Question

The 1906 San Francisco earthquake had a magnitude of 7.9 on the MMS scale. At the same time there was an earthquake with magnitude 5 that caused only minor damage. How many times more intense was the San Francisco earthquake than the South American one?

Answer 1

What is formula for relationship between MMS scale and intensity? {[Logarithmic]

Answer 2

log(A/B)

Answer 3

The way I was trying to solve it is 10^R = Richter scale
10^7.9/10^5 = 10^2.9 = 794.33 but I am wrong

Answer 4

I don't like this question. Tokyo just had an earthquake -_- bad taste whoever wrote this

Answer 5

I think I have part of the answer but I am not sure how to determine how much stronger it is.

Answer 6

\(\LARGE dE = 10^{\frac{3}{2}(m_1 - m_2)} \)

dE = difference in energy
\(m_1\), \(m_2\) = intensities of earthquakes

Answer 7

I got that far but I need to figure out how much more intense the first earthquake is from the second earthquake. Is there another formula?

Answer 8

Substitute the variables with numbers and solve for dE.
\(m_1 = 7.9\), \(m_2 = 5\)

Answer 9

I am trying to figure out how to enter it on the calculator.

Answer 10

TI-83

Answer 11

7.9 - 5 = 2.9
1.5 * 2.9 = 4.35
10^4.35 = 22,387

Answer 12

I put it in as 10*1.5^(7.9-5)

Answer 13

It returns 32.4089269

Answer 14

I am probably off with the ()

Answer 15

This is what it should be:

10^[1.5*(7.9-5)]

Answer 16

On the calculator, I put (10^(1.5)*(7.9-5))

Answer 17

I have a difficult time to get it right on the calculator so need all the practice

Answer 18

No.

Answer 19

Put parentheses around the entire exponent part.

10^(1.5*(7.9-5))

Answer 20

5623.41

Answer 21

It should be 22,387

Answer 22

That was my answer a few responses ago.

Answer 23

Yes, I am trying to reproduce your answer on the calculator. Thanks for being patient with me

Answer 24

Do it in two steps.
First calculate the exponent.

1.5 * (7.9 - 5)
What do you get?

Answer 25

4.35

Answer 26

Great.
Now do the power:
10^4.35

Answer 27

22387

Answer 28

That's it.

Answer 29

Ok, so it is not possible to input that in one step on the calculator and come up with the same answer? I often try to put it all in one equation and return the answer

Answer 30

You should be able to.

Answer 31

10^(1.5*(7.9-5)) =

Answer 32

That was it.

Answer 33

I put in an extra parenthesis and that gave me a different answer.

Answer 34

ok

Answer 35

10^(1.5*(7.9-5)

Answer 36

I left off the second parenthesis which is kind of weird.

Answer 37

Thank you for taking the time to help.

Answer 38

You're welcome.