PSN-L Email List Message

Subject: Re: Glacier-melting induced quakes
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr500@.........
Date: Wed, 05 Apr 2006 18:22:29 +0000

Hi George

The closest glaciers to me are Langjökull at distance of ~80 Km and
Hofsjökull at distance of ~100 km. Hofsjökull has producsted glacier
quakes, but i haven't been able to detect them. Mostly becose those type
of quakes have little energy and they need water to drive them. But both
of those glaciers are relative small, but Hofsjökull is more deeper, but
max depth there is ~650 meters. Langjökull is not that deep, i don't
know exacly how deep, but i think it is no more then ~400 meters.

The only place that i know of that produces glacer earthquakes on
regular basis is Vatnajökull, then in accurance with flood from under
the glacer it self. The glacer quakes are more common in the summer time
then in the winter time. Becose of a distance i don't pick those up, but
i usally don't detect earthquakes in Vatnajökull zone unless they are
above ~3.0Ml in size. The glacer quakes that happen are however mesured
by the Icelandic Met office, besides flood starting glacer quakes or
icequakes as they are called in the Icelandic Met Office is rain the put
the glacer in movement and creates icequakes, as can be seen here
on this nice graph from the Icelandic Met Office.

Jón Frímann


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