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View Code? Open in Web Editor NEWElectromagnetic methods in geophysics - open educational resources.
Home Page: http://em.geosci.xyz
License: Creative Commons Attribution 4.0 International
Electromagnetic methods in geophysics - open educational resources.
Home Page: http://em.geosci.xyz
License: Creative Commons Attribution 4.0 International
The long titles don't look very good on the navbar. We might be able to assign an abbreviated title?
Content for time domain electric dipole
Pages that need to be filled in:
Located in
maxwell1_fundamentals/
maxwells_equations/
maxwells_equations_in_homogeneous_media/
time_domain/
dipole_sources/
electric_dipole/
See attached notes:
http://em.geosci.xyz/en/latest/_images/LenzsLawDiagram.png is not properly referenced, and with the copyright stamp on it, it doesn't look like we have permission to reproduce it. Wikimedia commons has a pretty good database of figures (https://commons.wikimedia.org/wiki/Main_Page), and the licensing attached to them is pretty transparent, so that is a good place to look. Otherwise, this figure should be re-created by us
Similar structure to #101
http://em.geosci.xyz/content/case_histories/mt_isa/data.html
The writing is pretty terse. Anything more to be added? Also why is one IP pseudosection truncated and the other not? We were unable to fit the long off-set IP data and hence they were winnowed in the inversion. The paper talks about this. Expand as you can and I'll try to fill in the blanks. Your images are great but they will have more impact if there is extra dialogue/learning associated with them.
http://em.geosci.xyz/content/case_histories/mt_isa/processing.html
Extra comments about the individual 2D inversions on p-dp or dp-p?
_A resistive domain on the western edge of the survey, marked by a steeply dipping contact near location 11,300 m, which may correspond to the Surprise Creek Formation
Hard to locate 11,300 on the image.
The synthetic geology model is complicated and the initial paper was never interpreted in terms of that complexity. I think the essential geology is from east to west
(a) eastern volcanic zone (resistive)
(b) native Bee which houses breakaway shales and norvit
(c) potential western Surprise Creek (which is resistive) It may be that the Moondarra is not be a significant unit. The western side is thus Surprise Creek and Eastern Volcanics
(d) between (b) and (c) there might be another resistive and slightly conductive zone (moondarra and Eastern Creek volcanics quarzites) but we can't distinguish between the quartzites and surprise creek and also between moondarra and native Bee. Trying to tie our inversion images to all of these elements means were a likely over interpreting, and in process, making things complicated.
A narrow, steeply dipping conductor near 12,300 m, adjacent to a more resistive unit, possibly the conductive Breakaway Shale within a resistive Native Bee Siltstone._
My story, and the one laid out in the paper, is consistent with
(a) resistor in the west
(b) a background low conductivity unit that includes a mid-sized conductor (novit) and a large conductor (black shale)
(c) and for the southern half: a resistive unit to east and indication of a conductor.
If we can simplify our geology to that general model then we can be in step with the images and geologic interpretation presented in the case history.
Fig 89: Is this the final figure? I thought the max conductivity was 0.4 S/m for the contaminating block on the west.
http://em.geosci.xyz/content/case_histories/mt_isa/processing.html
2D IP inversion: What happened to some of the northern lines?
Is there a story that can be attached? Something to be learned by the reader?
http://em.geosci.xyz/content/case_histories/mt_isa/processing.html
The 3D IP inversion is very complicated. By changing the iso-surface limits can we get something that looks like Fig 4b in the initial paper?
Also, as per the initial paper (Fig 4a, Fig 4b) can we put on a line for the Breakaway shale and the Mt. Novit horizon?
(c)
Need to say something about the large conductor on the west
http://em.geosci.xyz/content/case_histories/mt_isa/interpretation.html
Let's talk about this. I worry that we are over-interpreting. See my comments above.
http://em.geosci.xyz/content/case_histories/mt_isa/interpretation.html
Again, we should discuss. My suggestion is
(a) keep the intepretation simple. If we can reach the same general conclusions as the initial paper then we will make an impact.
In this regard, you have some movies, but can we make exactly the same movie as Roman did. Le'ts look at it and see what we think. That movie, although simple, had a huge impact on the audience and it made important statements visually without the need for dialogue.
(b) Perhaps more intricate discussion and geologic interpretation can be put into a second "lessons worth highlighting" There we can discuss all of the items of concern and the potential for more intricate intepretation.
http://em.geosci.xyz/content/case_histories/mt_isa/synthesis.html
Synthesis should recap the ability for DC and IP to delineate between the two conductive and chargeable units and the benefits of looking for two physical properties. Do the best you can and we can discuss.
Example is not very inviting / motivating
Content for Frequency Domain electric dipole
Pages that need to be filled in:
Located in
maxwell1_fundamentals/
maxwells_equations/
maxwells_equations_in_homogeneous_media/
frequency_domain/
dipole_sources/
electric_dipole/
See attached notes:
For all topics, there should be a purpose! See how to highlight it using a .. topic::
box in the wiki: https://github.com/ubcgif/em/wiki/Development-Notes
Content for time domain magnetic dipole
Pages that need to be filled in:
Located in
maxwell1_fundamentals/
maxwells_equations/
maxwells_equations_in_homogeneous_media/
time_domain/
dipole_sources/
magnetic_dipole/
See attached notes:
\varepsilon
or \epsilon
??
The link to the video: http://video.mit.edu/watch/physics-demo-lenzs-law-with-copper-pipe-10268/ on the page em/content/maxwell1_fundamentals/fundamental_laws/lenz.rst is no longer playing :(
So we should find a new one or remove it for the time being.
If you happen to find a video on youtube we can embed it using: https://pypi.python.org/pypi/sphinxcontrib.youtube
The site is now too large to build through read the docs, so we could...
Looking good! These are just a couple minor technical house-keeping items:
.. math::
, after a table or an itemized list) a new line needs to be included (it signals the end of the environment and makes the build more stable)\left( \right)
(ie. equation after 7)\mathbf{\nabla}
b/c it is a vector operatorThe Biot-Savart Law is not an independent law but is derivable from others. Nevertheless it plays an important role in much of our analysis so we have an entry under "fundamental laws".
Also, currently Biot Savart is brought into Gauss's law for magnetics but without any indication of what it is.
Some maths formulas do not display well in the new outfit:
http://em.geosci.xyz/content/maxwell2_dc/fields_from_grounded_sources_dcr/electrostatic_sphere.html
other example on http://em.geosci.xyz/content/maxwell2_dc/governing_equations/interface_conditions.html?highlight=interface%20condition
@dccowan suggested an appendix containing derivations, useful math that also contains scripts / resources for using these. Please add topics here!
#67 introduced the wavenumber page (wave_number.rst) inside of /Users/lindseyjh/git/geosci/em/content/maxwell1_fundamentals/physical_principles/maxwells_equations_in_homogeneous_media that is not currently in a table of contents tree.
The content should be included, as relevant, to the wave propagation in free space (topic of the pull request #58) @sdevriese, you may want to take a look at this file and see if the content @micmitch generated meshes with what you have done
Mt. Isa: opening page: paper does not come up
http://em.geosci.xyz/content/case_histories/mt_isa/setup.html
color codes on the synthetic??; Mt Novit Horizon in the circle should have its own color; it'shosted either by Native Bee or Moondarra Siltstone if we go by the text; For this diagram Mt. Novit is hosted by Native Bee (background blue) and Moondarra siltstone is on the east. Let's stick with that.
http://em.geosci.xyz/content/case_histories/mt_isa/properties.html
The Moondara siltstone and Native Bee are indistinguishable cousins from our perpsective. They are both moderately resistivity (10-15 ohm-m); The Mt Novit horizon, when mineralized will be more conductive than these hosts. (0.7 ohm-m for 4.8% Cu). The Breakaway shale is conductive
Maybe we should provide numbers:
Low: rho>> 15 ohm-m
Med rho ~ 10-15 ohm-m
High rho << 10 ohm-m
this would mesh with the text and also help us out later when we think of Mt.Novit horizon having a "moderate conductivity: bigger than background siltstone but less than the Breakaway shales)
What is justification for Moondarra unit being chargeable? Also, why are Eastern Creek Volcanics listed as chargeable?
http://em.geosci.xyz/content/case_histories/mt_isa/survey.html
Does the pseudo-section fill out? I don't think the current plot is overly informative.
"The unit of interest is the Mt. Novit Horizon which is conductive compared to the host Moondarra Siltsone. We also expect a large conductive contrast between the Breakaway Shale unit and the Native Bee siltstone, which may also be a host for mineralization. "
In our diagram earlier we had the Mt. Novit horizon in the Native Bee.
In the Survey Design: This is a nice section that goes from currents, to pseudo-sections to inversions.
The current density and figures are interesting but can you provide some reasons for what to look for and what information can be cleaned? Although it lengthens the presentation, having the plot with and without the conductor would be informative. Then we can state that we notice how the conductor draws in the currents.etc... Also, that meshes with the pseudo-section plots given next.
I guess this will be a useful for making concise documents.
http://stackoverflow.com/questions/2454577/sphinx-restructuredtext-show-hide-code-snippets
if it is easy to re-create, there are a couple figures with overlapping text and colorbars. This can be solved with plt.tight_layout()
at the end of the plotting instructions in python
the repo https://github.com/ubcgif/em_examples has been created to hold notebook examples. This is hooked up with binders so that the examples can be run on the web without requiring python or dependencies be installed.
Content for frequency domain magnetic dipole
Pages that need to be filled in:
Located in
maxwell1_fundamentals/
maxwells_equations/
maxwells_equations_in_homogeneous_media/
frequency_domain/
dipole_sources/
magnetic_dipole/
See attached notes:
Figures in "setup" and "properties" need to be remade.
add a table with equation names, equations and how to include in the introduction of geosci em
Updated interpretation discussion
Remove circle/background from pseudo-sections (Fig 101)
Remove true model from background and add it to a third vertical panel (Figure 102).
Add larger chifact for individual 2D IP inversions - 2 northernmost lines only
Synthesis: old versus new (plan view) with DC and IP
We can add a spell checker on the text through - http://sphinxcontrib-spelling.readthedocs.io/en/latest/customize.html. It looks reasonably flexible, so we can add words to our own dictionary, etc.
When integrating over a Volume, Surface or Line, what do we want to use as symbols?
I encountered a couple of .PNG images instead of .png. With capitals, the image are not displayed on em.geosci (but this error is not detected by travis).
@fourndo and I were chatting earlier and he suggested we think about calling Maxwell 2 Static (so we have Static, FDEM, TDEM) - Then we could refer to dc resistivity as DC (not DCR). Thoughts?
The pages
do not appear in any toc tree. Has the content been moved into / combined into another page? Should we remove them?
When describing units, should we use italicized in math (option a) or text mode in math (option b)
a. m/s: \\( m / s \\)
b. m/s : \\(\\text{m/s}\\)
@dougoldenburg thoughts?
\text{}
envirohttp://em.geosci.xyz/content/case_histories/mt_isa/properties.html
Add geologic model from setup over top of the conductivity model
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