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4. Seismology

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  1. Content type: Full paper

    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

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  2. Content type: Express Letter

    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

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  3. Content type: Full paper

    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

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  4. Content type: Full paper

    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

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  5. Content type: Express Letter

    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

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  6. Content type: Full paper

    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

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  7. Content type: Full paper

    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

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  8. Content type: Full paper

    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

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  9. Content type: Express Letter

    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

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  10. Content type: Comment

    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 ...

    Authors: Martin Vallée, Jean Paul Ampuero, Kévin Juhel, Pascal Bernard, Jean-Paul Montagner and Matteo Barsuglia

    Citation: Earth, Planets and Space 2019 71:51

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  11. Content type: Full paper

    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

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  12. Content type: Full paper

    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

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  13. Content type: Express Letter

    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

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  14. Content type: Full paper

    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

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  15. Content type: Full paper

    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

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  16. Content type: Full paper

    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

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  17. Content type: Full paper

    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

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  18. Content type: Full paper

    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

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  19. Content type: Full paper

    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

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  20. Content type: Full paper

    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

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  21. Content type: Express Letter

    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

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  22. Content type: Express Letter

    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

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  23. Content type: Full paper

    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

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  24. Content type: Full paper

    Seismic refraction and multi-channel seismic reflection surveys were conducted on the northeastern Hawaiian Arch to examine the effect of hotspot volcanism on the seismic structure of the crust and uppermost m...

    Authors: Akane Ohira, Shuichi Kodaira, Gregory F. Moore, Mikiya Yamashita, Toshiya Fujiwara, Yuka Kaiho, Seiichi Miura and Gou Fujie

    Citation: Earth, Planets and Space 2018 70:121

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  25. Content type: Full paper

    In order to investigate the seismic velocity structure in the region of concentrated severe damage during the 2016 Kumamoto earthquake sequence, we conducted continuous seismic observations in the central area...

    Authors: Takumi Hayashida, Masumi Yamada, Masayuki Yamada, Koji Hada, Jim Mori, Yoshinori Fujino, Hiromu Sakaue, Sosuke Fukatsu, Eiko Nishihara, Toru Ouchi and Akio Fujii

    Citation: Earth, Planets and Space 2018 70:116

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  26. Content type: Frontier letter

    The uppermost structures of incoming oceanic plates have been investigated by seismic exploration surveys, primarily based on two-dimensional profiles. However, their regional-scale lateral variations and shea...

    Authors: Takashi Tonegawa, Koichiro Obana, Gou Fujie and Shuichi Kodaira

    Citation: Earth, Planets and Space 2018 70:106

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  27. Content type: Full paper

    The data provided by ten DONET deep-sea observatories, that on March 11, 2011, registered the Great East Japan Earthquake and tsunami, were used for investigation of the relationship between variations of the ...

    Authors: Mikhail Nosov, Viacheslav Karpov, Sergey Kolesov, Kirill Sementsov, Hiroyuki Matsumoto and Yoshiyuki Kaneda

    Citation: Earth, Planets and Space 2018 70:100

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  28. Content type: Express Letter

    Seismic wave propagation from shallow subduction-zone earthquakes can be strongly affected by 3D heterogeneous structures, such as oceanic water and sedimentary layers with irregular thicknesses. Synthetic wav...

    Authors: Taro Okamoto, Hiroshi Takenaka and Takeshi Nakamura

    Citation: Earth, Planets and Space 2018 70:98

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  29. Content type: Full paper

    Because the maximum temperature reached in the slip zone is significant information for understanding slip behaviors during an earthquake, the maturity of carbonaceous material (CM) is widely used as a proxy f...

    Authors: Shunya Kaneki and Tetsuro Hirono

    Citation: Earth, Planets and Space 2018 70:92

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  30. Content type: Full paper

    Tectonic and volcanic structures of the northern Ryukyu arc are investigated on the basis of multichannel seismic (MCS) reflection data. The study area forms an active volcanic front in parallel to the non-vol...

    Authors: Ryuta Arai, Shuichi Kodaira, Tsutomu Takahashi, Seiichi Miura and Yoshiyuki Kaneda

    Citation: Earth, Planets and Space 2018 70:61

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  31. Content type: Full paper

    Spatial and temporal variations in inland crustal stress prior to the 2011 Mw 9.0 Tohoku earthquake are investigated using focal mechanism solutions for shallow seismicity in Iwaki City, Japan. The multiple in...

    Authors: Makoto Otsubo, Ayumu Miyakawa and Kazutoshi Imanishi

    Citation: Earth, Planets and Space 2018 70:51

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  32. Content type: Full paper

    The southeast offshore Mie earthquake occurred on April 1, 2016 near the rupture area of the 1944 Tonankai earthquake, where seismicity around the interface of the Philippine Sea plate had been very low until ...

    Authors: Shunsuke Takemura, Takeshi Kimura, Tatsuhiko Saito, Hisahiko Kubo and Katsuhiko Shiomi

    Citation: Earth, Planets and Space 2018 70:50

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  33. Content type: Full paper

    Understanding variations of slip distance along major thrust systems at convergent margins is an important issue for evaluation of near-trench slip and the potential generation of large tsunamis. We derived qu...

    Authors: Hideki Mukoyoshi, Shunya Kaneki and Tetsuro Hirono

    Citation: Earth, Planets and Space 2018 70:36

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