Using Ambient Noise to Invert for Structure beneath Okinawa Trough
Date Issued
2009
Date
2009
Author(s)
Fang, Hui-Yuan
Abstract
Abstract We use ambient noise technique(ANT) to study the shallow lithosphere of Okinawa Trough, because ANT would not be limited by the distribution of earthquakes and stations. It depends only critically on the geometrical spread of stations. Vertical-component time-series recorded from 19 broad-band stations have been correlated with one another to yield estimated Green’s functions. We sort out data if the coefficient correlation between all-stacked and per 20 days-stacked record that are over an a prior assigned threshold. We then stack again to get higher quality Green’s function. We filter them by a narrow band that is concentrated within 10 to 50 s period to compute the group velocity maps in order to execute the tomography, and obtain the inverse model, the model resolution, and the model covariance matrix by three ways of inversion. In the end, we discuss the ideal pattern of OBSs deployment enhance our understanding of the Okinawa Trough.
Subjects
tomography
Okinawa Trough
ambient noise technique
cross-correlation
Type
thesis
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