Question

Please help me with a L.A.B report! About seismographs and epicenters.

Answer 1

Question.

Answer 2

Chart.

Answer 3

I need help figuring out if I got it correct.

Answer 4

2 minute is not touching 1200 km.
Look again.

Answer 5

What is it touching then..?

Answer 6

Where is the horizontal 2 minute line touching in the diagonal line?

Answer 7

It's in middle of 1200 and 1300...

Answer 8

Yea, so try 1250km

Answer 9

Okay, but am I correct with the other parts, Am I reading this correctly?

Answer 10

It looks like a bit more than 1250 km.
Like 1260 km.

Did you try it?

Answer 11

Okay....

What do you mean? Try it?

Answer 12

Okay, but am I correct with the other parts, Am I reading this correctly?

There is only one question you posted...

Answer 13

Oh..
No, I was talking about the 1st question I posted, Did I fill it out correctly..

Answer 14

I did not know which charts you filled or were automatically filled .
But it is all correct.

Answer 15

P Wave arrives first (primary) then S waves (secondary)
The arrival shows a distinctive pattern.

Answer 16

Ok! Thank you.

Gimme a sec to get the other chart.

Answer 17

I just filled part of this out.. and I need help on the last part and to make sure it is correct.

Answer 18

The difference between 8:07:00 and 8:06:00 is one minute.

Answer 19

How is it 1min?
It's right next to each other...

Answer 20

8:06 is is eight pm and 6 minute.
Like your clock.
8:07 is right pm and 7 minute.

Same as what you did in the last chart.

Answer 21

Oh. Okay.
What about the last part,
I think it is 600km

Answer 22

Me too

Answer 23

What about this one..

Answer 24

Not 8:10:45, more like 8:09:45

Answer 25

Ok.

Answer 26

I think the last one is 1100km

Answer 27

@Shalante You there?

Answer 28

Me too.

Answer 29

Last part

Answer 30

I think it is talking about these cities
Dallas, Texas

San diego, California

Helena, Montana

Answer 31

I think it should look like this...

Answer 32

You would need to draw 3 circles using a compass

Use the distance you got for San Diego.
Pinpoint San Diego and use the scale bar for its radius and circle around it.

Do the same for the 2 other cities.

Your work you showed me was incorrect.
The 3 circles should intersect at 1 point which is the epicenter.

Answer 33

I don't understand how they could intercept..
Can you show me please?

Answer 34

What is your distance for San Diego?

Answer 35

Distance?
What do you mean?

Answer 36

Like this..?

Answer 37

The exercise you did earlier.

All of the practice problems are related to another as a whole for this lab.

Answer 38

Nope that is wrong.
Stop doing them and just answer my questions.

Answer 39

600km for San Diego
1,260km for Helena
1100km for Dallas

Answer 40

Correct.
Do you see the scale bar at the bottom.

Do you know what a radius of a circle is?

Answer 41

^^ is what you are asking, right?
Sorry I'm not being very helpful. I suck at this.

Answer 42

And no..

Answer 43

Look at your map. Do you see a kilometer with rectangles and number in the bottom?

Answer 44

Yes.. I see them

Answer 45

Radius is a line in the circle that extends from the center.
All of the radius length in a circle is the same.

Do you have a compass?

Answer 46

No..

Answer 47

Do I NEED a compass? or can I work without one?

Answer 48

Preferably.
But who cares. Just use a ruler or finger.

Point to San Diego right now.
Stretch your fingers to 600 km using the scale bar.
This 600 km is your radius.
So the circle around Sand Diego should have a 600 km radius.

Answer 49

I have to do the drawing on the computer, so I can't really use my finger

Answer 50

Touch it on your screen?

Answer 51

Uh..Okay.
What next

Answer 52

You never used a scale bar before?

Answer 53

No, not really

Answer 54

Draw the 2 remaining cities.

Answer 55

Wait, I didn't finish the san diego one yet..

Answer 56

Did you follow my steps?

Answer 57

Yes..And this is what I got

Answer 58

Tell me how you did this

Answer 59

I just went around tnhe san diego part after finding 600km part...

Answer 60

I explained to you what a radius is.
Did you understand that?

Answer 61

I didn't see you explaining a radius..
I might have missed your message, give a me a sec and scroll up and look at it..

Answer 62

No need to draw the lines though.

Answer 63

Like this? ;-;

Answer 64

Yes.
Do the same for the other two.

The circles should have an intersection point which is the epicenter of the earthquake.

Answer 65

Like this?

Answer 66

No.
Do what I told you earlier.
Dallas and Helena should in the middle of the circle.

Answer 67

like so?

Answer 68

How did you draw out the circle for San Diego?

Answer 69

I measured the Demo graph you showed me with a ruler, and it showed around 3 inches away from San diego to start the circle.

Answer 70

Then do the same for other 2 cities.
Helena has 1250km
Dallas with 1100

Answer 71

Those are your radius.
Now do you know what a radius in a circle is?

Answer 72

It's the distance from the center of a circle to any point on the circle..?

Answer 73

yes.

Answer 74

Which part amI supposed to start from when I have figured the distance part..?

Answer 75

@Shalante I'm never going to get the other two correct. ;-;
Can you please just show me how..?