Microseismicity of the ultraslow-spreading Gakkel ridge, Arctic Ocean: a pilot study
摘要：
SUMMARYThe active mid-ocean ridge of the Arctic Ocean, named Gakkel ridge, is the slowest spreading ridge of the global system of mid-oceanic ridges with full spreading rates declining from about 12.5 to 6 mm yr−1 from west to east. Geological models of seafloor spreading predict a decreasing intensity of magmatic processes with decreasing spreading rate. In summer 2001, the multidisciplinary Arctic Mid-Ocean Ridge Expedition (AMORE2001) discovered robust magmatism at western Gakkel ridge, an amagmatic section further east and pronounced volcanic centres at eastern Gakkel ridge. During AMORE2001, an attempt was made at recording the microearthquake activity of the ridge which allows important insights into the character and dynamics of active crustal accretion at the ridge axis. Due to the permanent ice cover of the Arctic Ocean, the use of ocean-bottom seismometers bears the risk of instrument and data loss. In this pilot study, we used for the first time drifting ice
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关键词：
earthquake location microseismicity mid-ocean ridge seafloor spreading seismic array seismotectonics
DOI：
10.1111/j.1365-246X.2006.03308.x
被引量：
年份：
2010
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