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  1. Full paper

    Electrical conductivity of a locked fault: investigation of the Ganos segment of the North Anatolian Fault using three-dimensional magnetotellurics

    This study attempts to reveal the fault zone characteristics of the locked Ganos Fault based on electrical resistivity studies including audio-frequency (AMT: 10,400–1 Hz) and wide-band (MT: 360–0.000538 Hz) m...

    Mustafa Karaş, Sabri Bülent Tank and Sinan Özaydın

    Earth, Planets and Space 2017 69:107

    Published on: 15 August 2017

  2. Frontier Letter

    Volcanic activity on Io and its influence on the dynamics of the Jovian magnetosphere observed by EXCEED/Hisaki in 2015

    Jupiter’s moon Io, which orbits deep inside the magnetosphere, is the most geologically active object in the solar system. Kurdalagon Patera, a volcano on Io, erupted in 2015 and became a substantial source of...

    Ichiro Yoshikawa, Fumiharu Suzuki, Reina Hikida, Kazuo Yoshioka, Go Murakami, Fuminori Tsuchiya, Chihiro Tao, Atsushi Yamazaki, Tomoki Kimura, Hajime Kita, Hiromasa Nozawa and Masaki Fujimoto

    Earth, Planets and Space 2017 69:110

    Published on: 15 August 2017

  3. Full paper

    Electrical conductivity of old oceanic mantle in the northwestern Pacific I: 1-D profiles suggesting differences in thermal structure not predictable from a plate cooling model

    Seafloor magnetotelluric (MT) experiments were recently conducted in two areas of the northwestern Pacific to investigate the nature of the old oceanic upper mantle. The areas are far from any tectonic activit...

    Kiyoshi Baba, Noriko Tada, Tetsuo Matsuno, Pengfei Liang, Ruibai Li, Luolei Zhang, Hisayoshi Shimizu, Natsue Abe, Naoto Hirano, Masahiro Ichiki and Hisashi Utada

    Earth, Planets and Space 2017 69:111

    Published on: 15 August 2017

  4. Full paper

    Surface wave group velocity in the Osaka sedimentary basin, Japan, estimated using ambient noise cross-correlation functions

    Inter-station cross-correlation functions estimated using continuous ambient noise or microtremor records were used to extract the seismic wave propagation characteristics of the Osaka sedimentary basin, Japan...

    Kimiyuki Asano, Tomotaka Iwata, Haruko Sekiguchi, Kazuhiro Somei, Ken Miyakoshi, Shin Aoi and Takashi Kunugi

    Earth, Planets and Space 2017 69:108

    Published on: 15 August 2017

  5. Letter

    Morphologies of omega band auroras

    We examined the morphological signatures of 315 omega band aurora events observed using the Time History of Events and Macroscale Interactions during Substorm ground-based all-sky imager network over a period ...

    Natsuo Sato, Akira Sessai Yukimatu, Yoshimasa Tanaka and Tomoaki Hori

    Earth, Planets and Space 2017 69:103

    Published on: 3 August 2017

  6. Full paper

    Estimation of 1-D velocity models beneath strong-motion observation sites in the Kathmandu Valley using strong-motion records from moderate-sized earthquakes

    The Himalayan collision zone experiences many seismic activities with large earthquakes occurring at certain time intervals. The damming of the proto-Bagmati River as a result of rapid mountain-building proces...

    Subeg M. Bijukchhen, Nobuo Takai, Michiko Shigefuji, Masayoshi Ichiyanagi, Tsutomu Sasatani and Yokito Sugimura

    Earth, Planets and Space 2017 69:97

    Published on: 24 July 2017

  7. Full paper

    Deriving amplification factors from simple site parameters using generalized regression neural networks: implications for relevant site proxies

    Most modern seismic codes account for site effects using an amplification factor (AF) that modifies the rock acceleration response spectra in relation to a “site condition proxy,” i.e., a parameter related to ...

    Ahmed Boudghene Stambouli, Djawad Zendagui, Pierre-Yves Bard and Boumédiène Derras

    Earth, Planets and Space 2017 69:99

    Published on: 24 July 2017

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

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