Seismograph Cloth

A taut cloth, pinned along its border, struck by a week of real earthquakes. Each quake lands where its longitude and latitude fall on the fabric, with a downward tug scaled to its magnitude, so the whole planet's seismicity replays as ripples.

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Chapter 6 (Physics). A verlet cloth used as a seismograph. Each earthquake strikes a point set by its longitude (column) and latitude (row); the downward impulse scales with magnitude, normalized to the week's range so it is always visible. Threads color by strain, blue at rest and orange where a passing ripple stretches them.

Data: USGS Earthquake feed, all M2.5+ past 7 days, replayed by timestamp (public, no key).