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Earthquake Hazards Program

Magnitude 4.4 CENTRAL MID-ATLANTIC RIDGE

Friday, July 06, 2007 at 19:10:19 UTC

Preliminary Earthquake Report

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Magnitude 4.4
Date-Time
  • Friday, July 06, 2007 at 19:10:19 (UTC) - Coordinated Universal Time
  • Friday, July 06, 2007 at 04:10:19 PM local time at epicenter

  • Time of Earthquake in other Time Zones
    Location 8.64N 40.10W
    Depth 10 kilometers
    Region CENTRAL MID-ATLANTIC RIDGE
    Distances 1290 km (800 miles) N of Parnaiba, Piaui, Brazil
    1320 km (820 miles) NNE of Sao Luis, Maranhao, Brazil
    1455 km (900 miles) NE of Belem, Para, Brazil
    2835 km (1760 miles) NNE of BRASILIA, Distrito Federal, Brazil
    Location Uncertainty Error estimate: horizontal +/- 18.2 km; depth fixed by location program
    Parameters Nst=15, Nph=15, Dmin=3888.1 km, Rmss=1.12 sec, Erho=18.2 km, Erzz=0 km, Gp=105.2 degrees
    Source USGS NEIC (WDCS-D)
    Event ID uselby

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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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