Earth, Planets and Space

, Volume 58, Issue 1, pp 63–67 | Cite as

Spatial distribution of F-net moment tensors for the 2005 West Off Fukuoka Prefecture Earthquake determined by the extended method of the NIED F-net routine

  • Takumi MatsumotoEmail author
  • Yoshihiro Ito
  • Hirotoshi Matsubayashi
  • Shoji Sekiguchi
Open Access


The 2005 West Off Fukuoka Prefecture Earthquake with a Japan Meteorological Agency (JMA) magnitude (MJMA) of 7.0 occurred on March 20, 2005. We determined moment tensor solutions, using a surface wave with an extended method of the NIED F-net routine processing. The horizontal distance to the station is rounded to the nearest interval of 1 km, and the variance reduction approach is applied to a focal depth from 2 km with an interval of 1 km. We obtain the moment tensors of 101 events with (MJMA) exceeding 3.0 and spatial distribution of these moment tensors. The focal mechanism of aftershocks is mainly of the strike-slip type. The alignment of the epicenters in the rupture zone of the main-shock is oriented between N110°E and N130°E, which is close to the strike of the main-shock’s moment tensor solutions (N122°E). These moment tensor solutions of intermediatesized aftershocks around the focal region represent basic and important information concerning earthquakes in investigating regional tectonic stress fields, source mechanisms and so on.

Key words

The 2005 West Off Fukuoka Prefecture Earthquake moment tensor broadband seismometer seismicity F-net 


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Copyright information

© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2006

Authors and Affiliations

  • Takumi Matsumoto
    • 1
    Email author
  • Yoshihiro Ito
    • 1
  • Hirotoshi Matsubayashi
    • 1
  • Shoji Sekiguchi
    • 1
  1. 1.National Research Institute for Earth Science and Disaster PreventionTsukuba, IbarakiJapan

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