Imaging lithospheric discontinuities using the common-reflection-point-based prestack depth migration

Abstract:

In this abstract, we here present a further enhancement of the P-wave autocorrelogram method (Sun & Kennett, 2016) using teleseisms by exploiting common reflection point (CRP) depth migration and stacking. The idea of CRP-based prestack migration is similar to the CCP stacking technique (Dueker & Sheehan, 1997) for receiver function, while the former method utilize the constructed P-wave reflections or autocorrelograms rather than the primary phase and its conversions.

The newly proposed migration technique (Sun & Kennett, 2020) can track the lateral variations of lithospheric reflectors, which greatly improve the readabilities of high-frequency and high-resolution lithospheric images. The enhanced SDI approach including CRP-based prestack migration will be expected to a potentially standard tool to image fine-scale structures.

References

Dueker, K. G., & Sheehan A. F. (1997). Mantle discontinuity structure from midpoint stacks of converted P to S waves across the Yellowstone hotspot track, J. Geophys. Res. 102, 8313-8327.

Sun, Weijia, & Kennett, B. L. N. (2016). Receiver structure from teleseisms: Autocorrelation and cross correlation. Geophysical Research Letters, 43(12), 6234-6242.

Sun, Weijia, Kennett, B. L. N., (2020). Common-reflection-point-based prestack depth migration for imaging lithosphere in Python: Application to the dense Warramunga array in northern Australia, Seismological Research Letters, DOI：10.1785/0220200078.