Crustal structure study is important to understand the features of the tectonic plates and for accurate hypocenter determination. The aim of this study is to analyze the crustal structure beneath SMPP, ENPP and BATP stations which comes from the newly established broadband stations in the Philippines.
The stacked receiver functions (RFs) were calculated using extended-time multitaper technique with teleseismic data from 2012-2015. The transverse component receiver functions were inverted first to constrain strikes of the dipping interfaces. After the first inversion, radial components RFs were inverted with the strikes fixed at 35°, 120° and 290° back azimuths where most of the teleseismic events are concentrated to determine the crustal structure.
The resulting model of the SMPP station has a discontinuity at ~50km and is dipping eastward. This could be possibly the slab top the Eurasian plate. Moreover, the Moho discontinuity could be found at ~30-35 km. The model for the ENPP station has a big velocity jump that was present at ~20km, which could be the Moho discontinuity. The Moho beneath the BATP station was estimated at ~30-35 km. The crust beneath the ENPP station is thinner compared to the BATP and SMPP stations, which is due to the differences in their tectonic settings.
Keywords: Receiver function, Genetic algorithms