We were asleep and didn't feel it, but this was recorded at the Seismological Observatory at the University in Heredia (about 1 mile from here). What you're seeing is the shake here when the 8.8 earthquake hit Chile two mornings ago.
Over 3000 miles away.
I don't really know how to read these graphs, other than "wow, that's a bunch of jiggling of the markers", but... wow, that's a bunch of jiggling of the markers. Perhaps a geologist will stop by and illumine us. I do know that when we have our li'l 3.whatevers, the jiggling normally only covers about two of the horizontal lines.
3 comments:
Pretty impressive jigglings!
I've seen Big Grrrlz at the Gym do less jiggling!
Okay, the vertical is obviously time. The other is P-wave and S-wave arrival times. (There's another wave also, can't remember the type now) but the width of the "jiggle" tells how great a disturbance in the crust there was. Whether the P wave is bigger or the S wave tells them whether is was deep or shallow. The difference in arrival times tells them how far away it was. Get three of them and you get a triangulation of the epicenter and also the depth in the crust of the quake. (Geology 1401 and 1403-- As in both. TYVM)
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