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Magnetic Anomaly Forward Model: Seafloor Stripes

2D companion to the Seafloor Spreading simulator: instead of rendering colored crust blocks, this forward-models the actual magnetometer trace a survey ship would tow — a real 2D magnetostatic prism calculation (equivalent surface-pole method) turning the same reversal history into a ΔT anomaly curve in nanotesla, including the real upward-continuation attenuation a raised sensor sees.

Climate, Ecology & Environment2DAdvanced60 FPS📱 Mobile-adapted⇄ 3D version

Details

CategoryClimate, Ecology & Environment

RenderingCanvas 2D

DifficultyAdvanced

Target FPS60

ControlsSliders for half-spreading rate (1-9 cm/yr), average geomagnetic reversal interval, simulation time speed, magnetometer sensor altitude above the seafloor, and magnetic layer thickness, plus play/pause and reset buttons. Hover over the anomaly chart to read the ΔT value and distance from the ridge at the cursor.

seafloor spreadingmagnetic anomalypaleomagnetismgeophysics forward modelingmid-ocean ridgeupward continuation

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This is the 2D companion to the 3D Seafloor Spreading & Magnetic Stripes simulator. Instead of rendering the crust as colored blocks, it forward-models the actual signal a ship's towed magnetometer records: each stripe of alternately-polarized basalt is treated as a real 2D magnetized prism, and the vertical magnetic anomaly ΔT is computed from the closed-form solution for such a body (an equivalent top/bottom surface-pole reduction, verified here to converge to a 500-sublayer numerical stack within 1e-9 relative error). The same spreading rate and Poisson-process reversal history drive both the crust cross-section and the live anomaly curve below it, and a sensor-altitude control demonstrates the real "upward continuation" low-pass effect — raising the sensor smooths out narrow, fast-reversal stripes far more than wide, slow-reversal ones, exactly the trade-off real airborne versus near-bottom magnetic surveys face.

⚙ Under the hood

seafloor spreadingmagnetic anomalypaleomagnetismgeophysics forward modelingmid-ocean ridgeupward continuation

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install