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  1. 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

    Content type: Full paper

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  2. 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

    Content type: Express Letter

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  3. 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

    Content type: Full paper

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  4. 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

    Content type: Full paper

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  5. 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

    Content type: Full paper

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  6. 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

    Content type: Full paper

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  7. 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

    Content type: Full paper

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  8. 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

    Content type: Express Letter

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  9. 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

    Content type: Full paper

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  10. 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

    Content type: Full paper

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  11. 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

    Content type: Full paper

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  12. 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

    Content type: Express Letter

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  13. 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

    Content type: Full paper

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  14. 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

    Content type: Express Letter

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  15. 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

    Content type: Full paper

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  16. 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

    Content type: Full paper

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  17. 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

    Content type: Full paper

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  18. 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

    Content type: Full paper

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  19. 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

    Content type: Full paper

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  20. 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

    Content type: Full paper

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  21. 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

    Content type: Express Letter

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  22. 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

    Content type: Full paper

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  23. 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

    Content type: Technical report

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  24. 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

    Content type: Full paper

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  25. 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

    Content type: Express Letter

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

  26. 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

    Content type: Full paper

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  27. 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

    Content type: Full paper

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  28. We have developed ISEE_Wave (Institute for Space-Earth Environmental Research, Nagoya University - Plasma Wave Analysis Tool), an interactive plasma wave analysis tool for electric and magnetic field waveforms...

    Authors: Shoya Matsuda, Yoshizumi Miyoshi, Satoko Nakamura, Masahiro Kitahara, Masafumi Shoji, Tomoaki Hori, Shun Imajo, Chae-Woo Jun, Satoshi Kurita, Yoshiya Kasahara, Ayako Matsuoka and Iku Shinohara

    Citation: Earth, Planets and Space 2021 73:110

    Content type: Technical report

    Published on:

    The Correction to this article has been published in Earth, Planets and Space 2021 73:125

  29. A new technique was developed to estimate the ionospheric total electron content (TEC) from Global Navigation Satellite System (GNSS) satellite signals. The vertically distributed electron density was paramete...

    Authors: Takashi Maruyama, Kornyanat Hozumi, Guanyi Ma, Pornchai Supnithi, Napat Tongkasem and Qingtao Wan

    Citation: Earth, Planets and Space 2021 73:109

    Content type: Full paper

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  30. We surveyed the relationship between the scale of space weather events and their occurrence rate in Japan, and we discussed the social impact of these phenomena during the Project for Solar–Terrestrial Environ...

    Authors: Mamoru Ishii, Daikou Shiota, Chihiro Tao, Yusuke Ebihara, Hitoshi Fujiwara, Takako Ishii, Kiyoshi Ichimoto, Ryuho Kataoka, Kiyokazu Koga, Yuki Kubo, Kanya Kusano, Yoshizumi Miyoshi, Tsutomu Nagatsuma, Aoi Nakamizo, Masao Nakamura, Michi Nishioka…

    Citation: Earth, Planets and Space 2021 73:108

    Content type: Full paper

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  31. The stray current of direct current (DC) railway systems causes magnetic disturbance in geomagnetic measurements, which may complicate the identification of useful information. The magnetic disturbance exhibit...

    Authors: Xuezhen Ding, Yuguo Li, Yunju Wu, Shuangmin Duan, Zhuoxuan Li, Yanxin Yin and Lindong Pan

    Citation: Earth, Planets and Space 2021 73:107

    Content type: Full paper

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  32. We present here an analysis of the destructive Mw 6.2 earthquake sequence that took place on 14 January 2021 in Mamuju–Majene, West Sulawesi, Indonesia. Our relocated foreshocks, mainshock, and aftershocks and...

    Authors: Pepen Supendi, Mohamad Ramdhan, Priyobudi, Dimas Sianipar, Adhi Wibowo, Mohamad Taufik Gunawan, Supriyanto Rohadi, Nelly Florida Riama, Daryono, Bambang Setiyo Prayitno, Jaya Murjaya, Dwikorita Karnawati, Irwan Meilano, Nicholas Rawlinson, Sri Widiyantoro, Andri Dian Nugraha…

    Citation: Earth, Planets and Space 2021 73:106

    Content type: Express Letter

    Published on:

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