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| Titel |
Topographic amplification across a taiwanese ridge |
| VerfasserIn |
Claire Rault, Patrick Meunier, Arnaud Burtin, Odin Marc, Vvn Weian Chao, Yih-Min Wu, Niels Hovius |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250129404
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| Publikation (Nr.) |
 EGU/EGU2016-9513.pdf |
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| Zusammenfassung |
| A line of 6 broadband seismometers have been deployed across a ridge in the Hualien County
(Eastern Taiwan) in order to study topographic amplification. Since March 2015, the network
has been continuously recording waves incoming from the Taiwanese regional seismicity.
The hill is well approximated by a triangular topography of 3600m in length by 900m in
height. We present a preliminary analysis performed over a dozen of earthquakes selected
from the Seismic Taiwanese catalog (CWBSN). We show that most of the Uphill records
exhibit a systematic amplification of seismic waves (peak to peak of particle velocity) in the
relevant frequency band [0.5-2Hz]. By contrast, energy within the larger frequency band
[6-20Hz] reflects local site effects induced by the soil layer. We report amplification ratios
ranging from ranging from 1.2 to 3 and from 1.8 to 4 for P and S waves respectively. We
show that amplification processes at the top strongly depend on the parameter α defined as
the angle between the azimuth of incoming wave and the azimuth of the ridge divide. |
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