Jökull - 01.12.1980, Page 53

WIDTH / vídd
FRACTURE NUMBER U5/sprunga númer 45
Fig. 9. Relation between width and throw of two fractures. — Mynd9. Tengsl milli víddar og
lóðréttrar færslu á tveimur sprungum (númer 45 og 36).
tribute significantly to the regional dilation.
However, because of these minor fractures, the
values in Table 3 are probably minimum es-
timates.
Inside the mapped area, the dilation in-
creases from both ends of the fissure swarm
and is greatest near the middle. The swarm is
roughly a half ellipse in shape; it is widest and
contains most fractures near the western end
(Fig. 4a,b). There are 22 fractures in profile 1,
but only 12 in profile 4, and the latter has the
greatest dilation. The reason for this is two-
fold. First: most of the fractures that intersect
profile 1 are closed faults. Second: fractures
Fig. 10. A minor fracture. The
width is about 10 cm, as can be
seen on comparison with the
notebook. Such fractures are
common in this area, but of
local importance only. — Mynd
10. Smásprunga. Vídd sprungunnar
er um 10 cm, eins og sést á saman-
burði við bókina. Smásprungur, sem
þessi, eru algengar á svæðinu, en
skipta ekki máli í reikningunum.
JÖKULL 30. ÁR 51