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Seisma
The Gutenberg–Richter Law Physics
Size guide S–5XL · inches
Seisma strikes the fault line and sends out a staircase of cracks: many small ones, few large ones, each step rarer than the last.
The Physics
Beno Gutenberg and Charles Richter found in 1944, for California earthquakes, that the number of quakes at or above a magnitude falls off exponentially with magnitude. The constant a sets a region's overall activity; the slope b is typically close to 1, so each step up in magnitude is about ten times rarer.
log₁₀ N = a − bM
- N: number of quakes of magnitude M or more
- M: magnitude
- a: regional activity constant
- b: slope, usually near 1
Gutenberg & Richter, “Frequency of earthquakes in California”, Bull. Seismol. Soc. Am. 34, 185 (1944).
Honest caveat: b is not universal: about 0.8–1.2 is a common range for tectonic quakes, and volcanic or induced swarms can differ more. The power law is often linked to self-organised criticality, but that is debated.
On the shirt
Front: Seisma, the pixel-art character, with “TEN TIMES RARER”. Back: the Gutenberg–Richter law, the ten-times-rarer rule, the regional range of b and the 1944 paper. Printed on a unisex tee.
Shipping calculated at checkout by destinationMade to order, ships in 2–5 business days
Details
Size & fitS–5XL
Unisex heavy cotton (Gildan 5000), classic fit.
| Size | Width | Length | Sleeve |
|---|---|---|---|
| S | 18 | 28 | 15.1 |
| M | 20 | 29 | 16.5 |
| L | 22 | 30 | 18 |
| XL | 24 | 31 | 19.5 |
| 2XL | 26 | 32 | 21 |
| 3XL | 28 | 33 | 22.4 |
| 4XL | 30 | 34 | 23.7 |
| 5XL | 32 | 35 | 25 |
För skalans skull: storlek M är 20 in (50.80 cm) bred, ungefär 3.143 × 1034 Plancklängder (lP = 1.616255 × 10−35 m). Ett måttband går snabbare.
Measurements in inches, ±1.5 in tolerance.
ShippingBy destination
Shipping calculated at checkout by destination. Printed to order for you.
Returns & replacements21 days
Every item is printed to order, so we can’t accept returns or exchanges for change of mind, or if you ordered the wrong size or colour.
Print defect, misprint, damage or the wrong item? We’ll send a free replacement, or a refund if you prefer. Report it within 21 days of delivery with a photo; no need to send it back.
Field notes
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