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4. Seismology

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  1. Gravity gradient tensor analysis has been a powerful tool for investigating subsurface structures and recently its application to a two-dimensional fault structure has been developed. To elucidate the faulting...

    Authors: Yoshihiro Hiramatsu, Akihiro Sawada, Wataru Kobayashi, Satoshi Ishida and Masaaki Hamada
    Citation: Earth, Planets and Space 2019 71:107
    Content type: Express Letter Published on:

  2. The 2011 Tohoku-Oki offshore subduction earthquake (Mw 9.0) triggered many normal-type earthquakes inland in northeastern Japan. Among these were two very similar normal-faulting earthquakes in 2011 (Mw 5.8) and ...

    Authors: Keitaro Komura, Kotaro Aiyama, Takahiro Nagata, Hiroshi P. Sato, Akihiro Yamada and Yasuhira Aoyagi
    Citation: Earth, Planets and Space 2019 71:106
    Content type: Full paper Published on:

  3. Oblique convergent margins often host forearc slivers separated by the subduction interface and a trench parallel strike-slip fault system in the overriding plate. Mexican oblique subduction setting led to the...

    Authors: Ekaterina Kazachkina, Vladimir Kostoglodov, Allen Husker and Nathalie Cotte
    Citation: Earth, Planets and Space 2019 71:104
    Content type: Full paper Published on:

  4. The Hokkaido Eastern Iburi Earthquake (M = 6.7) occurred on Sep. 6, 2018 in the southern part of Central Hokkaido, Japan. Since Paleogene, this region has experienced the dextral oblique transpression between the...

    Authors: Takaya Iwasaki, Noriko Tsumura, Tanio Ito, Kazunori Arita, Matsubara Makoto, Hiroshi Sato, Eiji Kurashimo, Naoshi Hirata, Susumu Abe, Katsuya Noda, Akira Fujiwara, Shinsuke Kikuchi and Kazuko Suzuki
    Citation: Earth, Planets and Space 2019 71:103
    Content type: Frontier letter Published on:

    The Correction to this article has been published in Earth, Planets and Space 2020 72:39

  5. The source rupture process of the 2018 Hokkaido Eastern Iburi earthquake (MJMA 6.7) was analyzed by a kinematic waveform inversion method using strong-motion data in 0.04–0.5 Hz. This earthquake occurred close to...

    Authors: Kimiyuki Asano and Tomotaka Iwata
    Citation: Earth, Planets and Space 2019 71:101
    Content type: Full paper Published on:

  6. 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 2019 71:98
    Content type: Express Letter Published on:

    The Retraction Note to this article has been published in Earth, Planets and Space 2019 71:142

  7. The Ontong Java Plateau (OJP) in the southwest Pacific is the largest oceanic large igneous provinces (LIP) on Earth. Detailed seismic structure of the plateau has not been understood well because of sparse se...

    Authors: Daisuke Suetsugu, Hajime Shiobara, Hiroko Sugioka, Aki Ito, Takehi Isse, Yasushi Ishihara, Satoru Tanaka, Masayuki Obayashi, Takashi Tonegawa, Junko Yoshimitsu and Takumi Kobayashi
    Citation: Earth, Planets and Space 2019 71:97
    Content type: Express Letter Published on:

  9. In this study, we investigated the influence of local structural heterogeneities on aftershocks of the 2008 Iwate–Miyagi Nairiku earthquake (M 7.2) that occurred in the northeastern Japan arc. Although this ar...

    Authors: Sumire Maeda, Toru Matsuzawa, Keisuke Yoshida, Tomomi Okada and Takeyoshi Yoshida
    Citation: Earth, Planets and Space 2019 71:94
    Content type: Full paper Published on:

  10. The 2016 Kumamoto earthquake (Mw 7.0) caused hot springs in the Uchinomaki area of Aso caldera to become dormant. Geodetic and borehole observations have previously demonstrated that the area around the hot sp...

    Authors: Kosuke Takahashi, Takeshi Tsuji, Tatsunori Ikeda, Hiro Nimiya, Yuichiro Nagata and Yudai Suemoto
    Citation: Earth, Planets and Space 2019 71:87
    Content type: Express Letter Published on:

  13. We present the spatiotemporal evolution of the Boso slow slip event with a moment of 20 × 1018 N m that occurred in June 2018; such events, which have a duration of 1–2 weeks, have repeatedly occurred off the Bos...

    Authors: Shinzaburo Ozawa, Hiroshi Yarai and Tomokazu Kobayashi
    Citation: Earth, Planets and Space 2019 71:78
    Content type: Express Letter Published on:

  14. Autocorrelation analysis using ambient noise is a useful method to detect temporal changes in wave velocity and scattering property. In this study, we investigated the temporal changes in seismic wave velocity...

    Authors: Hiroki Ikeda and Ryota Takagi
    Citation: Earth, Planets and Space 2019 71:72
    Content type: Full paper Published on:

  15. The eastern North American rifted margin is a passive tectonic margin that has experienced Paleozoic ocean closure and Mesozoic continent rifting. To understand evolution of this continental margin, we modeled...

    Authors: Wenbin Guo, Shuai Zhao, Fuyun Wang, Zhuoxin Yang, Shixu Jia and Zhi Liu
    Citation: Earth, Planets and Space 2019 71:69
    Content type: Full paper Published on:

  16. We investigated the cause of destructive ground motion during the 2018 Hokkaido eastern Iburi earthquake. We conducted strong motion observations of aftershocks and microtremors and the surface wave method in ...

    Authors: Nobuo Takai, Michiko Shigefuji, Jun Horita, Shingo Nomoto, Takahiro Maeda, Masayoshi Ichiyanagi, Hiroaki Takahashi, Hiroaki Yamanaka, Kosuke Chimoto, Seiji Tsuno, Masahiro Korenaga and Nobuyuki Yamada
    Citation: Earth, Planets and Space 2019 71:67
    Content type: Full paper Published on:

  17. The 2018 Hokkaido Iburi-Tobu earthquake occurred on September 6. In this earthquake, seismic intensity 7 was measured at Shikanuma, Atsuma Town, and severe damage occurred in Hokkaido. The strong motions were ...

    Authors: Kenichi Nakano and Hiroshi Kawase
    Citation: Earth, Planets and Space 2019 71:66
    Content type: Express Letter Published on:

  18. We identified and analyzed surface displacements associated with the 2018 Hokkaido Eastern Iburi Earthquake in northern Japan using satellite radar interferograms from the Advanced Land Observing Satellite 2. ...

    Authors: Satoshi Fujiwara, Takayuki Nakano, Yu Morishita, Tomokazu Kobayashi, Hiroshi Yarai, Hiroshi Une and Kyonosuke Hayashi
    Citation: Earth, Planets and Space 2019 71:64
    Content type: Full paper Published on:

  19. The source rupture process of the 2018 Hokkaido Eastern Iburi earthquake was investigated by performing a joint inversion analysis using the strong motion and geodetic data. A fault model that consists of two ...

    Authors: Hiroaki Kobayashi, Kazuki Koketsu and Hiroe Miyake
    Citation: Earth, Planets and Space 2019 71:63
    Content type: Full paper Published on:

  20. By applying the InSAR method to ALOS-2 SAR data acquired before and after the 2018 Hokkaido Eastern Iburi earthquake, the ground displacement fields were successfully mapped. Ground deformation is distributed ...

    Authors: Tomokazu Kobayashi, Kyonosuke Hayashi and Hiroshi Yarai
    Citation: Earth, Planets and Space 2019 71:62
    Content type: Express Letter Published on:

  23. The 2018 Mj 6.7 Hokkaido Eastern Iburi earthquake (Iburi earthquake) occurred near the eastern boundary fault zone of the Ishikari lowlands, which is composed of a northern and southern fault. Aftershock distribu...

    Authors: Makiko Ohtani and Kazutoshi Imanishi
    Citation: Earth, Planets and Space 2019 71:57
    Content type: Full paper Published on:

  24. The observed peak ground accelerations and peak ground velocities (PGVs) of the 2018 Mw 6.6 Hokkaido eastern Iburi earthquake generally followed the median values from ground motion prediction equations with r...

    Authors: Yadab P. Dhakal, Takashi Kunugi, Takeshi Kimura, Wataru Suzuki and Shin Aoi
    Citation: Earth, Planets and Space 2019 71:56
    Content type: Full paper Published on:

  26. Tsunami deposits were collected along the coast of southwestern Hokkaido and Okushiri Island, northern Japan. The distribution of these deposits suggested that large earthquakes and tsunamis have repeatedly oc...

    Authors: Kei Ioki, Yuichiro Tanioka, Gentaro Kawakami, Yoshihiro Kase, Kenji Nishina, Wataru Hirose, Kei’ichi Hayashi and Ryo Takahashi
    Citation: Earth, Planets and Space 2019 71:54
    Content type: Full paper Published on:

  27. The Hokkaido Eastern Iburi earthquake (MJMA = 6.7) occurred on September 6, 2018, in the Hokkaido corner region where the Kurile and northeastern Japan island arcs meet. We relocated aftershocks of this intraplat...

    Authors: 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, Shuichiro Hirano, Toshiko Terakawa, Shinichiro Horikawa…
    Citation: Earth, Planets and Space 2019 71:53
    Content type: Express Letter Published on:

  28. A recent work by Kimura et al. (Earth Planets Space 71:27, 2019. https://​doi.​org/​10.​1186/​s40623-019-1006-x) (hereafter referred to as K19) claims to provide the fi...

    Authors: Martin Vallée, Jean Paul Ampuero, Kévin Juhel, Pascal Bernard, Jean-Paul Montagner and Matteo Barsuglia
    Citation: Earth, Planets and Space 2019 71:51
    Content type: Comment Published on:

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

    The Comment to this article has been published in Earth, Planets and Space 2019 71:120

  29. We develop a modified envelope correlation method for locating deep tectonic tremors and apply it to construct a tremor catalog for western Japan. We redefine the envelope cross-correlation method as a maximum...

    Authors: Naoto Mizuno and Satoshi Ide
    Citation: Earth, Planets and Space 2019 71:40
    Content type: Full paper Published on:

  30. On June 18, 2018, an MJMA6.1 inland crustal earthquake occurred on the northeast edge of the Osaka basin, Japan. This event impacted the region by the maximum PGA larger than 0.9 g, and it was followed by a serie...

    Authors: Miroslav Hallo, Ivo Opršal, Kimiyuki Asano and František Gallovič
    Citation: Earth, Planets and Space 2019 71:34
    Content type: Full paper Published on:

  31. Owing to the strict restrictions on the use of air guns in marine seismic surveys due to concerns about their potential impact on the marine ecosystem, there have been several cases where seismic surveys were ...

    Authors: Tetsuro Tsuru, Kazuo Amakasu, Jin-Oh Park, Junichi Sakakibara and Mamoru Takanashi
    Citation: Earth, Planets and Space 2019 71:31
    Content type: Express Letter Published on:

  32. We have analyzed the temporal variation in coda Q in the northeastern part of an inland high strain rate zone, the Niigata–Kobe Tectonic Zone (NKTZ), in central Japan, to investigate the response of coda Q to the...

    Authors: Masanobu Dojo and Yoshihiro Hiramatsu
    Citation: Earth, Planets and Space 2019 71:32
    Content type: Full paper Published on:

  33. The Mw 6.9 earthquake off Fukushima Prefecture, Japan, of 22 November 2016 was followed by a tsunami that struck the Japanese coast from Hokkaido in northern Japan to Wakayama Prefecture in western Japan. We comp...

    Authors: Kenji Nakata, Yutaka Hayashi, Hiroaki Tsushima, Kenichi Fujita, Yasuhiro Yoshida and Akio Katsumata
    Citation: Earth, Planets and Space 2019 71:30
    Content type: Full paper Published on:

  34. Around the Ogasawara Islands, only a few seismic stations in the area can be used to determine the hypocenters of regional earthquakes; thus, hypocenter location precision tends to be low. To more precisely de...

    Authors: Kenji Nakata, Akio Kobayashi, Akio Katsumata, Fuyuki Hirose, Takahito Nishimiya, Kazuhiro Kimura, Hiroaki Tsushima, Kenji Maeda, Hisatoshi Baba, Noritaka Hanamura, Chisato Yamada and Masashi Kanezashi
    Citation: Earth, Planets and Space 2019 71:29
    Content type: Full paper Published on:

  35. Earthquake ruptures cause mass redistribution, which is expected to induce transient gravity perturbations simultaneously at all distances from the source before the arrival of P-waves. A recent research paper...

    Authors: Masaya Kimura, Nobuki Kame, Shingo Watada, Makiko Ohtani, Akito Araya, Yuichi Imanishi, Masaki Ando and Takashi Kunugi
    Citation: Earth, Planets and Space 2019 71:27
    Content type: Full paper Published on:

    The Comment to this article has been published in Earth, Planets and Space 2019 71:51

    The Comment to this article has been published in Earth, Planets and Space 2019 71:120

  36. The Okinawa Trough, to the southwest of Kyusyu, Japan, is an active backarc basin of the Ryukyu (Nansei-Shoto) island arc–trench system caused by the Philippine Sea plate subduction. Unlike other backarc basin...

    Authors: Azusa Nishizawa, Kentaro Kaneda, Mitsuhiro Oikawa, Daishi Horiuchi, Yukari Fujioka and Chiaki Okada
    Citation: Earth, Planets and Space 2019 71:21
    Content type: Full paper Published on:

  39. We analyzed strong-motion and broadband recordings of two moderate-magnitude earthquakes that occurred in the Nankai Trough. The first event was the 2004 Mw 6.5 southeast off-Kii peninsula earthquake, an after...

    Authors: Yadab P. Dhakal, Wataru Suzuki, Takeshi Kimura, Nobuyuki Morikawa, Takashi Kunugi and Shin Aoi
    Citation: Earth, Planets and Space 2018 70:189
    Content type: Full paper Published on:

  41. The effects of the short-wavelength heterogeneity of the crustal structure on predicted ground motion at periods of 1 s and longer were investigated by conducting three-dimensional finite-difference simulation...

    Authors: Asako Iwaki, Takahiro Maeda, Nobuyuki Morikawa, Shunsuke Takemura and Hiroyuki Fujiwara
    Citation: Earth, Planets and Space 2018 70:156
    Content type: Full paper Published on:

  43. We conducted high-resolution reflection analysis of data from 168 seismic stations with an average spacing of about 5 km, in northern Kinki district, southwestern Japan. Reflection analysis has previously been...

    Authors: Shinya Katoh, Yoshihisa Iio, Hiroshi Katao, Masayo Sawada, Kazuhide Tomisaka, Tsutomu Miura and Itaru Yoneda
    Citation: Earth, Planets and Space 2018 70:149
    Content type: Express Letter Published on:

  44. We discovered a secular change in the travel time of direct S-waves over a 10-year observation period by means of continuous operation of an artificial and stable seismic source, called Accurately Controlled R...

    Authors: Shuhei Tsuji, Koshun Yamaoka, Ryoya Ikuta, Takahiro Kunitomo, Toshiki Watanabe, Yasuhiro Yoshida and Akio Katsumata
    Citation: Earth, Planets and Space 2018 70:146
    Content type: Express Letter Published on:

  46. In contrast to surface observation of complex earthquake faults, simple fault-plane models are frequently sufficient to fit geophysical data of seismic wave or crustal deformation. However, earthquake occurren...

    Authors: Yuta Mitsui
    Citation: Earth, Planets and Space 2018 70:136
    Content type: Full paper Published on:
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