[caww]

The magnitude 7.7 earthquake in Russia was so powerful, it sent the seismometer in Montrose in Laurens County into a frenzy...

[Squantos]

Wow .....

[TXnMA]

Do you have a URL you can share for data like that plot you posted of the seismograph in Laurens County? Those alternating color traces can be very helpful in sorting things out -- especially at times like this!

And that 15-minute/trace time base helps, as well...

I've been monitoring (publicly accessible) "GSN" stations -- which are, conveniently for my purposes, located in the Far East -- but are monochrome -- and use a one hour/trace timebase. Useful -- but, not elegant... '-)