Institutional Repository
Technical University of Crete
EN  |  EL

Search

Browse

My Space

Seismic tomography and DAS technology contribution to landslide imaging and monitoring

Akritidis Marios-Stylianos

Full record


URI: http://purl.tuc.gr/dl/dias/100B5CBF-0DA1-427B-8437-59E58055ABF5
Year 2018
Type of Item Diploma Work
License
Details
Appears in Collections

Summary

The present thesis examines the application of the new distributed acoustic sensing technology (DAS) and compares it with the conventional method of seismic tomography. More specifically, DAS technology is being studied and compared to the existing conventional seismic tomography technology, in the subsurface imaging for landslide monitoring.To achieve the above, a seismic refraction survey simulation was performed. A four-layer model corresponding to a geological section of the Bavarian Alps was used. The characteristics of this section have been determined by the combined interpretation of the ground-penetrating radar (GPR), electrical resistivity tomography (ERT) and seismic refraction (SR) methods.In particular, the interpreted geophysical section from the study area was digitized, and then the algorithm PSV_SYNTHETICS_VER11, developed in the Laboratory of Applied Geophysics of the Technical University of Crete in Matlab, was used to simulate the two-dimensional (2D) seismic tomography experiment. Synthetic data was generated for 5 different source locations along the model. Subsequently, the first arrivals were selected and processed using the SeisImager software (Plotrefa program). For the representation of the conventional method of seismic tomography and DAS technology, receivers spacing were set at 6m and 1m, respectively.In summary, it is concluded that the distributed acoustic sensing (DAS) is superior to conventional seismic tomography regarding the ability to distinguish the layers of the model. Fiber optics allows the detailed examination of the subsurface as it functions as an array of receivers located in very small distances. Additionally, the DAS methodology can be applied in cases where the implementation of conventional seismic tomography is impossible, for practical as well as economic reasons.

Available Files

Services

Statistics