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  1. Technical report

    OCTAD-S: digital fast Fourier transform spectrometers by FPGA

    We have developed a digital fast Fourier transform spectrometer made of an analog-to-digital converter (ADC) and a field-programmable gate array (FPGA). The base instrument has independent ADC and FPGA modules...

    Kazumasa Iwai, Yûki Kubo, Hiromitsu Ishibashi, Takahiro Naoi, Kenichi Harada, Kenji Ema, Yoshinori Hayashi and Yuichi Chikahiro

    Earth, Planets and Space 2017 69:95

    Published on: 11 July 2017

  2. Full paper

    Variation of Antarctic circumpolar current and its intensification in relation to the southern annular mode detected in the time-variable gravity signals by GRACE satellite

    The southern annular mode (SAM) in the atmosphere and the Antarctic circumpolar current (ACC) in the ocean play decisive roles in the climatic system of the mid- to high-latitude southern hemisphere. Using the...

    Jen-Ru Liau and Benjamin F. Chao

    Earth, Planets and Space 2017 69:93

    Published on: 6 July 2017

  3. Full paper

    Evaluation of a method to derive ionospheric conductivities using two auroral emissions (428 and 630 nm) measured with a photometer at Tromsø (69.6°N)

    This paper mainly aims at evaluating capabilities of derivation of ionospheric conductivities using two principal auroral emissions (427.8 and 630 nm). We have evaluated a photometric method of derivation of i...

    Kazuhiro Adachi, Satonori Nozawa, Yasunobu Ogawa, Asgeir Brekke, Chris Hall and Ryoichi Fujii

    Earth, Planets and Space 2017 69:90

    Published on: 3 July 2017

  4. Full paper

    Variations in seismic velocity distribution along the Ryukyu (Nansei-Shoto) Trench subduction zone at the northwestern end of the Philippine Sea plate

    The Ryukyu (Nansei-Shoto) island arc-trench system, southwest of Japan, is formed by the subduction of the Philippine Sea (PHS) plate. Among the subduction zones surrounding the Japan Islands, the Ryukyu arc-t...

    Azusa Nishizawa, Kentaro Kaneda, Mitsuhiro Oikawa, Daishi Horiuchi, Yukari Fujioka and Chiaki Okada

    Earth, Planets and Space 2017 69:86

    Published on: 29 June 2017

  5. Express Letter

    San-in shear zone in southwest Japan, revealed by GNSS observations

    A right-lateral shear zone in the San-in region, southwest Japan, has been proposed by previous geological and seismological studies. It locates 350 km north of the Nankai Trough, that is, the main plate bound...

    Takuya Nishimura and Youichiro Takada

    Earth, Planets and Space 2017 69:85

    Published on: 27 June 2017

  6. Letter

    Ground uplift related to permeability enhancement following the 2011 Tohoku earthquake in the Kanto Plain, Japan

    We investigated the post-seismic surface displacement of the 2011 Tohoku earthquake around the Kanto Plain (including the capital area of Japan), which is located approximately 400 km from the epicenter, using...

    Kazuya Ishitsuka, Toshifumi Matsuoka, Takuya Nishimura, Takeshi Tsuji and Tamer ElGharbawi

    Earth, Planets and Space 2017 69:81

    Published on: 19 June 2017

  7. Frontier letter

    Design and operation of a 1500-m laser strainmeter installed at an underground site in Kamioka, Japan

    A laser strainmeter with a 1500-m baseline was constructed at an underground site in Kamioka, Gifu Prefecture, Japan, and has been operating since August 2016. The laser interferometer measures the change in d...

    Akito Araya, Akiteru Takamori, Wataru Morii, Kouseki Miyo, Masatake Ohashi, Kazuhiro Hayama, Takashi Uchiyama, Shinji Miyoki and Yoshio Saito

    Earth, Planets and Space 2017 69:77

    Published on: 8 June 2017

  8. Full paper

    Volcanic deformation of Atosanupuri volcanic complex in the Kussharo caldera, Japan, from 1993 to 2016 revealed by JERS-1, ALOS, and ALOS-2 radar interferometry

    A series of uplifts and subsidences of a volcanic complex in the Kussharo caldera in eastern Hokkaido (Japan) has been revealed by interferometric analysis using archived satellite synthetic aperture radar dat...

    Satoshi Fujiwara, Makoto Murakami, Takuya Nishimura, Mikio Tobita, Hiroshi Yarai and Tomokazu Kobayashi

    Earth, Planets and Space 2017 69:78

    Published on: 8 June 2017

  9. Express Letter

    Spatial variation in coda Q in the northeastern part of Niigata–Kobe Tectonic Zone, central Japan: implication of the cause of a high strain rate zone

    We have analyzed the spatial variation in coda Q in the northeastern part of a high strain rate zone, the Niigata–Kobe Tectonic Zone (NKTZ), to investigate the cause of the high strain rate by correlating coda Q ...

    Masanobu Dojo and Yoshihiro Hiramatsu

    Earth, Planets and Space 2017 69:76

    Published on: 5 June 2017

  10. Technical report

    Space environment data acquisition monitor onboard Himawari-8 for space environment monitoring on the Japanese meridian of geostationary orbit

    A space environment data acquisition monitor (SEDA) has been flown onboard the Japanese meteorological satellites ‘Himawari-8/9’ as one of the housekeeping information monitors for satellite operation. SEDA co...

    Tsutomu Nagatsuma, Kaori Sakaguchi, Yûki Kubo, Piet Belgraver, Frédéric Chastellain, Reto Muff and Takeshi Otomo

    Earth, Planets and Space 2017 69:75

    Published on: 30 May 2017

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