How I spent my summer vacation. By: Matthew Ludwig.

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Presentation transcript:

How I spent my summer vacation. By: Matthew Ludwig

GEM-2 and Geomagnetic Surveying at a Coalition Period Archeological Site Looking for “hidden treasures” in the GEM-2 and GM data sets collected at the LANL Archaeological Site #LA SAGE 2002 Matthew Ludwig Santa Fe, NM

Presentation Outline  GEM-2  The Raw Data  The Data & Processing  The Interpretation  GM  The Raw Data  The Data & Processing  The Interpretation  Comparisons & Conclusions

The GEM-2

Presentation Outline  GEM-2  The Raw Data  The Data & Processing  The Interpretation  GM  The Raw Data  The Data & Processing  The Interpretation  Comparisons & Conclusions

Step 1 Unprocessed GEM Data Low Frequency Real Component GEM-2 Data Processing

Presentation Outline  GEM-2  The Raw Data  The Data & Processing  The Interpretation  GM  The Raw Data  The Data & Processing  The Interpretation  Comparisons & Conclusions

Step 2 Linear Trend Removal GEM-2 Data Processing

Step 3 5 Pass Smoothing GEM-2 Data Processing

Step 4 Expanding the Scale GEM-2 Data Processing

Presentation Outline  GEM-2  The Raw Data  The Data & Processing  The Interpretation  GM  The Raw Data  The Data & Processing  The Interpretation  Comparisons & Conclusions

Low Frequency ~1000Hz In-Phase Quadrature GEM-2 Interpretation

Middle Frequency-5000Hz In-Phase Quadrature GEM-2 Interpretation

In-Phase Quadrature GEM-2 Interpretation High Frequency-15000Hz

Presentation Outline  GEM-2  The Raw Data  The Data & Processing  The Interpretation  GM  The Raw Data  The Data & Processing  The Interpretation  Comparisons & Conclusions

Geomagnetics

Presentation Outline  GEM-2  The Raw Data  The Data & Processing  The Interpretation  GM  The Raw Data  The Data & Processing  The Interpretation  Comparisons & Conclusions

Survey #1 6/28/02 N-S Northing (m) Easting (m) Field Strength (nT) STAKE 815

Survey #2 6/30/02 W-E Northing (m) Easting (m) Field Strength (nT) STAKE 2 40

W-E vs. N-S

Presentation Outline  GEM-2  The Raw Data  The Data & Processing  The Interpretation  GM  The Raw Data  The Data & Processing  The Interpretation  Comparisons & Conclusions

Step 0 – Raw Data (SD) Data Point (distance) Field Strength (nT) x 10,000

Step 0 – Raw Data (SD) Y=mx+b Data Point (distance) Field Strength (nT) x 10,000

Step 1 Removal of Trend (SD) Data Point (distance) Field Strength (nT) x 10,000

Step 2 – FFT to Frequency Domain Log Plot (FD) Frequencies Log Field Strength (nT) x 10,000 Nyquist Frequency +LOW- +High-

Step 3 – Log plot of the Results of Bandpass Filter in Frequency Domain Frequencies Log Field Strength (nT) x 10,000

Finally – Bandpass filtered data Data Point (distance) Field Strength (nT) x 10,000

Comparing Filtered Results Line 8-1Line 40-2

Presentation Outline  GEM-2  The Basics  The Data & Processing  The Interpretation  GM  The Basics  The Data & Processing  The Interpretation  Comparisons & Conclusions

GEM-2 (LF) vs Magnetics (NS)

STAKE MN

Conclusions Both data sets turned out to appear more meaningful after filtering Low Frequency GEM-2 and Magnetics Plots show obvious similarities Surface structure correlations are more apparent in the GM data It will be interesting to see the results of the excavation study