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These Lecture Notes cover the following aspects of Seismology : Magnetotellurics, Data, Interpretation, Northern, Part, Dense, Array, Regional, Map, Different
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Topic: Magnetotellurics
-‐ Several minute delay setting up computers -‐ Discussed Hill 2009 Paper o Figure 1 Discussed source of data for contours Perhaps previous data (Egbert & Booker) Seems to be a lot of interpretation for northern part, as main array is in southern part and only one station/measurement is in the northern part Not much data displayed in area of dense array to southwest Cut out size and scale do not appear to be exact with regional map. Sloppy? o Figure 2 Same Model – Different shading colors. Confusing Data shown in W. and S. portions not included in Figure 1 (i.e. no deep blue) Skew angle represents change just E of Mt. St. Helens, which indicates a potential magma source located between the three volcanoes o Figure 3 Color coding: Red = High conductivity Figure shows reservoir, but NOT deeper reservoir source Perhaps longer period source would reveal source. o Figure 4 Reservoir not clear/strong (i.e. not deep red) Inconsistent with Figure 3? Maybe data sensitivity issue Red at surface E of Adams. Potential water table? -‐ Discussed Patro 2008 o Figure 2 Figure summarizes main point of entire paper Used seismicity study to generate left figure & compared to their data. It agrees. Discussed Seletzia placement and apparent slab dip placement/angle. o Figure 3 Depth of peak similar for each province High conductivity at lower crust can potentially mask lower mantle Does C2 in Patro relate to Hill 2009 findings? It is possible, but wavelengths used in two studies not compatible, Hill data located between 2 Patro stations.
What is C1? Huge area. Paper says that this may be the result of magmatic underplating from Basin and Range extension. -‐ Compared the two papers. Patro starts to build image, but not much interpretation. Hill has more interpretation. -‐ Closed by exploring ideas on short timescale changes in MT results. Could you map a small scale fluid flow with MT?