Jökull - 01.01.2005, Side 115

Seismic activity in Iceland during 2004
500
60
0
60
0
700
70
0
700
700
80
0
900
hve
GMT Oct 13 11:46 slauga: Gudlaugst2004
Langjökull
Hofsjökull
Blanda
Blöndulón
Sandkúlufell
Guðlaugstungur
Beljandatungur
−19.8°
−19.8°
−19.6°
−19.6°
−19.4°
−19.4°
−19.2°
−19.2°
−19°
−19°
64.9° 64.9°
65° 65°
65.1° 65.1°
65.2° 65.2°
0 5 10
km
SWARMS IN GUÐLAUGSTUNGUR 2004
Single event locations
Relative locations Feb.−May
Relative locations Sep.−Nov.
0
2
4
6
8
10
12
14
Dý
pi
[k
m
]
65.00 65.05
Breiddargráður N
Figure 7. Single event and relative locations of earthquakes in Guðlaugstungur during February-November
2004. Black triangle denotes the SIL station hve at Hveravellir. – Venjulegar og afstæðar staðsetningar skjálfta
í Guðlaugstungum, febrúar-nóvember 2004. Svarti þríhyrningurinn sýnir staðsetningu SIL-stöðvarinnar hve á
Hveravöllum.
Guðlaugstungur
In March an earthquake swarm occurred near the
glacial river Blanda, in Guðlaugstungur, about 20 km
north of the geothermal area Hveravellir. A smaller
swarm occurred 2 km further east in September. Seis-
micity is not very frequent in this area and earthquake
epicenters located between 1995 and 2003 are mostly
concentrated further south, i.e. west of Hveravellir.
The March swarm started with a single event on 26
February, and it lasted throughout the next month.
Around 50 microearthquakes were located, the largest
reaching a magnitude of only 2.5. Only ten earth-
quakes were recorded in April, but no further activ-
ity happened until September, when roughly 70 events
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