Po波はマントル中を伝播する際の散乱によって形成される。そのため、波形が複雑で、コーダ中に含まれているであろう変換波の抽出は行われてこなかった。Tonegawa et al. (2018)では、Poコーダ波の動径成分と鉛直成分の相互相関を計算し、海洋性地殻の基盤やモホ面で変換したPos変換波を抽出することに成功した。さらに抽出したPos変換波を用いて、境界面の見え方や地殻内の異方性構造が海側からアウターライズ域にかけて大きく変化していることを見いだし、その実用性まで実証した。 Click to … もっと読む
Stix and de Moor (2018) compiled recent studies of phreatic eruptions and proposed two endmembers for phreatic systems. Type 1 systems are characterized by a sealed hydrothermal system. Injection of magmatic fluids causes pressurization of the hydrot… もっと読む
Interaction of magmatic-hydrothermal systems often controls styles and evolution of volcanic activities. Shinohara et al. (2018) revealed continuous existence of a hydrothermal system beneath the crater floor even during magmatic eruptions based on o… もっと読む
Yoshifumi Saito, Masaki N. Nishino, Masaki Fujimoto, Tadateru Yamamoto, Shoichiro Yokota, Hideo Tsunakawa, Hidetoshi Shibuya, Masaki Matsushima, Hisayoshi Shimizu, Futoshi Takahashi (2012), Simultaneous observation of the electron acceleration and io… もっと読む
Hisashi Hayakawa, Harufumi Tamazawa, Akito Davis Kawamura, Hiroaki Isobe (2015), Records of sunspot and aurora during CE 960-1279 in the Chinese chronicle of the Sòng dynasty, Earth, Planets and Space, 67:82, doi:10.1186/s40623-015-0250-y In t… もっと読む
It is essential for instruments, that work in space or at or near the target bodies, to be characterized under the actual operating conditions. Establishing the procedure of data processing is important as well. IR2, which cools its sensor and optics… もっと読む
Nakamura et al. (2017) report on the evolution of the near-Earth plasma sheet boundary during an intense substorm. Based on multi-point analysis using the four-spacecraft measurements from Magnetospheric Multiscale (MMS) together with Geotail and GOE… もっと読む
