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| 題名: | Anatomy of the high-frequency ambient seismic wave field at the TCDP borehole |
| 作者: | 馬國鳳;Hillers, G.;Campillo, M.;Lin, Y.-Y.;Ma, K.-F.;Roux, P. |
| 貢獻者: | 地球科學學院地球科學學系 |
| 關鍵詞: | ambient seismic wave field;borehole noise;Boreholes;cultural noise;Earth Sciences;Earth, ocean, space;Earthquakes;Exact sciences and technology;Geology;Geophysics;noise propagation;noise sources;Physical properties;Rocks;Sciences of the Universe;Seismic activity;Seismic waves;Seismology |
| 日期: | 2012-06-01 |
| 上傳時間: | 2026-04-23 11:29:22 (UTC+8) |
| 出版者: | Wiley-Blackwell;Washington, DC: Blackwell Publishing Ltd |
| 摘要: | 摘要： The Taiwan Chelungpu‐fault Drilling Project (TCDP) installed a vertical seismic array between 950 and 1270 m depth in an active thrust fault environment. In this paper we analyze continuous noise records of the TCDP array between 1 and 16 Hz. We apply multiple array processing and noise correlation techniques to study the noise source process, properties of the propagation medium, and the ambient seismic wave field. Diurnal amplitude and slowness patterns suggest that noise is generated by cultural activity. The vicinity of the recording site to the excitation region, indicated by a narrow azimuthal distribution of propagation directions, leads to a predominant ballistic propagation regime. This is evident from the compatibility of the data with an incident plane wave model, polarized direct arrivals of noise correlation functions, and the asymmetric arrival shape. Evidence for contributions from scattering comes from equilibrated earthquake coda energy ratios, the frequency dependent randomization of propagation directions, and the existence of correlation coda waves. We conclude that the ballistic and scattered propagation regime coexist, where the first regime dominates the records, but the second is weaker yet not negligible. Consequently, the wave field is not equipartitioned. Correlation signal‐to‐noise ratios indicate a frequency dependent noise intensity. Iterations of the correlation procedure enhance the signature of the scattered regime. Discrepancies between phase velocities estimated from correlation functions and in‐situ measurements are associated with the array geometry and its relative orientation to the predominant energy flux. The stability of correlation functions suggests their applicability in future monitoring efforts. Key Points TCDP borehole ambient wave field is controlled by a cultural source process The ballistic and scattered propagation regime coexist Correlation functions help discriminate source and medium effects
其他題名： J. Geophys. Res
出版者： Washington, DC: Blackwell Publishing Ltd
出版日期： 2012-06
出處： Journal of Geophysical Research, 2012-06, Vol.117 (B6), p.n/a
資源來源： Wiley Online Library - AutoHoldings Journals
版權： Copyright 2012 by the American Geophysical Union
版權： 2015 INIST-CNRS
版權： licence_http://creativecommons.org/publicdomain/zero
識別號： ISSN: 0148-0227
識別號： ISSN: 2169-9313
識別號： ISSN: 2156-2202
識別號： EISSN: 2156-2202
識別號： EISSN: 2169-9356
識別號： DOI: 10.1029/2011JB008999 |
| 顯示於類別: | [地球科學學系] 期刊論文
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