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  1. This study monitors the land subsidence of the whole Pearl River Delta (PRD) (area: ~ 40,000 km2) in China using the ALOS1/PALSAR data (2006–2011) through the SBAS-InSAR method. We also analyze the relationship b...

    Authors: Genger Li, Guangcai Feng, Zhiqiang Xiong, Qi Liu, Rongan Xie, Xiaoling Zhu, Shuran Luo and Yanan Du

    Citation: Earth, Planets and Space 2020 72:179

    Content type: Full paper

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  2. Upper atmospheric conditions are crucial for the safe operation of spacecraft orbiting near Earth and for communication and positioning systems using radio signals. To understand and predict the upper atmosphe...

    Authors: Chihiro Tao, Hidekatsu Jin, Yasunobu Miyoshi, Hiroyuki Shinagawa, Hitoshi Fujiwara, Michi Nishioka and Mamoru Ishii

    Citation: Earth, Planets and Space 2020 72:178

    Content type: Full paper

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  3. Crustal pore pressure, which controls the activities of earthquakes and volcanoes, varies in response to rainfall. The status of pore pressure can be inferred from observed changes in seismic velocity. In this...

    Authors: Rezkia Dewi Andajani, Takeshi Tsuji, Roel Snieder and Tatsunori Ikeda

    Citation: Earth, Planets and Space 2020 72:177

    Content type: Full paper

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  4. An MW 7.1 ~ 50-km-deep intraslab earthquake within the Pacific/Yakutat slab underlying the North American Plate struck Anchorage, southern Alaska, on November 30, 2018. The ground-motion records very close to the...

    Authors: Yujia Guo, Ken Miyakoshi and Masato Tsurugi

    Citation: Earth, Planets and Space 2020 72:176

    Content type: Full paper

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  5. In this study, the seasonal variations of the EEJ longitudinal profiles were examined based on the full CHAMP satellite magnetic measurements from 2001 to 2010. A total of 7537 satellite noon-time passes acros...

    Authors: Zié Tuo, Vafi Doumbia, Pierdavide Coïsson, N’Guessan Kouassi and Abdel Aziz Kassamba

    Citation: Earth, Planets and Space 2020 72:174

    Content type: Full paper

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  6. Solar flares trigger an increase in plasma density in the ionosphere including the D region, and cause the absorption of radio waves, especially in high-frequency (HF) ranges, called short-wave fadeout (SWF). ...

    Authors: Chihiro Tao, Michi Nishioka, Susumu Saito, Daikou Shiota, Kyoko Watanabe, Naoto Nishizuka, Takuya Tsugawa and Mamoru Ishii

    Citation: Earth, Planets and Space 2020 72:173

    Content type: Full paper

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  7. Simultaneously estimating plasma parameters of the ionosphere presents a problem for the incoherent scatter radar (ISR) technique at altitudes between ~ 130 and ~ 300 km. Different mixtures of ion concentratio...

    Authors: Miguel Martínez-Ledesma and Francisco Jaramillo Montoya

    Citation: Earth, Planets and Space 2020 72:172

    Content type: Technical report

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  8. Infrasonic stations are sparse at many volcanoes, especially those on remote islands and those with less frequent eruptions. When only a single infrasound station is available, the seismic–infrasonic cross-cor...

    Authors: Aika K. Kurokawa and Mie Ichihara

    Citation: Earth, Planets and Space 2020 72:171

    Content type: Full paper

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  9. Thermal demagnetization furnaces are widely used paleomagnetic facilities for progressive removal of naturally acquired magnetic remanence or the imparting of well-controlled laboratory magnetization. An ideal...

    Authors: Huafeng Qin, Xiang Zhao, Shuangchi Liu, Greig A. Paterson, Zhaoxia Jiang, Shuhui Cai, Jinhua Li, Qingsong Liu and Rixiang Zhu

    Citation: Earth, Planets and Space 2020 72:170

    Content type: Technical report

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  10. On January 19, 2020, an Mw 6.0 earthquake occurred in Jiashi, Xinjiang Uygur Autonomous Region of China. The epicenter was located at the basin-mountain boundary between the southern Tian Shan and the Tarim Basin...

    Authors: Pengfei Yu, Xuejun Qiao, Wei Xiong, Wei Chen, Zhaosheng Nie, Dijin Wang, Zhige Jia and Jie Li

    Citation: Earth, Planets and Space 2020 72:169

    Content type: Full paper

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  11. We analyzed daily displacement time series from 34 continuous GPS stations in Nepal and 5 continuous GPS stations in South Tibet, China, and extracted the first 4.8 years of postseismic motion after the 2015 M...

    Authors: Lina Su, Fuqiang Shi, Weijun Gan, Xiaoning Su and Junyi Yan

    Citation: Earth, Planets and Space 2020 72:168

    Content type: Full paper

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  12. The COVID-19 pandemic that started at the end of 2019 forced populations around the world to reduce social and economic activities; it is believed that this can prevent the spread of the disease. In this paper...

    Authors: Suguru Yabe, Kazutoshi Imanishi and Kiwamu Nishida

    Citation: Earth, Planets and Space 2020 72:167

    Content type: Full paper

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  13. Sediment lithology, especially the clay mineral fraction, is basic geologic information, which is important for understanding faulting and evolutionary process of the accretionary prism. During scientific dril...

    Authors: Suguru Yabe, Rina Fukuchi, Yohei Hamada and Gaku Kimura

    Citation: Earth, Planets and Space 2020 72:166

    Content type: Full paper

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  14. Ionospheric irregularities can affect satellite communication and navigation by causing scintillations of radio signals. The scintillations are routinely measured using ground-based networks of receivers. This...

    Authors: Sharon Aol, Stephan Buchert and Edward Jurua

    Citation: Earth, Planets and Space 2020 72:164

    Content type: Full paper

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  15. We present a new model of the geomagnetic field spanning the last 20 years and called Kalmag. Deriving from the assimilation of CHAMP and Swarm vector field measurements, it separates the different contributio...

    Authors: Julien Baerenzung, Matthias Holschneider, Johannes Wicht, Vincent Lesur and Sabrina Sanchez

    Citation: Earth, Planets and Space 2020 72:163

    Content type: Full paper

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  16. Electric currents flowing in the terrestrial ionosphere have conventionally been diagnosed by low-earth-orbit (LEO) satellites equipped with science-grade magnetometers and long booms on magnetically clean sat...

    Authors: Jaeheung Park, Claudia Stolle, Yosuke Yamazaki, Jan Rauberg, Ingo Michaelis and Nils Olsen

    Citation: Earth, Planets and Space 2020 72:162

    Content type: Full paper

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  17. We aimed to perform three-dimensional imaging of the underlying geothermal system to a depth of 2 km using magnetotellurics (MT) at around the Yugama crater, the Kusatsu–Shirane Volcano, Japan, which is known ...

    Authors: Kuo Hsuan Tseng, Yasuo Ogawa, Nurhasan, Sabri Bülent Tank, Naoto Ujihara, Yoshimori Honkura, Akihiko Terada, Yoshiya Usui and Wataru Kanda

    Citation: Earth, Planets and Space 2020 72:161

    Content type: Express Letter

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  18. 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

    Content type: Full paper

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  19. Postseismic Global Navigation Satellite System (GNSS) time series followed by megathrust earthquakes can be interpreted as a result of afterslip on the plate interface, especially in its early phase. Afterslip...

    Authors: Masayuki Kano, Shin’ichi Miyazaki, Yoichi Ishikawa and Kazuro Hirahara

    Citation: Earth, Planets and Space 2020 72:159

    Content type: Full paper

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  20. A driving stress of the Mw5.8 reverse-faulting Awaji Island earthquake (2013), southwest Japan, was investigated using focal mechanism solutions of earthquakes before and after the mainshock. The seismic records ...

    Authors: Kazutoshi Imanishi, Makiko Ohtani and Takahiko Uchide

    Citation: Earth, Planets and Space 2020 72:158

    Content type: Full paper

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  21. 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

    Content type: Full paper

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  22. 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

    Content type: Full paper

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  23. 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

    Content type: Full paper

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  24. 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

    Content type: Full paper

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  25. 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

    Content type: Full paper

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  26. Nine cycles of Haiyang-2A (HY-2A) IGDR (Interim Geophysical Data Record) data are used to derive gravity products over the Gulf of Guinea (15° W–5° E, 4° S–4° N). Firstly, the sea surface heights (SSH) and ver...

    Authors: Xiaoyun Wan, Richard Fiifi Annan and Wenbin Wang

    Citation: Earth, Planets and Space 2020 72:151

    Content type: Full paper

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  27. 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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  28. 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

    Content type: Full paper

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  29. The formation of aggregates consisting of snow, water, and tephra has been reported in small-scale experiments on three-phase flows containing tephra, water, and snow, representing lahars triggered by snowmelt...

    Authors: Hirofumi Niiya, Kenichi Oda, Daisuke Tsuji and Hiroaki Katsuragi

    Citation: Earth, Planets and Space 2020 72:148

    Content type: Full paper

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  30. In this study, we have derived field-aligned currents (FACs) from magnetometers onboard the Defense Meteorological Satellite Project (DMSP) satellites. The magnetic latitude versus local time distribution of F...

    Authors: Chao Xiong, Claudia Stolle, Patrick Alken and Jan Rauberg

    Citation: Earth, Planets and Space 2020 72:147

    Content type: Full paper

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  31. The technique of spherical elementary current systems (SECS) is a powerful way to determine ionospheric and field-aligned currents (FAC) from magnetic field measurements made by low-Earth-orbiting satellites, ...

    Authors: Heikki Vanhamäki, Astrid Maute, Patrick Alken and Huixin Liu

    Citation: Earth, Planets and Space 2020 72:146

    Content type: Full paper

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  32. We present detailed maps of local-scale 3D deformation preceding the 2018 phreatic eruption at Iwo-yama volcano (south of Kyushu Island, Japan), using a combination of airborne and spaceborne Interferometric S...

    Authors: Shohei Narita, Taku Ozawa, Yosuke Aoki, Masanobu Shimada, Masato Furuya, Youichiro Takada and Makoto Murakami

    Citation: Earth, Planets and Space 2020 72:145

    Content type: Full paper

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  33. The 2016 Kumamoto earthquake sequence on April 14 (Mw 6.2) and April 16 (Mw 7.0) altered the regional groundwater level. To better understand the relationship between groundwater level change and surface displace...

    Authors: Kazuya Ishitsuka, Takeshi Tsuji, Weiren Lin, Makoto Kagabu and Jun Shimada

    Citation: Earth, Planets and Space 2020 72:144

    Content type: Full paper

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  34. Obtaining horizontal edges and the buried depths of geological bodies, using potential field tensor data directly is an outstanding question. The largest eigenvalue of the structure tensor is one of the common...

    Authors: Yuan Yuan, Xiangyu Zhang, Wenna Zhou, Guochao Wu and Weidong Luo

    Citation: Earth, Planets and Space 2020 72:143

    Content type: Full paper

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  35. We propose a normal-stress-dependent Nagata law. Nagata et al. (J Geophys Res 117:B02314, 2012) revised the rate- and state-dependent friction law by introducing the shear stress dependence. We further extende...

    Authors: Shingo Yoshida, Takuto Maeda and Naoyuki Kato

    Citation: Earth, Planets and Space 2020 72:141

    Content type: Full paper

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  36. This paper used the similarities between the ionospheres on Mars and Earth, the most similar of the terrestrial planets, to examine the relative importance of photochemical and transport processes at dawn and ...

    Authors: Angeline G. Burrell, Beatriz Sánchez-Cano, Olivier Witasse, Mark Lester and Marco Cartacci

    Citation: Earth, Planets and Space 2020 72:140

    Content type: Full paper

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  37. 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

    Content type: Full paper

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  38. Recent increases in global temperature have stimulated permafrost degradation associated with landform deformation caused by the melting of excess ground ice (thermokarst). Central Yakutia is underlain by ice-...

    Authors: Takahiro Abe, Go Iwahana, Petr V. Efremov, Alexey R. Desyatkin, Takumi Kawamura, Alexander Fedorov, Yuri Zhegusov, Kazuki Yanagiya and Takeo Tadono

    Citation: Earth, Planets and Space 2020 72:138

    Content type: Full paper

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  39. Site-dependent bulk permittivities of the lunar uppermost media with thicknesses of tens to hundreds meters were estimated based on the data from Lunar Radar Sounder onboard the Selenological and Engineering E...

    Authors: Keigo Hongo, Hiroaki Toh and Atsushi Kumamoto

    Citation: Earth, Planets and Space 2020 72:137

    Content type: Full paper

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  40. 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

    Content type: Full paper

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  41. Improving the ability to detect and characterize long-duration volcanic tremor is crucial to understand the long-term dynamics and unrest of volcanic systems. We have applied data reduction methods (permutatio...

    Authors: Ivan Melchor, Javier Almendros, Roberto Carniel, Kostas I. Konstantinou, Marcia Hantusch and Alberto Caselli

    Citation: Earth, Planets and Space 2020 72:134

    Content type: Express Letter

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  42. We developed universal sample holders [the Kochi grid, Kochi clamp, and Okazaki cell) and a transfer vessel (facility-to-facility transfer container (FFTC)] to analyze sensitive and fragile samples, such as ex...

    Authors: Motoo Ito, Naotaka Tomioka, Kentaro Uesugi, Masayuki Uesugi, Yu Kodama, Ikuya Sakurai, Ikuo Okada, Takuji Ohigashi, Hayato Yuzawa, Akira Yamaguchi, Naoya Imae, Yuzuru Karouji, Naoki Shirai, Toru Yada and Masanao Abe

    Citation: Earth, Planets and Space 2020 72:133

    Content type: Technical report

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  43. We applied differential InSAR analysis to the Shiretoko Peninsula, northeastern Hokkaido, Japan. All the interferograms of long temporal baseline (~ 3 years) processed from SAR data of three L-band satellites ...

    Authors: Youichiro Takada and George Motono

    Citation: Earth, Planets and Space 2020 72:131

    Content type: Full paper

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  44. We have identified “N”-shaped Y/X amplitude spectral ratios in S-coda records from a significant number of OBSs (ocean bottom seismometers) belonging to in-line-type ocean bottom networks of S-net and ETMC dep...

    Authors: Kaoru Sawazaki and Takeshi Nakamura

    Citation: Earth, Planets and Space 2020 72:130

    Content type: Full paper

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