Gee Whillikers Guys, my system is only designed to get
2Hz to 3 Second vertical (Z) waves but with this Tonga quake
a few minutes ago Im getting 20 second surface waves
they must be really large since my system is relatively
insensitive at these periods. Can someone give me an
idea of the actual peak ground deflection from this
7.1 Tonga Quake at 20 seconds period surface waves and 81 degrees away ?
I do not know how to do this myself.
regards
geoff


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