A Further Application of the Cepstral Stacking Method to Determine Focal Depths of Marsquakes

Date: 4/25/2019

Time: 06:00 PM

Room: Fifth Avenue

The Cepstral Stacking Method (CSM) was originally developed by Shelton S. Alexander providing accurate focal depth estimations (+/- 1 km or typically better) from one or more regional stations. The method was tested over single stations as well as seismic arrays around the world. For single station case, the cepstrums of a moving window in time domain, with an appropriate overlap percentage, capturing the depth phases pP and sP within P to S arrival time range were stacked. The final stacked cepstrum resulted in an enhanced peaks of the depth phases. We intend to extend use cases for the CSM by including Mars, following the successful deployment of a single seismic station on the planet’s surface in December 2018 within the scope of NASA InSight mission. We currently test the method’s capabilities using marsquake synthetics that were computed using Instaseis and AxiSEM. Our preliminary results show that the CSM can effectively be used for determining the focal depths of the marsquakes recorded by a single seismic station. In this study, we will present single station examples using martian synthetic seismograms with superimposed realistic noise for a range of seismic events, in an effort to promote the CSM approach as one of the standard tools for locating quakes on Mars in the future.

Presenting Author: Recep Cakir

Authors