Most existing crust and mantle models are constrained largely by continental observations, since the vast majority of sensors for solid earth geophysics are deployed on the continents. Structures beneath two thirds of the earths surface covered by oceans are yet poorly constrained and explored.

Over the past decade, the possibilities for conducting long-term experiments (e.g. seafloor geodesy, seismological, magnetotelluric) on the ocean floor have steadily increased due to advances in instrumentation, in particular broadband sensors. Yet technical and logistical circumstances for sea-floor deployments remain challenging and costly.

We welcome contributions from all fields of ocean-based measurements for solid earth geophysics, showcasing recent developments and successes. This includes different kinds of ocean bottom instrumentation, experiment design, and results from ocean-based or amphibian deployments.

The session is planned as joint session between the Japan and European Geoscience Unions.

Solicited speakers:

1. Dr. Hiroko Sugioka (Kobe University, Japan)
Title: Practical performance evaluation of the Wave Glider in geophysical observations

2. Dr. Guust Nolet (Geosciences Azur, France)
Title: MERMAID seismometry in the oceans: resolving the detail of geodynamic processes

3. Dr. Ryota Hino (Tohoku University, Japan)
Title: Seafloor seismological/geodetic observations in the rupture area of the 2011 Tohoku-oki Earthquake