Investigation of crustal structure in Nias Island, Sumatra using P-wave receiver function analysis

Frilla R.T. Saputra, Syuhada Syuhada, Titi Anggono, Mohammad S. Rosid

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In this study, we invert the receiver function beneath GSI seismic station to estimate the crustal structure beneath Nias Island, Sumatra. The receiver function is computed from 24 teleseismic events using a time-domain deconvolution technique and divided into three groups by observations with similar back azimuth namely GSI_NW, GSI_NE, and GSI_SE. The resulted receiver function then stacked to increase the signal-to-noise ratio. The shear wave velocity structures of the crust are obtained by inverting receiver functions using linearized-iterative inversion with A0K-135 for the initial model. The inversion result shows a thick sediment layer ranged from 1 to 3 km with velocities around 2,4 km/s near the surface. The Moho and the top of the subducting oceanic slab are observed around 22-24 km and 32 km depth respectively. The low shear wave velocity above the transition to the subducting slab is suggested as the signature of the serpentinization.

Original languageEnglish
Title of host publicationProceedings of the 5th International Symposium on Frontier of Applied Physics, ISFAP 2019
EditorsMuhandis Shiddiq, Andri Hardiansyah, Witha Berlian Kesuma Putri, Yuliati Herbani, Edi Kurniawan, Deni Khaerudini, Ahmad Nugraha, Syuhada Syuhada, Hamzah Fauzi, Abdulloh Rifai, Edi Suprayoga, Anggito Tetuko, Toto Sudiro
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735420168
DOIs
Publication statusPublished - 3 Sep 2020
Event5th International Symposium on Frontier of Applied Physics, ISFAP 2019 - Tangerang Selatan, Indonesia
Duration: 23 Oct 201924 Oct 2019

Publication series

NameAIP Conference Proceedings
Volume2256
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference5th International Symposium on Frontier of Applied Physics, ISFAP 2019
CountryIndonesia
CityTangerang Selatan
Period23/10/1924/10/19

Keywords

  • Crustal Structure
  • Receiver Function
  • Serpentinization
  • Sumatra

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