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1. Geomagnetism

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  1. We present the geomagnetic field model COV-OBS.x2 that covers the period 1840–2020. It is primarily constrained by observatory series, satellite data, plus older surveys. Over the past two decades, we consider...

    Authors: Loïc Huder, Nicolas Gillet, Christopher C. Finlay, Magnus D. Hammer and Hervé Tchoungui

    Citation: Earth, Planets and Space 2020 72:160

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  2. The IGRF offers an important incentive for testing algorithms predicting the Earth’s magnetic field changes, known as secular variation (SV), in a 5-year range. Here, we present a SV candidate model for the 13...

    Authors: Sabrina Sanchez, Johannes Wicht and Julien Bärenzung

    Citation: Earth, Planets and Space 2020 72:157

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  3. Observations of the geomagnetic field taken at Earth’s surface and at satellite altitude are combined to construct continuous models of the geomagnetic field and its secular variation from 1957 to 2020. From t...

    Authors: I. Wardinski, D. Saturnino, H. Amit, A. Chambodut, B. Langlais, M. Mandea and E. Thébault

    Citation: Earth, Planets and Space 2020 72:155

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  4. We describe a new, original approach to the modelling of the Earth’s magnetic field. The overall objective of this study is to reliably render fast variations of the core field and its secular variation. This ...

    Authors: Guillaume Ropp, Vincent Lesur, Julien Baerenzung and Matthias Holschneider

    Citation: Earth, Planets and Space 2020 72:153

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  5. As posted by the Working Group V of the International Association of Geomagnetism and Aeronomy (IAGA), the 13th generation of the International Geomagnetic Reference Field (IGRF) has been released at the end o...

    Authors: F. Javier Pavón-Carrasco, Santiago Marsal, J. Miquel Torta, Manuel Catalán, Fátima Martín-Hernández and J. Manuel Tordesillas

    Citation: Earth, Planets and Space 2020 72:152

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  6. We present the CHAOS-7 model of the time-dependent near-Earth geomagnetic field between 1999 and 2020 based on magnetic field observations collected by the low-Earth orbit satellites Swarm, CryoSat-2, CHAMP, SAC-...

    Authors: Christopher C. Finlay, Clemens Kloss, Nils Olsen, Magnus D. Hammer, Lars Tøffner-Clausen, Alexander Grayver and Alexey Kuvshinov

    Citation: Earth, Planets and Space 2020 72:156

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  7. Reductive dissolution of magnetite is known to occur below the Fe-redox boundary in sediments. In this study, detailed processes associated with biogenic magnetite dissolution are documented. A sediment core f...

    Authors: Toshitsugu Yamazaki

    Citation: Earth, Planets and Space 2020 72:150

    Content type: Express Letter

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  8. Earth’s internal magnetic field is generated through motion of the electrically conductive iron-alloy fluid comprising its outer core. Temporal variability of this magnetic field, termed secular variation (SV)...

    Authors: Maurits C. Metman, Ciarán D. Beggan, Philip W. Livermore and Jonathan E. Mound

    Citation: Earth, Planets and Space 2020 72:149

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  9. The impedance tensor and tipper are shown to be non-causal in some classes of 2-D and 3-D magnetotelluric (MT) models, including those widely encountered off shore. At the same time, examination of a large dat...

    Authors: Nikita Zorin, Dmitry Alekseev, Dmitrii Epishkin, Hisayoshi Shimizu, Denis Yakovlev and Sergey Zaytsev

    Citation: Earth, Planets and Space 2020 72:139

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  10. We have submitted a secular variation (SV) candidate model for the thirteenth generation of International Geomagnetic Reference Field model (IGRF-13) using a data assimilation scheme and a magnetohydrodynamic ...

    Authors: Takuto Minami, Shin’ya Nakano, Vincent Lesur, Futoshi Takahashi, Masaki Matsushima, Hisayoshi Shimizu, Ryosuke Nakashima, Hinami Taniguchi and Hiroaki Toh

    Citation: Earth, Planets and Space 2020 72:136

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  11. Red clay widely occupies the seafloor of pelagic environments in middle latitudes, and potentially preserves long paleoceanographic records. We conducted a rock-magnetic study of Pacific Ocean red clay to eluc...

    Authors: Toshitsugu Yamazaki, Wei Fu, Takaya Shimono and Yoichi Usui

    Citation: Earth, Planets and Space 2020 72:120

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  12. Nishinoshima is an active oceanic island arc volcano situated approximately 1000 km south of Tokyo, Japan. Since 2016, marine electromagnetic observations using ocean bottom electromagnetometers have been cond...

    Authors: Kiyoshi Baba, Noriko Tada, Hiroshi Ichihara, Yozo Hamano, Hiroko Sugioka, Takao Koyama, Akimichi Takagi and Minoru Takeo

    Citation: Earth, Planets and Space 2020 72:112

    Content type: Express Letter

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  13. The objective of this contribution is to get new insights into the effects of magnetic field variations of natural and anthropogenic origin on broad-band seismic stations. Regarding natural sources of magnetic...

    Authors: J. Díaz, M. Ruiz, J. J. Curto, J. M. Torta, J. Ledo, A. Marcuello and P. Queralt

    Citation: Earth, Planets and Space 2020 72:109

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  14. Spatial gradients in the primary geomagnetic fields directly contribute to both the amplitudes and phases of inter-station transfer functions (IS-TFs). This suggests that, for the analysis of subsurface resist...

    Authors: Shinya Sato, Tada-nori Goto and Katsuaki Koike

    Citation: Earth, Planets and Space 2020 72:105

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  15. An inclusive rock-magnetic and absolute paleointensity survey of the ~ 2-ka-old Xitle volcano (southerly Basin of Mexico) was undertaken to assess the faithfulness of the paleomagnetic log carried by fresh, wi...

    Authors: Juan Morales, Nayeli Pérez-Rodríguez, Avto Goguitchaichvili and Miguel Cervantes-Solano

    Citation: Earth, Planets and Space 2020 72:101

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  16. The central Australian Musgrave Province at the junction of the South, North and West Australian cratons has undergone and continues to retain evidence of significant whole-of-crust, and most likely ‘whole-of-...

    Authors: Stephan Thiel, Bruce R. Goleby, Mark J. Pawley and Graham Heinson

    Citation: Earth, Planets and Space 2020 72:98

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  17. From the launch of the Ørsted satellite in 1999, through the CHAMP mission from 2000 to 2010, and now with the Swarm constellation mission starting in 2013, satellite magnetometry has provided excellent monito...

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

    Citation: Earth, Planets and Space 2020 72:80

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  19. Prospective Proterozoic units in the southern Mount Isa Province are concealed by a poorly defined extent of younger basin cover, leading to poor exploration success. Collection of a magnetotelluric (MT) surve...

    Authors: Janelle M. Simpson and Graham Heinson

    Citation: Earth, Planets and Space 2020 72:69

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  20. The Ramså Basin is situated on the strandflat on the northeastern side of Andøya between Ramså and Skarstein. It is the only known Mesozoic sedimentary basin onshore Norway and therefore represents an easily a...

    Authors: Vikas Chand Baranwal, Marco Brönner, Jan-Steinar Rønning, Harald Elvebakk and Einar Dalsegg

    Citation: Earth, Planets and Space 2020 72:52

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  22. We describe and discuss the preprocessing and calibration steps applied to the magnetic data measured by the three “platform magnetometers” on-board the CryoSat-2 satellite. The calibration is performed by com...

    Authors: Nils Olsen, Giuseppe Albini, Jerome Bouffard, Tommaso Parrinello and Lars Tøffner-Clausen

    Citation: Earth, Planets and Space 2020 72:48

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  23. Magnetotelluric (MT) method is widely used for revealing deep electrical structure. However, natural MT signals are susceptible to cultural noises. In particular, the existing data-processing methods usually f...

    Authors: Guang Li, Xiaoqiong Liu, Jingtian Tang, Juzhi Deng, Shuanggui Hu, Cong Zhou, Chaojian Chen and Wenwu Tang

    Citation: Earth, Planets and Space 2020 72:45

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  24. The Sichuan Basin magnetic anomaly is the most striking regional aeromagnetic anomaly in South China. It is characterized by a continuous large-scale linear magnetic anomaly and contains long-wavelength consti...

    Authors: Jie Wang, Changli Yao, Zelin Li, Yuanman Zheng, Xuhui Shen, Zhima Zeren and Wenlong Liu

    Citation: Earth, Planets and Space 2020 72:40

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  25. The Lorca earthquake (May 11th, 2011, Mw 5.2) stands as the most destructive one in Spain over the last 50 years, interpreted as having occurred in an intersegment zone of the strike–slip Alhama de Murcia Faul...

    Authors: Anna Martí, Pilar Queralt, Alex Marcuello, Juanjo Ledo, Emilio Rodríguez-Escudero, José Jesús Martínez-Díaz, Joan Campanyà and Naser Meqbel

    Citation: Earth, Planets and Space 2020 72:16

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  27. Southern Mongolia is part of the Central Asian Orogenic Belt, the origin and evolution of which is not fully known and is often debated. It is composed of several east–west trending lithostratigraphic domains ...

    Authors: Matthew J. Comeau, Michael Becken, Johannes S. Käufl, Alexander V. Grayver, Alexey V. Kuvshinov, Shoovdor Tserendug, Erdenechimeg Batmagnai and Sodnomsambuu Demberel

    Citation: Earth, Planets and Space 2020 72:5

    Content type: Full paper

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  28. Seawater motion-induced electromagnetic (EM) noise along the seafloor has a large impact on marine magnetotelluric (MT) data quality. Although the mechanical stability of ocean bottom electromagnetic receivers...

    Authors: Kai Chen, Qingxian Zhao, Ming Deng, Xianhu Luo and Jianen Jing

    Citation: Earth, Planets and Space 2020 72:4

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  30. Coseismic electromagnetic (EM) signals that appear from the P arrival were observed in a volcanic area during the 2016 Kumamoto earthquake. In this study, we conduct numerical simulations to explain the coseis...

    Authors: Yao-Chong Sun, Makoto Uyeshima, Hengxin Ren, Qinghua Huang, Koki Aizawa, Kaori Tsukamoto, Wataru Kanda, Kaori Seki, Takahiro Kishita, Takao Ohminato, Atsushi Watanabe, Jiangjun Ran and Xiaofei Chen

    Citation: Earth, Planets and Space 2019 71:143

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  33. The radiocarbon technique is widely used to date Late Pleistocene and Holocene lava flows. The significant difference with palaeomagnetic methods is that the 14C dating is performed on the organic matter carboniz...

    Authors: Goga Vashakidze, Avto Goguitchaichvili, Natalia García-Redondo, Manuel Calvo-Rathert, Ángel Carrancho, Ruben Cejudo, Juan Morales, Vladimir A. Lebedev and Ketino Gabarashvili

    Citation: Earth, Planets and Space 2019 71:133

    Content type: Express Letter

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  34. Finding the statistical intensity signatures of the Earth’s magnetic field over geologic time has helped understanding of the evolution of the Earth’s interior and its interactions with other integral parts of...

    Authors: Hyeon-Seon Ahn and Yuhji Yamamoto

    Citation: Earth, Planets and Space 2019 71:126

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  35. The High Precision Magnetometer (HPM) is one of the main payloads onboard the China Seismo-Electromagnetic Satellite (CSES). The HPM consists of two Fluxgate Magnetometers (FGM) and the Coupled Dark State Magn...

    Authors: Bin Zhou, Bingjun Cheng, Xiaochen Gou, Lei Li, Yiteng Zhang, Jindong Wang, Werner Magnes, Roland Lammegger, Andreas Pollinger, Michaela Ellmeier, Qi Xiao, Xinghong Zhu, Shigeng Yuan, Yanyan Yang and Xuhui Shen

    Citation: Earth, Planets and Space 2019 71:119

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  36. 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

    Content type: Express Letter

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  37. We introduce MoVFEM, a computational algorithm for the modeling of three-dimensional magnetotelluric (MT) data using a vector finite element method of specific order from multiple elements’ orders. Our algorit...

    Authors: Aixa M. Rivera-Rios, Bing Zhou, Graham Heinson and Lars Krieger

    Citation: Earth, Planets and Space 2019 71:92

    Content type: Technical report

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  39. 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

    Content type: Full paper

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  40. 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

    Content type: Technical report

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  41. 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

    Content type: Full paper

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  44. 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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  45. 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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  47. 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

    Content type: Express Letter

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  49. 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

    Content type: Full paper

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