1783年浅間山天明噴火で噴出した「火山硫黄毛」 [in Japanese] "Volcanic sulfur thread" of the 1783 Tenmei Eruption, Asama Volcano [in Japanese]
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During the 1783 Asama eruption, volcanic threads were thrown and fell as well as a large quantity of pumice and volcanic ash over the Kanto and the southern part of Tohoku area. We observed and analyzed two samples of the volcanic thread, which were collected and stored by a pharmacopoeia-seller. One is translucent white to pale yellow, and the other is black to dark brown. Our studies with an optical microscope, SEM-EDX and XRD equipment revealed that these volcanic threads are not made of silicate glass as produced in basaltic eruptions, but are made of amorphous sulfur.
- BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN
BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 60(4), 483-486, 2015
The Volcanological Society of Japan