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Authors: Obermann, Anne* 
Ruigrok, Elmer* 
Bianchi, Irene* 
Hetényi, Gyorgy* 
Title: Constraining the Moho Depth Below Bhutan With Global-Phase Seismic Interferometry
Journal: Frontiers in Earth Science 
Series/Report no.: /9 (2021)
Publisher: Frontiers Media S.A.
Issue Date: Dec-2021
DOI: 10.3389/feart.2021.658146
Abstract: We use a novel technique named global-phase seismic interferometry (GloPSI) to image the lithospheric structure, and in particular the Moho, below two parallel north-south transects belonging to the GANSSER network (2013–2014). The profiles cross the Himalayan orogenic wedge in Bhutan, a tectonically important area within the largest continent-continent collision zone on Earth that is still undergoing crustal thickening and represents a challenging imaging target for the GloPSI approach. GloPSI makes use of direct waves from distant earthquakes and receiver-side reverberations with near vertical incidence. Reflections are isolated from earthquake recordings by solving a correlation integral and are turned into a reflectivity image of the lithosphere below the arrays. Our results compare favorably with first-order features observed from a previous receiver function (RF) study. We show that a combined interpretation of GloPSI and RF results allows for a more in-depth understanding of the lithospheric structure across the orogenic wedge in Bhutan.
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