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  • October 1, 2018

Volcanic smoke reduction in visible and thermal infrared imagery

Photographs are not what you see. When I (TH) was a student back in 1990s, I was always frustrated with the volcano pictures that I photographed because they somehow did not look like what I thought I really saw. It was often due to white smoke in front. So I used to prefer hand-sketching in which I can build a complete compilation of my observation for several minutes as a… Read more

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  • September 25, 2018

Pyroclastic density currents associated with the 2015 phreatomagmatic eruption of the Kuchinoerabujima volcano

Though "low-temperature pyroclastic flow" is frequently observed with phreatic eruptions, there are few descriptions of its internal environment. The low-temperature pyroclastic flow of the 2015 eruption of Kuchinoerabujima volcano, southwestern Japan, provides geophysical data, video image, and geological descriptions of the deposits. The video image indicates that the velocity of flow exceeded 42 m/s. The dieback of the vegetation and deformation of some plastic materials in the flow, with absence… Read more

  • News
  • August 28, 2018

EPS to revise APC

Please note that beginning September 1st, 2018 the new APC (Article Processing Charge) will be applied. As APC flow chart is also modified with this revision, please recheck the APC flow chart after September 1st, 2018. Read more

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  • July 6, 2018

Lateral variation of the uppermost oceanic plate in the outer-rise region of the Northwest Pacific Ocean

It has been known that Po waveforms are complicated due to high-frequency scattering within the mantle, but Tonegawa et al. (2018) attempted to retrieve Po-to-s (Pos) waves converted at crust-related interfaces by cross-correlating Po wave coda from the radial and vertical components. As a result, their results successfully showed the retrieval of Pos waves from the basement and oceanic Moho, and also demonstrated the effectiveness of this new approach by revealing lateral variations of Pos-wave emergence and layer-dependent shear wave anisotropy from the outer-rise to seaward regions. Click to view the article Read more

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  • July 2, 2018

Understanding and forecasting phreatic eruptions driven by magmatic degassing

Stix and de Moor (2018) compiled recent studies of phreatic eruptions and proposed two endmembers for phreatic systems. Type 1 systems are characterized by a sealed hydrothermal system. Injection of magmatic fluids causes pressurization of the hydrothermal system and eventual rupture of the seal, generating ballistics and fine ash. For a Type 2 system, input of magmatic fluids into a near-surface hydrothermal system vaporizes liquid water, promoting eruptions which emit… Read more

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