Spatial variations of effective elastic thickness of the lithosphere in Central America and surrounding regions

As a proxy for long-term lithospheric strength, the effective elastic thickness ( T e ) can be used to understand the relationship between lithospheric rheology and geodynamic evolution of complex tectonic settings. Here we present, for the first time, high-resolution maps of spatial variations of T e in Central America and surrounding regions from the analysis of the coherence between topography and Bouguer gravity anomaly using multitaper and wavelet methods. Regardless of the technical differences between the two methods, there is a good overall agreement in the spatial variations of T e recovered from both methods. Although absolute T e values can vary in both maps, the qualitative T e structure and location of the main T e gradients are very similar. The pattern of the T e variations in Central America and surrounding regions agrees well with the tectonic provinces in the region, and it is closely related to major tectonic boundaries, where the Middle American and Lesser Antilles subduction zones are characterized by a band of high T e on the downgoing slab seaward of the trenches. These high T e values are related to internal loads (and in the case of the southernmost tip of the Lesser Antilles subduction zone also associated with a large amount of sediments) and should be interpreted with caution. Finally, there is a relatively good correlation, despite some uncertainties, between surface heat flow and our T e results for the study area. These results suggest that although this area is geologically complex, the thermal state of the lithosphere has profound influence on its strength, such that T e is strongly governed by thermal structure.