Jökull - 31.12.2001, Blaðsíða 54
Bryndís Brandsdóttir et al.
vegar hafði niðurrennsli affallsvatns á árunum 1988
og 1989 engin marktæk áhrif á sama svæði þar sem
poruþrýstingur þess hafði lækkað til muna á milli nið-
urdælingartilraunanna.
REFERENCES
Axelsson, G., Ó. G. Flóvenz, A. Hjartarson, S. Hauks-
dóttir, G. Sverrisdóttir, F. Árnason, A. Árnason and
R. Böðvarsson 2000. Thermal energy extraction by
reinjection from the Laugaland geothermal system
in N-Iceland. Proceedings of the World Geothermal
Congress 2000, Kyushu-Tohoku, Japan, 3027-3032.
Batani, F., R. Console and G. Luongo 1985. Seismological
study of Larderello-Travale geothermal area. Geother-
mics 14, 255-272.
Björnsson, G. and B. Steingrímsson 1991. Changes intem-
perature and pressure within the Svartsengi geother-
mal field during exploitation. National Energy Author-
ity, Int. Rep. OS-9I016/JHD-04 69 pp, (In Icelandic
with an English abstract).
Combs, J. and D. Hadley 1977. Microearthquake investi-
gation of the Mesa geothermal anomaly, Imperial Val-
ley, California. Geophys. 42: 17-33.
Davis, S. D. and C. Frohlich 1993. Did (or will) fluid in-
jection cause earthquakes? - Criteria for rational as-
sessment. Seismol. Res. Lett. 64, 207-224.
Einarsson, P. and S. Björnsson 1979. Earthquakes in Ice-
land. Jökull 29, 37-43.
Einarsson, P. 1991. Earthquakes and present-day tectonism
in Iceland. Tectonophysics 189, 261-279.
Eysteinsson, H. 1993. Elevation and gravity measurements
on the western part of the Reykjanes peninsula dur-
ing 1992. National Energy Authority, Int. Rep. OS-
93029/JHD-8 53 pp, (In Icelandic with an English ab-
stract).
Eysteinsson, H. 2000. Elevation and gravity changes
at geothermal fields on the Reykjanes Peninsula,
SW Iceland. Proceedings of the World Geothermal
Congress 2000, Kyushu-Tohoku, Japan, 559-564.
Franzson. H. 1990. Svartsengi. The geology of the Svarts-
engi geothermal reservoir and its vicinity. National
Energy Authority, Int. Rep. OS-90050/JHD-08 41 pp,
(In Icelandic with an English abstract).
Foulger, G. R. 1988. Hengill triple junction, SW Iceland.
2. Anomalous earthquake focal mechanisms and im-
plications for process within the geothermal reservoir
and at accretionary plate boundaries. J. Geophys. Res.
93, 13,507-13,523.
Foulger, G. R., R. E. Long, P. Einarsson and A. Björnsson
1989. Implosive earthquakes at the active accretionary
plate boundary in northern Iceland. Nature 337, 640-
642.
Gilpin, B. and T. C. Lee 1978. A microearthquake study in
the Salton Sea geothermal area, Califomia. Bull. Seim.
Soc. Am. 68, 441^150.
Klein, F. W., P. Einarsson and M. Wyss 1977. The Reykja-
nes Peninsula Iceland, earthquake swarm of Septem-
ber 1972 and its tectonic significance. J. Geophys. Res.
82, 865-888.
Lister, C. R. B. 1974. On the penetration of water into hot
rock. Geophys. J. R. Astron. Soc. 39, 465-509.
Majer, E. L. and T. V. McEvilly 1979. Seismological in-
vestigations of the Geysers geothermal field. Geophys.
44, 246-269.
Sherburn, S., R. Allis and A. Clotworthy 1990. Microseis-
mic activity at Wairakei and Ohaaki geothermal fields.
Proc. 12th New Zealand Workshop, 51-55.
Sigurgeirsson, M. Á. 1995. The younger Stampar erup-
tion at Reykjanes, SW-Iceland. Náttúrufræðingurinn
64, 211-230, (In Icelandic with an English abstract).
Zoback, M. D., and H. P. Harjes 1997. Injection-induced
earthquakes and crustal stress at 9 km depth at the
KTB deep drilling site, Germany. J. Geophys. Res.
102, 18,477-18,491.
Vatnaskil 1989. Svartsengi - Reiknilíkan af jarðhita-
kerfinu. National Energy Authority, lnt. Rep. OS-
8903l/JHD-05 111 pp, (In Icelandic).
Vatnaskil 2002. Svartsengi - Reykjanes, Vinnslueftirlit ár-
ið 2001. Verkefnisstjóri S. Þórhallsson. National En-
ergy Authority, Int. Rep. OS-2002/017 111 pp, (In Ice-
landic).
Ward, P., G. Pálmason and C. Drake 1969. Microearth-
quake survey and the Mid-Atlantic Ridge in Iceland.
J. Geophys. Res. 74, 665-684.
Ward, P. and S. Björnsson 1971. Microearthquakes,
swarms, and the geothermal areas of Iceland. J. Geo-
phys. Res. 76, 3953-3982.
52 JÖKULLNo. 51