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Home > Outreach Materials > Posters > Mount Oyama Poster image Descriptions |
| Mount Oyama Poster Description |
| In the summer of 2000, the summit volcano Mount Oyama produced several ash and steam eruptions. Accompanied
by numerous earthquakes, these volcanic eruptions forced the evacuation of the entire population of Miyakejima
Island, one of the Izu Islands about 200 kilometers (125 miles) south of Tokyo, Japan.
The three-band composite and color-coded images show the local and regional effects of volcanic eruptions. Ash
aerosols, atmospheric gases, and ash deposits are represented by the different colors seen in the images. Additional
computer processing is able to enhance subtle color differences and produce images in perspective and stereo
views. The composite and processed images allow geologists to study how volcanoes work, atmospheric scientists
to study wind patterns, and risk assessors to monitor geologic hazards.
Scientific data products from NASA’s Earth Observing System (EOS) satellites allow observation and analysis of
environmental changes. The images featured on this poster represent a small sample of the many EOS Data and
Information System (EOSDIS) products useful in studying volcanic eruptions. Back to poster |
| MISR image of Miyakejima |
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The true-color anaglyph (3-D red and blue lenses) image reveals the eruption plume
of volcanic ash rising from Mount Oyama. The lack of structure in the ash aerosols from the
previous day’s eruptions inhibits the 3-D effect, but the broken clouds over Japan show strong 3-D effects Back to poster |
| Mt. Oyama SOI image |
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The sulfur dioxide index (SOI) on a background map displays the high concentration of
sulfur dioxide that was expelled by Mount Oyama on August 18 and pushed southward by winds. Back to poster |
| CERES image |
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The longwave flux image shows hot ash clouds (white) in contrast to cool ice clouds
(green to blue). Changing winds blew the ash both east and west following the Mount Oyama
eruptions of August 28 and 29. Back to poster |
| ASTER ash image |
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The ASTER false-color images show the ash deposits (black areas) in the northeastern part
of the island of Miyakejima produced by the mid-July eruptions and the more extensive ash
deposits (and larger caldera) produced by the late-August eruptions. Back to poster |
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