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  1. Content type: Express Letter

    Remote sampling of water from Yugama crater lake at Kusatsu-Shirane volcano, Japan, was performed using a drone. Despite the high altitude of over 2000 m above sea level, our simple method was successful in re...

    Authors: Akihiko Terada, Yuichi Morita, Takeshi Hashimoto, Toshiya Mori, Takeshi Ohba, Muga Yaguchi and Wataru Kanda

    Citation: Earth, Planets and Space 2018 70:64

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  2. Content type: Full paper

    Although the 2015 Hakone Volcano eruption was a small-scale phreatic eruption with a discharged mass of only about 100 tons, interferometric synthetic aperture radar successfully detected surface deformations ...

    Authors: Ryosuke Doke, Masatake Harada, Kazutaka Mannen, Kazuhiro Itadera and Jun Takenaka

    Citation: Earth, Planets and Space 2018 70:63

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  3. Content type: Full paper

    The 2016 moment magnitude (Mw) 7.8 Kaikoura earthquake demonstrated that multiple fault segments can undergo rupture during a single seismic event. Here, we employ Global Positioning System (GPS) observations ...

    Authors: Zhongshan Jiang, Dingfa Huang, Linguo Yuan, Abubakr Hassan, Lupeng Zhang and Zhongrong Yang

    Citation: Earth, Planets and Space 2018 70:62

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  4. Content type: Full paper

    When working with ultra-low-frequency (ULF) magnetic datasets, as with most geophysical time-series data, it is important to be able to distinguish between cultural signals, internal instrument noise, and natu...

    Authors: Can Wang, Chen Bin, Lilianna E. Christman, Jonathan M. G. Glen, Simon L. Klemperer, Darcy K. McPhee, Karl N. Kappler, Tom E. Bleier and J. Clark Dunson

    Citation: Earth, Planets and Space 2018 70:57

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  5. Content type: Full paper

    Tectonic and volcanic structures of the northern Ryukyu arc are investigated on the basis of multichannel seismic (MCS) reflection data. The study area forms an active volcanic front in parallel to the non-vol...

    Authors: Ryuta Arai, Shuichi Kodaira, Tsutomu Takahashi, Seiichi Miura and Yoshiyuki Kaneda

    Citation: Earth, Planets and Space 2018 70:61

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  6. Content type: Full paper

    In this paper, we propose an inverse method for full gravity gradient tensor data in the spherical coordinate system. As opposed to the traditional gravity inversion in the Cartesian coordinate system, our pro...

    Authors: Yi Zhang, Yulong Wu, Jianguo Yan, Haoran Wang, J. Alexis P. Rodriguez and Yue Qiu

    Citation: Earth, Planets and Space 2018 70:58

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  7. Content type: Full paper

    Ionospheric irregularities are an important phenomenon in scientific studies and applications of radio-wave propagation. Spread-F echoes in ionograms are a type of high-frequency band irregularities that inclu...

    Authors: Ning Wang, Lixin Guo, Zhenwei Zhao, Zonghua Ding and Leke Lin

    Citation: Earth, Planets and Space 2018 70:59

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  8. Content type: Full paper

    On August 8, 2017, the Jiuzhaigou Mw 6.5 earthquake occurred in Sichuan province, southwestern China, along the eastern margin of the Tibetan Plateau. The epicenter is surrounded by the Minjiang, Huya, and Taz...

    Authors: Zhaosheng Nie, Di-Jin Wang, Zhige Jia, Pengfei Yu and Liangfa Li

    Citation: Earth, Planets and Space 2018 70:55

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  9. Content type: Full paper

    Spatial and temporal variations in inland crustal stress prior to the 2011 Mw 9.0 Tohoku earthquake are investigated using focal mechanism solutions for shallow seismicity in Iwaki City, Japan. The multiple in...

    Authors: Makoto Otsubo, Ayumu Miyakawa and Kazutoshi Imanishi

    Citation: Earth, Planets and Space 2018 70:51

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  10. Content type: Full paper

    The southeast offshore Mie earthquake occurred on April 1, 2016 near the rupture area of the 1944 Tonankai earthquake, where seismicity around the interface of the Philippine Sea plate had been very low until ...

    Authors: Shunsuke Takemura, Takeshi Kimura, Tatsuhiko Saito, Hisahiko Kubo and Katsuhiko Shiomi

    Citation: Earth, Planets and Space 2018 70:50

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  11. Content type: Express Letter

    Magnetotelluric data analyses and three-dimensional modeling techniques were implemented to investigate the crustal electrical structure in the North-Central Turkey, along a 190-km-long profile crossing Çankır...

    Authors: Sinan Özaydın, Sabri Bülent Tank and Mustafa Karaş

    Citation: Earth, Planets and Space 2018 70:49

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  12. Content type: Express Letter

    The vertical downward component of the DC atmospheric electric field, or potential gradient (PG), at Kakioka 150 km southwest of the Fukushima Dai-ichi Nuclear Power Plant (FNPP1) was analyzed before and after...

    Authors: Masatoshi Yamauchi, Masahiko Takeda and Shingo Nagamachi

    Citation: Earth, Planets and Space 2018 70:48

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  13. Content type: Frontier letter

    A hot and acid crater lake is located in the Nakadake crater, Aso volcano, Japan. The volume of water in the lake decreases with increasing activity, drying out prior to the magmatic eruptions. Salt-rich mater...

    Authors: Hiroshi Shinohara, Nobuo Geshi, Akihiko Yokoo, Takahiro Ohkura and Akihiko Terada

    Citation: Earth, Planets and Space 2018 70:46

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  14. Content type: Full paper

    Geomagnetic excursions during Brunhes epoch have been brought to the forefront topic in paleomagnetic study, as they provide key information about Earth’s interior dynamics and could serve as another tool for ...

    Authors: Guanhua Li, Dunsheng Xia, Erwin Appel, Youjun Wang, Jia Jia and Xiaoqiang Yang

    Citation: Earth, Planets and Space 2018 70:44

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  15. Content type: Full paper

    We studied ionospheric irregularities caused by midlatitude sporadic-E (Es) in Japan using ionospheric total electron content (TEC) data from a dense GNSS array, GEONET, with a 3D (three-dimensional) tomography t...

    Authors: Ihsan Naufal Muafiry, Kosuke Heki and Jun Maeda

    Citation: Earth, Planets and Space 2018 70:45

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  16. Content type: Full paper

    The fluxgate magnetometer for the Arase (ERG) spacecraft mission was built to investigate particle acceleration processes in the inner magnetosphere. Precise measurements of the field intensity and direction a...

    Authors: Ayako Matsuoka, Mariko Teramoto, Reiko Nomura, Masahito Nosé, Akiko Fujimoto, Yoshimasa Tanaka, Manabu Shinohara, Tsutomu Nagatsuma, Kazuo Shiokawa, Yuki Obana, Yoshizumi Miyoshi, Makoto Mita, Takeshi Takashima and Iku Shinohara

    Citation: Earth, Planets and Space 2018 70:43

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  17. Content type: Full paper

    Combining analyses of spatial and temporal characteristics of the ionosphere is of great significance for scientific research and engineering applications. Tensor decomposition is performed to explore the temp...

    Authors: Shikun Lu, Hao Zhang, Xihai Li, Yihong Li, Chao Niu, Xiaoyun Yang and Daizhi Liu

    Citation: Earth, Planets and Space 2018 70:39

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  18. Content type: Full paper

    The Gravity Recovery and Climate Experiment (GRACE) satellite mission measures the combined gravity signal of several overlapping processes. A common approach to separate the hydrological signal in previous ic...

    Authors: Tanghua Li, Patrick Wu, Hansheng Wang, Lulu Jia and Holger Steffen

    Citation: Earth, Planets and Space 2018 70:41

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  19. Content type: Full paper

    Belonging to the Cameroon Volcanic Line (CVL), the western part of Cameroon is an active volcanic zone with volcanic eruptions and deadly gas emissions. The volcanic flows generally cover areas and bury struct...

    Authors: Jean Marcel, Jean Marcel Abate Essi, Philippe Njandjock Nouck, Oumarou Sanda and Eliézer Manguelle-Dicoum

    Citation: Earth, Planets and Space 2018 70:42

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