Geoscience Reference
In-Depth Information
Figure 9.18.
The Gakkel Ridge, the slowest-spreading mid-ocean ridge, runs across
the Arctic. Grey shading shows bathymetry. Dots show locations of earthquakes in
1999. The upper inset shows their magnitude and the occurrence of earthquakes on
the Gakkel Ridge from 1995 to 2000. Colour version Plate 19.(Muller and Jokat,
2000. Seismic evidence for volcanic activity at the Eastern Gakkel Ridge.
EOS Trans.
Am. Geophys.
,
81
, 265, 9).
duration. The evidence therefore suggests that that activity on the Gakkel Ridge
was due to intense magmatic activity and may indicate that, on ultra-slow ridges,
melt generation and volcanic activity is very strongly episodic.
Faulting plays an important role in the accretion of new material along the axis
of any mid-ocean ridge. There must be an overall balance between the accretion
