Jeff Moore
@utahgeohaz.bsky.social
Professor, Geomorphology, Seismology, Rock Mechanics. Translator of seismic soundscapes.
Resonance frequencies are in the range of 0.5-4 Hz, with damping ratios of 1-2%. Results describe material properties needed for hydrodynamic or other stability analyses, and come from purely nondestructive ambient seismic data.
October 22, 2025 at 2:57 PM
Resonance frequencies are in the range of 0.5-4 Hz, with damping ratios of 1-2%. Results describe material properties needed for hydrodynamic or other stability analyses, and come from purely nondestructive ambient seismic data.
Saguaros vibrate much like a cantilever, but with some interesting differences. Stiffness varies between cacti (taller stems are stiffer), and for a single stem (taller stems have softer tops).
October 22, 2025 at 2:56 PM
Saguaros vibrate much like a cantilever, but with some interesting differences. Stiffness varies between cacti (taller stems are stiffer), and for a single stem (taller stems have softer tops).
240 m runup gives a minimum velocity estimate of 69 m/s!
May 29, 2025 at 2:55 PM
240 m runup gives a minimum velocity estimate of 69 m/s!
Unfortunately no, it's an older photo :)
May 23, 2025 at 9:43 PM
Unfortunately no, it's an older photo :)
I like it, and have another for you in the same spirit: Harvard Glacier in PWS AK, an oddball advancing glacier mowing down the forest on the fjord walls (larger background glacier obv!)
March 21, 2025 at 3:35 PM
I like it, and have another for you in the same spirit: Harvard Glacier in PWS AK, an oddball advancing glacier mowing down the forest on the fjord walls (larger background glacier obv!)
Whoa, fantastic super-elevation indiactors! When did it happen, known?
March 11, 2025 at 12:50 AM
Whoa, fantastic super-elevation indiactors! When did it happen, known?
A helicopter for sure, and specifically a three-blade helicopter! The infrasound frequency is simply the number of blades times the revolution rate of the main rotor, and is typically around 20 Hz for three blade helicopters. Doppler shifted thereafter
February 21, 2025 at 2:05 PM
A helicopter for sure, and specifically a three-blade helicopter! The infrasound frequency is simply the number of blades times the revolution rate of the main rotor, and is typically around 20 Hz for three blade helicopters. Doppler shifted thereafter
Love that "bite" out of the Matterhorn NW ridge, the scarp of a mountain shaping rockslide (albeit with no identified deposit)
February 4, 2025 at 9:28 PM
Love that "bite" out of the Matterhorn NW ridge, the scarp of a mountain shaping rockslide (albeit with no identified deposit)