km (300 miles) SE of Ndoi Island, Fiji
    570 km (355 miles) SSW of Neiafu, Tonga
    1740 km (1080 miles) NE of Auckland, New Zealand
    Location Uncertainty Error estimate: horizontal +/- 13.2 km; depth fixed by location program
    Parameters Nst=54, Nph=54, Dmin=952.3 km, Rmss=0.80 sec, Erho=13.2 km, Erzz=0 km, Gp=79.2 degrees
    Source USGS NEIC (WDCS-D)
    Event ID uselac

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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. More->

    Preliminary Earthquake Report
    U.S. Geological Survey, National Earthquake Information Center
    World Data Center for Seismology, Denver


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