研究紹介 research introductions chiba university...
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研究紹介Research introductions
Chiba University
千葉大学大学院自然科学研究科像科学専攻Graduate School of Science and Technology, Chiba University
ヨサファット テトォコ スリ スマンティヨJosaphat Tetuko Sri Sumantyo
Sumatera island
Java island
Lampung bay
Legundi island
Sertung island
Panaitan island
Sunda
stra
it
Krakatau volcano
complex
Panjang island
Rakata island
0 15 km
N
Situation map
Banten
Lampung
クラカトア山島群
Indonesia
Volcanoes in Indonesia : 129 volcanoesSumatera : 12 Java : 21 Bali : 2 Nusa Tenggara : 20 Banda sea : 9 North Sulawesi : 6 Sangihe : 5 Halmahera : 5 Krakatau volcano complex (ESDM, Indonesia)
SAR mosaic
ancient Krakatau 60,000 years ago
after gigantic eruption with the lost of volcano dome in 60,000 years ago
Rakata
Panjang
Sertung
caldera before 1883
Rakata
Panjang
sertung
Danan
Perbuwatan
growing up of Rakata, Danan and Perbuwatan volcanoes 17th century
Rakata
Panjang
Sertung
caldera after 1883
paroxymal explotion of Danan and Perbuwatan volcanoes on August 27, 1883 → 36,417 people killed and swept 295 villages
Rakata
Sertung
DananPerbuwatan
Panjang
Rakata, Danan and Perbuwatan volcanoes activities stopped in 1681.
Rakata
Panjang
Sertung
Anak krakatau
Krakatau volcano complex growing slowly nowadays and always create spectacular history …
歴史:クラカトア山島群の誕生
North
① ② ③
④ ⑤ ⑥
0
50
100
150
200
250
300
350
1930 1952 1953 1968 1973 1983 1996
Observation year
Hei
ght [
met
er a
sl] Anak Krakatau
Photographs : ESDM, Indonesia
歴史:クラカトア山島群の誕生
rotated image
North
合成開口レーダ画像生成過程
range compressed image
azimuth compressed image
raw data
sensor illumination
Range
Azim
uth
JERS-1 satellite
No
rth
Full scene of JERS-1 SAR 19980731
Anak Krakatau island
Panjang island
Rakata island
Sertung island
Subset of JERS-1 SAR 19980731
North
North
合成開口レーダ画像生成過程
Landsat TM 19920518
Anak Krakatau island
Panjang island
Rakata island
Sertung island
JERS-1 SAR 19980731
N
N
Panjang islandSertung island
Anak Krakatau island
Rakata island
Map legend
Lav Lavas in 1963, 1972, 1975, 1980
Pca1 Pyroclastic airfall layer of ash, scoriaeous lapilli, sand exposed in 1982.
Pca2 Pyroclastic airfall layer of ash, scoreae, lapilli, sand exposed in 1956.
Smd Material deposit of the rock such as silt, sand or block size, andesites, basaltic andesite, and obsidian fragments
Hal Hyperstene augite andesite lava
Pf 1883 Pyroclastic flow
Bal Basaltic lava
Roc1 Rock distribution
Roc2 Estimated rock distribution
クラカトア山島群地質図とSAR画像の関係
Landsat TM 19920518
Anak Krakatau island
Panjang island
Rakata island
Sertung island
JERS-1 SAR 19980731
N N
Panjang islandSertung island
Anak Krakatau island
Rakata island
Geological cross section
クラカトア山島群地質図とSAR画像の関係
North
0 2 km composited SAR images
19941105
19961122
19980913
19941105
19961122
19980913
クラカトア火山活動
0 50 100-20
-15
-10
-5
0
sigm
a-nu
ll o [
dB]
1994 1996 1998
A B
A
Sea level
Pre-historic Krakatau
Rakata island
Pre-1883 Kraka
tau
Sertung island
Pf 1883Hal
Hal
Bal
Pf 1883
2000m
1500m
1000m
500m
0m
A B
B
後方散乱係数の見方
Sea level
Anak Krakatau islandPanjang island
Pf 1883
Hal
Pre-historic Krakatau
Sea level
Hal Pf 1883
SmdPca2Pca2Lav 1972/1973Pca1
1000m
750m
500m
250m
0m
C D
Pre-h
istor
ic Kra
kata
u
Sertung island
0 50 100-20
-15
-10
-5
0
sigm
a-nu
ll
o [dB
]
1994 1996 1998
C D
C
D
後方散乱係数の見方
Pf 1883
1000m
750m
500m
250m
0m
E F
Anak Krakatau islandPanjang island
Pre-historic Krakatau
Sea level
HalPca2Pca2Lav 1972/1973 Pca1
Smd
0 50 100-20
-15
-10
-5
0
sigm
a-nu
ll
o [dB
]
1994 1996 1998
E F
E
F 後方散乱係数の見方
-20
-15
-10
-5
0 1994 1996 1998
sigm
a-nu
ll
o [dB
]
#1
19941105
19961122
19980913
4 dB5 dB
後方散乱係数と火山活動の関係
-20
-15
-10
-5
0 1994 1996 1998
sigm
a-nu
ll
o [dB
]
#2
19941105
19961122
19980913
後方散乱係数と火山活動の関係
-20
-15
-10
-5
0 1994 1996 1998
sigm
a-nu
ll
o [dB
]
#3
7 dB5 dB
19941105
19961122
19980913
後方散乱係数と火山活動の関係
-20
-15
-10
-5
0 1994 1996 1998
sigm
a-nu
ll
o [dB
]
#4
19941105
19961122
19980913
5 dB3 dB
後方散乱係数と火山活動の関係
Pf 1883 -8 dB
Pca1 -10 dB
Pca2 -6 dB
Lav 1972/1973 -10 dB
Hal -12 dB
Smd -9 dB
Sea surface -16 dB
Backscattering coefficient of each soil type
Radar respons / backscattering coefficient of new lava around Anak Krakatau Volcano
Northern area : 5 ~ 7 dB increased
Western area : 4 ~ 5 dB increased
North-eastern area : 3 ~ 5 dB increased
後方散乱係数と火山活動の関係