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2007 September 28 13:38:58 UTC

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Earthquake Details

  • This event has been reviewed by a seismologist.
Location21.980°N, 142.685°E
Depth261.3 km (162.4 miles)
Distances285 km (175 miles) NW of Farallon de Pajaros, N. Mariana Islands
340 km (210 miles) SSE of Iwo-jima, Volcano Islands, Japan
810 km (510 miles) NNW of SAIPAN, Northern Mariana Islands
960 km (600 miles) NNW of HAGATNA, Guam
Location Uncertaintyhorizontal +/- 5.5 km (3.4 miles); depth +/- 15 km (9.3 miles)
ParametersNST= 99, Nph= 99, Dmin=956.3 km, Rmss=0.78 sec, Gp= 29°,
M-type=centroid moment magnitude (Mw), Version=8
Event IDus2007hvbq
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Earthquake Summary

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Earthquake Summary Poster

  • The following is a release by the United States Geological Survey, National Earthquake Information Center: An earthquake occurred 280 km (175 miles) NW of Farallon de Pajaros, N. Mariana Islands at 7:38 AM MDT, Sep 28, 2007 (11:38 PM local time in United States). The magnitude and location may be revised when additional data and further analysis results are available. No damage is expected.

  • Tectonic Summary

    The Mariana Islands earthquake of September 28, 2007, occurred in the inclined seismic zone that marks the position of the subducted Pacific plate beneath the overriding Philippine Sea plate. The Pacific plate moves to the west with respect to the Philippine Sea plate with a velocity of about 40 mm/yr and thrusts under the Philippine Sea plate at the Mariana Trench. The earthquake represents the release of stress resulting from the distortion of the Pacific plate.

    Earthquakes, such as this one, that have focal depths between 70 and 300 km are commonly termed "intermediate-depth" earthquakes. "Deep-focus" earthquakes, with focal depths greater than 300 km, also occur in the subducted Pacific plate beneath the Mariana island arc. Earthquakes have been reliably located to depths of about 630 km beneath the Marianas arc

    Tsunami Information

    The earthquake locations and magnitudes cited in NOAA tsunami statements and bulletins are preliminary and are superseded by USGS locations and magnitudes computed using more extensive data sets.

    General Tsunami Information