Comparison between the two triggered landslides in Mid-Niigata, Japan by July 13 heavy rainfall and October 23 intensive earthquakes in 2004 |
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| Authors: | Hiromitsu Yamagishi Junko Iwahashi |
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| Institution: | (1) Niigata University, 8050 Ikarashi 2-no-cho, Niigata 950-2181, Japan;(2) Geographical Survey Institute, Kitago 1, Tsukuba 305-0811, Japan |
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| Abstract: | On July 13, 2004, heavy rainfalls because of the intensive activities of the rain front occurred in the Mid-Niigata Region,
Japan. They were as much as 400 mm in 24 h, bringing about serious flooding by breaking the river banks. The heavy rainfalls
also triggered more than 3,500 landslides. Three months later, the southern region of Mid-Niigata was attacked by an earthquake
of magnitude 6.8 on the Richter scale on October 23, 2004. The main earthquakes were followed by intensive aftershocks, which
continued until December 2004. By these earthquakes, variable landslides of more than 4,400 also occurred in the hilly and
mountainous areas. Namely, different triggers brought about the variable landslides in the hilly mountains whose features
are very similar in geological and geomorphological points of view. Therefore, these two events are very useful for clearing
the difference in features of the landslides between the two. We have been researching on both landslides in the field just
after both occurred and later analyzing air photographs using the geographic information system (GIS). In this paper, we describe
the comparison in the distribution features using GIS analytical data between the heavy rainfall-induced and the intensive
earthquake-induced landslides. |
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| Keywords: | Landslides Heavy rainfalls Intensive earthquakes GIS analyses Mid-Niigata |
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