Surveillance of Nisi-no-Sima Volcanic Island by multispectrum image technique.
The first submarine eruption occurred at the east side of Nisi-no-Sima Island was on 12 April, 1973. Nisi-no-Sima Island is located in the western site (27° 15' N /139° 53' E) of 130 km from the Ogasawara Islands, and is about 650 m long and 25 m high. We know well that this island is one of the summits of an extensive submarine volcano, but we have not any records that the eruption of this volcano was observed in history. After the continuous eruptions in a period of about 8 months, the new active volcanic island was formed in the same site of the first eruption. Taking this opportunity, the Hydrographic Department has started to study the technique of prediction of future eruption about the submarine active volcanoes，especially in Nisi-no-Sima Volcanic Island. The method of study that we have employed for prediction was the surveillance by the multispectrum image camera and the thermal camera. In this paper, the results for our surveillance for Nisi-no-Sima Volcanic Island in case of a superimposed multispectrum image are described. The superimposed multispectrum images are produced by printing simultaneously with a negative film of one band image and a positive film of another band image. Our surveillance was carried out from October 1974 and will be continued in future.
| Main Authors: | , |
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1977
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| Online Access: | http://hdl.handle.net/1834/16318 |
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