Jökull - 01.01.2010, Page 24

Brandsdóttir et al.
Figure 1. Seismicity within the South Iceland Seismic Zone and Hengill Triple Junction (H), 1992–2009. Event locations
from the IMO published in the SIL database (2009) are color coded by time. Surface strike-slip faults mapped by Einarsson
(this issue) are shown with dark grey lines. Fault plane solutions for historical mainshocks are from the CMT Catalogue
(2009). Fault plane solution, fore- and aftershocks (black) of the 1987 Vatnafjöll earthquake are from Bjarnason and Einars-
son (1991). Temporary seismic stations have black triangles and permanent stations red. Roads are light grey. Upper
right: A structural map of the plate boundary of Iceland (Einarsson and Saemundsson, 1987). A red square marks the study
area within the South Iceland Seismic Zone (SISZ). Fissure swarms of individual volcanic systems within the volcanic
zones are yellow. Reykjanes Peninsula Rift Zone (RPRZ), Western Volcanic Zone (WVZ), Eastern Volcanic Zone (EVZ),
Northern Volcanic Zone (NVZ) and the Tjörnes Fracture Zone (TFZ). – Upptök jarðskjálfta í brotabelti Suðurlands og
á Hengilssvæðinu, 1992–2009, samkvæmt gögnum úr SIL-gagnagrunni Veðurstofu Íslands og gagnagrunni Raunvísinda-
stofnunar Háskólans frá 1987. Brotlausnir stærstu skjálftanna eru frá Harvard CMT listanum og grein I. Bjarnasonar og P.
Einarssonar (1991). Dökkgráar línur sýna legu jarðskjálftasprungna á yfirborði, sjá grein Páls Einarssonar í þessu hefti.
Þríhyrningar tákna jarðskjálftamælistöðvar, rauðir (SIL) og svartir (Loki). Brotlausnir stærstu skjálftanna og eftirskjálfta-
virkni gefa til kynna hægri-handar sniðgengi á N-S lægum misgengjum.
al., 1981). A new sequence seems to be in progress,
initiated by a Ms 5.8 earthquake by Vatnafjöll, on the
western flank of the EVZ and two Mw 6.5 (NEIC)
earthquakes in the eastern part of the SISZ on June
17 and 21, 2000. These events were followed by two
earthquakes with moment magnitudes of Mw 5.8 and
Mw 5.9 within the western SISZ on May 29th 2008
(Decriem et al., 2010). The mainshock magnitude is
Mw 6.3 based on teleseismic data (Harvard).
24 JÖKULL No. 60