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  1. Nine cycles of Haiyang-2A (HY-2A) IGDR (Interim Geophysical Data Record) data are used to derive gravity products over the Gulf of Guinea (15° W–5° E, 4° S–4° N). Firstly, the sea surface heights (SSH) and ver...

    Authors: Xiaoyun Wan, Richard Fiifi Annan and Wenbin Wang
    Citation: Earth, Planets and Space 2020 72:151
  2. Reductive dissolution of magnetite is known to occur below the Fe-redox boundary in sediments. In this study, detailed processes associated with biogenic magnetite dissolution are documented. A sediment core f...

    Authors: Toshitsugu Yamazaki
    Citation: Earth, Planets and Space 2020 72:150
  3. Earth’s internal magnetic field is generated through motion of the electrically conductive iron-alloy fluid comprising its outer core. Temporal variability of this magnetic field, termed secular variation (SV)...

    Authors: Maurits C. Metman, Ciarán D. Beggan, Philip W. Livermore and Jonathan E. Mound
    Citation: Earth, Planets and Space 2020 72:149
  4. The formation of aggregates consisting of snow, water, and tephra has been reported in small-scale experiments on three-phase flows containing tephra, water, and snow, representing lahars triggered by snowmelt...

    Authors: Hirofumi Niiya, Kenichi Oda, Daisuke Tsuji and Hiroaki Katsuragi
    Citation: Earth, Planets and Space 2020 72:148
  5. In this study, we have derived field-aligned currents (FACs) from magnetometers onboard the Defense Meteorological Satellite Project (DMSP) satellites. The magnetic latitude versus local time distribution of F...

    Authors: Chao Xiong, Claudia Stolle, Patrick Alken and Jan Rauberg
    Citation: Earth, Planets and Space 2020 72:147
  6. The technique of spherical elementary current systems (SECS) is a powerful way to determine ionospheric and field-aligned currents (FAC) from magnetic field measurements made by low-Earth-orbiting satellites, ...

    Authors: Heikki Vanhamäki, Astrid Maute, Patrick Alken and Huixin Liu
    Citation: Earth, Planets and Space 2020 72:146
  7. We present detailed maps of local-scale 3D deformation preceding the 2018 phreatic eruption at Iwo-yama volcano (south of Kyushu Island, Japan), using a combination of airborne and spaceborne Interferometric S...

    Authors: Shohei Narita, Taku Ozawa, Yosuke Aoki, Masanobu Shimada, Masato Furuya, Youichiro Takada and Makoto Murakami
    Citation: Earth, Planets and Space 2020 72:145
  8. The 2016 Kumamoto earthquake sequence on April 14 (Mw 6.2) and April 16 (Mw 7.0) altered the regional groundwater level. To better understand the relationship between groundwater level change and surface displace...

    Authors: Kazuya Ishitsuka, Takeshi Tsuji, Weiren Lin, Makoto Kagabu and Jun Shimada
    Citation: Earth, Planets and Space 2020 72:144
  9. Obtaining horizontal edges and the buried depths of geological bodies, using potential field tensor data directly is an outstanding question. The largest eigenvalue of the structure tensor is one of the common...

    Authors: Yuan Yuan, Xiangyu Zhang, Wenna Zhou, Guochao Wu and Weidong Luo
    Citation: Earth, Planets and Space 2020 72:143
  10. We propose a normal-stress-dependent Nagata law. Nagata et al. (J Geophys Res 117:B02314, 2012) revised the rate- and state-dependent friction law by introducing the shear stress dependence. We further extende...

    Authors: Shingo Yoshida, Takuto Maeda and Naoyuki Kato
    Citation: Earth, Planets and Space 2020 72:141
  11. This paper used the similarities between the ionospheres on Mars and Earth, the most similar of the terrestrial planets, to examine the relative importance of photochemical and transport processes at dawn and ...

    Authors: Angeline G. Burrell, Beatriz Sánchez-Cano, Olivier Witasse, Mark Lester and Marco Cartacci
    Citation: Earth, Planets and Space 2020 72:140
  12. The impedance tensor and tipper are shown to be non-causal in some classes of 2-D and 3-D magnetotelluric (MT) models, including those widely encountered off shore. At the same time, examination of a large dat...

    Authors: Nikita Zorin, Dmitry Alekseev, Dmitrii Epishkin, Hisayoshi Shimizu, Denis Yakovlev and Sergey Zaytsev
    Citation: Earth, Planets and Space 2020 72:139
  13. Recent increases in global temperature have stimulated permafrost degradation associated with landform deformation caused by the melting of excess ground ice (thermokarst). Central Yakutia is underlain by ice-...

    Authors: Takahiro Abe, Go Iwahana, Petr V. Efremov, Alexey R. Desyatkin, Takumi Kawamura, Alexander Fedorov, Yuri Zhegusov, Kazuki Yanagiya and Takeo Tadono
    Citation: Earth, Planets and Space 2020 72:138
  14. Site-dependent bulk permittivities of the lunar uppermost media with thicknesses of tens to hundreds meters were estimated based on the data from Lunar Radar Sounder onboard the Selenological and Engineering E...

    Authors: Keigo Hongo, Hiroaki Toh and Atsushi Kumamoto
    Citation: Earth, Planets and Space 2020 72:137

    The Correction to this article has been published in Earth, Planets and Space 2021 73:55

  15. We have submitted a secular variation (SV) candidate model for the thirteenth generation of International Geomagnetic Reference Field model (IGRF-13) using a data assimilation scheme and a magnetohydrodynamic ...

    Authors: Takuto Minami, Shin’ya Nakano, Vincent Lesur, Futoshi Takahashi, Masaki Matsushima, Hisayoshi Shimizu, Ryosuke Nakashima, Hinami Taniguchi and Hiroaki Toh
    Citation: Earth, Planets and Space 2020 72:136
  16. Improving the ability to detect and characterize long-duration volcanic tremor is crucial to understand the long-term dynamics and unrest of volcanic systems. We have applied data reduction methods (permutatio...

    Authors: Ivan Melchor, Javier Almendros, Roberto Carniel, Kostas I. Konstantinou, Marcia Hantusch and Alberto Caselli
    Citation: Earth, Planets and Space 2020 72:134
  17. We developed universal sample holders [the Kochi grid, Kochi clamp, and Okazaki cell) and a transfer vessel (facility-to-facility transfer container (FFTC)] to analyze sensitive and fragile samples, such as ex...

    Authors: Motoo Ito, Naotaka Tomioka, Kentaro Uesugi, Masayuki Uesugi, Yu Kodama, Ikuya Sakurai, Ikuo Okada, Takuji Ohigashi, Hayato Yuzawa, Akira Yamaguchi, Naoya Imae, Yuzuru Karouji, Naoki Shirai, Toru Yada and Masanao Abe
    Citation: Earth, Planets and Space 2020 72:133
  18. We applied differential InSAR analysis to the Shiretoko Peninsula, northeastern Hokkaido, Japan. All the interferograms of long temporal baseline (~ 3 years) processed from SAR data of three L-band satellites ...

    Authors: Youichiro Takada and George Motono
    Citation: Earth, Planets and Space 2020 72:131
  19. We have identified “N”-shaped Y/X amplitude spectral ratios in S-coda records from a significant number of OBSs (ocean bottom seismometers) belonging to in-line-type ocean bottom networks of S-net and ETMC dep...

    Authors: Kaoru Sawazaki and Takeshi Nakamura
    Citation: Earth, Planets and Space 2020 72:130
  20. In the Earth’s inner magnetosphere, there exist regions like plasmasphere, ring current, and radiation belts, where the population of charged particles trapped along the magnetic field lines is more. These par...

    Authors: Pankaj K. Soni, Bharati Kakad and Amar Kakad
    Citation: Earth, Planets and Space 2020 72:129
  21. To improve our understanding of the long-term behavior of low-frequency earthquakes (LFEs) along the tremor belt of the Nankai subduction zone, we applied a matched filter technique to continuous seismic data ...

    Authors: Aitaro Kato and Shigeki Nakagawa
    Citation: Earth, Planets and Space 2020 72:128
  22. National Research Institute for Earth Science and Disaster Resilience (NIED) integrated the land observation networks established since the 1995 Kobe earthquake with the seafloor observation networks establish...

    Authors: Shin Aoi, Youichi Asano, Takashi Kunugi, Takeshi Kimura, Kenji Uehira, Narumi Takahashi, Hideki Ueda, Katsuhiko Shiomi, Takumi Matsumoto and Hiroyuki Fujiwara
    Citation: Earth, Planets and Space 2020 72:126
  23. Statistical distributions are investigated for magnetic storms, sudden commencements (SCs), and substorms to identify the possible amplitude of the one in 100-year and 1000-year events from a limited data set ...

    Authors: Ryuho Kataoka
    Citation: Earth, Planets and Space 2020 72:124
  24. We analyze the regional tsunami hazard along the Sea of Japan coast associated with 60 active faults beneath the eastern margin of the Sea of Japan. We generate stochastic slip distribution using a Monte Carlo...

    Authors: Iyan E. Mulia, Takeo Ishibe, Kenji Satake, Aditya Riadi Gusman and Satoko Murotani
    Citation: Earth, Planets and Space 2020 72:123
  25. The importance of the investigation of magnetic superstorms is not limited to academic interest, because these superstorms can cause catastrophic impact on the modern civilisation due to our increasing depende...

    Authors: Hisashi Hayakawa, José R. Ribeiro, Yusuke Ebihara, Ana P. Correia and Mitsuru Sôma
    Citation: Earth, Planets and Space 2020 72:122
  26. Although fluid behavior along faults has often been associated with earthquakes and hydrocarbon accumulation, few observations of active, ongoing fluid discharge along the faults exist. We conducted a dense-2D...

    Authors: Tetsuro Tsuru, Jin-Oh Park, Kazuo Amakasu, Tetsuo No, Kohsaku Arai, Takahiko Inoue, Seishiro Furuyama, Keiichi Uchida and Yasuyuki Nakamura
    Citation: Earth, Planets and Space 2020 72:121
  27. Red clay widely occupies the seafloor of pelagic environments in middle latitudes, and potentially preserves long paleoceanographic records. We conducted a rock-magnetic study of Pacific Ocean red clay to eluc...

    Authors: Toshitsugu Yamazaki, Wei Fu, Takaya Shimono and Yoichi Usui
    Citation: Earth, Planets and Space 2020 72:120
  28. Interferograms pertaining to large earthquakes typically reveal the occurrence of elastic deformations caused by the earthquake along with several complex surface displacements. In this study, we identified di...

    Authors: Satoshi Fujiwara, Takayuki Nakano and Yu Morishita
    Citation: Earth, Planets and Space 2020 72:119
  29. We determined focal mechanism solutions of microearthquakes and examined the stress field in the low-seismicity region from southern Hokkaido to eastern Aomori, NE Japan. The stress fields determined in this s...

    Authors: Sumire Maeda, Toru Matsuzawa, Tomomi Okada, Hiroshi Katao, Takeyoshi Yoshida, Masahiro Kosuga and Makoto Otsubo
    Citation: Earth, Planets and Space 2020 72:117
  30. Coeruptive deformation helps to interpret physical processes associated with volcanic eruptions. Because phreatic eruptions cause small, localized coeruptive deformation, we sometimes fail to identify plausibl...

    Authors: Yuji Himematsu, Taku Ozawa and Yosuke Aoki
    Citation: Earth, Planets and Space 2020 72:116
  31. The GCOM-C (SHIKISAI) satellite was developed to understand the mechanisms of global climate change. The second-generation global imager (SGLI) onboard GCOM-C is an optical sensor observing wavelengths from 38...

    Authors: Takayuki Kaneko, Atsushi Yasuda, Kenji Takasaki, Shun Nakano, Toshitsugu Fujii, Yoshiaki Honda, Kouji Kajiwara and Hiroshi Murakami
    Citation: Earth, Planets and Space 2020 72:115
  32. Deep-sea turbidites have been utilized to understand the history of past large earthquakes. Surface-sediment remobilization is considered to be a mechanism for the initiation of earthquake-induced turbidity cu...

    Authors: Ken Ikehara, Kazuko Usami and Toshiya Kanamatsu
    Citation: Earth, Planets and Space 2020 72:114
  33. We present the results of the first series of successful two-way laser ranging experiments from a ground station, the Lunar Laser Ranging (LLR) station in Grasse, France, to a spacecraft at lunar distance, the...

    Authors: Erwan Mazarico, Xiaoli Sun, Jean-Marie Torre, Clément Courde, Julien Chabé, Mourad Aimar, Hervé Mariey, Nicolas Maurice, Michael K. Barker, Dandan Mao, Daniel R. Cremons, Sébastien Bouquillon, Teddy Carlucci, Vishnu Viswanathan, Frank G. Lemoine, Adrien Bourgoin…
    Citation: Earth, Planets and Space 2020 72:113
  34. Nishinoshima is an active oceanic island arc volcano situated approximately 1000 km south of Tokyo, Japan. Since 2016, marine electromagnetic observations using ocean bottom electromagnetometers have been cond...

    Authors: Kiyoshi Baba, Noriko Tada, Hiroshi Ichihara, Yozo Hamano, Hiroko Sugioka, Takao Koyama, Akimichi Takagi and Minoru Takeo
    Citation: Earth, Planets and Space 2020 72:112
  35. We investigate the longitudinal structure of the oxygen torus in the inner magnetosphere for a specific event found on 12 September 2017, using simultaneous observations from the Van Allen Probe B and Arase sa...

    Authors: M. Nosé, A. Matsuoka, A. Kumamoto, Y. Kasahara, M. Teramoto, S. Kurita, J. Goldstein, L. M. Kistler, S. Singh, A. Gololobov, K. Shiokawa, S. Imajo, S. Oimatsu, K. Yamamoto, Y. Obana, M. Shoji…
    Citation: Earth, Planets and Space 2020 72:111
  36. The objective of this contribution is to get new insights into the effects of magnetic field variations of natural and anthropogenic origin on broad-band seismic stations. Regarding natural sources of magnetic...

    Authors: J. Díaz, M. Ruiz, J. J. Curto, J. M. Torta, J. Ledo, A. Marcuello and P. Queralt
    Citation: Earth, Planets and Space 2020 72:109
  37. Several laboratory experimental studies of photoemission characteristics of rocks as they fracture have been conducted to elucidate the mechanism of earthquake lightning (EQL). In most of these studies, granit...

    Authors: Yuji Enomoto, Tsuneaki Yamabe, Kazuyuki Mizuhara, Shigeki Sugiura and Hitoshi Kondo
    Citation: Earth, Planets and Space 2020 72:108
  38. Brine samples from the wells in the Kashio mineral spring (an “Arima-type” hot spring at Ooshika-Mura, central Japan) were analyzed to determine the original chemical and isotopic compositions of the deep brin...

    Authors: Fumitake Kusuhara, Kohei Kazahaya, Noritoshi Morikawa, Masaya Yasuhara, Hidemi Tanaka, Masaaki Takahashi and Yuki Tosaki
    Citation: Earth, Planets and Space 2020 72:107
  39. We examined how much large-scale and localized upward and downward currents contribute to the substorm current wedge (SCW), and how they evolve over time, using the THEMIS all-sky imagers (ASIs) and ground mag...

    Authors: Y. Nishimura, L. R. Lyons, C. Gabrielse, J. M. Weygand, E. F. Donovan and V. Angelopoulos
    Citation: Earth, Planets and Space 2020 72:106
  40. Spatial gradients in the primary geomagnetic fields directly contribute to both the amplitudes and phases of inter-station transfer functions (IS-TFs). This suggests that, for the analysis of subsurface resist...

    Authors: Shinya Sato, Tada-nori Goto and Katsuaki Koike
    Citation: Earth, Planets and Space 2020 72:105
  41. The phreatomagmatic eruption at Aso volcano on October 8, 2016, released PDC and fallout up to 320 km from the vent, providing an opportunity to study the dispersal and sedimentation of tephra bearing wet and ...

    Authors: Tomohiro Tsuji, Naoki Nishizaka and Kozo Ohnishi
    Citation: Earth, Planets and Space 2020 72:104
  42. Reconstruction of the eruption history of an active volcano is necessary to elucidate its volcanic activity and to assess the probability of its volcanic eruption. Yokodake volcano in central Japan is the only...

    Authors: Hiroya Nitta, Takeshi Saito and Yorinao Shitaoka
    Citation: Earth, Planets and Space 2020 72:103

    The Correction to this article has been published in Earth, Planets and Space 2020 72:127

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