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2015’10.01・Thu

日帰り 繰り上げ出帆ガイド (10:15~14:00)

Izu-Oshima
TokyoTakesiba is about 108.6km away from here in a straight line.
An active volcanic island in the Pacific Ocean Sagami Bay on the Philippine Sea plate.
13km north-northwest south-southeast 9km ENE-WSW
Island cover an area of 91.06k㎡
Households 4,806 Population 8,194(2015/08/01)

Mt.Mihara
Elevation(altitude) 758m
Latitude 34°43′29″  Longitude139°23′41″
Basaltic volcano- Silicon dioxide content 51-53wt%
Style of eruption - scoria→lava flow→volcanic ash
Recent eruption of Mt. Mihara
1986.11.15 17:25 (summit A crater)
1986.11.21 16:15 (frank eruption B1~B8 crater)
1986.11.21. 17:47(frank eruption C1~C11crater)
C6 lava flow was imminent in Motomati in oshima→seek shelter off the island for one mouth.
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「Itadori虎杖in japanese」 Japanese knotweed - Fallopia japonica
pioneer plant after eruption
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wrechage of plane was sighted on the lip of the cardera of Mt. Mihara
63years ago.

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go down to the collapse caldera floor. this cardera was made 1700-1750 years ago. Member S2 アンドラーシュ ワグナーさん(ハンガリー 30歳) 後ろはパパ
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アンタル・ワグナーさん(ハンガリー 63歳 地質学専攻の理学博士)
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「Sennburi」-Swertia japonica Makino
Decoction of bowel medicine
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「Ashitaba」 of as a vegetableー Angelica Keiskei
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「Nannban kiseru」 Aeginetia indica L
leafless parasitic plant of the Japanese pampas grass
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「Akadare」 red gully - iron content included in the magma touched atmospheric oxygen and was oxidized.
scoria corn of 8th centuries - lava wall-aa lava (1778.11.06)in the An'ei era during the Edo period.
An'ei large-scale eruption(1777.08.31-1792) Member Y1
赤だれ
they are climbing Mt.Mihara,summit A crater.
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take a souvenir picture in front of summit A crater
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Frank eruption
for the first time in 565 years
Andesitic eruption - silicon dioxide content 53.5 -67wt%
Main magma reservoir depth 9km →summit crater(basaltic magma)
Vice-magma reservoir depth 4-5km →frank eruption B1-B8crater(andesitic magma)
IMG_convert_20151002180907.jpg

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Frank eruption mouth just after the 1986 year eruption.
B1-B2-B3 crater
Quotes from Motomaro Sirawo's picture
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If it is fine, you see Japan's highest Mount Fuji.
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「URASABAKU」 this slope turned into desert on the way of the strong prevailing wind. southwest wind , northeast wind
Even if a seed is implanted, it is spurted and wind cannot germinate.

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Geological cut surface
97 stratum
formation N4←S2←O1←O2←............←O95      N4(750) S2(300) O95(15,000-19,700BP)
a strata - tree layer ー lower- Scoria, middle- Ash, upper- Aeolian deposit(air-fall deposits)
the incommensurate stratum is a thing caused by the erosion.

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You arrived at the Okada Port five minutes before a start on a voyage.
It was a busy guide,but how about the geo-site of Izu-Oshima is
Please take care. Let's meet again sometime.
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Quotes from Dr.Tsukui
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Quotes from papers in Meteorology and Geophysics
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