Landslide Characteristics Revealed by High‐Frequency Seismic Waves from the 2017 Landslide in Central Japan

摘要

The recent development of advanced seismograph networks offers us a chance to remotely detect landslide occurrences with high‐frequency (?>～1??Hz?) components. This study examined a landslide in central Japan that produced clearly detectable seismic signals at multiple seismic stations in a permanent network. Wave packets propagated with a group velocity of 3??km/s from the landslide area. Using a source location determination method with amplitude information from the high‐frequency component, the source location of the wave packets was shown to be in the vicinity of the landslide with an error of 5?km. Moreover, seismograms specific to this landslide also contained a distinct impulsive phase with a source located in the vicinity of the landslide. The study demonstrated that seismic waves with a high‐frequency component from landslides can be used to estimate their mechanisms as well as their locations when they are recognized by a routine seismic network.