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Data processing of Controlled Source Audio Magnetotelluric (CSAMT) Data
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
2019 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Data processering av Controlled Source Audio Magnetotelluric (CSAMT) data (Swedish)
Abstract [en]

During this project three distinct methods to improve the data processing of Controlled Source Audio Magnetotellurics (CSAMT) data are implemented and their advantages and disadvantages are discussed. The methods in question are:

Detrending the time series in the time domain, instead of detrending in the frequencydomain.

Implementation of a coherency test to pinpoint data segments of low quality andremove these data from the calculations.

Implementing a method to detect and remove transients from the time series toreduce background noise in the frequency spectra.

Both the detrending in time domain and the transient removal shows potential in improvingdata quality even if the improvements are small(both in the (1-10% range). Due totechnical limitations no coherency test was implemented. Overall the processes discussedin the report did improve the data quality and may serve as groundwork for further improvementsto come.

Abstract [sv]

Projektet behandlar tre stycken metoder för att förbättra signalkvaliten hos Controlled Source Audio Magnetotellurics (CSAMT) data, dessa implementeras och deras för- och nackdelar diskuteras. Metoderna som hanteras är:

Avlägsnandet av trender från tidsserier i tidsdomänen istället för i frekvensdomänen.

Implementationen av ett koherenstest för att identifiera ”dåliga” datasegment ochavlägsna dessa från vidare beräkningar.

Implementationen av en metod för att både hitta och avlägsna transienter (dataspikar) från tidsserien för att minska bakgrundsbruset i frekvensspektrat.

Både avlägsnandet av trender samt transienter visar positiv inverkan på datakvaliteten,även om skillnaderna är relativt små (båda på ungefär 1-10%). På grund av begränsningarfrån mätdatan kunde inget meningsfullt koherenstest utformas. Överlag har processernasom diskuteras i rapporten förbättrat datakvaliten och kan ses som ett grundarbete förfortsatta förbättringar inom området.

Place, publisher, year, edition, pages
2019. , p. 36
Keywords [en]
CSAMT, detrending, coherency, transients, time series, processing
Keywords [sv]
CSAMT, detrending, koherens, transienter, tidserier, processering
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-387246OAI: oai:DiVA.org:uu-387246DiVA, id: diva2:1332875
Subject / course
Geophysics
Educational program
Bachelor Programme in Physics
Presentation
2019-06-18, Geocentrum Dk235, 15:00 (English)
Supervisors
Examiners
Available from: 2019-06-29 Created: 2019-06-28 Last updated: 2019-06-29Bibliographically approved

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