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  1. Using numerical filtering techniques allowing us to reduce noise from sferics, we are able to clearly study a new type of differently structured very low frequency (VLF) radio waves above f = 4 kHz at the grou...

    Authors: Claudia Martinez-Calderon, Jyrki K. Manninen, Jemina T. Manninen and Tauno Turunen
    Citation: Earth, Planets and Space 2021 73:191
  2. Oxygen is a potential biosignature for terrestrial Earth-like planets. The primary source of oxygen on Earth is oxygenic photosynthesis, which may be limited by the supply of riverine phosphorus. Therefore, ph...

    Authors: Yasuto Watanabe and Eiichi Tajika
    Citation: Earth, Planets and Space 2021 73:188
  3. Low-frequency tremors have been widely detected in many tectonic zones, and are often located adjacent to megathrust zones, indicating that their spatiotemporal evolution provides important insights into megat...

    Authors: Hidenobu Takahashi, Kazuya Tateiwa, Keisuke Yano and Masayuki Kano
    Citation: Earth, Planets and Space 2021 73:186
  4. Using meteor radar, radiosonde observations and MERRA-2 reanalysis data from 12 August to 31 October 2006, we report a dynamical coupling from the tropical lower atmosphere to the mesosphere and lower thermosp...

    Authors: Hao Cheng, Kaiming Huang, Alan Z. Liu, Shaodong Zhang, Chunming Huang and Yun Gong
    Citation: Earth, Planets and Space 2021 73:183
  5. Pliocene volcanic rocks from south-east Austria were paleomagnetically investigated. Samples were taken from 28 sites located on eight different volcanoes. Rock magnetic investigations revealed that magnetic c...

    Authors: Elisabeth Schnepp, Patrick Arneitz, Morgan Ganerød, Robert Scholger, Ingomar Fritz, Ramon Egli and Roman Leonhardt
    Citation: Earth, Planets and Space 2021 73:182
  6. Along the Nankai Trough subduction zone, southwest Japan, short-term slow slip events (SSEs) are commonly detected in strain and tilt records. These observational data have been used in rectangular fault model...

    Authors: Takahiro Tsuyuki, Akio Kobayashi, Reiko Kai, Takeshi Kimura and Satoshi Itaba
    Citation: Earth, Planets and Space 2021 73:181
  7. A volcanic eruption transmits both seismic and infrasound signals. The seismo-acoustic power ratio is widely used to investigate the eruption behaviors and the source dynamics. It is often the case that seismi...

    Authors: Mie Ichihara, Kazuya Yamakawa and Dan Muramatsu
    Citation: Earth, Planets and Space 2021 73:180
  8. Volcano-hydrothermal systems are governed by complex interactions between fluid transport, and geochemical and mechanical processes. Evidence of this close interplay has been testified by distinct spatial and ...

    Authors: Santina Chiara Stissi, Rosalba Napoli, Gilda Currenti, Andrey Afanasyev and Giordano Montegrossi
    Citation: Earth, Planets and Space 2021 73:179
  9. This study aims to synthesize seismic observations with gravity and magnetic data and to suggest a new scenario on the development of the Harrat Lunayyir (HL) tectonic system on the eastern Red Sea coastline, ...

    Authors: Ali K. Abdelfattah, Chokri Jallouli, Mohamed Fnais, Saleh Qaysi, Hassan Alzahrani and Saad Mogren
    Citation: Earth, Planets and Space 2021 73:178
  10. On 10 October 2011, a submarine eruption occurred in El Hierro island. Thus, the eruptive process in the Canary islands was reactivated after 40 years of inactivity. The main objective of this work is to evalu...

    Authors: Sonia Pérez-Plaza, Manuel Berrocoso, Belén Rosado, Gonçalo Prates and Fernando Fernández-Palacín
    Citation: Earth, Planets and Space 2021 73:177
  11. We investigated changes in the b value of the Gutenberg–Richter’s law in and around the focal areas of earthquakes on March 20 and on May 1, 2021, with magnitude (M) 6.9 and 6.8, respectively, which occurred off ...

    Authors: K. Z. Nanjo and A. Yoshida
    Citation: Earth, Planets and Space 2021 73:176
  12. Following the observed pattern of a new geomagnetic jerk every 3–4 years, certain predictions suggested that a new event should occur around 2020 after the one observed around 2017.5. In this work, we explore ...

    Authors: F. Javier Pavón-Carrasco, Santiago Marsal, Saioa A. Campuzano and J. Miquel Torta
    Citation: Earth, Planets and Space 2021 73:175
  13. The gravity field is one of the Earth’s basic physical fields. The geoid can be calculated and the tectonic activity underground can be inversed by gravity anomaly. With the development of various ship-borne g...

    Authors: Zhimin Shi, Junjian Lang, Xinghui Liang, Zhibo Zhou, Aizhi Guo and Lintao Liu
    Citation: Earth, Planets and Space 2021 73:174
  14. Here we investigate the influence of the lithology and thermal state of the upper crust on earthquake distributions beneath the Wakayama region, southern Honshu, Japan, to better understand the influence of cr...

    Authors: Sumire Maeda, Shinji Toda, Toru Matsuzawa, Makoto Otsubo and Takumi Matsumoto
    Citation: Earth, Planets and Space 2021 73:173

    The Correction to this article has been published in Earth, Planets and Space 2021 73:205

  15. Subvolcanic hydrothermal systems can lead to hydrothermal eruptions as well as unrest phenomena without an eruptive event. Historical eruptions and recent unrest events, including ground inflation, demagnetiza...

    Authors: Ryo Tanaka, Yusuke Yamaya, Makoto Tamura, Takeshi Hashimoto, Noritoshi Okazaki, Ryo Takahashi and Toru Mogi
    Citation: Earth, Planets and Space 2021 73:172
  16. The evolution history of the Sea of Japan back-arc basin remains under debate, involving the opening of sub-basins such as the Japan and Yamato Basins. Detailed knowledge of the lithospheric structure will pro...

    Authors: Takeshi Akuhara, Kazuo Nakahigashi, Masanao Shinohara, Tomoaki Yamada, Hajime Shiobara, Yusuke Yamashita, Kimihiro Mochizuki and Kenji Uehira
    Citation: Earth, Planets and Space 2021 73:171
  17. Lithospheric deformation is a fundamental process in plate tectonics. It is, therefore, critical to determine how the lithosphere responds to geological loads to better understand tectonic processes. The litho...

    Authors: Ming-Ju Xu, Zhao-Cai Wu, Fei Ji, Ai-Guo Ruan, Chun-Feng Li and Jin-Yao Gao
    Citation: Earth, Planets and Space 2021 73:170
  18. In this paper, we carried out a series of linear analyses on the onset of thermal convection of highly compressible fluids whose physical properties strongly vary in space in convecting vessels either of a thr...

    Authors: Masanori Kameyama
    Citation: Earth, Planets and Space 2021 73:167
  19. Ringwoodite and wadsleyite are the high-pressure polymorphs of olivine, which are common in shocked meteorites. They are the major constituent minerals in the terrestrial mantle. NWA 8705, an olivine-phyric sh...

    Authors: Ting Zhang, Sen Hu, Nian Wang, Yangting Lin, Lixin Gu, Xu Tang, Xinyu Zou and Mingming Zhang
    Citation: Earth, Planets and Space 2021 73:165
  20. Newly analysed titanomagnetite–ilmenite (Tim–Ilm) intergrowths from Martian nakhlite meteorite Northwest Africa (NWA) 5790 yielded crystallisation temperature up to 1032 °C and oxygen fugacity (fO2) up to ΔQFM + ...

    Authors: Zilong Wang, Wei Tian and Yankun Di
    Citation: Earth, Planets and Space 2021 73:164
  21. Large-amplitude geomagnetically induced currents (GICs) are the natural consequences of the solar–terrestrial connection triggered by solar eruptions. The threat of severe damage of power grids due to the GICs...

    Authors: Yusuke Ebihara, Shinichi Watari and Sandeep Kumar
    Citation: Earth, Planets and Space 2021 73:163
  22. Investigations of the co- and postseismic processes of the 2011 Tohoku-oki earthquake provide essential information on the seismic cycle in the Japan Trench. Although almost all of the source region lies benea...

    Authors: Shun-ichi Watanabe, Tadashi Ishikawa, Yuto Nakamura and Yusuke Yokota
    Citation: Earth, Planets and Space 2021 73:162
  23. Reconstructing the history of Philippine Sea (PHS) plate motion is important for better understanding of the tectonics of the surrounding plates. It is generally considered that the PHS plate migrated northwar...

    Authors: Toshitsugu Yamazaki, Shun Chiyonobu, Osamu Ishizuka, Fumisato Tajima, Naoki Uto and Shinichi Takagawa
    Citation: Earth, Planets and Space 2021 73:161
  24. 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
  25. 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
  26. 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

  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. 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
  34. 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
  35. 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
  36. 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
  37. 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
  38. 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
  39. 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

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