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  1. 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
    Content type: Express Letter Published on:

  2. 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
    Content type: Express Letter Published on:

  4. 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
    Content type: Frontier letter Published on:

  5. 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
    Content type: Full paper Published on:

  6. 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
    Content type: Full paper Published on:

  7. 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
    Content type: Full paper Published on:

  8. 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
    Content type: Full paper Published on:

  9. 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
    Content type: Full paper Published on:

  10. 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
    Content type: Full paper Published on:

  12. We measured the abundances of Sr and rare earth elements (REEs) in the matrices of five CV3 carbonaceous chondrites: Meteorite Hills (MET) 00430, MET 01070, La Paz ice field (LAP) 02206, Asuka (A) 881317 and R...

    Authors: Kaori Jogo, Motoo Ito, Tomoki Nakamura, Sachio Kobayashi and Jong Ik Lee
    Citation: Earth, Planets and Space 2018 70:37
    Content type: Express Letter Published on:

  13. We report a brief survey on conditions for artificial aurora optical experiments in F region heating with O-mode at the EISCAT Tromsø site using dynasonde data from 2000 to 2017. The results obtained in our surve...

    Authors: T. T. Tsuda, M. T. Rietveld, M. J. Kosch, S. Oyama, K. Hosokawa, S. Nozawa, T. Kawabata, A. Mizuno and Y. Ogawa
    Citation: Earth, Planets and Space 2018 70:40
    Content type: Technical report Published on:

  14. Understanding variations of slip distance along major thrust systems at convergent margins is an important issue for evaluation of near-trench slip and the potential generation of large tsunamis. We derived qu...

    Authors: Hideki Mukoyoshi, Shunya Kaneki and Tetsuro Hirono
    Citation: Earth, Planets and Space 2018 70:36
    Content type: Full paper Published on:

  15. Geomagnetic field data obtained through the INTERMAGNET program are convolved with with magnetotelluric surface impedance from four EarthScope USArray sites to estimate the geoelectric variations throughout th...

    Authors: Stephen W. Cuttler, Jeffrey J. Love and Andrei Swidinsky
    Citation: Earth, Planets and Space 2018 70:35
    Content type: Express Letter Published on:

  16. The basic theory for reconstruction of two-dimensional, coherent, magnetohydrostatic structures with nonisotropic plasma pressure is developed. Three field-line invariants are found in the system. A new Poisso...

    Authors: Wai-Leong Teh
    Citation: Earth, Planets and Space 2018 70:34
    Content type: Express Letter Published on:

    The Correction to this article has been published in Earth, Planets and Space 2018 70:185

  18. The Atotsugawa fault system is one of the best-known active faults in Japan. However, revealing the interseismic velocity field in and around the Atotsugawa fault system with high spatial resolution is challen...

    Authors: Youichiro Takada, Takeshi Sagiya and Takuya Nishimura
    Citation: Earth, Planets and Space 2018 70:32
    Content type: Full paper Published on:

  19. Seismic attenuation properties were tested as indicators of lateral variation in geological structures and detection of faults within poorly reflective oceanic crust, on a seismic survey line along the Nankai ...

    Authors: Tetsuro Tsuru, Jin-Oh Park, Tetsuo No, Yukari Kido and Kazuo Nakahigashi
    Citation: Earth, Planets and Space 2018 70:31
    Content type: Full paper Published on:

  20. CHAMP satellite and relatively densely spaced ground-based data measured over southern Africa between 2005 and 2010 are combined in a new regional, harmonic spline based, core field model. This new SACFM-2 mod...

    Authors: Emmanuel Nahayo, Pieter B. Kotzé, Monika Korte and Susan J. Webb
    Citation: Earth, Planets and Space 2018 70:30
    Content type: Full paper Published on:

  21. The effects of solar flares on the propagation of subionospheric VLF signals from NWC and NLK transmitter stations monitored at a low-latitude station, Suva (18.2°S, 178.4°E), Fiji, between December 2006 and D...

    Authors: Abhikesh Kumar and Sushil Kumar
    Citation: Earth, Planets and Space 2018 70:29
    Content type: Full paper Published on:

  22. GNSS atmospheric water vapor monitoring is not yet routinely performed in Italy, particularly at the regional scale. However, in order to support the activities of regional environmental protection agencies, t...

    Authors: Stefano Barindelli, Eugenio Realini, Giovanna Venuti, Alessandro Fermi and Andrea Gatti
    Citation: Earth, Planets and Space 2018 70:28
    Content type: Full paper Published on:

  23. We present a new tool for modelling time-lapse magnetotelluric (MT) data, an emerging technique for monitoring changes in subsurface electrical resistivity. Time-lapse MT data have been acquired in various set...

    Authors: Dennis Conway, Graham Heinson, Nigel Rees and Joseph Rugari
    Citation: Earth, Planets and Space 2018 70:27
    Content type: Full paper Published on:

  24. Rigid transformation including rotation and translation can be elegantly represented by a unit dual quaternion. Thus, a non-differential model of the Helmert transformation (3D seven-parameter similarity trans...

    Authors: Huaien Zeng, Xing Fang, Guobin Chang and Ronghua Yang
    Citation: Earth, Planets and Space 2018 70:26
    Content type: Full paper Published on:

  25. The water in Earth’s mantle is closely related with plate subduction and volcanism. Recent studies revealed that the mantle wedge corner at approximately 30 km depth holds high-pressure water, where many slow ...

    Authors: Yoshiyuki Tanaka, Takehito Suzuki, Yuichi Imanishi, Shuhei Okubo, Xinlin Zhang, Miwako Ando, Atsushi Watanabe, Mamoru Saka, Chiaki Kato, Shuichi Oomori and Yoshifumi Hiraoka
    Citation: Earth, Planets and Space 2018 70:25
    Content type: Express Letter Published on:

  26. Since insertion into orbit on December 7, 2015, the Akatsuki orbiter has returned global images of Venus from its four imaging cameras at eleven discrete wavelengths from ultraviolet (283 and 365 nm) and near ...

    Authors: Sanjay S. Limaye, Shigeto Watanabe, Atsushi Yamazaki, Manabu Yamada, Takehiko Satoh, Takao M. Sato, Masato Nakamura, Makoto Taguchi, Tetsuya Fukuhara, Takeshi Imamura, Toru Kouyama, Yeon Joo Lee, Takeshi Horinouchi, Javier Peralta, Naomoto Iwagami, George L. Hashimoto…
    Citation: Earth, Planets and Space 2018 70:24
    Content type: Full paper Published on:

  27. The ultraviolet imager (UVI) has been developed for the Akatsuki spacecraft (Venus Climate Orbiter mission). The UVI takes ultraviolet (UV) images of the solar radiation reflected by the Venusian clouds with nar...

    Authors: Atsushi Yamazaki, Manabu Yamada, Yeon Joo Lee, Shigeto Watanabe, Takeshi Horinouchi, Shin-ya Murakami, Toru Kouyama, Kazunori Ogohara, Takeshi Imamura, Takao M. Sato, Yukio Yamamoto, Tetsuya Fukuhara, Hiroki Ando, Ko-ichiro Sugiyama, Seiko Takagi, Hiroki Kashimura…
    Citation: Earth, Planets and Space 2018 70:23
    Content type: Full paper Published on:

  28. The radio acoustic sounding system (RASS) with the equatorial atmosphere radar (EAR) at Koto Tabang, Indonesia was adapted to test the effects of the acoustic source location and acoustic frequency range on th...

    Authors: Ina Juaeni, Hiraku Tabata, Noersomadi, Halimurrahman, Hiroyuki Hashiguchi and Toshitaka Tsuda
    Citation: Earth, Planets and Space 2018 70:22
    Content type: Full paper Published on:

  29. We examined the spatial relationship between seismicity and upper crustal structure in the Wakayama region, northwestern Kii Peninsula, Japan, by investigating microearthquake focal mechanisms and the local st...

    Authors: Sumire Maeda, Toru Matsuzawa, Shinji Toda, Keisuke Yoshida and Hiroshi Katao
    Citation: Earth, Planets and Space 2018 70:21
    Content type: Full paper Published on:

  30. After publication of this work [1], an error was noticed. Figures 10 and 12 were accidentally swapped. This was caused due to a typesetting error. This is now corrected below: The publisher apologises for thes...

    Authors: Yoshihisa Iio, Itaru Yoneda, Masayo Sawada, Tsutomu Miura, Hiroshi Katao, Yoichiro Takada, Kentaro Omura and Shigeki Horiuchi
    Citation: Earth, Planets and Space 2018 70:20
    Content type: Correction Published on:

    The original article was published in Earth, Planets and Space 2017 69:144

  34. Understanding of underlying mechanisms of drastic variations of the near-Earth space (geospace) is one of the current focuses of the magnetospheric physics. The science target of the geospace research project ...

    Authors: Kanako Seki, Yoshizumi Miyoshi, Yusuke Ebihara, Yuto Katoh, Takanobu Amano, Shinji Saito, Masafumi Shoji, Aoi Nakamizo, Kunihiro Keika, Tomoaki Hori, Shin’ya Nakano, Shigeto Watanabe, Kei Kamiya, Naoko Takahashi, Yoshiharu Omura, Masahito Nose…
    Citation: Earth, Planets and Space 2018 70:17
    Content type: Full paper Published on:

  35. A continuous water injection test was conducted to halt the reduction in steam production in the Okuaizu Geothermal Field, Japan. Understanding the factors triggering microseismicity associated with water inje...

    Authors: Kyosuke Okamoto, Li Yi, Hiroshi Asanuma, Takashi Okabe, Yasuyuki Abe and Masatoshi Tsuzuki
    Citation: Earth, Planets and Space 2018 70:15
    Content type: Express Letter Published on:

  36. Tenerife has been the subject of numerous studies covering a wide range of fields. Many studies have been focused on characterising the magmatic plumbing system. Even so, a controversy still exists regarding t...

    Authors: Perla Piña-Varas, Juanjo Ledo, Pilar Queralt, Alex Marcuello and Nemesio Perez
    Citation: Earth, Planets and Space 2018 70:14
    Content type: Express Letter Published on:

  40. Venus is covered with thick clouds. Ultraviolet (UV) images at 0.3–0.4 microns show detailed cloud features at the cloud-top level at about 70 km, which are created by an unknown UV-absorbing substance. Images...

    Authors: Takeshi Horinouchi, Toru Kouyama, Yeon Joo Lee, Shin-ya Murakami, Kazunori Ogohara, Masahiro Takagi, Takeshi Imamura, Kensuke Nakajima, Javier Peralta, Atsushi Yamazaki, Manabu Yamada and Shigeto Watanabe
    Citation: Earth, Planets and Space 2018 70:10
    Content type: Full paper Published on:

  41. In the gravity sensor of a superconducting gravimeter, a superconducting sphere as a test mass is levitated in a magnetic field. Such a sensor is susceptible to applied horizontal as well as vertical accelerat...

    Authors: Yuichi Imanishi, Kazunari Nawa, Yoshiaki Tamura and Hiroshi Ikeda
    Citation: Earth, Planets and Space 2018 70:9
    Content type: Full paper Published on:

  43. The telluric sounding (TS) method is introduced as a potential tool for monitoring hydraulic fracturing at depth. The advantage of this technique is that it requires only the measurement of electric fields, wh...

    Authors: Nigel Rees, Graham Heinson and Dennis Conway
    Citation: Earth, Planets and Space 2018 70:7
    Content type: Full paper Published on:

  44. The status and initial products of the 1-μm camera onboard the Akatsuki mission to Venus are presented. After the successful retrial of Venus’ orbit insertion on Dec. 2015 (5 years after the failure in Dec. 20...

    Authors: Naomoto Iwagami, Takeshi Sakanoi, George L. Hashimoto, Kenta Sawai, Shoko Ohtsuki, Seiko Takagi, Kazunori Uemizu, Munetaka Ueno, Shingo Kameda, Shin-ya Murakami, Masato Nakamura, Nobuaki Ishii, Takumi Abe, Takehiko Satoh, Takeshi Imamura, Chikako Hirose…
    Citation: Earth, Planets and Space 2018 70:6
    Content type: Full paper Published on:

  45. The solar quiet (Sq) source morphology changes on a daily basis and becomes disturbed during periods of increased magnetic activity. Therefore, it may be preferable to use single-day magnetic field recordings ...

    Authors: Martina Guzavina, Alexander Grayver and Alexey Kuvshinov
    Citation: Earth, Planets and Space 2018 70:5
    Content type: Full paper Published on:

  46. We describe the principles of the Wave–Particle Interaction Analyzer (WPIA) and the implementation of the Software-type WPIA (S-WPIA) on the Arase satellite. The WPIA is a new type of instrument for the direct...

    Authors: Yuto Katoh, Hirotsugu Kojima, Mitsuru Hikishima, Takeshi Takashima, Kazushi Asamura, Yoshizumi Miyoshi, Yoshiya Kasahara, Satoshi Kasahara, Takefumi Mitani, Nana Higashio, Ayako Matsuoka, Mitsunori Ozaki, Satoshi Yagitani, Shoichiro Yokota, Shoya Matsuda, Masahiro Kitahara…
    Citation: Earth, Planets and Space 2018 70:4
    Content type: Full paper Published on:

  47. We performed two axial deformation experiments on synthetic polycrystalline anorthite samples with a grain size of ~ 3 μm and 5 vol% Si–Al-rich glass at 900 °C, a confining pressure of 1.0 GPa, and a strain ra...

    Authors: Jun-ichi Fukuda, Jun Muto and Hiroyuki Nagahama
    Citation: Earth, Planets and Space 2018 70:3
    Content type: Full paper Published on:

  48. We present a meteor observation system based on imaging CCD cameras, wide-field optics and a diffraction grating. This system is composed of two independent spectrographs with different configurations, which a...

    Authors: Francisco Ángel Espartero, Germán Martínez, Marta Frías, Francisco Simón Montes Moya and Alberto Javier Castro-Tirado
    Citation: Earth, Planets and Space 2018 70:2
    Content type: Express Letter Published on:

  49. We have been discussing the validity of using the horizontal-to-vertical spectral ratios (HVRs) as a substitute for S-wave amplifications after Nakamura first proposed the idea in 1989. So far a formula for HV...

    Authors: Hiroshi Kawase, Yuta Mori and Fumiaki Nagashima
    Citation: Earth, Planets and Space 2018 70:1
    Content type: Full paper Published on:

  50. Sporadic-E (Es) is a layer of ionization that irregularly appears within the E region of the ionosphere and is known to generate an unusual propagation of very high frequency waves over long distances. The det...

    Authors: Masato Furuya, Takato Suzuki, Jun Maeda and Kosuke Heki
    Citation: Earth, Planets and Space 2017 69:175
    Content type: Full paper Published on:
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