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Presentation of the Master's Thesis: Relocation of seismicity in the Eifel based on a Minimum-1-D-model

Presentation of the Master's Thesis: Relocation of seismicity in the Eifel based on a Minimum-1-D-model
Datum:

08.01.2019

Referent:

Julian Bühler

Abstract

In seismic tomography, a Minimum-1-D model ist often used as an initial reference model for a 3-D-inversion. In this study, a Minimum 1-D model was set up for the the region of the Eifel in Rhineland-Palatinate with the inversion program VELEST. With this program a 1-D inversion of velocitiy and hypocentral parameters is possible by introducing a lateral homogeneous velocity model. As input data, routine locations of the EDS (Erdbebendienst Südwest) of local earthquakes in the area of the Eifel were used.

By introducing the input data, consisting of the observation times and the hypocentral parameters for each event together with the velocity model parameters, the output of the inversion are changed hypocentral and velocity parameters. Additionally, an inversion for station corrections can be conducted, which account for the lateral variations of the velocity field from the lateral homogeneous velocity model.

The station corrections together with the resulting velocity model represent the Minimum-1-D model. We discuss the results by comparing the improved earthquake locations with the routine locations and by comparing the station corrections with the regional geological setting.