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Earthquake Hazards Program

Magnitude 5.7 SANTA CRUZ ISLANDS

Tuesday, April 21, 2009 at 21:10:03 UTC

Preliminary Earthquake Report

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Magnitude 5.7
Date-Time
  • Tuesday, April 21, 2009 at 21:10:03 (UTC) - Coordinated Universal Time
  • Wednesday, April 22, 2009 at 08:10:03 AM local time at epicenter

  • Time of Earthquake in other Time Zones
    Location 10.84S 165.97E
    Depth 69 kilometers
    Region SANTA CRUZ ISLANDS
    Distances 20 km (15 miles) SE of Lata, Santa Cruz Islands, Solomon Isl.
    445 km (275 miles) E of Kira Kira, San Cristobal, Solomon Isl.
    675 km (420 miles) ESE of HONIARA, Guadalcanal, Solomon Islands
    2280 km (1420 miles) NE of BRISBANE, Queensland, Australia
    Location Uncertainty Error estimate: horizontal +/- 4.5 km; depth +/- 7.6 km
    Parameters Nst=155, Nph=155, Dmin=677.8 km, Rmss=0.62 sec, Erho=4.5 km, Erzz=7.6 km, Gp=29.7 degrees
    Source USGS NEIC (WDCS-D)
    Event ID usfscn

    Location Maps

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    Historic Seismicity

    Theoretical P-Wave Travel Times

     USGS Body-Wave Moment Tensor Solution

     Global CMT Project Moment Tensor Solution

     Historic Moment Tensor Solutions

    Phase (Arrival Time) Data

    Seismic Hazard Map

    Earthquake Density Maps

    Earthquakes: Frequently Asked Questions

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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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