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23 pieces meteorites recovered in 10 km triangle area at Tsukuba city, Ushiku city and
Tsuchiura city, Ibaragi prefecture.
Meteorite ablation with fragmentation was severe at 50 km or higher altitude.
Meteoroids was smashed and made many small fragments by explosion at 24-25 km altitude.
Severe fragmentation were estimated combined reasons that initial mass was large,
initial velocity was rapid and kinetic strongness of meteorite material.
Meteoritic dust cloud was observed well by photographed and witnessed.
Cloud rising movement at stratosphere suggest that cloud was consist of meteoric material but did't include water.
Photographed at Geological Survey of Japan
(exclude tentative name No.1_B)
than genuine thing.
|Tentative name No.1_B
I found and
Fell on Ushiku city
Fusion crust thickness
was 0.5mm or less.
at high altitude.
Metal ferrite recognized
in fresh cross section.
Gray color in cross section.
= concrete color.
What is black material?
Impact point is true?
A part of surface was covered
very thin fusion crust.
"tear drop" recognized.
at low altitude.
Thread veins are
wounds of the case.
Failed double exposure.
Photographed at auto repair shop.
Broken slate roof.
National Science Museum,Tokyo : in Japanese.
Geological Survey of Japan : A laboratory in impact area.