Patrice's comments.
	Navigability: Anchors are fine to navigate through html documents. Anchors to the top page are also great to go back to the table of content. Illustration: Some pictures are outdated and pretty basic. Background colors can be used to emphasize the various sections of a report, or to indicate various level of difficulties. Without logic and with too many of them, background colors can make a document more confusing and more difficult to read. Organisation: Pictures and text are moving in all sort of direction on window re-sizing. The tables that contains your elements are not well constrained. Each picture should have a proper reference: eg. Figure 1: blablabla. Your referencing is not good enough. Comment of the report's content. Introduction. I find a bit odd the way you present the report’s plan. You start by referring to section 3 then you refer to section 2 then to section 4. It is always better to go for “linearity” unless you have a clear motivation to do otherwise. For instance you could have written: Following a brief discussion on the evolution of the theory of gravitational collapse in section 2 we present an overview of crustal thickening processes during subduction and continental convergence in section 3. Section 4 focuses on the physical priniciples that govern gravitational collapse, amongst them Gravitational Potential Energy (GPE), Isostasy, Gravitational Force (Fg) and Lithospheric Strength. There are a numbers of way for a deformed lithosphere to restore its mechanical equilibrium through gravitational collapse. These are presented in section 5…blablabla. Evolution of the Concept of Gravitational Collapse This coupling of ideas allowed the tectonic regimes seen in the Western United States and… In most cases Tectonic Regimes refers to simple shear or pure shear. What you mean is tectonic history. The drawing showing Tibet has not purpose and is outdated. It does help to have illustration with no purpose. Tectonic Thickening of the Continental Crust Crustal thickening initiated by tectonic forces, can arise from continent/continent collision, or from subduction processes. Nice example of bad use of ponctuation. I propose: Crustal thickening, initiated by tectonic forces, can arise from continent/continent collision or from subduction processes. …. both of the crustal plates are too buoyant in relation to the underlying lithosphere for… What do you mean by a lithosphere underlying a crustal plate? What is a crustal plate anyway? Forces acting of the thickened crust. There is a lack of basic explanation. Why is the concept of isostasy relevant to the concept of gravitational collapse. Your report explains briefly what isostasy is but does not explain how it relates to gravitational collapse. The definition of GPE given in the report is that relevant to classical mechanics where the position of an object is represented by the position of its center of mass and where its mass is assumed to be concentrated on the center of mass. A lithospheric column is a very large object which occupies a range of position in the gravitational field. In addition the distribution of mass is very heterogeneous as the density varies within the lithosphere. The GPE of a lithospheric column is the vertical integration its confining pressure profile: Density(z).g.z. The gravitional force that two column apply to one another is equal to the difference in GPE. The force is directed from the column of higher GPE toward that with the lower GPE. In other terms extension occurs in the column with an excess in GPE and contraction occurs in the column with a deficit in GPE. Lithospheric Strength and the Argand Ratio I find that section difficult to follow. There is too much writing to explain a concept that is quite simple. The picture on the blue background needs more explanation. Explain how it related to the concept of Argand Ratio. e.g.: The top shows the case where AR<1 because of a very small Fg, no gravity driven deformation is expected. The picture at the bottom illustrates the case where AR>>1 hence divergent collapse will develop. Restoring Mechanical Equilibrium Through Gravitational Collapse Nice title, it reflects a deep level of understanding and it is very illustrative of the content of that section. … left the system out of mechanical eqilibrium. Indeed equilibrium… … the report discusses a way in which the system…. discusses ways…. … The particles move towrd the…. toward… ….must be accommodated. the way in which… The way…. … and shortening of the araes adjacent… …areas… …. depending on the type of deformation involved….. depending of the strain partitioning between the upper and the lower crust. …. GPE are reduced by dispalcement of the…. displacement…. Indications of gravitational collapse in the field Up until now we have been talking in terms of theories and experimental results… its seems I missed the section on experimental results. ….thickening lithosphere of Mesozoic of Tertiary origin. ??? what the... …. With an average elevation of 5000m above sea level…. I would be extremely surprised if the average elevation of the Himalayas was 5000m! (P.England p.276) That’s not the way we refer to a paper. For a single author: (England, 1996) for two authors (England and Molnar, 1997) more that two authors: (Rey et al., 2001). … seismology is the study of the normal, reflected, refracted and rarefracted primary and secondary waves… rarefracted ???? what the hell is that? Can you please replace the paragraph about seismology (not very relevant) by a map showing the distribution of focal mechanisms in Tibet to illustrate that there is active extension in Tibet? This section lack of linearity, we expect example of collapsed orogens and indicators of collapse. Instead we go back to the mode of collapse.