The main purpose of starting this blog is to get closer to the users of my book, to get feedback and discussions around various aspects of the book that I will use during the preparation for the next edition. Post your views on how chapters and sections can be improved, how you would like to see the next edition, things you (dis)agree with etc.

In addition, this will also be a place to share beautiful images, localities and exchange opinions about things that have to do with structural geology in general.

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## About Haakon Fossen

Professor of structural geology, University of Bergen. Author of book Structural Geology, published at Cambridge University Press

I think that Eq. 2.12 on page 35 is incorrect. The lower right term (D33 term) should be simply the

ratio of 1-phizero over 1-phi because these can be shown to be equal to 1 + capital delta. The first 1 of

that term is not correct. Note that the first 1 would make the value of the D33 term greater than 1.

Thanks

You are right: the “1+” in Equation 2.12 should not be there. 1+delta, which is the lower right entry of the matrix equals (1-original porosity)/(1-final porosity). I think I have made this a bit too complicated. Maybe I will leave out Equations 2.10 β 2.12 and instead explain more clearly how to find 1+delta and changes in angles if we know the finite porosity (phi) and estimate (put a reasonable number for) the original porosity (phi0)? I could leave the matrix (2.12) in if I simplify to what you say in your comment (1-phi0/1-phi). The function (2.10) is more for modeling purposes than anything else.

Thanks,

Haakon

Great book! I will be using it for my class next semester. My students in the advanced structural geology course found an error on Figure 17.8 g. The Fault younging direction should be towards the left side of the image, not the right as shown. I think I have the first version of the book but I did not see a correction to this figure in your website.

Thanks,

Daniel

You are right! Thanks so much for pointing this out. The younging direction is definitely to the left! It is incredible how some of the errors have survived reviews. I will add it to the list on my website.

Anyway, I’m glad you like the book. Make sure you get copies from one of the 2011 prints to avoid previous binding problems.

Thanks again,

Haakon

Figures from your book are not accessible on the cambridge website. Is there an alternative link someplace?

Figures are accessible – I just tested the link. They are kind of hidden away: Go to cambridge.org/features/fossen, click “Figures” (may take a while to load this page), and there, under “Resources” there is another “Figures” heading. Click the greenish text “More resources: select to show/hide” right below and you will see the list of files (300 or 600 dpi) for download. Maybe I should post these on my own website too…

This is an excellent book! I wish I had received such a lucid treatment to a subject like structural geology and tectonics in my B.Sc days. My present lectures on Structural Geology aimed at Petroleum Geosciences Masters students at IIT Bombay has been greatly dependent on this book. The way you presented effect of pure shear in different contexts was superb! That the footwall ramp and flat geometry affect the hanging wall block is extremely well presented! BUT, (1) at a few places more explanations are needed. E.g. how exactly the ‘shale gouge ratio’ is useful is not discussed in detail. Also for some such parameters, throw of the fault is at the numerator, whereas, for the others it is at denominator. Why so- was asked by my student. I didn’t find out answer in this book (I should go back to the original references you cited). (2) Secondly, after scanning a few figures for classroom presentation, the binding opened up :(. Anyway, I got it bound again. Will be eager to see its subsequent editions with more detail discussion on the application of structural geology in (petroleum) industry. Please think of adding the curved dip domain method and the kink method of construction of fold based on limited surface data.

Thanks for your comments! Very useful. Thanks for the comment on shale gouge ratio. If you can give me other instances where more explanations are needed, please do so.

As for the SSF vs SGR ratios: I did not define them. We could redefine SSF as 1/SSF so that the throw becomes the numerator, but it would of course cause quite a bit of confusion.

Thanks for your comments on adding more petroleum geology stuff. I would be interested in more comments on this (from other users). There are many different users of the book, and the balance between petroleum application and other things is an issue that I am concerned about.

Here is my delayed reply. I think the following needs clarifications.

1. P-312, Fig. 16.1 shows different effects of compression. Why these differences will arise needs to be explained. (I face this question from students)

2. Please add strain analyses related to Poiseuille flow. It is a newly touched subject by structural geologists.

3. P-349: please add the concept of ‘channel flow’ to explain Himalayan orogeny.

4. P-316-317: The actual reason of backthrusting is not clearly stated. Please do the needful.

Soumyajit Mukherjee

Respected Professor,

I Rudra Mohan Pradhan from Indian Institute of Technology,Kharagpur.read the structural geology Book.Whatever/howmuch I read, Its a fantastic book I ever been seen.Thank You sir.

ββ

Regards,

Rudra Mohan Pradhan.

M.Sc.(Geology)

Dept.of Geology & Geophysics.

Indian Institute of Technology,Kharagpur.

West Bengal-721302,India

Hope u will b fine..

Thanx Professor for the e-Learning Modules, had been very much helpful in understanding the deformation processes better throughout the semester. I hope I will find something more in near future from the modules.

Regards

Ehtisham Javed

BS (Hons) geology

Bahria University Islamabad

Pakistan