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Modellering av reflektionsseismiska mätningar omkring Kiruna-området
2013 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

In 2012, the Geological Survey of Sweden, SGU, initiated the Barent’s project in order to increase the amount of information that exists about the geology of unexplored areas in Sweden. One of the subprojects involved a seismic reflection survey carried out during the summer of 2012. The survey contained both Vibsist and explosive sources and the profile was 75 kilometers long, stretching eastward from the mining-town Kiruna. This project focuses on the data collected from the explosive sources and the aim is to process the data and to create models of the reflectors visible by using a ray tracing software. Three different softwares were needed for the processing: GLOBE Claritas was used to apply different types of filters and to pick arrival times of reflected rays from the seismograms; Matlab was used to plot time-distance graphs, apply time corrections, simplify the profile and to create simple 2D calculated models; and finally Rayinvr was used to create ray tracing models of the reflection data. The results show that the west side of the profile’s area contains greater amounts of reflective surfaces than the east side. By comparing the models with bedrock, magnetic, and gravity maps of the area, it is seen that the reflectors agree with the geological maps. The western part of the profile is characterized by eastward dipping reflectors originating from lithological boundaries. The eastern part is characterized by, to a large extent, seismic transparent bedrock, with a few reflectors that may be related to gabbro-granite contacts. At a depth of approximately 8 km there is a trend of horizontal reflectors, which most likely mark the border between Proterozoic rock and Archaean rock.

Place, publisher, year, edition, pages
2013. , 41 p.
Keyword [sv]
geofysisk modellering, reflektionsseismik, ray tracing
URN: urn:nbn:se:ltu:diva-58169Local ID: ec31640a-97f2-4a29-a6da-7236a87206efOAI: diva2:1031557
Subject / course
Student thesis, at least 15 credits
Educational program
Natural Resources Engineering, bachelor's level
Validerat; 20130129 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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