Constraining the Moho Depth Below Bhutan With Global-Phase Seismic Interferometry
- Author(s)
- Anne Obermann, Elmer Ruigrok, Irene Bianchi, György Hetényi
- 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.
- Organisation(s)
- Department of Meteorology and Geophysics
- External organisation(s)
- Eidgenössische Technische Hochschule Zürich, Royal Netherlands Meteorological Institute, Université de Lausanne
- Journal
- Frontiers in Earth Science
- Volume
- 9
- No. of pages
- 8
- ISSN
- 2296-6463
- DOI
- https://doi.org/10.3389/feart.2021.658146
- Publication date
- 04-2021
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105122 Seismic
- Keywords
- ASJC Scopus subject areas
- General Earth and Planetary Sciences
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/150eb2df-e7e9-43e1-b5fb-7106a72961ef