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1. Geomagnetism

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  1. Content type: Express Letter

    The Hidaka collision zone, the collision boundary between the NE Japan and Kurile arcs, is known to be an ideal region to study the evolution of island arcs. The hypocenter of the 2018 Hokkaido Eastern Iburi e...

    Authors: Hiroshi Ichihara, Toru Mogi, Hideyuki Satoh and Yusuke Yamaya

    Citation: Earth, Planets and Space 2019 71:100

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  2. Content type: Full paper

    A Curie surface indicates the distribution of the thermal fields underground, providing a clear marker for the thermodynamic effect in the crust and mantle. In this paper, based on a geomagnetic field model (N...

    Authors: Limin Wen, Guofa Kang, Chunhua Bai and Guoming Gao

    Citation: Earth, Planets and Space 2019 71:85

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  3. Content type: Technical report

    The extensive lava piles of Iceland contain a unique record of geomagnetic field variations spanning the past ~ 16 Ma. Since the 1950s, palaeomagnetic data have been obtained from over 9400 Icelandic lavas. We...

    Authors: Justin A. D. Tonti-Filippini and Maxwell C. Brown

    Citation: Earth, Planets and Space 2019 71:83

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  4. Content type: Full paper

    Three lava flows (Buenavista, Xalitzintla and Nealtican) and pyroclastic density currents (Lorenzo and Pink Pumice) from two Popocatepetl Plinian eruptions were sampled for paleomagnetic dating. A detailed roc...

    Authors: Nayeli Pérez-Rodríguez, Juan Morales, Avto Goguitchaichvili and Felipe García-Tenorio

    Citation: Earth, Planets and Space 2019 71:80

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  5. Content type: Full paper

    The interactions of flowing electrically conductive seawater with Earth’s magnetic field generate electric currents within the oceans, as well as secondary electric currents induced in the resistive solid Eart...

    Authors: Libor Šachl, Zdeněk Martinec, Jakub Velímský, Christopher Irrgang, Johannes Petereit, Jan Saynisch, David Einšpigel and Neesha Regmi Schnepf

    Citation: Earth, Planets and Space 2019 71:58

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  6. Content type: Full paper

    We conducted a broadband magnetotelluric (MT) survey along a north–south transect across Unzen graben, Japan. The MT survey line is located ~ 2 km west of the most recent lava dome and consisted of 27 stations...

    Authors: Agnis Triahadini, Koki Aizawa, Yoshiko Teguri, Takao Koyama, Kaori Tsukamoto, Dan Muramatsu, Keita Chiba and Makoto Uyeshima

    Citation: Earth, Planets and Space 2019 71:28

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  7. Content type: Express Letter

    Geomagnetic field variations as recorded at geomagnetic observatories are important for global electromagnetic studies. However, this data set is rarely used for studying the local electrical conductivity at d...

    Authors: Achim Morschhauser, Alexander Grayver, Alexey Kuvshinov, Friedemann Samrock and Jürgen Matzka

    Citation: Earth, Planets and Space 2019 71:17

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  8. Content type: Full paper

    Pure magnetite experiences a first-order phase transition (the Verwey transition) near 120–125 K wherein the mineral’s symmetry changes from cubic to monoclinic. This transformation results in the formation of...

    Authors: Anna K. Lindquist, Joshua M. Feinberg, Richard J. Harrison, James C. Loudon and Andrew J. Newell

    Citation: Earth, Planets and Space 2019 71:5

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  9. Content type: Full paper

    We aim to obtain a modal decomposition of the internal geomagnetic field. In order to do so, we perform a principal component analysis of two virtual observatory datasets, with 4-month sampling time, from the ...

    Authors: João Domingos, Maria Alexandra Pais, Dominique Jault and Mioara Mandea

    Citation: Earth, Planets and Space 2019 71:2

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  10. Content type: Full paper

    Seafloor hydrothermal systems in the back-arc region of the Okinawa Trough have been viewed as a modern analogue to the Kuroko-type volcanogenic massive sulfide deposits. Detection of magnetic signatures is wi...

    Authors: Masakazu Fujii, Hiroshi Sato, Eri Togawa, Kazuhiko Shimada and Jun-ichiro Ishibashi

    Citation: Earth, Planets and Space 2018 70:196

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  11. 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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  12. 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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  13. 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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  14. 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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  15. 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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  16. 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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  17. 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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  18. 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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  19. 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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  20. 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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  21. Content type: Full paper

    The geomagnetic field is comprised of drifting and standing fields. The drifting field has two remarkable features. One is predominance of sectorial harmonics when the field is expressed in a spherical harmoni...

    Authors: Takesi Yukutake and Hisayoshi Shimizu

    Citation: Earth, Planets and Space 2018 70:145

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  22. Content type: Full paper

    Invariants under rotation of the magnetotelluric impedance tensor relax the directional requirements when fitting data using two-dimensional (2D) models. This happens, for instance, when using the familiar imp...

    Authors: Enrique Gómez-Treviño, Yunuhen Muñiz, Mayra Cuellar and Armando Calderón-Moctezuma

    Citation: Earth, Planets and Space 2018 70:133

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  23. Content type: Full paper

    The European Space Agency’s three-satellite constellation Swarm, launched in November 2013, has provided unprecedented monitoring of Earth’s magnetic field via a unique set of gradiometric and multi-satellite mea...

    Authors: Terence J. Sabaka, Lars Tøffner-Clausen, Nils Olsen and Christopher C. Finlay

    Citation: Earth, Planets and Space 2018 70:130

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  24. Content type: Express Letter

    We have developed a new magnetometer system specialized to multipoint and long-term observations on the seafloor to promote marine or ocean-bottom experiments mainly for the electromagnetic sounding of the Ear...

    Authors: Kazunori Ogawa, Tetsuo Matsuno, Hiroshi Ichihara, Kazuo Nakahigashi and Nobukazu Seama

    Citation: Earth, Planets and Space 2018 70:111

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  25. Content type: Full paper

    In this research, a new numerical method, called the hybrid finite difference–finite element (hybrid FD–FE) method, is developed to solve 2-D magnetotelluric modeling by taking advantage of both the finite dif...

    Authors: Weerachai Sarakorn and Chatchai Vachiratienchai

    Citation: Earth, Planets and Space 2018 70:103

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  26. Content type: Full paper

    Many models describing the Earth’s magnetic field exist and are maintained by international research organizations. However, no clear general overview of the cross-compared quality of these models is available...

    Authors: Jean-François Oehler, Didier Rouxel and Marie-Françoise Lequentrec-Lalancette

    Citation: Earth, Planets and Space 2018 70:99

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  27. Content type: Full paper

    Paleomagnetic information reconstructed from archeological materials can be utilized to estimate the archeological age of excavated relics, in addition to revealing the geomagnetic secular variation and core d...

    Authors: Yu Kitahara, Yuhji Yamamoto, Masao Ohno, Yoshihiro Kuwahara, Shuichi Kameda and Tadahiro Hatakeyama

    Citation: Earth, Planets and Space 2018 70:79

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  28. Content type: Full paper

    Paleomagnetic and rock magnetic investigations were performed on a 64-cm-thick section of nonmarine unconsolidated muddy sediment from the Gosan Formation on Jeju Island, Korea. This sediment was recently date...

    Authors: Hyeon-Seon Ahn, Young Kwan Sohn, Jin-Young Lee and Jin Cheul Kim

    Citation: Earth, Planets and Space 2018 70:78

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  29. 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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  30. 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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  31. 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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  32. Content type: Express Letter

    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

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  33. Content type: Full paper

    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

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  34. Content type: Full paper

    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

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  35. Content type: Full paper

    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

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  36. Content type: Full paper

    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

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