PSN-L Email List Message

Subject: Re: Lehman seismometer movement
From: Steinar Midtskogen steinar@.............
Date: Wed, 16 Mar 2011 19:30:32 +0100

Apparently, the Japan quake was able to cause local mini tsunamis in
Sognefjorden, Norway, about 8000 km away.  Sognefjorden is the second
longest fjord in the world (205km) and up to 1000 metres deep.

Usually, the fjord is flat and waveless, but last Friday a little more
than one hour after the Japan quake the water level began slowly to
rise and sink.  The height difference was as much as 1.8 meters.  It
was seen at several locations along the fjord, and it puzzled
bystanders who much later learned of the Japan quake.

Here's a video of the event:

Clearly it must have been caused by the surface waves from the Japan
quake.  If an earthquake in Japan can do this here in Norway, I'm
fairly convinced now that I did see the boom of my seismometer move,
and I'm less surprised that it saturated at minimum gain for almost
two hours, and even that my geophones recorded both the P and S waves
loud and clear.


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