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Earthquake Hazards Program

Magnitude 4.6 TONGA REGION

Sunday, March 22, 2009 at 11:48:29 UTC

Preliminary Earthquake Report

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Magnitude 4.6
Date-Time
  • Sunday, March 22, 2009 at 11:48:29 (UTC) - Coordinated Universal Time
  • Sunday, March 22, 2009 at 11:48:29 PM local time at epicenter

  • Time of Earthquake in other Time Zones
    Location 22.80S 174.87W
    Depth 35.0 kilometers
    Region TONGA REGION
    Distances 185 km (115 miles) SSE of NUKU'ALOFA, Tonga
    460 km (285 miles) ESE of Ndoi Island, Fiji
    470 km (290 miles) SSW of Neiafu, Tonga
    1845 km (1150 miles) NE of Auckland, New Zealand
    Location Uncertainty Error estimate: horizontal +/- 15.1 km; depth fixed by location program
    Parameters Nst=29, Nph=29, Dmin=926.7 km, Rmss=1.14 sec, Erho=15.1 km, Erzz=0 km, Gp=124.3 degrees
    Source USGS NEIC (WDCS-D)
    Event ID usemaz

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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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