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23 pieces of meteorites were recovered in a 10 km triangle area of Tsukuba City, Ushiku City, and Tsuchiura City, Ibaraki prefecture.
Meteorite ablation with fragmentation was severe at 50 km or higher altitudes.
Meteoroids were smashed and made many small fragments by an explosion at 24-25 km altitude.
The intense fragmentation was estimated combined reasons that initial mass was large,
initial velocity was rapid and kinetic strongness of meteorite material.
The meteoritic dust cloud was observed well by photographed and witnessed.
The meteoritic cloud rising movement at stratosphere suggest that the cloud was consist of meteoric material but did not include water.
Photographed at Geological Survey of Japan
(exclude tentative name No.1_B)
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| No.1 replica more glossy than the genuine thing. |
Tentative name No.1_B I found and photographed it 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 a 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 the surface covered a very thin fusion crust. "tear drop" recognized. |
No.18 This fragmented at a low altitude. |
No.21 Narrow line 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
Geological Survey of Japan : A laboratory in impact area.