5-20. Study of the structure and dynamics of the Earth’s deep interior

 

This cooperative research program aims to continue and to further develop the Ocean Hemisphere Research since 2002 FY. We perform long-term global geophysical observations  consisting of seismology, geoelectromagnetism, and geodesy, aiming to reveal the structure and dynamics of the deep interior of the Earth by analyzing and jointly inverting multidisciplinary data. Major scientific targets are as follows:

(1) With a global scope, we focus on the western Pacific region where a particularly large scale mantle downwelling exists. By analyzing network data, we study the mantle structure in terms of the seismic velocity and the electrical conductivity, various kinds ofphenomenon such as the plate motion, deformation of the Earth, geomagnetic field variations, and so forth.

(2) By mobile array observations on land and in the ocean, we try to improve the resolution of structural inversion by one order ofmagnitude.

(3) We also try to develop new observation sensors or systems for the future development of global network observations in 5-10 years.

Refer to section 4-3 for details of recent research results.