1887

Abstract

We present a method for locating microseism hypocenters in both space and time, by correlating multiple reconstructed wavefields corresponding to different groups of receivers. The method is mathematically and conceptually similar to triangulation, but does not require arrival picking. The fundamental idea is that for correct velocity for the wavefield from all receivers arrives at the spatio-temporal location for the microseism simultaneously but on distinctly different paths. Thus, the wavefields for subsets of receivers do not coincide in space and time until the wavefields are at the hypocenter location. To capture the coincidence of the wavefields, we propose a new imaging condition for passive seismic datasets that is similar to the zero-lag cross correlation imaging condition but uses the cross-correlation of multiple receiver wavefields instead of the source and receiver wavefields. We demonstrate this idea on a synthetic microseismic dataset by reconstructing the wavefield using time-reversed propagation for a few groups of receivers that have distinctly different angular aperture and then applying the proposed imaging condition. This method is able to correctly image the microseisms in space and time, even though the signal-to-noise ratio is low.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.20149022
2011-05-23
2021-11-27
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20149022
Loading
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error