Geologic Mapping C

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Re: Geologic Mapping C

Postby UTF-8 U+6211 U+662F » January 12th, 2019, 1:37 pm

Hello Everyone!

I was just wondering if anyone here know what lines that are not faults in a relative dating/strata diagram are. Here's a link https://d2vlcm61l7u1fs.cloudfront.net/m ... IiQrsg.png. I'm specifically talking about "G" in this picture.

Thanks!
What does line G represent? It's not a fault because there isn't any relative motion across it as you can see in line K

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Re: Geologic Mapping C

Postby fabishkf » January 12th, 2019, 8:36 pm

joint
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Re: Geologic Mapping C

Postby bluesm0ke » January 21st, 2019, 8:12 pm

On one test, the formula for true thickness was given as T = Wsin(d) + Hcos(d) where T = true thickness, W = width, H = height, d = dip, whereas on another test, the formula for true thickness was given as T = Wsin(d) where T = true thickness, W = width, d = dip. Which one is the correct formula? I am very confused.
What is height?

(Note that a formula for true thickness can be derived using basic trig in emergencies!)
I would strongly recommend deriving the formula yourself, so you understand how it works. There are several standard formulas for true thickness that cover various situations.
Do you think you could post those formulas here? I'm having a hard time grappling more complex true thickness problems that don't just use the basic formula. thanks

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Re: Geologic Mapping C

Postby Unome » January 22nd, 2019, 12:46 pm

What is height?

(Note that a formula for true thickness can be derived using basic trig in emergencies!)
I would strongly recommend deriving the formula yourself, so you understand how it works. There are several standard formulas for true thickness that cover various situations.
Do you think you could post those formulas here? I'm having a hard time grappling more complex true thickness problems that don't just use the basic formula. thanks
I don't have the third one memorized, and can't seem to find it, but I'm pretty sure it's on one of the test exchange tests.
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Re: Geologic Mapping C

Postby poonicle » January 24th, 2019, 6:45 pm

What is height?

(Note that a formula for true thickness can be derived using basic trig in emergencies!)
I would strongly recommend deriving the formula yourself, so you understand how it works. There are several standard formulas for true thickness that cover various situations.
Do you think you could post those formulas here? I'm having a hard time grappling more complex true thickness problems that don't just use the basic formula. thanks
yeah, i'm not gonna lie, i asked that question before TSTs when i didn't know that much about the event. my accuracy improved a lot when i started drawing stuff out then applying trig as opposed to formulas--i'm not very good at identifying which formula applies to which situation yet, but drawing a picture really, really helps imo

that being said, i found T = w*sin(D - S) where D = dip, S = slope, T = true thickness on one practice test. hope that's helpful
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Re: Geologic Mapping C

Postby fleicol1 » February 14th, 2019, 12:11 pm

What would be a good website for information on all of the fault. I haven't had much luck finding a good one.

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Re: Geologic Mapping C

Postby UTF-8 U+6211 U+662F » February 14th, 2019, 12:14 pm

What would be a good website for information on all of the fault. I haven't had much luck finding a good one.
There's not just one website with all the info, but here's a start

https://www.usgs.gov/faqs/what-a-fault- ... e_products
https://en.wikipedia.org/wiki/Fault_(geology)
https://www.thoughtco.com/fault-types-w ... ms-3879102

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Re: Geologic Mapping C

Postby l0lit » February 26th, 2019, 4:01 pm

I've seen that there is some discussion on the concept of bed thickness. The only scenario I've seen so far is where T = V cos d where T is true thickness, V is vertical thickness, and d is the angle of dip (as found in this scenario. Are there any other scenarios where the other equations (such as T = V cos d - H sin d ) come into play?
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Re: Geologic Mapping C

Postby UTF-8 U+6211 U+662F » February 26th, 2019, 4:14 pm

I've seen that there is some discussion on the concept of bed thickness. The only scenario I've seen so far is where T = V cos d where T is true thickness, V is vertical thickness, and d is the angle of dip (as found in this scenario. Are there any other scenarios where the other equations (such as T = V cos d - H sin d ) come into play?
It's best to just use trig instead of trying to apply an equation in that scenario in my opinion. Other equations would apply if other angles/lengths were given.

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Re: Geologic Mapping C

Postby Unome » February 26th, 2019, 4:46 pm

I've seen that there is some discussion on the concept of bed thickness. The only scenario I've seen so far is where T = V cos d where T is true thickness, V is vertical thickness, and d is the angle of dip (as found in this scenario. Are there any other scenarios where the other equations (such as T = V cos d - H sin d ) come into play?
It's best to just use trig instead of trying to apply an equation in that scenario in my opinion. Other equations would apply if other angles/lengths were given.
Heh, that's exactly what I was going to say.
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