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  1. Full paper

    Paleomagnetic direction and paleointensity variations during the Matuyama–Brunhes polarity transition from a marine succession in the Chiba composite section of the Boso Peninsula, central Japan

    The youngest geomagnetic polarity reversal, the Matuyama–Brunhes (M–B) boundary, provides an important plane of data for sediments, ice cores, and lavas. The geomagnetic field intensity and directional changes...

    Makoto Okada, Yusuke Suganuma, Yuki Haneda and Osamu Kazaoka

    Earth, Planets and Space 2017 69:45

    Published on: 21 March 2017

  2. Full paper

    Permeability-control on volcanic hydrothermal system: case study for Mt. Tokachidake, Japan, based on numerical simulation and field observation

    We investigate a volcanic hydrothermal system by using numerical simulation with three key observables as reference: the magnetic total field, vent temperature, and heat flux. We model the shallow hydrothermal...

    Ryo Tanaka, Takeshi Hashimoto, Nobuo Matsushima and Tsuneo Ishido

    Earth, Planets and Space 2017 69:39

    Published on: 8 March 2017

  3. Letter

    Local site effects in Kumamoto City revealed by the 2016 Kumamoto earthquake

    To evaluate local site effects in Kumamoto City, we installed six temporary seismic stations along a 6-km north–south survey line in the city immediately after the 2016 Kumamoto earthquake foreshock (Mj 6.4),...

    Seiji Tsuno, Masahiro Korenaga, Kyosuke Okamoto, Hiroaki Yamanaka, Kosuke Chimoto and Takeshi Matsushima

    Earth, Planets and Space 2017 69:37

    Published on: 7 March 2017

  4. Express Letter

    Anelastic properties beneath the Niigata–Kobe Tectonic Zone, Japan

    We estimate the three-dimensional (3D) P-wave attenuation structure beneath the Niigata–Kobe Tectonic Zone (NKTZ), central Japan, using high-quality waveform data from a large number of stations. The obtained ...

    Junichi Nakajima and Toru Matsuzawa

    Earth, Planets and Space 2017 69:33

    Published on: 22 February 2017

  5. Letter

    Upper boundaries of the Pacific and Philippine Sea plates near the triple junction off the Boso Peninsula deduced from ocean-bottom seismic observations

    We determined hypocenter distributions and focal mechanisms of earthquakes off the Boso Peninsula, Japan, based on seafloor observations using ocean-bottom seismometers (OBSs). From OBS data, we detected and l...

    Aki Ito, Hiroko Sugioka, Koichiro Obana, Ryota Hino, Daisuke Suetsugu, Kazuo Nakahigashi, Masanao Shinohara, Masaru Nakano and Yojiro Yamamoto

    Earth, Planets and Space 2017 69:30

    Published on: 9 February 2017

  6. Letter

    Assessment of nonlinear site response at ocean bottom seismograph sites based on S-wave horizontal-to-vertical spectral ratios: a study at the Sagami Bay area K-NET sites in Japan

    We analyzed S-wave horizontal-to-vertical (S-H/V) spectral ratios at six ocean bottom seismograph (OBS) sites of K-NET located in the Sagami Bay area of Japan for nonlinear site responses. The degree of nonlin...

    Yadab P. Dhakal, Shin Aoi, Takashi Kunugi, Wataru Suzuki and Takeshi Kimura

    Earth, Planets and Space 2017 69:29

    Published on: 8 February 2017

  7. Full paper

    Dynamics of the Wulong landslide revealed by broadband seismic records

    The catastrophic Wulong landslide occurred at 14:51 (Beijing time, UTC+8) on 5 June 2009, in Wulong Prefecture, Southwest China. This rockslide occurred in a complex topographic environment. Seismic signals ge...

    Zhengyuan Li, Xinghui Huang, Qiang Xu, Dan Yu, Junyi Fan and Xuejun Qiao

    Earth, Planets and Space 2017 69:27

    Published on: 3 February 2017

  8. Letter

    Geomorphic features of surface ruptures associated with the 2016 Kumamoto earthquake in and around the downtown of Kumamoto City, and implications on triggered slip along active faults

    The ~30-km-long surface ruptures associated with the M w 7.0 (M j 7.3) earthquake at 01:25 JST on April 16 in Kumamoto Prefecture appeared along the previously mapp...

    Hideaki Goto, Hiroyuki Tsutsumi, Shinji Toda and Yasuhiro Kumahara

    Earth, Planets and Space 2017 69:26

    Published on: 2 February 2017

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