help me answer this about determining earthquake epicenter?

Question

here's the link

http://www.sciencecourseware.org/VirtualEarthquake/php/Seismograms.php

choose southern california
then answer the questions

and pls answer the following that is richter magnitude.. and then its done :)

Answer 1

#1 is 35 km 345
#2 is 39 km 384
#3 is 61 km 594

This is the correct data now from here when you measure and answer the questions you will do just fine.
Thankyou for showing me this, I find it very interesting.

Answer 2

Sciencecourseware Virtual Earthquake Answers

Answer 3

I have given this website to my students in the past.....its not THAT hard!!!! Read the information provided

All you really need to know is this....p and s waves move at specific speeds thru the earth. The time btw when the p and s waves arrive...this is shown in a step by step method in the info

To get the epicentre of any earthquake you need 3 readings from 3 different seisomgrams......basically you are triangulating the information.
If say you get a reading from 1 seismopgraph that tells you the earthquake ( based on the P and S wave time differences which can be translated into distance from THAT particular seismograph) is a certain distance in ANY DIRECTION from it...you can draw ( using a compass) a circle around that seismograph...

The second reading will tell the distance from that particular seismograph and you also draw a circle around that one in the same way....at this point your circles will overlap in TWO places....so the earthquake occurred at either of these 2 points and is why the 3rd reading is needed.....if you have calulated exactly the distances from each seisomgraph you will get an overlap in 1 place of all 3 circles and this is your epicentre.

I am sure you can do it....I admit I was a little out when I did it myself, but I was doing it quickly to help some students.....just keep trying.

Answer 4

Science Courseware Virtual Earthquake