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Examination of shallow and deep S-wave velocity structures from microtremor array measurements and receiver function analysis at strong-motion stations in Kathmandu basin, Nepal
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| Title: | Examination of shallow and deep S-wave velocity structures from microtremor array measurements and receiver function analysis at strong-motion stations in Kathmandu basin, Nepal |
| Authors: | Shigefuji, Michiko Browse this author | | Takai, Nobuo Browse this author →KAKEN DB | | Bijukchhen, Subeg Man Browse this author | | Timsina, Chintan Browse this author | | Bhattarai, Mukunda Browse this author |
| Keywords: | Kathmandu basin | | Strong-motion record | | Receiver function analysis | | Microtremor array measurements | | VS30 |
| Issue Date: | 13-May-2024 |
| Journal Title: | Earth, Planets and Space |
| Volume: | 76 |
| Issue: | 1 |
| Start Page: | 72 |
| Publisher DOI: | 10.1186/s40623-024-02020-9 |
| Abstract: | The Himalayan collision zone, where the Indian Plate subducts beneath the Eurasian Plate at a low angle, has caused
many devastating earthquakes. The Kathmandu basin, situated in this region, is surrounded by mountains on all sides
and is filled with distinct soft lake sediments with a highly undulating bedrock topography. The basin has been experi-
encing rapid urbanization, and the growing population in its major cities has increased the vulnerability to seismic risk
during future earthquakes. Several strong-motion stations have recently been deployed in the Kathmandu basin. It
is expected that the data captured by this strong-motion station array will further enhance our understanding of site
amplification in sedimentary basins. Clear P-to-S converted waves have been observed in the strong-motion records.
In this study, we investigate the medium boundary that generated these converted waves. First, we estimate the shal-
low velocity structures, which correspond to the topographic slopes or surface geology, beneath the strong-motion
stations. We then apply a receiver function analysis to the strong-motion records. The receiver function indicates
that the interface between the soft sediment and seismic bedrock serves as a boundary that generates converted
waves. The obtained results can be used for tuning three-dimensional velocity structures. |
| Rights: | https://creativecommons.org/licenses/by/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/92320 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 高井 伸雄
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