Water affects many geological and geophysical phenomena, for example, earthquake generation. Recently, anomalous earthquakes, which are strongly related to fluid have been detected in a subduction zone by densely distributed geodetic and seismic observation networks. These are called slow earthquakes and are divided into many categories of earthquakes. The long-term slow slip in Tokai or Bungo Channel, which occurs at the subducting plate interface, is a phenomenon with a very long time-constant ranging from months to years. At the deeper part of the long-term slow slip, the short-term slow slip occurs with a period of several days associated with the non-volcanic deep low-frequency tremor in the transition zone on the plate interface in southwest Japan. These slow earthquakes might be related to fluid liberated from the down-going slab by dehydration process. At the shallower part of the subducting plate interface, the very low-frequency earthquakes occur in the accretionary prism near the Nankai trough. These slow earthquakes indicate a weakening of frictional strength at the plate interface and low stress drop due to the existence of fluid.
CITATION STYLE
OBARA, K. (2007). Slow Earthquake and Water. Journal of Geography (Chigaku Zasshi), 116(1), 114–132. https://doi.org/10.5026/jgeography.116.114
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