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4. Seismology

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  1. Small-scale seismic velocity heterogeneity has been studied through the calculation of peak amplitude ratio as a means to quantify the strength of seismic wave scattering at volcanoes in Japan. This ratio is d...

    Authors: Gugi Ganefianto, Hisashi Nakahara and Takeshi Nishimura

    Citation: Earth, Planets and Space 2021 73:207

    Content type: Express Letter

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  2. The Shanxi Rift located in the central part of the North China Craton (NCC) as a boundary between the Ordos block and the Huabei basin. The Shanxi graben system is a Cenozoic rift and originated from back-arc ...

    Authors: Yifang Chen, Jiuhui Chen, ShunCheng Li, Zhanyang Yu, Xuzhou Liu and Xuzhang Shen

    Citation: Earth, Planets and Space 2021 73:200

    Content type: Full paper

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  3. The southern part of the Ryukyu subduction zone has recorded tsunami events with a recurrence interval of several hundred years. Although their source is controversial, one model suggests that the last 1771 Ya...

    Authors: Masayuki Kano, Aoi Ikeuchi, Takuya Nishimura, Shin’ichi Miyazaki and Takeshi Matsushima

    Citation: Earth, Planets and Space 2021 73:199

    Content type: Express Letter

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  4. The study of slow earthquake activity, which occurs in the shallow and deep sides of seismogenic zone, is crucial for understanding subduction zones, including variations in frictional properties with depth an...

    Authors: Yusuke Yamashita, Masanao Shinohara and Tomoaki Yamada

    Citation: Earth, Planets and Space 2021 73:196

    Content type: Express Letter

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  5. The Median Tectonic Line (MTL) is a thousand-kilometer-long fault that extends across southwest Japan. Near the Nyugawa region of Shikoku, the MTL comprises (i) a low-angle inactive terrane boundary fault (the MT...

    Authors: Masahiro Miyawaki and Arito Sakaguchi

    Citation: Earth, Planets and Space 2021 73:194

    Content type: Express Letter

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  6. Low-frequency tremors have been widely detected in many tectonic zones, and are often located adjacent to megathrust zones, indicating that their spatiotemporal evolution provides important insights into megat...

    Authors: Hidenobu Takahashi, Kazuya Tateiwa, Keisuke Yano and Masayuki Kano

    Citation: Earth, Planets and Space 2021 73:186

    Content type: Express Letter

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  7. Along the Nankai Trough subduction zone, southwest Japan, short-term slow slip events (SSEs) are commonly detected in strain and tilt records. These observational data have been used in rectangular fault model...

    Authors: Takahiro Tsuyuki, Akio Kobayashi, Reiko Kai, Takeshi Kimura and Satoshi Itaba

    Citation: Earth, Planets and Space 2021 73:181

    Content type: Full paper

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  8. This study aims to synthesize seismic observations with gravity and magnetic data and to suggest a new scenario on the development of the Harrat Lunayyir (HL) tectonic system on the eastern Red Sea coastline, ...

    Authors: Ali K. Abdelfattah, Chokri Jallouli, Mohamed Fnais, Saleh Qaysi, Hassan Alzahrani and Saad Mogren

    Citation: Earth, Planets and Space 2021 73:178

    Content type: Full paper

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  9. We investigated changes in the b value of the Gutenberg–Richter’s law in and around the focal areas of earthquakes on March 20 and on May 1, 2021, with magnitude (M) 6.9 and 6.8, respectively, which occurred off ...

    Authors: K. Z. Nanjo and A. Yoshida

    Citation: Earth, Planets and Space 2021 73:176

    Content type: Express Letter

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  10. Here we investigate the influence of the lithology and thermal state of the upper crust on earthquake distributions beneath the Wakayama region, southern Honshu, Japan, to better understand the influence of cr...

    Authors: Sumire Maeda, Shinji Toda, Toru Matsuzawa, Makoto Otsubo and Takumi Matsumoto

    Citation: Earth, Planets and Space 2021 73:173

    Content type: Express Letter

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    The Correction to this article has been published in Earth, Planets and Space 2021 73:205

  11. The evolution history of the Sea of Japan back-arc basin remains under debate, involving the opening of sub-basins such as the Japan and Yamato Basins. Detailed knowledge of the lithospheric structure will pro...

    Authors: Takeshi Akuhara, Kazuo Nakahigashi, Masanao Shinohara, Tomoaki Yamada, Hajime Shiobara, Yusuke Yamashita, Kimihiro Mochizuki and Kenji Uehira

    Citation: Earth, Planets and Space 2021 73:171

    Content type: Full paper

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  12. We analyze temporal variations in the travel times of both P and S waves (Vp and Vs) for 14 months at Toyohashi (central Japan) with a continuously operating vibration source that could efficiently produce bot...

    Authors: Rina Suzuki, Koshun Yamaoka, Shuhei Tsuji and Toshiki Watanabe

    Citation: Earth, Planets and Space 2021 73:152

    Content type: Full paper

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  13. In the present study, we propose a new approach for determining earthquake hypocentral parameters. This approach integrates computed theoretical seismograms and deep machine learning. The theoretical seismogra...

    Authors: Daisuke Sugiyama, Seiji Tsuboi and Yohei Yukutake

    Citation: Earth, Planets and Space 2021 73:135

    Content type: Full paper

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  14. Slow slip and tremor (SST) downdip of the seismogenic zones may trigger megathrust earthquakes by frequently transferring stress to seismogenic zones. Geodetic observations have suggested that the recurrence i...

    Authors: Naoki Nishiyama, Kohtaro Ujiie and Masayuki Kano

    Citation: Earth, Planets and Space 2021 73:126

    Content type: Express Letter

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  15. We present here an analysis of the destructive Mw 6.2 earthquake sequence that took place on 14 January 2021 in Mamuju–Majene, West Sulawesi, Indonesia. Our relocated foreshocks, mainshock, and aftershocks and...

    Authors: Pepen Supendi, Mohamad Ramdhan, Priyobudi, Dimas Sianipar, Adhi Wibowo, Mohamad Taufik Gunawan, Supriyanto Rohadi, Nelly Florida Riama, Daryono, Bambang Setiyo Prayitno, Jaya Murjaya, Dwikorita Karnawati, Irwan Meilano, Nicholas Rawlinson, Sri Widiyantoro, Andri Dian Nugraha…

    Citation: Earth, Planets and Space 2021 73:106

    Content type: Express Letter

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  16. Thick sediment layers frequently cover the Japan islands’ surface, and their frictional properties significantly affect the shallow slip behavior that occurs during earthquakes. However, laboratory data on the...

    Authors: Kazuo Mizoguchi, Shin-ichi Uehara, Takehiro Hirose and Sachiko Iizuka

    Citation: Earth, Planets and Space 2021 73:101

    Content type: Full paper

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  17. We make trial binary forecasts for the Kurile–Japan subduction zone for the period 1988–2014 by hypothesizing that seismic quiescence (i.e., the absence of earthquakes of M ≥ 5 for a minimum period of Tq) is a pr...

    Authors: Kei Katsumata and Masao Nakatani

    Citation: Earth, Planets and Space 2021 73:100

    Content type: Full paper

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  18. On November 11, 2018, an event generating long-lasting, monotonic long-period surface waves was observed by seismographs around the world. This event occurred at around 09:28 UTC east of the Mayotte Island, in...

    Authors: Hossein Sadeghi and Sadaomi Suzuki

    Citation: Earth, Planets and Space 2021 73:97

    Content type: Full paper

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  19. Homogeneous and accurate hypocenter distribution along the Japan Trench is important to better understand the process of plate subduction and the occurrence mode of large earthquakes. The seafloor seismic netw...

    Authors: Koji Tamaribuchi, Fuyuki Hirose, Akemi Noda, Yuriko Iwasaki, Kazuhiro Iwakiri and Hiroshi Ueno

    Citation: Earth, Planets and Space 2021 73:91

    Content type: Full paper

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  20. In the coupled electric interaction of rock fractures and gas invasion, that is, when gases interact with newly created crack surfaces, the unpaired electrons within the rock crystal defects are thermally stim...

    Authors: Yuji Enomoto, Tsuneaki Yamabe, Shigeki Sugiura and Hitoshi Kondo

    Citation: Earth, Planets and Space 2021 73:90

    Content type: Express Letter

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    The Correction to this article has been published in Earth, Planets and Space 2021 73:185

    The Correction to this article has been published in Earth, Planets and Space 2021 73:149

  21. Lateral spatial variations of weak portions at the plate boundary in subduction zones have been estimated primarily by the distribution of slow earthquakes mainly occurring around seismogenic zones. However, t...

    Authors: Takashi Tonegawa, Toshinori Kimura, Kazuya Shiraishi, Suguru Yabe, Yoshio Fukao, Eiichiro Araki, Masataka Kinoshita, Yoshinori Sanada, Seiichi Miura, Yasuyuki Nakamura and Shuichi Kodaira

    Citation: Earth, Planets and Space 2021 73:89

    Content type: Full paper

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    The Correction to this article has been published in Earth, Planets and Space 2021 73:104

  22. The geometries (i.e., dip angles) of active faults from the surface to the seismogenic zone are the most important factors used to evaluate earthquake ground motion, which is crucial for seismic hazard assessm...

    Authors: Hayami Nishiwaki, Takamoto Okudaira, Kazuhiko Ishii and Muneki Mitamura

    Citation: Earth, Planets and Space 2021 73:86

    Content type: Full paper

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  23. Late Quaternary tectonic deformation of coastal areas is usually examined based on the height distribution of paleo-shorelines observed on marine terraces. However, it is difficult to examine deformation along...

    Authors: Hideaki Goto

    Citation: Earth, Planets and Space 2021 73:75

    Content type: Express Letter

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  24. Tsunami hazard in the Eastern Mediterranean Basin (EMB) has attracted attention following three tsunamis in this basin since 2017 namely the July 2017 and October 2020 Turkey/Greece and the May 2020 offshore C...

    Authors: Mohammad Heidarzadeh and Aditya Riadi Gusman

    Citation: Earth, Planets and Space 2021 73:74

    Content type: Full paper

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  25. A tsunami earthquake is an earthquake event that generates abnormally high tsunami waves considering the amplitude of the seismic waves. These abnormally high waves relative to the seismic wave amplitude are r...

    Authors: Akio Katsumata, Masayuki Tanaka and Takahito Nishimiya

    Citation: Earth, Planets and Space 2021 73:72

    Content type: Full paper

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  26. Distributed acoustic sensing (DAS) is a new method that measures the strain change along a fiber-optic cable and has emerged as a promising geophysical application across a wide range of research and monitorin...

    Authors: Satoshi Ide, Eiichiro Araki and Hiroyuki Matsumoto

    Citation: Earth, Planets and Space 2021 73:63

    Content type: Express Letter

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  27. Slip phenomena on plate interfaces reflect the heterogeneous physical properties of the slip plane and, thus, exhibit a wide variety of slip velocities and rupture propagation behaviors. Recent findings on slo...

    Authors: Keita Nakamoto, Yoshihiro Hiramatsu, Takahiko Uchide and Kazutoshi Imanishi

    Citation: Earth, Planets and Space 2021 73:59

    Content type: Full paper

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    The Correction to this article has been published in Earth, Planets and Space 2021 73:98

  28. The Mw7.0 2016 Kumamoto earthquake occurred on the previously mapped Futagawa–Hinagu fault causing significant strong ground motions. A ~ 30-km-long dextral surface rupture appeared on the major fault zone and...

    Authors: Daisuke Ishimura, Hiroyuki Tsutsumi, Shinji Toda, Yo Fukushima, Yasuhiro Kumahara, Naoya Takahashi, Toshihiko Ichihara and Keita Takada

    Citation: Earth, Planets and Space 2021 73:39

    Content type: Full paper

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  29. The Seafloor Observation Network for Earthquakes and Tsunamis along the Japan Trench (S-net) is presently the world’s largest network of ocean bottom pressure sensors for real-time tsunami monitoring. This pap...

    Authors: Iyan E. Mulia and Kenji Satake

    Citation: Earth, Planets and Space 2021 73:36

    Content type: Full paper

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    The Correction to this article has been published in Earth, Planets and Space 2021 73:69

  30. Distinct later phases of waves with rich high-frequency (> 8 Hz) components were observed for intraslab earthquakes that occurred at intermediate depths, particularly at depths exceeding 100 km, in the northea...

    Authors: Takahiro Shiina, Kei Katsumata, Kiyoshi Yomogida and Aitaro Kato

    Citation: Earth, Planets and Space 2021 73:33

    Content type: Full paper

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  31. Although seismic amplitudes can be used to estimate event locations for volcanic tremors and other seismic events with unclear phase arrival times, the precision of such estimates is strongly affected by site ...

    Authors: Masashi Ogiso and Kiyoshi Yomogida

    Citation: Earth, Planets and Space 2021 73:29

    Content type: Full paper

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  32. Laboratory experiments with seismic measurements have the potential to be highly useful for understanding the physical process of water-induced landslides, and fundamental experiments are helpful for the appro...

    Authors: Masayuki Nakayama, Hironori Kawakata, Shiro Hirano and Issei Doi

    Citation: Earth, Planets and Space 2021 73:25

    Content type: Technical report

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  33. The east coast of the Tohoku district, Japan has a high seismicity, including aftershocks of the 2011 M9 Tohoku earthquake. We analyzed 1142 earthquakes with http://static-content.springer.com/image/art%3A10.1186%2Fs40623-020-01326-8/40623_2020_1326_Article_IEq1.gif

    Authors: Takuji Yamada, Meitong Duan and Jun Kawahara

    Citation: Earth, Planets and Space 2021 73:18

    Content type: Full paper

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  34. We propose a new waveform inversion method to estimate the 2D S-wave velocity structure of deep sedimentary layers using broadband Love waves. As a preprocessing operation in our inversion scheme, we decompose...

    Authors: Kentaro Kasamatsu, Hiroaki Yamanaka and Shin’ichi Sakai

    Citation: Earth, Planets and Space 2021 73:17

    Content type: Full paper

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  35. We conducted centroid moment tensor (CMT) inversions of moderate (Mw 4.5–6.5) earthquakes in the Kanto region, Japan, using a local three-dimensional (3D) model. We then investigated the effects of our 3D CMT sol...

    Authors: Shunsuke Takemura, Kazuo Yoshimoto and Katsuhiko Shiomi

    Citation: Earth, Planets and Space 2021 73:15

    Content type: Full paper

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  36. We quantitatively examined the influence of pore fluid pressure and coseismic stress changes on the seismicity rate changes that followed the 2016 Kumamoto earthquake, on the basis of two approaches. One is a ...

    Authors: Kodai Nakagomi, Toshiko Terakawa, Satoshi Matsumoto and Shinichiro Horikawa

    Citation: Earth, Planets and Space 2021 73:11

    Content type: Full paper

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    The Correction to this article has been published in Earth, Planets and Space 2021 73:24

  37. Surface waves from the 2017 Mw8.2 Tehuantepec earthquake remotely triggered tectonic tremors in the Jalisco region, approximately 1000 km WNW in the northern Mexican subduction zone. This is the first observation...

    Authors: Masatoshi Miyazawa and Miguel Ángel Santoyo

    Citation: Earth, Planets and Space 2021 73:6

    Content type: Full paper

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  38. The tectonic stress field was investigated in and around the aftershock area of the Hokkaido Eastern Iburi earthquake (MJMA = 6.7) occurred on 6 September 2018. We deployed 26 temporary seismic stations in the af...

    Authors: Yuki Susukida, Kei Katsumata, Masayoshi Ichiyanagi, Mako Ohzono, Hiroshi Aoyama, Ryo Tanaka, Masamitsu Takada, Teruhiro Yamaguchi, Kazumi Okada, Hiroaki Takahashi, Shin’ichi Sakai, Satoshi Matsumoto, Tomomi Okada, Toru Matsuzawa, Hiroki Miyamachi, Shuichiro Hirano…

    Citation: Earth, Planets and Space 2021 73:1

    Content type: Full paper

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  39. We used near-field strong-motion data to investigate the complex combination of source effect and site response for two recent disastrous earthquakes in southwest Taiwan. We estimated strong-motion generation ...

    Authors: Yi-Ying Wen, Yin-Tung Yen, Chun-Hsiang Kuo and Kuo‐En Ching

    Citation: Earth, Planets and Space 2020 72:188

    Content type: Full paper

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  40. 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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