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Earthquake Hazards Program

Magnitude 4.6 TONGA

Wednesday, July 04, 2007 at 23:54:05 UTC

Preliminary Earthquake Report

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Magnitude 4.6
Date-Time
  • Wednesday, July 04, 2007 at 23:54:05 (UTC) - Coordinated Universal Time
  • Thursday, July 05, 2007 at 12:54:05 PM local time at epicenter

  • Time of Earthquake in other Time Zones
    Location 21.04S 173.12W
    Depth 38 kilometers
    Region TONGA
    Distances 220 km (135 miles) E of NUKU'ALOFA, Tonga
    280 km (175 miles) SSE of Neiafu, Tonga
    405 km (255 miles) WSW of Niue Island
    2115 km (1310 miles) NE of Auckland, New Zealand
    Location Uncertainty Error estimate: horizontal +/- 20.5 km; depth +/- 21.4 km
    Parameters Nst=18, Nph=18, Dmin=801.2 km, Rmss=1.39 sec, Erho=20.5 km, Erzz=21.4 km, Gp=82.6 degrees
    Source USGS NEIC (WDCS-D)
    Event ID usejfn

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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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