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  1. Content type: Technical report

    The Hayabusa2 mission aims to obtain pristine samples from a near-Earth carbonaceous-type (C-type) asteroid, 162173 Ryugu, and return them to Earth. One of the scientific goals of the mission is to understand ...

    Authors: Haruna Sugahara, Yoshinori Takano, Yuzuru Karouji, Kazuya Kumagai, Toru Yada, Naohiko Ohkouchi and Masanao Abe

    Citation: Earth, Planets and Space 2018 70:194

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  2. Content type: Full paper

    In 2014, a phreatic eruption occurred at the Ontake Volcano in Central Japan causing multiple deaths and missing persons. Interferometric Synthetic Aperture Radar data showed local-scale subsidence around the ...

    Authors: Shohei Narita and Makoto Murakami

    Citation: Earth, Planets and Space 2018 70:191

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  3. Content type: Technical report

    A new five-wavelength photometer was developed and installed at the EISCAT Tromsø site (69.6°N, 19.2°E) in January 2017. The photometer consists of two units: an optical unit and a control unit together with a...

    Authors: Satonori Nozawa, Tetsuya Kawabata, Keisuke Hosokawa, Yasunobu Ogawa, Takuo Tsuda, Akira Mizuno, Ryoichi Fujii and Chris Hall

    Citation: Earth, Planets and Space 2018 70:193

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  4. Content type: Full paper

    In order to investigate the role of dikes in the volcanic evolution and the triggering mechanisms of catastrophic mass wasting volcanoes, we have sampled for a pilot study, seven dikes within the Wai’anae volc...

    Authors: Emilio Herrero-Bervera, Bernard Henry and Mário Moreira

    Citation: Earth, Planets and Space 2018 70:190

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  5. Content type: Full paper

    We analyzed strong-motion and broadband recordings of two moderate-magnitude earthquakes that occurred in the Nankai Trough. The first event was the 2004 Mw 6.5 southeast off-Kii peninsula earthquake, an after...

    Authors: Yadab P. Dhakal, Wataru Suzuki, Takeshi Kimura, Nobuyuki Morikawa, Takashi Kunugi and Shin Aoi

    Citation: Earth, Planets and Space 2018 70:189

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  6. Content type: Full paper

    The Kairei (KHF) and Yokoniwa hydrothermal fields (YHF) are hosted in mafic as well as ultramafic rocks distributed at an off-axis volcanic knoll of the Central Indian Ridge. Despite intensive investigations, ...

    Authors: Masakazu Fujii and Kyoko Okino

    Citation: Earth, Planets and Space 2018 70:188

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  7. Content type: Correction

    After publication of this article (Kaneko et al. 2018), it is noticed there is an error in Fig. 3b; the lower 2.3-µm band image is mistakenly removed. The correct Fig. 3 is given below.

    Authors: Takayuki Kaneko, Atsushi Yasuda, Yoshito Yoshizaki, Kenji Takasaki and Yoshiaki Honda

    Citation: Earth, Planets and Space 2018 70:187

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    The original article was published in Earth, Planets and Space 2018 70:175

  8. Content type: Technical report

    Chemical demagnetization is not preferred as a demagnetizing method in paleomagnetism because strong acids are cumbersome to handle and require considerable time compared to alternating field and thermal demag...

    Authors: Chisato Anai, Nobutatsu Mochizuki and Hidetoshi Shibuya

    Citation: Earth, Planets and Space 2018 70:184

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  9. Content type: Full paper

    Our investigations are based on the property that the fields of sources, whose depths are numerically equal to survey heights, are most brightly presented in the data of magnetic survey. Therefore, the magneti...

    Authors: Yury P. Tsvetkov, Konstantin V. Novikov, Andrey A. Ivanov and Oleg M. Brekhov

    Citation: Earth, Planets and Space 2018 70:183

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  10. Content type: Express Letter

    Seismic swarm areas below the southeast flank of Ontake volcano, central Japan, provide an important opportunity to study interactions between seismicity, volcanic processes and crustal fluid. On June 25, 2017...

    Authors: Hiroshi Ichihara, Junna Kanehiro, Toru Mogi, Koshun Yamaoka, Noriko Tada, Edward Alan Bertrand and Mamoru Adachi

    Citation: Earth, Planets and Space 2018 70:182

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  11. Content type: Express Letter

    We successfully monitored the ground deformation of an eruption center during the 2015 phreatic eruption of Hakone volcano, Japan, using ground-based interferometric synthetic aperture radar (GB-InSAR). GB-InS...

    Authors: Senro Kuraoka, Yuichi Nakashima, Ryosuke Doke and Kazutaka Mannen

    Citation: Earth, Planets and Space 2018 70:181

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  12. Content type: Full paper

    This work describes several important improvements made to the International Reference Ionosphere UPdate (IRI UP) method, and a careful validation of its performances under disturbed conditions. The IRI UP met...

    Authors: Alessio Pignalberi, Marco Pietrella, Michael Pezzopane and Rolando Rizzi

    Citation: Earth, Planets and Space 2018 70:180

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  13. Content type: Frontier letter

    Investigations of superchrons are the key to understanding long-term changes of the geodynamo and the mantle’s controlling role. Granitic rocks could be good recorders of deep-time geomagnetic field behavior, ...

    Authors: Chie Kato, Masahiko Sato, Yuhji Yamamoto, Hideo Tsunakawa and Joseph L. Kirschvink

    Citation: Earth, Planets and Space 2018 70:176

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  14. Content type: Full paper

    The April 27, 2016 eruption sequence at White Island was comprised of 6 discrete eruptive events that occurred over a 35-min period. Seismicity included three episodes of VLP activity: the first occurring ~ 2 ...

    Authors: Arthur Jolly, Ivan Lokmer, Bruce Christenson and Johannes Thun

    Citation: Earth, Planets and Space 2018 70:177

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  15. Content type: Express Letter

    Volcanic eruptions bring high-temperature gas or magma to the surface. Therefore, thermal observations of volcanic eruptions can be used to investigate the timeline of eruptive sequences. Eruptive activity inc...

    Authors: Takayuki Kaneko, Atsushi Yasuda, Yoshito Yoshizaki, Kenji Takasaki and Yoshiaki Honda

    Citation: Earth, Planets and Space 2018 70:175

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    The Correction to this article has been published in Earth, Planets and Space 2018 70:187

  16. Content type: Express Letter

    It has been known that the Alfvén velocity plays a significant role in generation and propagation of magnetohydrodynamic (MHD) waves. Until now, however, the global distribution of the Alfvén velocity in the m...

    Authors: Khan-Hyuk Kim, Gi-Jeong Kim and Hyuck-Jin Kwon

    Citation: Earth, Planets and Space 2018 70:174

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  17. Content type: Full paper

    Imaging the shallow velocity structures beneath Aso caldera is necessary to further understand volcanism at the volcano and in the region. The network for monitoring Aso volcano has been progressively renewed ...

    Authors: Yu-Chih Huang, Takahiro Ohkura, Tsuneomi Kagiyama, Shin Yoshikawa and Hiroyuki Inoue

    Citation: Earth, Planets and Space 2018 70:169

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  18. Content type: Full paper

    This study investigates phreatic eruptions at two similar volcanoes, Kawah Ijen (Indonesia) and White Island (New Zealand). By carefully processing broadband seismic signals, we reveal seismic signatures and c...

    Authors: Corentin Caudron, Benoit Taisne, Jurgen Neuberg, Arthur D. Jolly, Bruce Christenson, Thomas Lecocq, Suparjan, Devy Syahbana and Gede Suantika

    Citation: Earth, Planets and Space 2018 70:168

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  19. Content type: Technical report

    One of the representative auroral emission lines that radiates from F-region heights and is measurable on the ground is the 777.4 nm line from excited atomic oxygen. This line has been adopted, along with anot...

    Authors: Shin-ichiro Oyama, Takuo T. Tsuda, Keisuke Hosokawa, Yasunobu Ogawa, Yoshizumi Miyoshi, Satoshi Kurita, Antti E. Kero, Ryoichi Fujii, Yoshimasa Tanaka, Akira Mizuno, Tetsuya Kawabata, Björn Gustavsson and Thomas Leyser

    Citation: Earth, Planets and Space 2018 70:166

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  20. Content type: Express Letter

    Hydrogenetic ferromanganese crusts (hereafter referred to as “crusts”) on Pacific seamounts are formed by the precipitation of iron–manganese oxides from seawater on volcanic and biogenic substrate rocks. As c...

    Authors: Hirokuni Oda, Yoshio Nakasato and Akira Usui

    Citation: Earth, Planets and Space 2018 70:165

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  21. Content type: Frontier letter

    High-latitude, small-scale plasma density irregularities are observed by the Advanced Land Observation Satellite 2, Phase Array type L-band Synthetic Aperture Radar-2 and the European Incoherent Scatter radar ...

    Authors: Hiroatsu Sato, Jun Su Kim, Norbert Jakowski and Ingemar Häggström

    Citation: Earth, Planets and Space 2018 70:163

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  22. Content type: Full paper

    On June 11, 2015, a train of large-amplitude Kelvin–Helmholtz (KH) billows was monitored by the Middle and Upper Atmosphere (MU) radar (Shigaraki MU Observatory, Japan) at the altitude of ~ 6.5 km. Four to fiv...

    Authors: Hubert Luce, Lakshmi Kantha, Masanori Yabuki and Hiroyuki Hashiguchi

    Citation: Earth, Planets and Space 2018 70:162

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  23. Content type: Full paper

    The St. Patrick’s Day geomagnetic storm on March 17, 2015, has been chosen by the space community for synergetic analysis to build a more comprehensive picture of the storm’s origin and evolution. This storm h...

    Authors: Olga V. Kozyreva, Vyacheslav A. Pilipenko, Vladimir B. Belakhovsky and Yaroslav A. Sakharov

    Citation: Earth, Planets and Space 2018 70:157

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  24. Content type: Full paper

    The northeastern Turkey is located at the intensely deformed east Anatolian Collision Zone that is formed by the collision of the Arabian Plate with Eurasia. The region is one of the best examples of the conti...

    Authors: Özlem Hacıoğlu, Ahmet Tuğrul Başokur and Elif Tolak Çiftçi

    Citation: Earth, Planets and Space 2018 70:161

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  25. Content type: Full paper

    Typical eruptions of Taal Volcano in the Philippines are frequent and violently explosive. The last devastating phreatomagmatic eruption from 1965 to 1977 resulted in the death of about 200 persons. For this a...

    Authors: Jacques Zlotnicki, Y. Sasai, M. J. S. Johnston, F. Fauquet, E. Villacorte and J. M. Cordon Jr.

    Citation: Earth, Planets and Space 2018 70:159

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  26. Content type: Full paper

    Previous studies have compiled relative paleointensity data for the last 2–3 Ma from individual paleomagnetic records obtained from marine sediment cores. These records have mostly been obtained by pass-throug...

    Authors: Yuhji Yamamoto, Toshitsugu Yamazaki and Toshiya Kanamatsu

    Citation: Earth, Planets and Space 2018 70:160

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  27. Content type: Full paper

    The effects of the short-wavelength heterogeneity of the crustal structure on predicted ground motion at periods of 1 s and longer were investigated by conducting three-dimensional finite-difference simulation...

    Authors: Asako Iwaki, Takahiro Maeda, Nobuyuki Morikawa, Shunsuke Takemura and Hiroyuki Fujiwara

    Citation: Earth, Planets and Space 2018 70:156

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  28. Content type: Full paper

    Magnetic mineral inclusions in silicates are widespread in sediments as well as in igneous rocks. Because they are isolated from surrounding environment, they have potential to preserve original magnetic signa...

    Authors: Yoichi Usui, Takaya Shimono and Toshitsugu Yamazaki

    Citation: Earth, Planets and Space 2018 70:153

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  29. Content type: Full paper

    Volcanic gas composition measurement by Multi-GAS was repeated during the eruptive period in 2014–2015 as well as the quiet period preceding the eruption at Nakadake crater, Aso volcano. The eruptive activity ...

    Authors: Hiroshi Shinohara, Akihiko Yokoo and Ryunosuke Kazahaya

    Citation: Earth, Planets and Space 2018 70:151

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  30. Content type: Express Letter

    Global navigation satellite system data from Hakone volcano, central Japan, together with GEONET data from the Geospatial Information Authority of Japan, were used to investigate the processes associated with ...

    Authors: Masatake Harada, Ryosuke Doke, Kazutaka Mannen, Kazuhiro Itadera and Mikio Satomura

    Citation: Earth, Planets and Space 2018 70:152

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  31. Content type: Express Letter

    We conducted high-resolution reflection analysis of data from 168 seismic stations with an average spacing of about 5 km, in northern Kinki district, southwestern Japan. Reflection analysis has previously been...

    Authors: Shinya Katoh, Yoshihisa Iio, Hiroshi Katao, Masayo Sawada, Kazuhide Tomisaka, Tsutomu Miura and Itaru Yoneda

    Citation: Earth, Planets and Space 2018 70:149

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  32. Content type: Technical report

    There are growing demands for integrated study of isotopes, trace elements and crystallography of micron-sized grains observed on polished sections or scattered on surface of sample holders. However, transmiss...

    Authors: Yuchen Xu, Lixin Gu, Yang Li, Bing Mo and Yangting Lin

    Citation: Earth, Planets and Space 2018 70:150

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  33. Content type: Full paper

    Analysis of 163 isolated substorms showed that their intensity quantified as a maximum absolute value of the AL index increases with an increase in the velocity and number density of the solar wind plasma and ...

    Authors: Vyacheslav Georgievich Vorobjev, Elizaveta Evgenievna Antonova and Oksana Ivanovna Yagodkina

    Citation: Earth, Planets and Space 2018 70:148

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  34. Content type: Express Letter

    We discovered a secular change in the travel time of direct S-waves over a 10-year observation period by means of continuous operation of an artificial and stable seismic source, called Accurately Controlled R...

    Authors: Shuhei Tsuji, Koshun Yamaoka, Ryoya Ikuta, Takahiro Kunitomo, Toshiki Watanabe, Yasuhiro Yoshida and Akio Katsumata

    Citation: Earth, Planets and Space 2018 70:146

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