Local axial migration and spreading rate variations, East Pacific Rise, 31°S

Details Local axial migration and spreading rate variations, East Pacific Rise, 31°S Local axial migration and spreading rate variations, East Pacific Rise, 31°S

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..34...78r&link_type=abstract

Earth and Planetary Science Letters, Volume 34, Issue 1, p. 78-84.

Physics

4

Scientific paper

Mapping and analysis of marine magnetic anomalies generated during the past 3.78 m.y. at the East Pacific Rise crest near 31°S reveals a history of ongoing small-scale migration of the spreading center. The axis first became curved and then broke when the curvature became too severe, forming a 10-km offset. The offset healed rapidly and the topographic axis of the rise is now continuous and essentially linear. Sea-floor spreading has occurred asymmetrically in this area with east and west flank rates of 86 and 77 mm/yr, respectively, since 2.41 m.y. ago. Total spreading rates show an overall decline from 176 to 145 mm/yr prior to the Jaramillo event, 0.9 m.y. ago. For the last 0.7 m.y. the total spreading rate has been 162 mm/yr.

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