Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 44, Issue 2, Pages 845-853Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL071452
Keywords
GPS; block rotation; toroidal flow; Calabrian Subduction system; rollback; tear fault
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Dense GPS observations can help Earth scientists to capture the surface imprint of mantle toroidal flow at slab edges. We document this process in the Calabrian subduction system, where the Ionian slab rollback took place during the past 30Ma, following a stepwise process driven by migration of lithospheric tearing. We found rotation rates of similar to 1.29 degrees/Ma (counterclockwise) and similar to 1.74 degrees/Ma (clockwise), for poles located close to the northern and southern slab edges, respectively. These small-scale, opposite rotations occur along complex sets of active faults representing the present-day lithospheric expression of the tearing processes affecting the southeastward retreating Ionian slab at both edges. The observed rotations are likely still young and the process more immature at the northern tear, where it is unable to reorient mantle fabric and therefore is unseen by SKS splitting.
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