The Moho is a fundamental, first order discontinuity in the Earth. The 100-year anniversary of its discovery by Andrija Mohorovičić is commemorated by an Elsevier book edited by the convenors to appear in spring 2013. This symposium will include a series of talks by authors of the book, and other contributions on the structure and evolution of the crust and the nature of the Moho are also very welcome.

Following the structure of the book, the symposium will focus on five themes:
I. Historic perspective
II. Seismic Moho: regional studies.
III. Physical nature of the Moho: non-seismic geophysical and petrological studies
IV. Processes that create and modify the Moho: geodynamic perspective
V. Moho from the Hadean to present: how and when was the earliest crust created?

Based on the regional contributions to the book, a new global database on crustal structure and Moho depth of the continents and oceans is being compiled. We expect that the database will be useful to many communities, not least for crustal correction to geophysical interpretation and modelling, being compiled by researchers with deep insight into the regional structure. We invite all authors who study the crustal structure of continents and oceans by any type of methods, as well as authors who use data on the crustal structure in their analysis, to contribute to the session.

I.M. Artemieva, B.L.N. Kennett and H. Thybo