"Emphasis was usually put on the horizontal acceleration factor, for the simple reason that ordinary structures have a built-in safety factor for the vertical component; that is, gravity"
About this Quote
Richter’s line lands with the dry snap of a lab-note turned punchline: engineers fixate on horizontal shaking not because they’re blind to physics, but because gravity has already done the boring bureaucratic work of regulation. Buildings, by default, are designed to carry weight straight down. The “vertical component” of an earthquake is, in a sense, already budgeted for in every beam and column. Horizontal acceleration is the troublemaker - the sideways shove that turns a well-behaved stack of loads into torsion, shear, and sudden collapse.
The wit is in how casually he demystifies a field that the public associates with terror and spectacle. “For the simple reason” pretends this is obvious, almost pedestrian. Then he drops the kicker: the safety factor is “gravity.” It’s a scientist’s joke, but it’s also an epistemological stance. Richter is arguing that risk isn’t just about measuring forces; it’s about understanding what systems quietly assume. Gravity is constant, predictable, and omnipresent, so it gets designed around. Earthquakes are intermittent and directionally chaotic, so they slip through the seams of convention.
Context matters: Richter helped standardize how we quantify earthquakes, and this quote reflects the pragmatic bridge between seismology and structural engineering. He’s pointing to a bias embedded in practice - not ideological, but infrastructural. The subtext is a warning against confusing “normal” with “safe.” We prepare obsessively for what everyday life rehearses; disasters exploit what everyday life lets us ignore.
The wit is in how casually he demystifies a field that the public associates with terror and spectacle. “For the simple reason” pretends this is obvious, almost pedestrian. Then he drops the kicker: the safety factor is “gravity.” It’s a scientist’s joke, but it’s also an epistemological stance. Richter is arguing that risk isn’t just about measuring forces; it’s about understanding what systems quietly assume. Gravity is constant, predictable, and omnipresent, so it gets designed around. Earthquakes are intermittent and directionally chaotic, so they slip through the seams of convention.
Context matters: Richter helped standardize how we quantify earthquakes, and this quote reflects the pragmatic bridge between seismology and structural engineering. He’s pointing to a bias embedded in practice - not ideological, but infrastructural. The subtext is a warning against confusing “normal” with “safe.” We prepare obsessively for what everyday life rehearses; disasters exploit what everyday life lets us ignore.
Quote Details
| Topic | Engineer |
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