Application of seismic triplications to image the structures of the mantle transition zone
The mantle transition zone is between the upper and lower mantle.As a key region for the material cycling in Earth,the mantle transition zone has long been a concern of the geoscience community.The 410 and 660 discontinuities are the upper and lower boundaries of the mantle transition zone.Imaging the velocity structure near the 410 and 660 discontinuities and the undulation pattern of the discontinuities can help to understand the cycling of materials and energy between the upper and lower mantle.Seismic triplications are sensitive to the velocity structure with slow changes.So,it can be used to directly constrain the velocity structure near the discontinuity and the undulation pattern of the discontinuity.In this paper,we briefly introduce the response characteristics of the triplications to the structure of the mantle transition zone and the research results of several mantle transition zones around the world using the triplications waveform fitting method.We discuss the ability of the mantle transition section undulations and subduction-retained materials to constrain the mantle material composition,temperature changes,mantle mineral water content,mantle dynamic processes,and the earth's internal material circulation process.
万方数据
维普
