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4. Seismology

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  1. 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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  2. 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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  3. 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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  4. 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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  5. To improve our understanding of the long-term behavior of low-frequency earthquakes (LFEs) along the tremor belt of the Nankai subduction zone, we applied a matched filter technique to continuous seismic data ...

    Authors: Aitaro Kato and Shigeki Nakagawa

    Citation: Earth, Planets and Space 2020 72:128

    Content type: Express Letter

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  6. National Research Institute for Earth Science and Disaster Resilience (NIED) integrated the land observation networks established since the 1995 Kobe earthquake with the seafloor observation networks establish...

    Authors: Shin Aoi, Youichi Asano, Takashi Kunugi, Takeshi Kimura, Kenji Uehira, Narumi Takahashi, Hideki Ueda, Katsuhiko Shiomi, Takumi Matsumoto and Hiroyuki Fujiwara

    Citation: Earth, Planets and Space 2020 72:126

    Content type: Frontier letter

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  7. We analyze the regional tsunami hazard along the Sea of Japan coast associated with 60 active faults beneath the eastern margin of the Sea of Japan. We generate stochastic slip distribution using a Monte Carlo...

    Authors: Iyan E. Mulia, Takeo Ishibe, Kenji Satake, Aditya Riadi Gusman and Satoko Murotani

    Citation: Earth, Planets and Space 2020 72:123

    Content type: Full paper

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  8. Although fluid behavior along faults has often been associated with earthquakes and hydrocarbon accumulation, few observations of active, ongoing fluid discharge along the faults exist. We conducted a dense-2D...

    Authors: Tetsuro Tsuru, Jin-Oh Park, Kazuo Amakasu, Tetsuo No, Kohsaku Arai, Takahiko Inoue, Seishiro Furuyama, Keiichi Uchida and Yasuyuki Nakamura

    Citation: Earth, Planets and Space 2020 72:121

    Content type: Full paper

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  9. Interferograms pertaining to large earthquakes typically reveal the occurrence of elastic deformations caused by the earthquake along with several complex surface displacements. In this study, we identified di...

    Authors: Satoshi Fujiwara, Takayuki Nakano and Yu Morishita

    Citation: Earth, Planets and Space 2020 72:119

    Content type: Frontier letter

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  10. We determined focal mechanism solutions of microearthquakes and examined the stress field in the low-seismicity region from southern Hokkaido to eastern Aomori, NE Japan. The stress fields determined in this s...

    Authors: Sumire Maeda, Toru Matsuzawa, Tomomi Okada, Hiroshi Katao, Takeyoshi Yoshida, Masahiro Kosuga and Makoto Otsubo

    Citation: Earth, Planets and Space 2020 72:117

    Content type: Express Letter

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  11. Deep-sea turbidites have been utilized to understand the history of past large earthquakes. Surface-sediment remobilization is considered to be a mechanism for the initiation of earthquake-induced turbidity cu...

    Authors: Ken Ikehara, Kazuko Usami and Toshiya Kanamatsu

    Citation: Earth, Planets and Space 2020 72:114

    Content type: Full paper

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  12. Several laboratory experimental studies of photoemission characteristics of rocks as they fracture have been conducted to elucidate the mechanism of earthquake lightning (EQL). In most of these studies, granit...

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

    Citation: Earth, Planets and Space 2020 72:108

    Content type: Express Letter

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  13. 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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  14. 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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  15. 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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  16. 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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  17. 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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  18. 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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  19. 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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  20. 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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  21. 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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  22. 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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  23. 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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  24. 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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  25. 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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  26. 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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  27. 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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  28. 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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  29. 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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  30. 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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  31. 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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  32. 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

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