AMBIENT SEISMIC NOISE CORRELATION IN TWO DIMENSIONS

• Main Author: Ólafur Guðmundsson
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Iceland
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.610.7149; http://hraun.vedur.is/ja/jsr_2009/abstracts/pdf/olafur_gudmundsson_2.pdf

Ambient Seismic Noise Tomography (ASNT) has become a popular analysis method to study earth structure in recent years. The method is based on correlation analyses of ambient seismic noise measured at two seismographs (Shapiro et al., 2005). The correlation enhances from the stochastic noise those components which travel in line with the two stations. The correlogram can be used as a deterministic seismogram and measures of seismic velocity drawn from it. The method was recently applied by Gudmundsson et al. (2007) to data from the HotSpot experiment to study crustal structure in Iceland. The results prove the methods potential as they show a strong correlation with surface geology. However, the full potential is not exploited since more data can be incorporated, e.g. from the SIL network. The results are presented below as group velocity maps at three periods sensitive to the upper and middle crust in