I am Clara Gómez and I just started my PhD. I am working with Rayleigh wave ellipticity across the Iberian Peninsula and Morocco. Rayleigh waves are a type of seismic wave that propagate along the earth's surface and produce an elliptical motion of the ground. This ellipticity is therefore quite sensitive to the shallowest earth structure. Nowadays, tomography based on passive measurements of surface waves provides high-resolution images of the crustal and upper mantle however its geological and seismological utility is limited since models contribute with only weak constraints on uppermost crustal structure. It has been reported (Lin et al. 2012, Lin et al., 2014) that Rayleigh wave ellipticity improve imaging of upper crustal structure (<3 km).
In a preliminar study across the Iberian Peninsula and Morocco Rayleigh wave ellipticity matches well with superficial geological features: high ellipticity values (cool colours) in sedimentary basins as Guadalquivir basin and lower values (warm colours) in rock formations as Pyrenees, Iberian Massif or High Atlas.
Contribution of Rayleigh wave ellipticity in crustal imaging will lead us to a better understand of the relationship between geologic observation at the surface and deep crustal processes and allow for more accurate prediction of earthquake ground motion.
Contribution of Team Consolider-Ingenio 2010 TOPO-IBERIA (CSD2006-00041)
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| Rayleigh wave ellipticity across the Iberian Peninsula and Morocco for 30 seconds of period |
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