Aso Caldera Magnetic Model

Load profiles, move corners (drag red), add corners (click yellow)

Notes:

1. The map shows the aeromagnetic anomaly over Aso caldera (the mouse shows UTM coordinates over the map)
2. The magnetic anomaly is due to magnetized caldera fill (welded ignimbrite) within and around the caldera.
3. Load individual magnetic profiles and change the location of the polygon edge (drag red corners) and add corners (click on yellow circles) to fit the calculated profile (red) to the observed profile (white).
4. Keep the model simple. You do not need to add more than 15 or so polygon corners. If the model crashes, reload the page. Crashes might happen depending on how your web-browser allocates memory. If it crashes a lot, close other applications and other web-pages.
5. You will not achieve a perfect fit because some of the magnetic anomaly is not associated with welded ignimbrite only (e.g., the Naka-dake vent also contributes to the anomaly).
6. Other model parameters can be adjusted (below). Experiment! But you do not need to adjust these parameters to achieve a reasonable fit.
7. The aeromagnetic data were collected at a flight elevation of approximately 1500 m above the ground surface. So depth to the top of the vertical-sided polygon should not be less than 1500 m (the ground surface).
8. Inclination and declination likely do not need to be changed. The magnetization might vary between 1 and 9 amp/m.
9. Click on the button to save (download) model data. Right click on the map to save the picture of your model.