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  1. An S-wave reflector is considered to relate to the existence of liquid in the seismogenic zone of the crust, which plays an important role in understanding the mechanism of earthquakes. We studied a distribution ...

    Authors: Satoshi Matsumoto, Yoshihisa Iio, Takeshi Matsushima, Kenji Uehira and Takuo Shibutani
    Citation: Earth, Planets and Space 2014 57:BF03352592
    Content type: Letter Published on:

  2. We deployed 56 temporary seismic stations within approximately a month after the occurrence of the 2004 mid-Niigata prefecture earthquake. Using manually-picked arrival data obtained from the temporary and sur...

    Authors: Aitaro Kato, Shinichi Sakai, Naoshi Hirata, Eiji Kurashimo, Satoru Nagai, Takashi Iidaka, Toshihiro Igarashi, Yoshiko Yamanaka, Satoko Murotani, Tomonori Kawamura, Takaya Iwasaki and Toshihiko Kanazawa
    Citation: Earth, Planets and Space 2014 57:BF03352591
    Content type: Letter Published on:

  3. The 2004 Mid Niigata Prefecture Earthquake (Mj = 6.8) occurred on 23 October 2004 in the northeastern part of the Niigata-Kobe Tectonic Zone where large contraction rates were observed. The mainshock was follo...

    Authors: Takuo Shibutani, Yoshihisa Iio, Satoshi Matsumoto, Hiroshi Katao, Takeshi Matsushima, Shiro Ohmi, Fumiaki Takeuchi, Kenji Uehira, Kin’ya Nishigami, Bogdan Enescu, Issei Hirose, Yasuyuki Kano, Yuhki Kohno, Masahiro Korenaga, Yutaka Mamada, Masatoshi Miyazawa…
    Citation: Earth, Planets and Space 2014 57:BF03352590
    Content type: Letter Published on:

  4. Aftershock observations of the 2004 Mid Niigata Prefecture earthquake were conducted in the central part of Ojiya city, the Niigata prefecture, central Japan, to investigate local site effects. We installed ei...

    Authors: Hiroaki Yamanaka, Kentaro Motoki, Shun’ichi Fukumoto, Toshiyuki Takahashi, Nobuyuki Yamada and Kimiyuki Asano
    Citation: Earth, Planets and Space 2014 57:BF03352589
    Content type: Letter Published on:

  5. A preliminary source model composed of asperities for the 2004 Mid Niigata Prefecture, Japan, earthquake (MJMA=6.8) was estimated by the empirical Green’s function method. The source parameters for two asperities...

    Authors: K. Kamae, T. Ikeda and S. Miwa
    Citation: Earth, Planets and Space 2014 57:BF03352588
    Content type: Letter Published on:

  6. The 2004 Mid Niigata Prefecture earthquake (37.289°N, 138.870°E, 13.1 km, MJMA 6.8; JMA), also known as the 2004 Niigata Prefecture Chuetsu earthquake, was a thrust type earthquake that occurred on October 23, 20...

    Authors: R. Honda, S. Aoi, N. Morikawa, H. Sekiguchi, T. Kunugi and H. Fujiwara
    Citation: Earth, Planets and Space 2014 57:BF03352587
    Content type: Letter Published on:

  7. The 2004 Mid Niigata Prefecture earthquake sequence produced a nearly 1-km-long, N-S to NNW-SSE-striking, west-side-up surface rupture along a previously unmapped fault at Obiro, Uonuma City, eastern margin of...

    Authors: Tadashi Maruyama, Yuichiro Fusejima, Toshikazu Yoshioka, Yasuo Awata and Tabito Matsu’ura
    Citation: Earth, Planets and Space 2014 57:BF03352586
    Content type: Letter Published on:

  8. We have used Monte Carlo simulations of O+ velocity distributions in the high latitude F- region to improve the calculation of incoherent radar spectra in auroral ionosphere. The Monte Carlo simulation includes i...

    Authors: I. A. Barghouthi
    Citation: Earth, Planets and Space 2014 57:BF03352585
    Content type: Article Published on:

  9. Transient crustal deformation occurred in the regions of Kanto and Tokai during the seismo-volcanic event in the northern Izu Islands in 2000. In our investigation of the observed deformation, we constructed a...

    Authors: Akio Kobayashi, Akio Yoshida, Takeyasu Yamamoto and Hiromi Takayama
    Citation: Earth, Planets and Space 2014 57:BF03352584
    Content type: Article Published on:

  10. We have examined temporal changes in seismic velocity of the crust through repeated active seismic experiments at Iwate volcano, Japan, where a significant volcanic activity and an M6.1 earthquake were observe...

    Authors: Takeshi Nishimura, Satoru Tanaka, Teruo Yamawaki, Hidekazu Yamamoto, Takashi Sano, Minemori Sato, Hisashi Nakahara, Naoki Uchida, Shuichiro Hori and Haruo Sato
    Citation: Earth, Planets and Space 2014 57:BF03352583
    Content type: Article Published on:

  17. We estimated the source model for the foreshock of the 2004 off the Kii peninsula earthquakes by empirical Green’s function modeling. The size and the rise time of the strong motion generation area (SMGA) were...

    Authors: Wataru Suzuki, Tomotaka Iwata, Kimiyuki Asano and Nobuyuki Yamada
    Citation: Earth, Planets and Space 2014 57:BF03352574
    Content type: Letter Published on:

  18. We made a close investigation about the initial rising slopes of the envelope waveforms of the P-wave ground motion by using data for recent earthquakes. We have found that the P-wave initial slopes decrease almo...

    Authors: Toshikazu Odaka, Hiromitsu Nakamura and Kimitoshi Ashiya
    Citation: Earth, Planets and Space 2014 57:BF03352572
    Content type: Letter Published on:

  19. Anomalous seismic events were observed after the occurrence of the foreshock (Mw=7.2) and the main shock (Mw=7.5) of the 2004 off the Kii peninsula earthquakes. These anomalous events are characterized by very...

    Authors: Kazushige Obara and Yoshihiro Ito
    Citation: Earth, Planets and Space 2014 57:BF03352570
    Content type: Letter Published on:

  20. The 2004 off the Kii peninsula earthquakes (Mj7.1 and Mj7.4) occurred at the Nankai trough, on 5 September 2004. Clear strain-steps associated with these earthquakes were observed with Ishii-type borehole stra...

    Authors: Yasuhiro Asai, Makoto Okubo, Hiroshi Ishii, Harumi Aoki, Tsuneo Yamauchi, Yuuichi Kitagawa and Naoji Koizumi
    Citation: Earth, Planets and Space 2014 57:BF03352568
    Content type: Letter Published on:

  21. A tsunami due to the 2004 M7.4 September 5th earthquake off of the Kii peninsula, Japan, was recorded at the GPS buoy newly designed and established in April 2004, about 13 km off of the Muroto Promontory, sou...

    Authors: Teruyuki Kato, Yukihiro Terada, Keiji Ito, Ryuji Hattori, Takenori Abe, Toshihide Miyake, Shun’ichi Koshimura and Toshihiko Nagai
    Citation: Earth, Planets and Space 2014 57:BF03352566
    Content type: Letter Published on:

  22. The effects of satellite ground track changes of GRACE on monthly gravity field recoveries are investigated. In the case of a gravity field recovery using a relatively short period of a month or so, the variat...

    Authors: Keiko Yamamoto, Toshimichi Otsubo, Toshihiro Kubo-oka and Yoichi Fukuda
    Citation: Earth, Planets and Space 2014 57:BF03352565
    Content type: Letter Published on:

  24. The results of GPS positioning depend on both functional and stochastic models. In most of the current GPS processing programs, however, the stochastic model that describes the statistical properties of GPS ob...

    Authors: Shuanggen Jin, J. Wang and Pil-Ho Park
    Citation: Earth, Planets and Space 2014 57:BF03352561
    Content type: Article Published on:

  25. We present preliminary results of an electromagnetic survey over a region of hydrothermal circulation in the spreading axis of the central Mariana Trough. The Magnetometric Resistivity (MMR) method is used to ...

    Authors: Noriko Tada, Nobukazu Seama, Tada-nori Goto and Motoyuki Kido
    Citation: Earth, Planets and Space 2014 57:BF03351846
    Content type: Letter Published on:

  26. Landform and damage classification surveys have been conducted on six colonies worst-hit by the 2004 mid-Niigata prefecture earthquake. The landform was classified using aerial photographs taken by the US Air ...

    Authors: Masayuki Yoshimi, Taku Komatsubara, Yoshinori Miyachi, Katsumi Kimura, Haruko Sekiguchi, Masayuki Saeki, Sunao Kunimatsu, Kunikazu Yoshida, Masanori Ozaki, Tsutomu Nakazawa, Rei Nakashima and Hidetaka Saomoto
    Citation: Earth, Planets and Space 2014 57:BF03351845
    Content type: Letter Published on:

  27. To investigate the postseismic crustal deformation associated with the 2004 mid-Niigata prefecture earthquake (M6.8), we newly started GPS observation to fill a gap of the nationwide continuous GPS network. Ou...

    Authors: Hiroaki Takahashi, Takeshi Matsushima, Teruyuki Kato, Akira Takeuchi, Teruhiro Yamaguchi, Yuhki Kohno, Takeshi Katagi, Jun’ichi Fukuda, Kazuya Hatamoto, Ryousuke Doke, Yuki Matsu’ura and Minoru Kasahara
    Citation: Earth, Planets and Space 2014 57:BF03351844
    Content type: Letter Published on:

  28. Variations of cold plasma density distribution and large-scale electric field in the inner magnetosphere and plasmasphere during a geomagnetic storm were investigated by using the observation data of the Akebo...

    Authors: A. Shinbori, Y. Nishimura, T. Ono, A. Kumamoto and H. Oya
    Citation: Earth, Planets and Space 2014 57:BF03351843
    Content type: Article Published on:

  29. Dependence of the location of the cusp precipitation on the orientation of interplanetary magnetic field (IMF) is investigated using data from the Akebono satellite taken at altitudes of several thousands of k...

    Authors: Keiko T. Asai, Kiyoshi Maezawa, Toshifumi Mukai and Hajime Hayakawa
    Citation: Earth, Planets and Space 2014 57:BF03351842
    Content type: Article Published on:

  32. It is proposed that the Beppu-Shimabara graben (BSG), characterized by the continuous negative Bouguer anomaly, runs NE to SW in central Kyushu. In order to clarify the BSG, the shallow electrical conductivity...

    Authors: Shun Handa
    Citation: Earth, Planets and Space 2014 57:BF03351839
    Content type: Article Published on:

  34. Deep-tow vector magnetic data have been acquired across the fast-spreading southern East Pacific Rise 18°S and inverted to magnetization intensity variations. Vector magnetic data are used to determine continu...

    Authors: Michiko Yamamoto, Nobukazu Seama and Nobuhiro Isezaki
    Citation: Earth, Planets and Space 2014 57:BF03351835
    Content type: Letter Published on:

  35. We present a novel mechanical model for the extraction of outer core material upwards across the CMB into the mantle side region of D” and subsequent interaction with the post-perovskite (ppv) phase transition...

    Authors: Nick Petford, Dave Yuen, Tracy Rushmer, John Brodholt and Stephen Stackhouse
    Citation: Earth, Planets and Space 2014 57:BF03351834
    Content type: Letter Published on:

  36. The geologic structure of the Uonuma Hills, the site of the 2004 Mid-Niigata Prefecture Earthquake (MJMA 6.8), Japan, is examined based on published geologic maps, drill hole data and seismic reflection profiles....

    Authors: Hiroshi Sato and Naoko Kato
    Citation: Earth, Planets and Space 2014 57:BF03351833
    Content type: Letter Published on:

  37. The Mid-Niigata Prefecture earthquake in 2004 (MJMA 6.8) generated surface ruptures along the eastern rim of the Uonuma Hills. To elucidate the structural linkage between the surface ruptures and the source fault...

    Authors: Naoko Kato, Tomoo Echigo, Hiroshi Sato, Masaaki Tateishi, Sumiko Ogino, Shin’ichi Sakai, Shigeru Toda, Shin Koshiya, Tanio Ito, Tsuyoshi Toyoshima, Toshifumi Imaizumi, Hajime Kato and Shintaro Abe
    Citation: Earth, Planets and Space 2014 57:BF03351832
    Content type: Letter Published on:

  38. Across the source region of the 2004 Mid-Niigata Prefecture earthquake, wideband magnetotelluric (MT) survey was performed just after the onset of the mainshock. Owing to the temporal stop of the DC powered ra...

    Authors: Makoto Uyeshima, Yasuo Ogawa, Yoshimori Honkura, Shigeru Koyama, Naoto Ujihara, Toru Mogi, Yusuke Yamaya, Makoto Harada, Satoru Yamaguchi, Ichiro Shiozaki, Tatsuya Noguchi, Yoshihiro Kuwaba, Yoshikazu Tanaka, Yuji Mochido, Noriko Manabe, Masanori Nishihara…
    Citation: Earth, Planets and Space 2014 57:BF03351831
    Content type: Letter Published on:

  39. A destructive large earthquake (the 2004 mid Niigata prefecture earthquake) sequence occurred in the central part (Chuetsu district) of Niigata prefecture, central Japan on October 23, 2004. We have deployed a...

    Authors: T. Okada, N. Umino, T. Matsuzawa, J. Nakajima, N. Uchida, T. Nakayama, S. Hirahara, T. Sato, S. Hori, T. Kono, Y. Yabe, K. Ariyoshi, S. Gamage, J. Shimizu, J. Suganomata, S. Kita…
    Citation: Earth, Planets and Space 2014 57:BF03351830
    Content type: Letter Published on:

  40. The 2004 mid Niigata prefecture earthquake with M6.8 occurred in the north of central part of Japan. It was a reverse fault by the regional compression stress field in NW-SE direction. Several aftershocks with...

    Authors: Masahiro Korenaga, Satoshi Matsumoto, Yoshihisa Iio, Takeshi Matsushima, Kenji Uehira and Takuo Shibutani
    Citation: Earth, Planets and Space 2014 57:BF03351829
    Content type: Letter Published on:

  41. Crustal deformation associated with the Mid Niigata prefecture Earthquake in 2004 (MJMA = 6.8) was detected using RADARSAT SAR interferometry. A displacement of −40 cm in the line-of-sight to the satellite was ob...

    Authors: Taku Ozawa, Sou Nishimura, Yutaka Wada and Hiroshi Ohkura
    Citation: Earth, Planets and Space 2014 57:BF03351828
    Content type: Letter Published on:

  42. A seismic network was deployed the day after the main shock of the 2004 Mid-Niigata Prefecture Earthquake to determine the major source faults responsible for the main shock and large aftershocks. Using the hi...

    Authors: Shin’ichi Sakai, Naoshi Hirata, Aitaro Kato, Eiji Kurashimo, Takaya Iwasaki and Toshihiko Kanazawa
    Citation: Earth, Planets and Space 2014 57:BF03351827
    Content type: Letter Published on:

  43. A shallow destructive inland earthquake of M6.8 occurred on Oct. 23, 2004 (JST) in the middle part of Niigata prefecture, Japan. The aftershock activity was high as compared to those of the other shallow inlan...

    Authors: Shigeki Aoki, Masaki Nishi, Koji Nakamura, Tetsuo Hashimoto, Sumio Yoshikawa and Hidemi M. Ito
    Citation: Earth, Planets and Space 2014 57:BF03351826
    Content type: Letter Published on:

  44. Using seismograms recorded at 582 Hi-net stations for earthquakes located within 30 km from each station, we measured coda Q for frequency bands of 1–2, 2–4, 4–8, 8–16, and 16–32 Hz, respectively. Then coda Q map...

    Authors: Anshu Jin and Keiiti Aki
    Citation: Earth, Planets and Space 2014 57:BF03351825
    Content type: Research News Published on:

  45. The formation of Al2O3 phases by the solid-solid reaction of a metallic Al layer evaporated on a SiO2 amorphous grain has been induced by heating above 600°C in vacuum (1×10−6 Pa). The distortion process of the a...

    Authors: S. Sasaki, H. Suzuki, Y. Kimura, T. Sato, T. Tanigaki, O. Kido, K. Kamitsuji, M. Kurumada and C. Kaito
    Citation: Earth, Planets and Space 2014 57:BF03351824
    Content type: Research News Published on:

  46. Winds measured by an all-sky meteor radar have been used to investigate the terdiurnal tide in the mesosphere and lower thermosphere (MLT) region overWuhan (30.6°N, 114.4°E). We present a climatology of the te...

    Authors: Guangxin Zhao, Libo Liu, Baiqi Ning, Weixing Wan and Jiangang Xiong
    Citation: Earth, Planets and Space 2014 57:BF03351823
    Content type: Research News Published on:

  47. We compare, for the first time, geomagnetically-conjugate plasma bubbles observed by ground-based OI 630.0-nm all-sky imagers at Shigaraki, Japan (34.8°N, 136.1°E; magnetic latitude 25.4°N) and Darwin, Austral...

    Authors: Tadahiko Ogawa, Eiichi Sagawa, Yuichi Otsuka, Kazuo Shiokawa, Thomas I. Immel, Stephen B. Mende and Phil Wilkinson
    Citation: Earth, Planets and Space 2014 57:BF03351822
    Content type: Research News Published on:

  48. We examined the thermal structure of the crust across complex deformation zones in SW Turkey using the Curie Point Depth (CPD) estimates and made comparisons of the thermal state of the crust with the seismic ...

    Authors: M. Nuri Dolmaz, Timur Ustaömer, Z. Mumtaz Hisarli and Naci Orbay
    Citation: Earth, Planets and Space 2014 57:BF03351821
    Content type: Research News Published on:
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