Characteristics of a downhole seismicsparker source and vertical seismicprofiling investigation of firn onhardangerjokulen ice cap, Norway
Başlık çevirisi mevcut değil.
- Tez No: 716422
- Danışmanlar: Belirtilmemiş.
- Tez Türü: Yüksek Lisans
- Konular: Jeofizik Mühendisliği, Geophysics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2020
- Dil: İngilizce
- Üniversite: University of Leeds
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 128
Özet
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Özet (Çeviri)
A new SH-wave borehole source, Geotomographie BIS-SH-DS, was used to conduct a multi-component vertical seismic profiling survey on Hardangerjokulen ice cap in 2019, aiming to test the source and investigate the seismic velocities within the shallow firn structure (up to 11 metres). Using the collected data, the characteristics of the source were investigated in terms of its repeatability and radiation pattern. The comparison of repeated shots indicated a high source repeatability with no evident trigger error observed as a cross-correlation time-lag, highly similar waveform production that have a minimum predictability of 88.2 %, reaching up to 100.0 %, and very low normalized root-mean-square differences between 5.3 % and 47.7 %. The radiation pattern was investigated by separating different body waves by coordinate rotation based on polarization analysis. The results indicated that the major SH-wave radiation axis was deviating from the determined shooting direction with a median angle of 30o , and the P-wave radiation axis was approximately perpendicular (median difference of 87.3o ) to the SH-wave radiation axis. The radiation pattern was not thoroughly studied on the vertical plane, yet it was deduced that the near-vertical radiation was weak and a minimum 14o incidence angle is required to acquire a good signal to noise ratio. The shallow seismic velocities were estimated using 2.5-metre offset receiver gathers and were compared to density derived velocities. The results indicated a rapid P-wave and SH-wave velocity increase between 1-metre and 4-metre depths from approximately 1000 m/s to 2000 m/s and 600 m/s to 1100 m/s respectively. After 4-metre depth, the velocities were found highly dependent on the thin ice layers within the firn, where P-wave velocities were peaking around 3400 m/s and SH-wave velocities were peaking around 1800 m/s. Although the methodology introduced broad error bounds, the results were compatible with the density derived velocities.
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