PEMODELAN NUMERIK FINITE DIFFERENCE 2D UNTUK PERAMBATAN GELOMBANG P-SV DALAM MEDIUM HETEROGEN ELASTIK MENGGUNAKAN GRAPHICS PROCESSING UNIT: STUDI KASUS TOPOGRAFI GUNUNG MERAPI, YOGYAKARTA
| Main Authors: | , THEODORUS PERMANA, , Sudarmaji, M.Si. |
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| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2013
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/126413/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=66633 |
Daftar Isi:
- A numerical modelling of P-SV wave propagation in elastic heterogeneous medium has been done using fourth order finite-difference method. The model was created from topographical profile of Mount Merapi, where 200 meters thick lowvelocity layer has been added. The computation was performed using an NVIDIA graphics card. Synthetic seismograms was recorded at three receiver stations and was obtained by using a deep seismic source and a shallow seismic source located within the volcano. Results shows significant differences of wave propagation in presence of topography and low-velocity layer, while compared to the homogeneous version of the model which excludes the low-velocity layer. The formation of surface wave is also proved to significantly affect the recorded seismograms. Topography, low-velocity layer located at near-surface, and generated surface wave are suspected to be responsible for the complexity of the recorded seismograms. Compared to computation by using only CPU, usage of NVIDIA GPU proved to be successfully accelerate the execution time by 23 times.