[ Top ] [ Japanese ]

Hr-HP Tephra Arai, 1962

Abbr.: Hr-HP

• Tephra
• Haruna caldera-forming eruption
• Pleistocene (49 ka)

• Lithofacies: Volcanic ash
• Lithofacies (Minor): Lapilli

• Source: Haruna volcano
• Mode of eruption: Plinian
• Thickness: 3 - 4 cm

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Jumonji, Haruna town, Takasaki city, Gunma pref.

• Ito et al. (2022) Geology of the Kiryu and Ashikaga District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
• Geshi and Takeuchi (2012) Geology of the Haruna San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)
• Yoshikawa et al. (2010) Geology of the Utsunomiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 6p.)