Constraints on the timing of explosive volcanism at Aso and Aira calderas (Japan) between 50 and 30 ka: new insights from the Lake Suigetsu sedimentary record (SG14 core) av McLean, D, Albert, PG, Suzuki, T, Nakagawa, T, Kimura, J-I, Chang, Q, Miyabuchi, Y, Manning, CJ, MacLeod, A, Blockley, SPE, Staff, RA, Yamada, K, Kitaba, I, Yamasaki, A, Haraguchi, T, Kitagawa, J, SG14 Project Members, Smith, VC