Evaluation of Ambient Noise Green’s Functions Using Synthetic Ground Motions

Santiago Rabade, Leonardo Ramirez-Guzman, Alan Juarez, & Jorge Aguirre

Published August 15, 2016, SCEC Contribution #6858, 2016 SCEC Annual Meeting Poster #234

One of the recent topics of discussion in ambient noise processing is the reliability and validation of the Green's Functions obtained using cross-correlation techniques. We compared the latter against synthetic seismograms computed for reported velocity models. The data utilized for this comparison and validation process was gathered from a dense array deployed during 2014 in northern Mexico. We processed the three-component 10Hz geophones array recordings for six hours to obtain Green’s functions based on noise cross-correlation. On the other hand, we built a 3D velocity model considering reflectors and P- and S-wave velocities reported from the active source and Spatial Autocorrelation experiments, respectively. Using the model we computed synthetic seismograms with the Carnegie Mellon Finite Element Toolchain, Hercules (Tu et al., 2006). Preliminary results show agreement between the ambient noise-based Green's functions and the synthetic seismograms in different frequency ranges.

Key Words
Dense array, Ambient Noise, Validation, Ground Motion Simulation

Citation
Rabade, S., Ramirez-Guzman, L., Juarez, A., & Aguirre, J. (2016, 08). Evaluation of Ambient Noise Green’s Functions Using Synthetic Ground Motions. Poster Presentation at 2016 SCEC Annual Meeting.

Related Projects & Working Groups
Seismology