Active faulting and rock uplift along the eastern Hellenic forearc in Greece: preliminary results from the islands of Crete, Kassos, Karpathos and Rhodes
Abstract
Coastal terraces and paleo-cliffs are the most common features to record vertical movements along active subduction margins. Vertical movements in such settings often reflect the net effect of multiple deformational processes that occur simultaneously at various depths of a subduction system and over different timescales. The eastern forearc of the Hellenic Subduction System includes a series of islands (eastern Crete, Kasos, Karpathos and Rhodes) that act as natural seismographs as they record large-magnitude earthquakes that originate both in the upper-plate and the subduction thrust. Indeed, these islands are traversed by active normal faults (that often extend offshore) while marine terraces (<1 Ma old) and marine sedimentary sequences (<2 Ma old) reach elevations of 500-1000 m a.s.l. Here we combine new (26) and published (54) empirical normal fault and paleoshoreline data from these islands to explore, respectively, possible fluctuations in their fault displacement rates and uplift rates through time. In doing so, we try to quantify the relative contribution of upper-plate normal faulting and subduction thrust earthquakes to rock uplift in the last <50 ka and identify, through numerical modeling, the dominant seismogenic sources.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2021
- Bibcode:
- 2021AGUFM.T25D0196V