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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)
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| No.1 replica more glossy than genuine thing. |
Tentative name No.1_B I found and photographed soon. |
No.3 Fell on Ushiku city only 1.4g. |
No.4 Fusion crust thickness was 0.5mm or less. |
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| No.7 Ablated well. fragmentation seemed at high altitude. |
No.8 Metal ferrite recognized in fresh cross section. |
No.10 Gray color in cross section. = concrete color. |
No.11_A Breccia material. also No.2. |
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| No.12 What is black material? Impact point is true? |
No.13(Maximum fragment) A part of surface was covered very thin fusion crust. "tear drop" recognized. |
No.18 This fragmented at low altitude. |
No.21 Thread veins are wounds of the case. |
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| No.22 Failed double exposure. |
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Photographed at auto repair shop.
Broken slate roof.
Link
National Science Museum,Tokyo : in Japanese.
Geological Survey of Japan : A laboratory in impact area.