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  • May 10, 2017

EPS Young Researcher Award 2016

Michiyo Sawai, Takehiro Hirose, Jun Kameda (2014), Frictional properties of incoming pelagic sediments at the Japan Trench: implications for large slip at a shallow plate boundary during the 2011 Tohoku earthquake, Earth, Planets and Space, 66:65, doi: 10.1186/1880-5981-66-65 The slip at the shallow part of the megathrust triggered the destructive Tsunami associated with the Tohoku Earthquake in 2011. Thus, it is important to understand how such a large rupture can… Read more

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  • May 10, 2017

EPS Excellent Paper Award 2016

Yushiro Fujii, Kenji Satake, Shin’ichi Sakai, Masanao Shinohara, and Toshihiko Kanazawa (2011), Tsunami source of the 2011 off the Pacific coast of Tohoku Earthquake, Earth Planets Space, 63, 815–820, doi:10.5047/eps.2011.06.010 This paper compiled the Tsunami waveform data from tide gauges, GPS wave gauges, and ocean bottom pressure gauges associated with the 2011 Tohoku Earthquake. From the waveform inversion, the authors successfully explained the two-step waveforms, which were the most outstanding… Read more

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  • April 26, 2017

Importance of rheological heterogeneity for interpreting viscoelastic relaxation at a subduction earthquake

Suito (2017) developed a three-dimensional viscoelastic model using Finite Element Method to understand the postseismic deformation that followed the 2011 Tohoku-Oki earthquake and to clarify which elements of the viscoelastic media affect the observed surface deformation. Of particular importance is the consideration of different viscosities between the mantle wedge and the oceanic mantle, and the inclusion of a thin weak layer beneath the slab, which has a dramatic impact on… Read more

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  • January 17, 2017

Waveform inversion for 3-D S-velocity structure discovers possible evidence for a remnant slab and a passive plume

Suzuki et al. (2016) have conducted waveform inversion to infer the three-dimensional (3-D) S-velocity structure in the lowermost 400 km of the mantle (the D'' region) beneath the Northern Pacific region. The 3-D S-velocity model obtained in this study shows prominent features of velocity anomalies. The high-velocity anomalies are interpreted as remnants of slab material where the bridgmanite to Mg-post-perovskite phase transition may have occurred within the slab; the low-velocity… Read more

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  • January 17, 2017

Slip-partitioned surface ruptures following the 2016 Mw 7.0 Kumamoto earthquake

Together with geodetic and seismic inversions of subsurface fault slip for the 2016 Mw = 7.0 16 April 2016 Kumamoto earthquake, Toda et al. (2016) present a schematic structural model where oblique motion occurred on a northwest-dipping subsurface fault and the slip is partitioned at the surface into strike-slip and normal fault scarps. Their simple dislocation model demonstrates that this bifurcation into pure strike-slip and normal faults likely occurs for… Read more

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  • November 15, 2016

Response of hydrothermal system to stress changes

Time-lapse monitoring of seismic velocity at volcanic areas can provide unique insight into the property of hydrothermal and magmatic fluids and their temporal variability. Taira and Brenguier (2016) established a quasi real-time velocity monitoring system by using seismic interferometry with ambient noise to explore the temporal evolution of velocity in the Lassen Volcanic Center, Northern California. Read more

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  • November 15, 2016

Toward the effective geodetic observation network

About 40 tracking stations all over the world are currently operational for Satellite Laser Ranging (SLR), a very precise geodetic technique. Otsubo et al. (2016) ran a unique simulation to find the optimal place of a future SLR station. The answer depends on a geodetic product and one example is shown for the center of gravity of the Earth: the X and Y components are largely improved by a high-latitude station especially in the southern hemisphere, whereas the Z component is improved by a low-latitude station. Read more

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