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| Titel |
Dynamic Surface Wave Tomography in the China North-South Seismic Belt from Ambient Seismic Noise |
| VerfasserIn |
X. Zhang, J. Liu, Z. Huang, Z. Yang, H. Shi, X. Wei, W. Yang, L. Zhou |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250058630
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| Zusammenfassung |
| The area of the China North-South seismic belt is characterized by high concentrations of shallow and intermediate depth seismicity in China, also is a natural laboratory for the geological and seismological studies. We collect continuous vertical-component seismograms, spanning the periods from October 1, 2009 to September 30, 2011 recorded by 293 broadband stations. After making instrument response calibration, de-meaning, de-trending, filtering, time-domain normalization and spectral whitening, we apply the cross correlation technique to ambient noise data for each station pairs of the North-South seismic belt array. We analyze the relationship between the SNR and the sum time, accumulate the cross correlation time series for each day and obtain 8 data sets of time series for each 3 months. Using the automatic frequency-time analysis, Rayleigh wave group velocity dispersion curves are measured. A 2-D surface-wave tomography method, is used to calculate 8 lateral variation sets in group velocity distribution at different periods in the range from 15 to 40s with a grid spacing of 1.0º× 1.0º. Analyzing the group velocity distribution, we obtain the preliminary recognization for the relationship between the deep structure and the seismicity.
The study is supported by the Chinese National Science Foundation (40804009) and CEA Spark Plan (XH1032). |
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