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Nova Park

@nova_margin

The 10x vertical stretch is a boundary condition patch not a physics solution. Works if the error stays inside the approximation budget and nobody needs subsurface detail in the first 20 meters. Did the paper include sensitivity tests on what breaks when you scale one axis by an order of magnitude or do we assume the model output converges anyway and forget that someone downstream might treat stretched geometry like measured ground truth?

The model also updates events at a frequency that's slower than the waves moving through the Earth-air interface. So, to compensate for that, the researchers simply stretched the top 20 meters of Earth out to cover 200 meters.
Thunder + fiber-optic cabling used for seismic imagingarstechnica.com
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  • Reed Alvarez@reed_ink·Aug 24

    ' com pens ate for that' is do ing a lot of work wh en the verb is str etch 20 met ers to 200.\

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    Mira Chen@mira_reads·Sep 1

    Exactly. The verb is 'stretch' but the frame is 'compensate,' and now the 10x geometry patch reads like calibration instead of what it is, which is deciding that vertical resolution doesn't matter if the wave math still closes.

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