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  1. 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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  2. 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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  3. 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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  4. 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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  5. 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

  6. 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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  7. 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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  8. 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

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

  9. 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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  10. 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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  11. 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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  12. 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

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  13. This study investigates the medium-scale traveling ionospheric disturbances (MSTIDs) statistically at the low-latitude equatorial ionization anomaly (EIA) region in the northern hemisphere. We apply the automa...

    Authors: Pin-Hsuan Cheng, Charles Lin, Yuichi Otsuka, Hanli Liu, Panthalingal Krishanunni Rajesh, Chia-Hung Chen, Jia-Ting Lin and M. T. Chang

    Citation: Earth, Planets and Space 2021 73:105

    Content type: Full paper

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  14. An amendment to this paper has been published and can be accessed via the original article.

    Authors: Takashi Tonegawa, Toshinori Kimura, Kazuya Shiraishi, Suguru Yabe, Yoshio Fukao, Eiichiro Araki, Masataka Kinoshita, Yoshinori Sanada, Seiichi Miura, Yasuyuki Nakamura and Shuichi Kodaira

    Citation: Earth, Planets and Space 2021 73:104

    Content type: Correction

    Published on:

    The original article was published in Earth, Planets and Space 2021 73:89

  15. Thick sediment layers frequently cover the Japan islands’ surface, and their frictional properties significantly affect the shallow slip behavior that occurs during earthquakes. However, laboratory data on the...

    Authors: Kazuo Mizoguchi, Shin-ichi Uehara, Takehiro Hirose and Sachiko Iizuka

    Citation: Earth, Planets and Space 2021 73:101

    Content type: Full paper

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  16. We make trial binary forecasts for the Kurile–Japan subduction zone for the period 1988–2014 by hypothesizing that seismic quiescence (i.e., the absence of earthquakes of M ≥ 5 for a minimum period of Tq) is a pr...

    Authors: Kei Katsumata and Masao Nakatani

    Citation: Earth, Planets and Space 2021 73:100

    Content type: Full paper

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  17. Increasing ice loss of the Antarctic Ice Sheet (AIS) due to global climate change affects the orientation of the Earth’s spin axis with respect to an Earth-fixed reference system (polar motion). Here the contr...

    Authors: Franziska Göttl, Andreas Groh, Michael Schmidt, Ludwig Schröder and Florian Seitz

    Citation: Earth, Planets and Space 2021 73:99

    Content type: Full paper

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    The Correction to this article has been published in Earth, Planets and Space 2021 73:133

  18. An amendment to this paper has been published and can be accessed via the original article.

    Authors: Keita Nakamoto, Yoshihiro Hiramatsu, Takahiko Uchide and Kazutoshi Imanishi

    Citation: Earth, Planets and Space 2021 73:98

    Content type: Correction

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    The original article was published in Earth, Planets and Space 2021 73:59

  19. On November 11, 2018, an event generating long-lasting, monotonic long-period surface waves was observed by seismographs around the world. This event occurred at around 09:28 UTC east of the Mayotte Island, in...

    Authors: Hossein Sadeghi and Sadaomi Suzuki

    Citation: Earth, Planets and Space 2021 73:97

    Content type: Full paper

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  20. We attempted to reproduce the total electron content (TEC) variation in the Earth's atmosphere from the temporal variation of the solar flare spectrum of the X9.3 flare on September 6, 2017. The flare spectrum...

    Authors: Kyoko Watanabe, Hidekatsu Jin, Shohei Nishimoto, Shinsuke Imada, Toshiki Kawai, Tomoko Kawate, Yuichi Otsuka, Atsuki Shinbori, Takuya Tsugawa and Michi Nishioka

    Citation: Earth, Planets and Space 2021 73:96

    Content type: Full paper

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  21. Nonlinear processes associated with the generation process of whistler-mode chorus emissions are summarized. The nonlinear dynamics of energetic electrons interacting with a coherent whistler-mode wave and the...

    Authors: Yoshiharu Omura

    Citation: Earth, Planets and Space 2021 73:95

    Content type: Frontier Letter

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    The Correction to this article has been published in Earth, Planets and Space 2021 73:121

  22. An amendment to this paper has been published and can be accessed via the original article.

    Authors: Alexey Kuvshinov, Alexander Grayver, Lars Tøfner‑Clausen and Nils Olsen

    Citation: Earth, Planets and Space 2021 73:94

    Content type: Correction

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    The original article was published in Earth, Planets and Space 2021 73:67

  23. The Martian Moons Exploration (MMX) spacecraft is a JAXA mission to Mars and its moons Phobos and Deimos. MMX will be equipped with the Circum-Martian Dust Monitor (CMDM) which is a newly developed light-weight (

    Authors: Harald Krüger, Masanori Kobayashi, Peter Strub, Georg-Moragas Klostermeyer, Maximilian Sommer, Hiroshi Kimura, Eberhard Grün and Ralf Srama

    Citation: Earth, Planets and Space 2021 73:93

    Content type: Full paper

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  24. High-resolution Moho and lithosphere–asthenosphere boundary depth models for Vietnam and its surrounding areas are determined based on a recently released geoid model constructed from surface and satellite gra...

    Authors: Dinh Toan Vu, Sylvain Bonvalot, Sean Bruinsma and Luyen K. Bui

    Citation: Earth, Planets and Space 2021 73:92

    Content type: Full paper

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  25. Homogeneous and accurate hypocenter distribution along the Japan Trench is important to better understand the process of plate subduction and the occurrence mode of large earthquakes. The seafloor seismic netw...

    Authors: Koji Tamaribuchi, Fuyuki Hirose, Akemi Noda, Yuriko Iwasaki, Kazuhiro Iwakiri and Hiroshi Ueno

    Citation: Earth, Planets and Space 2021 73:91

    Content type: Full paper

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  26. In the coupled electric interaction of rock fractures and gas invasion, that is, when gases interact with newly created crack surfaces, the unpaired electrons within the rock crystal defects are thermally stim...

    Authors: Yuji Enomoto, Tsuneaki Yamabe, Shigeki Sugiura and Hitoshi Kondo

    Citation: Earth, Planets and Space 2021 73:90

    Content type: Express Letter

    Published on:

    The Correction to this article has been published in Earth, Planets and Space 2021 73:149

  27. Lateral spatial variations of weak portions at the plate boundary in subduction zones have been estimated primarily by the distribution of slow earthquakes mainly occurring around seismogenic zones. However, t...

    Authors: Takashi Tonegawa, Toshinori Kimura, Kazuya Shiraishi, Suguru Yabe, Yoshio Fukao, Eiichiro Araki, Masataka Kinoshita, Yoshinori Sanada, Seiichi Miura, Yasuyuki Nakamura and Shuichi Kodaira

    Citation: Earth, Planets and Space 2021 73:89

    Content type: Full paper

    Published on:

    The Correction to this article has been published in Earth, Planets and Space 2021 73:104

  28. Geomagnetically induced currents (GICs) in a quasi-meridional power transmission line on the Kola Peninsula are analyzed during the intervals of Pc5/Pi3 (frequency range from 1.5 to 5 mHz) pulsations recorded ...

    Authors: Nadezda V Yagova, Vyacheslav A Pilipenko, Yaroslav A Sakharov and Vasily N Selivanov

    Citation: Earth, Planets and Space 2021 73:88

    Content type: Full paper

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  29. The number of satellites equipped with retroreflectors dedicated to Satellite Laser Ranging (SLR) increases simultaneously with the development and invention of the spherical geodetic satellites, low Earth orb...

    Authors: Dariusz Strugarek, Krzysztof Sośnica, Daniel Arnold, Adrian Jäggi, Radosław Zajdel and Grzegorz Bury

    Citation: Earth, Planets and Space 2021 73:87

    Content type: Full paper

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  30. The geometries (i.e., dip angles) of active faults from the surface to the seismogenic zone are the most important factors used to evaluate earthquake ground motion, which is crucial for seismic hazard assessm...

    Authors: Hayami Nishiwaki, Takamoto Okudaira, Kazuhiko Ishii and Muneki Mitamura

    Citation: Earth, Planets and Space 2021 73:86

    Content type: Full paper

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  31. The eastward- and westward-traveling 10-day waves with zonal wavenumbers up to 6 from surface to the middle mesosphere during the recent 12 years from 2007 to 2018 are deduced from MERRA-2 data. On the basis o...

    Authors: Chunming Huang, Wei Li, Shaodong Zhang, Gang Chen, Kaiming Huang and Yun Gong

    Citation: Earth, Planets and Space 2021 73:85

    Content type: Full paper

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  32. An amendment to this paper has been published and can be accessed via the original article.

    Authors: Takane Hori, Ryoichiro Agata, Tsuyoshi Ichimura, Kohei Fujita, Takuma Yamaguchi and Takeshi Iinuma

    Citation: Earth, Planets and Space 2021 73:84

    Content type: Correction

    Published on:

    The original article was published in Earth, Planets and Space 2021 73:41

  33. Crustal architecture strongly influences the development and emplacement of mineral zones. In this study, we image the crustal structure beneath a metallogenic belt and its surroundings in the Bayankhongor are...

    Authors: Matthew J. Comeau, Michael Becken, Alexey V. Kuvshinov and Sodnomsambuu Demberel

    Citation: Earth, Planets and Space 2021 73:82

    Content type: Full paper

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  34. Direct sampling and analysis of fumarolic gas was conducted at Ebinokogen Ioyama volcano, Japan, between December 2015 and July 2020. Notable changes in the chemical composition of gases related to volcanic ac...

    Authors: Takeshi Ohba, Muga Yaguchi, Urumu Tsunogai, Masanori Ito and Ryo Shingubara

    Citation: Earth, Planets and Space 2021 73:81

    Content type: Full paper

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  35. Since the beginning of the twenty-first century, volcanic unrest has occurred every 2–5 years at Hakone volcano. After the 2015 eruption, unrest activity changed significantly in terms of seismicity and geoche...

    Authors: Kazutaka Mannen, Yuki Abe, Yasushi Daita, Ryosuke Doke, Masatake Harada, George Kikugawa, Naoki Honma, Yuji Miyashita and Yohei Yukutake

    Citation: Earth, Planets and Space 2021 73:80

    Content type: Full paper

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  36. X-rays and extreme ultraviolet (EUV) emissions from solar flares rapidly change the physical composition of the Earth’s thermosphere and ionosphere, thereby causing space weather phenomena such as communicatio...

    Authors: Shohei Nishimoto, Kyoko Watanabe, Toshiki Kawai, Shinsuke Imada and Tomoko Kawate

    Citation: Earth, Planets and Space 2021 73:79

    Content type: Full paper

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  37. We present first results for the determination of UT1-UTC using the VLBI Global Observing System (VGOS). During December 2019 through February 2020, a series of 1 h long observing sessions were performed using...

    Authors: Rüdiger Haas, Eskil Varenius, Saho Matsumoto and Matthias Schartner

    Citation: Earth, Planets and Space 2021 73:78

    Content type: Express Letter

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  38. Magnetotelluric (MT) data processing can increase the reliability of measured data. Traditional MT data denoising methods are usually applied to entire MT time-series, which results in the loss of useful MT si...

    Authors: Xian Zhang, Jin Li, Diquan Li, Yong Li, Bei Liu and Yanfang Hu

    Citation: Earth, Planets and Space 2021 73:76

    Content type: Full paper

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