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4. Seismology

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  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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

    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

  10. 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

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

  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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

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

  17. 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
  18. 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

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

  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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

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

  26. 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
  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. 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
  34. 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
  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
  36. 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
  37. 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
  38. 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
  39. 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

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