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  1. 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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  2. 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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  3. 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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  4. 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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  5. 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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  6. 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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  7. 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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  8. 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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  9. 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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  10. 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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  11. 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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  12. 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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  13. 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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  14. 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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  15. 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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  16. 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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  17. 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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  18. 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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  19. 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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  20. 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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  21. 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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  22. 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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  23. 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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  24. 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

    Content type: Full paper

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  25. 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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  26. 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

    Content type: Full paper

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  27. 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

    Content type: Full paper

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

  28. An inclusive rock-magnetic and absolute paleointensity survey of the ~ 2-ka-old Xitle volcano (southerly Basin of Mexico) was undertaken to assess the faithfulness of the paleomagnetic log carried by fresh, wi...

    Authors: Juan Morales, Nayeli Pérez-Rodríguez, Avto Goguitchaichvili and Miguel Cervantes-Solano

    Citation: Earth, Planets and Space 2020 72:101

    Content type: Full paper

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  29. We studied the space weather effects on the South Atlantic Anomaly (SAA) magnetic response using Tsyganenko models. For the physical parameters characterizing the SAA, the study considered the minimum magnetic...

    Authors: Kirolosse M. Girgis, Tohru Hada and Shuichi Matsukiyo

    Citation: Earth, Planets and Space 2020 72:100

    Content type: Full paper

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  30. The central Australian Musgrave Province at the junction of the South, North and West Australian cratons has undergone and continues to retain evidence of significant whole-of-crust, and most likely ‘whole-of-...

    Authors: Stephan Thiel, Bruce R. Goleby, Mark J. Pawley and Graham Heinson

    Citation: Earth, Planets and Space 2020 72:98

    Content type: Full paper

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  31. We report a chemical assessment of the explosive chamber in the projector system used during the sampling operation of the Hayabusa2 project at the surface of the C-type asteroid Ryugu. Although the explosion ...

    Authors: Yoshinori Takano, Keita Yamada, Chisato Okamoto, Hirotaka Sawada, Ryuji Okazaki, Kanako Sakamoto, Yoko Kebukawa, Kento Kiryu, Takazo Shibuya, Motoko Igisu, Hajime Yano and Shogo Tachibana

    Citation: Earth, Planets and Space 2020 72:97

    Content type: Technical report

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  32. Using a ground-based five-wavelength photometer, which has been operative in Tromsø, Norway since February 2017, we have statistically analyzed the lifetime of O(1S) to reveal the emission altitude of pulsating a...

    Authors: Yuki Kawamura, Keisuke Hosokawa, Satonori Nozawa, Yasunobu Ogawa, Tetsuya Kawabata, Shin-Ichiro Oyama, Yoshizumi Miyoshi, Satoshi Kurita and Ryoichi Fujii

    Citation: Earth, Planets and Space 2020 72:96

    Content type: Full paper

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  33. Using a whole atmosphere–ionosphere coupled model GAIA (ground-to-topside model of atmosphere and ionosphere), we have investigated which parameters mainly control day-to-day variation of vertical plasma drift...

    Authors: Priyanka Ghosh, Yuichi Otsuka, Sivakandan Mani and Hiroyuki Shinagawa

    Citation: Earth, Planets and Space 2020 72:93

    Content type: Express Letter

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  34. We have observed very long period earthquakes (VLPs) over the period 2007 to the end of 2019 at Whakaari/White Island volcano, New Zealand. The earthquakes exhibit similitude between waveforms which suggests r...

    Authors: Iseul Park, Arthur Jolly, Ivan Lokmer and Ben Kennedy

    Citation: Earth, Planets and Space 2020 72:92

    Content type: Full paper

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  35. Atmospheric delays are known to cause biases in Global Navigation Satellite System Reflectometry (GNSS-R) altimetry applications, such as for sea-level monitoring. The main quantity of interest is the reflecti...

    Authors: Thalia Nikolaidou, Marcelo Santos, Simon D. P. Williams and Felipe Geremia-Nievinski

    Citation: Earth, Planets and Space 2020 72:91

    Content type: Full paper

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  36. Deep low-frequency tremors and short-term slow slip events (SSEs) are known to occur along the Nankai Trough in Japan. Although short-term SSEs are thought to occur repeatedly in the northern part of Ise Bay, ...

    Authors: Yuichi Kitagawa, Norio Matsumoto and Takeshi Kimura

    Citation: Earth, Planets and Space 2020 72:90

    Content type: Full paper

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  37. Marine gravimeter has been proved to be the primary technique to efficiently obtain middle-to-short wavelength signals of the earth’s gravity field in geodesy, geodynamics and marine sciences research. In rece...

    Authors: Yuan Yuan, Jinyao Gao, Zhaocai Wu, Zhongyan Shen and Guochao Wu

    Citation: Earth, Planets and Space 2020 72:89

    Content type: Technical report

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  38. We introduce a network observation of anomalous long-distance propagation of aeronautical navigation (NAV) very high-frequency (VHF) radio waves due to sporadic E layer (Es). The system has been operative sinc...

    Authors: Keisuke Hosokawa, Jun Sakai, Ichiro Tomizawa, Susumu Saito, Takuya Tsugawa, Michi Nishioka and Mamoru Ishii

    Citation: Earth, Planets and Space 2020 72:88

    Content type: Technical report

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  39. To support monitoring subtle effects in the Earth system such as a mean sea level rise of 3 mm/year, a next-generation VLBI system, the VLBI Global Observing System (VGOS), has been developed and a new VGOS st...

    Authors: Matthias Schartner, Johannes Böhm and Axel Nothnagel

    Citation: Earth, Planets and Space 2020 72:87

    Content type: Full paper

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  40. The southwestern Kuril trench is seismically active due to the subduction of the Pacific plate. Great earthquakes in this zone have frequently induced fatal disasters. Seismic monitoring and hypocenter catalog...

    Authors: Masayoshi Ichiyanagi, Valentin Mikhaylov, Dmitry Kostylev, Yuri Levin and Hiroaki Takahashi

    Citation: Earth, Planets and Space 2020 72:86

    Content type: Technical report

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  41. The precise orbit of the Hayabusa2 spacecraft with respect to asteroid Ryugu is dynamically determined using the data sets collected by the spacecraft’s onboard laser altimeter (LIght Detection And Ranging, LI...

    Authors: Keiko Yamamoto, Toshimichi Otsubo, Koji Matsumoto, Hirotomo Noda, Noriyuki Namiki, Hiroshi Takeuchi, Hitoshi Ikeda, Makoto Yoshikawa, Yukio Yamamoto, Hiroki Senshu, Takahide Mizuno, Naru Hirata, Ryuhei Yamada, Yoshiaki Ishihara, Hiroshi Araki, Shinsuke Abe…

    Citation: Earth, Planets and Space 2020 72:85

    Content type: Full paper

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  42. Obvious crustal deformation is observed during a postseismic period as well as a coseismic period associated with a large earthquake. Major mechanisms of transient postseismic deformation are known as aftersli...

    Authors: Fumiaki Tomita, Takeshi Iinuma, Yusaku Ohta, Ryota Hino, Motoyuki Kido and Naoki Uchida

    Citation: Earth, Planets and Space 2020 72:84

    Content type: Full paper

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