Crustal and uppermost mantle structure variation beneath La Réunion hotspot track

摘要: The Piton de la Fournaise basaltic volcano, on La Reunion Island in the western Indian Ocean, is one of most active volcanoes world. This volcano classically considered as surface expression an upwelling mantle plume and its activity continuously monitored, providing detailed information superficial dynamics edifice structure. Deeper crustal upper structure under surprisingly poorly constrained, motivating this study. We used receiver function techniques to determine a shear wave velocity profile through crust uppermost beneath , but also at other seismic stations located hotspot track, investigate lithosphere interaction evolution time. Receiver functions (RFs) were computed permanent broad-band from GEOSCOPE network (on Rodrigues), IRIS MRIV DGAR installed Mauritius Diego Garcia islands, GEOFON KAAM HMDM Maldives. performed non-linear inversions RFs modelling P-to-S conversions various interfaces. Joint inversion RF dispersion data suggests much deeper Mohorovici´iscontinuity (Moho) (∼21 km) compared (∼12 km). A magmatic underplated body may be present thin layer (≤3 km thick), suggested by previous refraction study, thicker suggesting that underplating important process resulting plume–lithosphere interaction. find evidence for strikingly low starting about 33 depth we interpret zone partial melt volcano. finally observe velocities below 70 50 could represent base oceanic lithosphere.