28 February 2010


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.


Mauigirl said...

Pretty impressive jigglings!

The Cunning Runt said...

I've seen Big Grrrlz at the Gym do less jiggling!

Christina said...

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)