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  1. We describe a new, original approach to the modelling of the Earth’s magnetic field. The overall objective of this study is to reliably render fast variations of the core field and its secular variation. This ...

    Authors: Guillaume Ropp, Vincent Lesur, Julien Baerenzung and Matthias Holschneider

    Citation: Earth, Planets and Space 2020 72:153

    Content type: Full paper

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  2. As posted by the Working Group V of the International Association of Geomagnetism and Aeronomy (IAGA), the 13th generation of the International Geomagnetic Reference Field (IGRF) has been released at the end o...

    Authors: F. Javier Pavón-Carrasco, Santiago Marsal, J. Miquel Torta, Manuel Catalán, Fátima Martín-Hernández and J. Manuel Tordesillas

    Citation: Earth, Planets and Space 2020 72:152

    Content type: Full paper

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  3. We present the CHAOS-7 model of the time-dependent near-Earth geomagnetic field between 1999 and 2020 based on magnetic field observations collected by the low-Earth orbit satellites Swarm, CryoSat-2, CHAMP, SAC-...

    Authors: Christopher C. Finlay, Clemens Kloss, Nils Olsen, Magnus D. Hammer, Lars Tøffner-Clausen, Alexander Grayver and Alexey Kuvshinov

    Citation: Earth, Planets and Space 2020 72:156

    Content type: Full paper

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  4. 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

    Content type: Full paper

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  5. 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

    Content type: Express Letter

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  6. 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

    Content type: Full paper

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  7. 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

    Content type: Full paper

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  8. 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

    Content type: Full paper

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  9. 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

    Content type: Full paper

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  10. 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

    Content type: Full paper

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  11. 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

    Content type: Full paper

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  12. 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

    Content type: Full paper

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  13. 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

    Content type: Full paper

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  14. 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

    Content type: Full paper

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  15. 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

    Content type: Full paper

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  16. 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

    Content type: Full paper

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  17. 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

    Content type: Full paper

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  18. 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

    Content type: Full paper

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  19. 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

    Content type: Express Letter

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  20. 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

    Content type: Technical report

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  21. 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

    Content type: Full paper

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  22. 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

    Content type: Full paper

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  23. 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

    Content type: Full paper

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  24. 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

    Content type: Express Letter

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  25. 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

    Content type: Frontier letter

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  26. 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

    Content type: Full paper

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  27. 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

    Content type: Full paper

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  28. 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

    Content type: Express Letter

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  29. 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

    Content type: Full paper

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  30. 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

    Content type: Full paper

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  31. 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

    Content type: Frontier letter

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  32. 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

    Content type: Express Letter

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  33. 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

    Content type: Express Letter

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  34. 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

    Content type: Full paper

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  35. 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

    Content type: Full paper

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  36. 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

    Content type: Full paper

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  37. 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

    Content type: Express Letter

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  38. 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

    Content type: Full paper

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  39. 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

    Content type: Full paper

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  40. 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

    Content type: Express Letter

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  41. 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

    Content type: Full paper

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  42. 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

    Content type: Full paper

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