you mean ice quake?  the underground frozen solid ice with such  
expansion= cause earth quake like movement.  common in this neck of  
woods... extreme cold conditions.
http://toronto.ctvnews.ca/hearing-loud-bangs-in-southern-ontario-it- 
was-likely-an-ice-quake-1.1616236

On Feb 27, 2015, at 9:18 PM, Graham Naisbitt wrote:

> Hi Techies
>
> San Diego was fun, good to see so many friends.
>
> I learned something new, but am not sure if it is accurate or for  
> real but - I gather there is a weather phenomenon referred to as  
> "snow quake” - anyone heard of this and if so, what is it exactly?
>
> Have a great weekend everyone,
>
> Graham N
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud  
> service.
> For more information please contact helpdesk at x2960 or  
> [log in to unmask]
> ______________________________________________________________________

______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________