4. Seismology

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  1. Full paper

    Difference of horizontal-to-vertical spectral ratios of observed earthquakes and microtremors and its application to S-wave velocity inversion based on the diffuse field concept

    We have been discussing the validity of using the horizontal-to-vertical spectral ratios (HVRs) as a substitute for S-wave amplifications after Nakamura first proposed the idea in 1989. So far a formula for HV...

    Hiroshi Kawase, Yuta Mori and Fumiaki Nagashima

    Earth, Planets and Space 2018 70:1

    Published on: 2 January 2018

  2. Full paper

    Measuring seismicity diversity and anomalies using point process models: case studies before and after the 2016 Kumamoto earthquakes in Kyushu, Japan

    This paper reviews seismic activity in and around the Kumamoto region before and after the April 16, 2016, Kumamoto earthquake of M7.3 using statistical models such as stationary, two-stage, and non-stationary...

    Takao Kumazawa, Yosihiko Ogata and Hiroshi Tsuruoka

    Earth, Planets and Space 2017 69:169

    Published on: 21 December 2017

  3. Full paper

    Application of a simplified calculation for full-wave microtremor H/V spectral ratio based on the diffuse field approximation to identify underground velocity structures

    Under the diffuse field approximation, the full-wave (FW) microtremor H/V spectral ratio (H/V) is modeled as the square root of the ratio of the sum of imaginary parts of the Green’s function of the horizontal co...

    Hao Wu, Kazuaki Masaki, Kojiro Irikura and Francisco José Sánchez-Sesma

    Earth, Planets and Space 2017 69:162

    Published on: 4 December 2017

  4. Full paper

    Investigation of the fluid flow dynamic parameters for Newtonian and non-Newtonian materials: an approach to understanding the fluid flow-like structures within fault zones

    To understand the fault zone fluid flow-like structure, namely the ductile deformation structure, often observed in the geological field (e.g., Ramsay and Huber The techniques of modern structure geology, vol....

    H. Tanaka, Y. Shiomi and K.-F. Ma

    Earth, Planets and Space 2017 69:151

    Published on: 2 November 2017

  5. Full paper

    3-D dynamic rupture simulations of the 2016 Kumamoto, Japan, earthquake

    Using 3-D dynamic rupture simulations, we investigated the 2016 Mw7.1 Kumamoto, Japan, earthquake to elucidate why and how the rupture of the main shock propagated successfully, assuming a complicated fault geome...

    Yumi Urata, Keisuke Yoshida, Eiichi Fukuyama and Hisahiko Kubo

    Earth, Planets and Space 2017 69:150

    Published on: 1 November 2017

  6. Full paper

    Dynamics of a fault model with two mechanically different regions

    We consider a fault containing two regions with different mechanical behaviours: a strong, velocity-weakening region (asperity) and a weak, velocity-strengthening region. The fault is embedded in a shear zone ...

    Michele Dragoni and Emanuele Lorenzano

    Earth, Planets and Space 2017 69:145

    Published on: 23 October 2017

  7. Full paper

    Which is heterogeneous, stress or strength? An estimation from high-density seismic observations

    Using data from high-density seismic observation networks installed in the western Nagano Prefecture region in Japan, we precisely determined focal mechanisms and estimated the high-resolution stress field at ...

    Yoshihisa Iio, Itaru Yoneda, Masayo Sawada, Tsutomu Miura, Hiroshi Katao, Yoichiro Takada, Kentaro Omura and Shigeki Horiuchi

    Earth, Planets and Space 2017 69:144

    Published on: 20 October 2017

  8. Full paper

    Source model of the 1703 Genroku Kanto earthquake tsunami based on historical documents and numerical simulations: modeling of an offshore fault along the Sagami Trough

    The 1703 Genroku Kanto earthquake and the resulting tsunami caused catastrophic damage in the Kanto region of Japan. Previous modeling of the 1703 earthquake applied inversion analyses of the observed terrestr...

    Hideaki Yanagisawa and Kazuhisa Goto

    Earth, Planets and Space 2017 69:136

    Published on: 2 October 2017

  9. Full paper

    V S30, slope, H 800 and f 0: performance of various site-condition proxies in reducing ground-motion aleatory variability and predicting nonlinear site response

    The aim of this paper is to investigate the ability of various site-condition proxies (SCPs) to reduce ground-motion aleatory variability and evaluate how SCPs capture nonlinearity site effects. The SCPs used ...

    Boumédiène Derras, Pierre-Yves Bard and Fabrice Cotton

    Earth, Planets and Space 2017 69:133

    Published on: 22 September 2017

  10. Full paper

    Analysis of rotation sensor data from the SINAPS@ Kefalonia (Greece) post-seismic experiment—link to surface geology and wavefield characteristics

    Although rotational seismology has progressed in recent decades, the links between rotational ground motion and site soil conditions are poorly documented. New experiments were performed on Kefalonia Island (G...

    Sarah Sbaa, Fabrice Hollender, Vincent Perron, Afifa Imtiaz, Pierre-Yves Bard, Armand Mariscal, Alain Cochard and Alain Dujardin

    Earth, Planets and Space 2017 69:124

    Published on: 11 September 2017

  11. Express Letter

    Tomographic image of crust and upper mantle off the Boso Peninsula using data from an ocean-bottom seismograph array

    We determined the three-dimensional structure of the crust and upper mantle off the Boso Peninsula, Japan, by analyzing seismograms recorded by ocean-bottom seismometers and land stations between 2011 and 2013...

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

    Earth, Planets and Space 2017 69:118

    Published on: 24 August 2017

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