Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Seismograms - Rayleigh Waves

  1. Feb 15, 2017 #1
    How can you tell where a dispersed Rayleigh wave train ends...? Is there a way to identify the end of a Rayleigh wave train on the following teleseismic records?

    The first shows the full surface wave train, the second is zoomed in but cuts off the final part of the original including the last green line. The red marks show the same cycle on both trains, the blue shows where I believe the LR waves first arrive and the green show 2 possible end points of the LR wave train... there may be a better end point).
    Rayleigh (zoomed).jpg
  2. jcsd
  3. Feb 17, 2017 #2

    jim mcnamara

    User Avatar

    Staff: Mentor

    @davenn is our seismograph guy. Perhaps he can help.
  4. Feb 18, 2017 #3


    User Avatar
    Science Advisor
    Gold Member
    2017 Award

    Hi Jim and @polekitten

    I have been pondering this thread since I first saw it several days ago and trying to think of a good answer :wink:

    To polekitten, my first thoughts are still.... " why do you think that the Love and Rayleigh waves should just suddenly stop rather than slowing tailing off in the coda ?
    I haven't found anything in my searching of various seismogram interpretation doc's that states one way or the other. But my own expectation is that they just tail off

    This is, of course, very different to the P and S waves which pass by the observer as brief pulses lasting maybe 10 - 20 sec. The surface waves are more spread out.

    I am going to keep reading to see if I can find anything definitive ... maybe you could continue to do the same research and see of one of us can find some answers :smile:

    Not sure if we have any other experienced seismogram guys on the forum
    I have been at it for many years, but don't deem myself an expert by a longshot haha ... as in it isn't my day job :wink:

    Last edited: Feb 18, 2017
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Threads for Seismograms Rayleigh Waves
East coast - wave direction and beach sand movement