| RICHTERSCALE | Measure of the magnitude of earthquakes (7,5) |
| RICHTER | - scale; rating of the magnitude of earthquakes based on seismograph oscillations (7) |
| CHARLESRICHTER | American seismologist who created a scale to measure the magnitude of earthquakes (7,7) |
| STRAIN | In mechanics, term for the magnitude of the deformation of an object, described in Hooke's law (6) |
| EXTREMITY | The magnitude of the limit (9) |
| SPEED | Measured on a gauge originally invented by Josip Belui, the general word for the magnitude of velocity (5) |
| LOUDNESS | The magnitude of sound (8) |
| MICROSCOPE | The magnitude of it is down to infinitesimal reach. (10) |
| AMPERAGE | Which term describes the magnitude of electric current (8) |
| SIZE | Sighs audibly at the magnitude of it (4) |
| MEASURES | Determines the magnitude of (8) |
| SWARMS | Dense bodies of flying bees, hence clouds of insects, crowds of people, showers of meteors, sequences of earthquakes or other myriads moving en masse (6) |
| POSEIDON | The god of the sea and of earthquakes in Greek mythology |
| SWARM | To climb by gripping with one's hands/feet; a throng of honey bees; a mass of bioluminescent krill, visible from space; a shower of meteors; or, a series of earthquakes (5) |
| SEISMOLOGY | Branch of geology concerned with the study of earthquakes (10) |
| SEISMIC | In the ice, miss cracking of earthquakes (7) |
| SEISMOGRAPH | What instrument measures the intensity of earthquakes? (11) |
| THREATENS | Warns of earthquakes, giving the figures too |
| QUAY | Stephen ___, stop-motion animated film director whose works with twin Timothy include 2005's The Piano Tuner of Earthquakes (4) |
| MERCALLI | ___ scale, Richter alternative measuring the intensity of earthquakes by their effect (8) |
