Magnetotelluric Interpretation of La Bajada Canyon Jeremy Gunter SDSU SAGE 2004.
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Transcript of Magnetotelluric Interpretation of La Bajada Canyon Jeremy Gunter SDSU SAGE 2004.
![Page 1: Magnetotelluric Interpretation of La Bajada Canyon Jeremy Gunter SDSU SAGE 2004.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bf931a28abf838c8f922/html5/thumbnails/1.jpg)
Magnetotelluric Interpretation of La Bajada
Canyon
Magnetotelluric Interpretation of La Bajada
Canyon
Jeremy Gunter
SDSU
SAGE 2004
![Page 2: Magnetotelluric Interpretation of La Bajada Canyon Jeremy Gunter SDSU SAGE 2004.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bf931a28abf838c8f922/html5/thumbnails/2.jpg)
Topics of InvestigationTopics of Investigation
Brief Overview of MT Instrumentation Study Area 1D and 2D Interpretations Implication of Interpretation
![Page 3: Magnetotelluric Interpretation of La Bajada Canyon Jeremy Gunter SDSU SAGE 2004.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bf931a28abf838c8f922/html5/thumbnails/3.jpg)
What is Magnetotellurics?
What is Magnetotellurics?
MT = The Study of Naturally Occurring E and H Fields at Surface of Earth to Map the Subsurface
Assumption of Normally Incident Plane Wave Sources: Solar Winds, Lightning Discharge, and
Active Sources
![Page 4: Magnetotelluric Interpretation of La Bajada Canyon Jeremy Gunter SDSU SAGE 2004.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bf931a28abf838c8f922/html5/thumbnails/4.jpg)
InstrumentationInstrumentationGeometrics Stratagem EH4
Provides 2D MT data Frequency: 10hz to 92k Hz, Controlled Source Capability for Natural Source MT
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Study AreaStudy Area La Bajada Fault Zone on Cochiti Pueblo Land
![Page 6: Magnetotelluric Interpretation of La Bajada Canyon Jeremy Gunter SDSU SAGE 2004.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bf931a28abf838c8f922/html5/thumbnails/6.jpg)
1D Interpretation1D Interpretation Force 3D World into 1D Model Implications = Earth is a Heterogeneous Half-Space Layered Homogeneous Half-Space Allows for Skin
Depth: Depth of Investigation = then
if then at 10hz or T=0.1 for Homogeneous Half-Space
Τ≅ ρδ 5.0
m*100Ω=ρm*5Ω=ρ m353≅δ
km58.1≅δ
![Page 7: Magnetotelluric Interpretation of La Bajada Canyon Jeremy Gunter SDSU SAGE 2004.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bf931a28abf838c8f922/html5/thumbnails/7.jpg)
La Bajada SoundingsLa Bajada Soundings
![Page 8: Magnetotelluric Interpretation of La Bajada Canyon Jeremy Gunter SDSU SAGE 2004.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bf931a28abf838c8f922/html5/thumbnails/8.jpg)
La Bajada SoundingsLa Bajada Soundings
![Page 9: Magnetotelluric Interpretation of La Bajada Canyon Jeremy Gunter SDSU SAGE 2004.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bf931a28abf838c8f922/html5/thumbnails/9.jpg)
La Bajada’s 1D WorldLa Bajada’s 1D World
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La Bajada’s 1D World…La Bajada’s 1D World…
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Analysis of 1D DataAnalysis of 1D Data 2 to 3 Major Resolvable Layers
Line 100 to ~400 = R,C,RLine 500 to 800 = Small R, Large C
Resistivity Change from ~100 ohm-m to ~10 ohm-m What could this mean?
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La Bajada in 2DLa Bajada in 2D
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Profile of 2D InversionProfile of 2D Inversion
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Implications and Improvements
Implications and Improvements
Successful Location of La Bajada Fault, and Possibly Another Fault???
Layer Determination, and Water Table Interface More MT Stations to the West Use Lower Frequencies