I believe this is what I saw too.

----- Original Message ----- 
From: "Dale Hardy" 
To: "PSN" 
Sent: Sunday, July 19, 2009 4:43 PM
Subject: T wave


The recent M7.8 New Zealand EQ produced " T " waves which showed up very strongly on my geophone.
"T" phase & is seen for big events - it is transmitted through the ocean water, rather than through the rock below  - hence it is 
slower  - only seen for events under oceans ( & probably have to be shallow as well)

http://www.daleh.id.au/New_Zealand_M_7.8_T_wave.gif

regards

Dale 

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)