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  1. Although solar activity may significantly impact the global environment and socioeconomic systems, the mechanisms for solar eruptions and the subsequent processes have not yet been fully understood. Thus, mode...

    Authors: Kanya Kusano, Kiyoshi Ichimoto, Mamoru Ishii, Yoshizumi Miyoshi, Shigeo Yoden, Hideharu Akiyoshi, Ayumi Asai, Yusuke Ebihara, Hitoshi Fujiwara, Tada-Nori Goto, Yoichiro Hanaoka, Hisashi Hayakawa, Keisuke Hosokawa, Hideyuki Hotta, Kornyanat Hozumi, Shinsuke Imada…
    Citation: Earth, Planets and Space 2021 73:159
  2. The visualization of computer simulations is currently undergoing a transition from post-hoc to in-situ visualization in which visualization processes are applied, while the simulation is running. The selectio...

    Authors: Nobuaki Ohno and Akira Kageyama
    Citation: Earth, Planets and Space 2021 73:158
  3. We estimate the mass and energy budgets for the 2018 phreatic eruption of Mt. Motoshirane on Kusatsu–Shirane volcano, Japan, based on data obtained from a network of eight tiltmeters and weather radar echoes. ...

    Authors: Akihiko Terada, Wataru Kanda, Yasuo Ogawa, Taishi Yamada, Mare Yamamoto, Takahiro Ohkura, Hiroshi Aoyama, Tomoki Tsutsui and Shin’ya Onizawa
    Citation: Earth, Planets and Space 2021 73:157

    The Correction to this article has been published in Earth, Planets and Space 2021 73:184

  4. A volcanic ash eruption began on March 1, 2018, and a lava flow was observed on March 6 at Shinmoedake volcano in the Kirishima Volcano Group. The small ash eruptions continued until June 27, 2018. The amounts...

    Authors: Yasuhisa Tajima
    Citation: Earth, Planets and Space 2021 73:156
  5. Natural springs containing volcanic and magmatic components occur in association with these activities. However, features of deeply originated fluids and solutes were less documented from fields, where active ...

    Authors: Takahiro Hosono and Chikashige Yamanaka
    Citation: Earth, Planets and Space 2021 73:155
  6. We conducted magnetotelluric measurements to investigate a large serpentinite complex in the northern Kamuikotan Zone that intruded a Cretaceous–Paleocene forearc sedimentary sequence. The resistivity model we...

    Authors: Hiroshi Ichihara, Toru Mogi, Toshihiro Uchida, Hideyuki Satoh, Yusuke Yamaya, Masakazu Fujii, Shusaku Yamazaki, Kenji Okazaki and Noriko Tada
    Citation: Earth, Planets and Space 2021 73:154
  7. Present day crustal displacement rates can be accurately observed at stations of global navigation satellite system (GNSS), and crustal deformation has been investigated by estimating strain-rate fields from d...

    Authors: Tomohisa Okazaki, Yukitoshi Fukahata and Takuya Nishimura
    Citation: Earth, Planets and Space 2021 73:153
  8. We analyze temporal variations in the travel times of both P and S waves (Vp and Vs) for 14 months at Toyohashi (central Japan) with a continuously operating vibration source that could efficiently produce bot...

    Authors: Rina Suzuki, Koshun Yamaoka, Shuhei Tsuji and Toshiki Watanabe
    Citation: Earth, Planets and Space 2021 73:152
  9. The extreme ultraviolet (EUV) imager, EUVI-B, on board the International Space Station (ISS) under the International Space Station–ionosphere-mesosphere-atmosphere plasmasphere cameras (ISS-IMAP) mission was o...

    Authors: Shin’ya Nakano, Yuta Hozumi, Akinori Saito, Ichiro Yoshikawa, Atsushi Yamazaki, Kazuo Yoshioka and Go Murakami
    Citation: Earth, Planets and Space 2021 73:151
  10. An electrical resistivity model beneath Azumayama Volcano, NE Japan, is explored using magnetotelluric method to probe the magma/hydrothermal fluid distribution. Azumayama is one of the most concerning active ...

    Authors: Masahiro Ichiki, Toshiki Kaida, Takashi Nakayama, Satoshi Miura, Mare Yamamoto, Yuichi Morita and Makoto Uyeshima
    Citation: Earth, Planets and Space 2021 73:150
  11. Polar motion is the movement of the Earth's rotational axis relative to its crust, reflecting the influence of the material exchange and mass redistribution of each layer of the Earth on the Earth's rotation a...

    Authors: Xin Jin, Xin Liu, Jinyun Guo and Yi Shen
    Citation: Earth, Planets and Space 2021 73:147
  12. The east–west component of magnetic field variation (∆D-component) at Davao station (Philippines, geomagnetic latitude: – 2.22˚N) are used to investigate the characteristics of the long-term Inter-Hemispheric Fie...

    Authors: Manjula Ranasinghe, Akiko Fujimoto, Akimasa Yoshikawa and Chandana Jayaratne
    Citation: Earth, Planets and Space 2021 73:146
  13. Thellier-type paleointensity experiments associated with partial thermal remanent magnetization checks have been widely used to determine paleointensity values from volcanic and archaeological media. However, ...

    Authors: Doohee Jeong, Qingsong Liu, Yuhji Yamamoto, Yongjae Yu, Xiang Zhao and Huafeng Qin
    Citation: Earth, Planets and Space 2021 73:144
  14. Basaltic magma becomes more viscous, solid-like (elastic), and non-Newtonian (shear-thinning, non-zero yield stress) as its crystal content increases. However, the rheological effects on bubble bursting and ai...

    Authors: Kana Hashimoto and Ikuro Sumita
    Citation: Earth, Planets and Space 2021 73:143
  15. This study presents the first hydrogeochemical model of the hydrothermal systems of Turrialba and Irazú volcanoes in central Costa Rica, manifested as thermal springs, summit crater lakes, and fumarolic degass...

    Authors: D. Rouwet, R. Mora-Amador, C. Ramírez, G. González, E. Baldoni, G. Pecoraino, S. Inguaggiato, B. Capaccioni, F. Lucchi and C. A. Tranne
    Citation: Earth, Planets and Space 2021 73:142
  16. On January 23, 2018, a small phreatic eruption (VEI = 1) occurred at the Motoshirane Pyroclastic Cone Group in the southern part of Kusatsu-Shirane Volcano in central Japan. The eruption ejected ash, lapillus,...

    Authors: Nobuko Kametani, Yasuo Ishizaki, Mitsuhiro Yoshimoto, Fukashi Maeno, Akihiko Terada, Ryuta Furukawa, Ryo Honda, Yoshihiro Ishizuka, Jiro Komori, Masashi Nagai and Shinji Takarada
    Citation: Earth, Planets and Space 2021 73:141
  17. Van Allen Probes in situ observations are used to examine detailed subpacket structure observed in strong VLF (very low frequency) rising-tone chorus elements observed at the time of a rapid MeV electron energ...

    Authors: John C. Foster, Philip J. Erickson and Yoshiharu Omura
    Citation: Earth, Planets and Space 2021 73:140
  18. Kusatsu-Shirane volcano is one of the active volcanoes in Japan. Phreatic explosions occurred in Mt. Shirane in 1983 and most recently, in 2018, in Mt. Motoshirane. Information on the subsurface structure is c...

    Authors: Takao Koyama, Wataru Kanda, Mitsuru Utsugi, Takayuki Kaneko, Takao Ohminato, Atsushi Watanabe, Hiroshi Tsuji, Taro Nishimoto, Alexey Kuvshinov and Yoshiaki Honda
    Citation: Earth, Planets and Space 2021 73:139
  19. The electromagnetic (EM) field variations capable of probing the electrical conductivity of the upper mantle and mantle transition zone have a period range between a few hours and 1 day. At these periods, the ...

    Authors: Géraldine Zenhäusern, Alexey Kuvshinov, Martina Guzavina and Astrid Maute
    Citation: Earth, Planets and Space 2021 73:136
  20. In the present study, we propose a new approach for determining earthquake hypocentral parameters. This approach integrates computed theoretical seismograms and deep machine learning. The theoretical seismogra...

    Authors: Daisuke Sugiyama, Seiji Tsuboi and Yohei Yukutake
    Citation: Earth, Planets and Space 2021 73:135
  21. To construct the Mesozoic apparent polar wander path (APWP) for the inner arc of the southwestern Japanese islands (referred to as southwest Japan) and compare it to that of East Asia, a 110 Ma paleomagnetic p...

    Authors: Koji Uno, Yuta Idehara, Daichi Morita and Kuniyuki Furukawa
    Citation: Earth, Planets and Space 2021 73:132
  22. In this paper, numerical computations are carried out to investigate the seismo-electromagnetic signals arising from the motional induction effect due to an earthquake source embedded in 3-D multi-layered medi...

    Authors: Hengxin Ren, Ling Zeng, Yao-Chong Sun, Ken’ichi Yamazaki, Qinghua Huang and Xiaofei Chen
    Citation: Earth, Planets and Space 2021 73:130
  23. We study the influence of real structure of electromagnetic ion-cyclotron wave packets in the Earth’s radiation belts on precipitation of relativistic electrons. Automatic algorithm is used to distinguish isol...

    Authors: Veronika S. Grach, Andrei G. Demekhov and Alexey V. Larchenko
    Citation: Earth, Planets and Space 2021 73:129
  24. Rapid estimation of the coseismic fault model for medium-to-large-sized earthquakes is key for disaster response. To estimate the coseismic fault model for large earthquakes, the Geospatial Information Authori...

    Authors: Keitaro Ohno, Yusaku Ohta, Satoshi Kawamoto, Satoshi Abe, Ryota Hino, Shunichi Koshimura, Akihiro Musa and Hiroaki Kobayashi
    Citation: Earth, Planets and Space 2021 73:127
  25. Slow slip and tremor (SST) downdip of the seismogenic zones may trigger megathrust earthquakes by frequently transferring stress to seismogenic zones. Geodetic observations have suggested that the recurrence i...

    Authors: Naoki Nishiyama, Kohtaro Ujiie and Masayuki Kano
    Citation: Earth, Planets and Space 2021 73:126
  26. This paper demonstrates and assesses the capability of the advanced three-dimensional (3-D) ionosphere tomography technique, during severe conditions. The study area is northeast Asia and quasi-Japan-centred. ...

    Authors: Nicholas Ssessanga, Mamoru Yamamoto and Susumu Saito
    Citation: Earth, Planets and Space 2021 73:124
  27. As a basis for the electrical tomography of laboratory-scale rock samples (~ 10 cm), we developed a procedure for stable, multi-point, electrical measurement on rock samples that is effective even at high cont...

    Authors: Takeshi Suzuki, Ryokei Yoshimura, Ken’ichi Yamazaki and Naoto Oshiman
    Citation: Earth, Planets and Space 2021 73:123
  28. Japan Aerospace Exploration Agency (JAXA) will launch a spacecraft in 2024 for a sample return mission from Phobos (Martian Moons eXploration: MMX). Touchdown operations are planned to be performed twice at di...

    Authors: Wataru Fujiya, Yoshihiro Furukawa, Haruna Sugahara, Mizuho Koike, Ken-ichi Bajo, Nancy L. Chabot, Yayoi N. Miura, Frederic Moynier, Sara S. Russell, Shogo Tachibana, Yoshinori Takano, Tomohiro Usui and Michael E. Zolensky
    Citation: Earth, Planets and Space 2021 73:120
  29. A phreatic eruption suddenly occurred at Motoshirane (Kusatsu-Shirane volcano, Japan) at 10:02 JST on January 23, 2018. A member of the Japan Self-Defense Force was killed by volcanic blocks during training in...

    Authors: Eiichi Sato
    Citation: Earth, Planets and Space 2021 73:117

    The Correction to this article has been published in Earth, Planets and Space 2021 73:128

  30. We search in the continuous GPS 3-D displacement data for the signals of the normal modes of Earth’s free oscillation that were excited by the 2011 Mw 9.0 Tohoku earthquake. A previous study has reported such ...

    Authors: Cheng-Yin Chu, Benjamin F. Chao, Hao Ding and Linguo Yuan
    Citation: Earth, Planets and Space 2021 73:114
  31. We analyze global characteristics of the westward-propagating quasi-16-day wave (Q16DW) with zonal wavenumber 1 (W1) in the troposphere and stratosphere using zonal wind, meridional wind, vertical velocity, te...

    Authors: Wei Li, Chunming Huang and Shaodong Zhang
    Citation: Earth, Planets and Space 2021 73:113

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