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4. Seismology

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  1. Deep low-frequency tremors and short-term slow slip events (SSEs) are known to occur along the Nankai Trough in Japan. Although short-term SSEs are thought to occur repeatedly in the northern part of Ise Bay, ...

    Authors: Yuichi Kitagawa, Norio Matsumoto and Takeshi Kimura

    Citation: Earth, Planets and Space 2020 72:90

    Content type: Full paper

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  2. The southwestern Kuril trench is seismically active due to the subduction of the Pacific plate. Great earthquakes in this zone have frequently induced fatal disasters. Seismic monitoring and hypocenter catalog...

    Authors: Masayoshi Ichiyanagi, Valentin Mikhaylov, Dmitry Kostylev, Yuri Levin and Hiroaki Takahashi

    Citation: Earth, Planets and Space 2020 72:86

    Content type: Technical report

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  3. To explore a local relationship between geological structures and the occurrence of very-low-frequency earthquakes (VLFEs), a particular class of slow earthquakes with characteristic periods of 10–100 s, we in...

    Authors: Kazuya Shiraishi, Yasuhiro Yamada, Masaru Nakano, Masataka Kinoshita and Gaku Kimura

    Citation: Earth, Planets and Space 2020 72:72

    Content type: Full paper

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  4. Inelastic deformation due to seismic activity is an important signal that reflects fault evolution. In particular, aftershock sequences indicate the evolution of damage in a medium that has experienced a large...

    Authors: Satoshi Matsumoto, Yoshihisa Iio, Shinichi Sakai and Aitaro Kato

    Citation: Earth, Planets and Space 2020 72:62

    Content type: Full paper

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  5. The Global Navigation Satellite System network in Japan detected transient crustal deformation along the Nankai trough, Japan, from June 2018. Time-dependent inversion analysis shows that a long-term slow slip...

    Authors: Shinzaburo Ozawa, Ryouji Kawabata, Kensuke Kokado and Hiroshi Yarai

    Citation: Earth, Planets and Space 2020 72:61

    Content type: Express Letter

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  6. Plate-boundary earthquakes of magnitude 8 or greater along the Suruga–Nankai Trough subduction zone have repeated at intervals of 90–150 years, but with widely varying magnitudes and rupture areas. We propose,...

    Authors: Yukinobu Okamura and Masanobu Shishikura

    Citation: Earth, Planets and Space 2020 72:55

    Content type: Full paper

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  7. Previous studies have suggested submarine landslides as sources of the tsunami that damaged coastal areas of Palu Bay after the 2018 Sulawesi earthquake. Indeed, tsunami run-up heights as high as 10 m determin...

    Authors: Kenji Nakata, Akio Katsumata and Abdul Muhari

    Citation: Earth, Planets and Space 2020 72:44

    Content type: Full paper

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  8. To clarify the relationship between earthquake occurrence and fluid, we analyzed data from a dense aftershock-observation network with 69 high-gain short-period seismographs installed immediately after the mai...

    Authors: Yoshihisa Iio, Satoshi Matsumoto, Yusuke Yamashita, Shin’ichi Sakai, Kazuhide Tomisaka, Masayo Sawada, Takashi Iidaka, Takaya Iwasaki, Megumi Kamizono, Hiroshi Katao, Aitaro Kato, Eiji Kurashimo, Yoshiko Teguri, Hiroo Tsuda and Takashi Ueno

    Citation: Earth, Planets and Space 2020 72:42

    Content type: Express Letter

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  9. We have explored tsunami current signals in maritime Automatic Identification System (AIS) data during the 2011 Tohoku, Japan, tsunami. The AIS data were investigated in detail taking into account ship motion ...

    Authors: Daisuke Inazu, Tsuyoshi Ikeya, Toshio Iseki and Takuji Waseda

    Citation: Earth, Planets and Space 2020 72:41

    Content type: Full paper

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  10. The 2018, Hokkaido Eastern Iburi, Japan, earthquake is an event characterized by complexity of the rupture process and slip pattern, which may involve both reverse and strike-slip motion depending on the locat...

    Authors: Tatsuya Hisakawa, Ryosuke Ando, Tomoko Elizabeth Yano and Makoto Matsubara

    Citation: Earth, Planets and Space 2020 72:36

    Content type: Full paper

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  11. The present study presents the analysis of a moderate earthquake (Mw 4.0) and its largest aftershocks located along the Red Sea coast, southwestern Saudi Arabia, with the aim to understand the enigma of peculi...

    Authors: Ali K. Abdelfattah, Abdullah Al-amri, M. Sami Soliman, Faisal K. Zaidi, Saleh Qaysi, Mohamed Fnais, Sattam Almadani and Nassir Al-Arifi

    Citation: Earth, Planets and Space 2020 72:34

    Content type: Full paper

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  12. The Nankai Trough in Southwest Japan exhibits a wide spectrum of fault slip, with long-term and short-term slow-slip events, slow and fast earthquakes, all associated with different segments down the plate int...

    Authors: Qibin Shi, Sylvain Barbot, Shengji Wei, Paul Tapponnier, Takanori Matsuzawa and Bunichiro Shibazaki

    Citation: Earth, Planets and Space 2020 72:27

    Content type: Full paper

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  13. Six wells were continuously monitored in Hokkaido, northern Japan, to relate groundwater level changes to regional seismic activity. Groundwater level changes following the 2018 Hokkaido Eastern Iburi earthqua...

    Authors: Tomo Shibata, Ryo Takahashi, Hiroaki Takahashi, Takanori Kagoshima, Naoto Takahata, Yuji Sano and Daniele L. Pinti

    Citation: Earth, Planets and Space 2020 72:23

    Content type: Express Letter

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  14. In this study, we investigate the source rupture process of the 2018 Hokkaido Eastern Iburi earthquake in Japan (MJMA 6.7) and how the ground motion can be reproduced using available source and velocity models. F...

    Authors: Hisahiko Kubo, Asako Iwaki, Wataru Suzuki, Shin Aoi and Haruko Sekiguchi

    Citation: Earth, Planets and Space 2020 72:20

    Content type: Express Letter

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  15. To continuously monitor crustal behavior associated with earthquakes, magmatic activities and other environmental effects (e.g., tides and rain precipitation), we have developed a continuous monitoring system ...

    Authors: Fernando Lawrens Hutapea, Takeshi Tsuji and Tatsunori Ikeda

    Citation: Earth, Planets and Space 2020 72:19

    Content type: Technical report

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  16. We derived a three-dimensional S-wave velocity model for the San-in area of southwest Japan to examine heterogeneous structures such as tectonic faults. Many earthquakes occur in this area, but much of the act...

    Authors: Yudai Suemoto, Tatsunori Ikeda, Takeshi Tsuji and Yoshihisa Iio

    Citation: Earth, Planets and Space 2020 72:15

    Content type: Full paper

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  17. We examined seismic moment release rates as estimated from deep low-frequency tremors at episodic tremor and slip (ETS) zones on the plate interface in the Nankai subduction zone. Excluding periods with long-t...

    Authors: Yoko Kono, Keita Nakamoto and Yoshihiro Hiramatsu

    Citation: Earth, Planets and Space 2020 72:12

    Content type: Express Letter

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  18. We used recently collected bathymetric data and published gravity data to examine the effective elastic thickness of the lithosphere and the crustal thickness beneath the Ojin Rise Seamounts, located east of S...

    Authors: Shoka Shimizu, Masao Nakanishi and Takashi Sano

    Citation: Earth, Planets and Space 2020 72:11

    Content type: Express Letter

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  19. Recent global navigation satellite system (GNSS) data for the Japanese Islands have revealed a high-strain-rate region suggesting the existence of a region of broad-scale crustal deformation. The Niigata–Kobe ...

    Authors: Tomonori Tamura, Kiyokazu Oohashi, Makoto Otsubo, Ayumu Miyakawa and Masakazu Niwa

    Citation: Earth, Planets and Space 2020 72:7

    Content type: Full paper

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  20. The b-value of the Gutenberg–Richter law represents the ratio of earthquake magnitude to frequency of occurrence and is inversely proportional to differential stress. Repeating long-term slow-slip events (SSEs) a...

    Authors: Keita Chiba

    Citation: Earth, Planets and Space 2020 72:3

    Content type: Full paper

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    The Correction to this article has been published in Earth, Planets and Space 2020 72:22

  21. A large Mw 7.5 earthquake occurred at 18.03 on 28 September 2018 in the Donggala–Palu area of Central Sulawesi, Indonesia, which triggered a tsunami, liquefaction, and landslides. A 160-km rupture zone was for...

    Authors: Asri Jaya, Osamu Nishikawa and Sahabuddin Jumadil

    Citation: Earth, Planets and Space 2019 71:144

    Content type: Full paper

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  22. Along subduction interfaces or some major faults, a seismogenic layer in the upper crust is underlain by a zone of slow-slip events (SSEs) and tremors, and seismicity disappears at greater depths. The transiti...

    Authors: Yuki Miyake and Hiroyuki Noda

    Citation: Earth, Planets and Space 2019 71:137

    Content type: Full paper

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  23. We evaluated water distributions in deformed quartz in schists along the Asemi River, Central Shikoku, in the Sanbagawa Metamorphic Belt, Japan, using infrared spectroscopic (IR) mapping. The water trapped in ...

    Authors: Jun-ichi Fukuda and Ichiko Shimizu

    Citation: Earth, Planets and Space 2019 71:136

    Content type: Full paper

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  24. We investigated temporal changes in the waveforms of S-coda from triggered earthquakes around the Moriyoshi-zan volcano in northeastern Japan. Seismicity in the area has drastically increased after the 2011 of...

    Authors: Yuta Amezawa, Masahiro Kosuga and Takuto Maeda

    Citation: Earth, Planets and Space 2019 71:132

    Content type: Full paper

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  25. The large slip along the shallow subduction interface during the 2011 Tohoku-Oki earthquake (Mw9.0) caused a huge tsunami that struck the northeast coast of Honshu, Japan. The Integrated Ocean Drilling Program Ex...

    Authors: Jun Kameda, Masaoki Uno, Marianne Conin, Kohtaro Ujiie, Yohei Hamada and Gaku Kimura

    Citation: Earth, Planets and Space 2019 71:131

    Content type: Full paper

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  26. We applied the epidemic type aftershock sequence (ETAS) model, the two-stage ETAS model and the non-stationary ETAS model to investigate the detailed features of the series of earthquake occurrences before and...

    Authors: Takao Kumazawa, Yosihiko Ogata and Hiroshi Tsuruoka

    Citation: Earth, Planets and Space 2019 71:130

    Content type: Full paper

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  27. Elastic wave velocity and electrical conductivity in a brine-saturated granitic rock were measured under confining pressures of up to 150 MPa and microstructure of pores was examined with SEM on ion-milled sur...

    Authors: Tohru Watanabe, Miho Makimura, Yohei Kaiwa, Guillaume Desbois, Kenta Yoshida and Katsuyoshi Michibayashi

    Citation: Earth, Planets and Space 2019 71:129

    Content type: Full paper

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  28. The 2016 Kumamoto earthquake, whose main shock was an M7.3 event on April 16, 2016, 28 h after a foreshock of M6.5, caused severe damage in and around Kumamoto Prefecture, Japan. It also caused postseismic hyd...

    Authors: Naoji Koizumi, Shinsuke Minote, Tatsuya Tanaka, Azumi Mori, Takumi Ajiki, Tsutomu Sato, Hiroshi A. Takahashi and Norio Matsumoto

    Citation: Earth, Planets and Space 2019 71:128

    Content type: Full paper

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  29. I relocated the hypocenters of the 2018 M6.7 Hokkaido Eastern Iburi earthquake and its surrounding area, using a three-dimensional seismic structure, the double-difference relocation method, and the JMA earthq...

    Authors: Saeko Kita

    Citation: Earth, Planets and Space 2019 71:122

    Content type: Full paper

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  30. Density perturbations accompanying seismic waves are expected to generate prompt gravity perturbations preceding the arrival of P-waves. Vallée et al. (Science 358:1164–1168, 2017, https://doi.org/10.1126/scie...

    Authors: Masaya Kimura, Nobuki Kame, Shingo Watada, Makiko Ohtani, Akito Araya, Yuichi Imanishi, Masaki Ando and Takashi Kunugi

    Citation: Earth, Planets and Space 2019 71:120

    Content type: Comment

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    The original article was published in Earth, Planets and Space 2019 71:27

  31. The shallow accretionary prism of the Nankai Trough is a location where both large interplate earthquakes and slow earthquakes occur. Since the physical properties of sedimentary materials are important topics...

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

    Citation: Earth, Planets and Space 2019 71:116

    Content type: Full paper

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  32. We investigate S-wave attenuation (Qs) structure in and around Hokkaido, Japan, including the source area of the 2018 Hokkaido Eastern Iburi Earthquake (M 6.7) and its aftershocks. From the strong-motion seism...

    Authors: Ryoichi Nakamura and Takahiro Shiina

    Citation: Earth, Planets and Space 2019 71:114

    Content type: Express Letter

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  33. We applied tomographic inversion and receiver function analysis to seismic data from ocean-bottom seismometers and land-based stations to understand the structure and its relationship with slow slip events off...

    Authors: Aki Ito, Takashi Tonegawa, Naoki Uchida, Yojiro Yamamoto, Daisuke Suetsugu, Ryota Hino, Hiroko Sugioka, Koichiro Obana, Kazuo Nakahigashi and Masanao Shinohara

    Citation: Earth, Planets and Space 2019 71:111

    Content type: Full paper

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  34. A long linear distribution of epicenters is seen along the Japan Sea coast in the San-in district located in southwestern Japan. This linear distribution of epicenters is called the seismic belt in the San-in ...

    Authors: Hiroo Tsuda, Yoshihisa Iio and Takuo Shibutani

    Citation: Earth, Planets and Space 2019 71:109

    Content type: Express Letter

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