Crustal velocity modeling beneath Simeulue Island derived from the inversion of receiver-function using neighborhood algorithm

We compute the receiver function of teleseismic earthquakes recorded at three temporary seismic stations in Simeulue Island. The seismic stations are spread from the northern coast to the southern coast of the island. The resulted receiver functions are then inverted to obtain the velocity structure beneath Simeulue Island using the neighbourhood algorithm approach. The inversion result shows that the sediment layer covers at the near-surface of the island with a velocity ranging from 1 to 2 km/s. The result also indicates the insertion of Sunda block continental crust underneath the island characterized by the slight increase of seismic velocity in the middle crust. The Moho discontinuity is identified at around 22-24 km depth, which is consistent with the Moho depth observed by the previous crustal studies.