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Originally posted by prof-rabbit
My greatest concern is the area from Oregon to BC, - overdue for a large quake, - lack of education, - dense housing in low lying areas, - historically prone to tsunami's - plus millions of unprepared Americans/Canadians.
Originally posted by MorgothaM
I don't know if my compatriots here have this info. Anyway here we go:
After a short conversation with a mechanical engineer, he told me that the University of Chile, install here in Santiago, 2 "speedometers" (i don't know if that is the right name of the equipment used), to measure the forces of earthquakes over the capital.
The measures, for the first time in the chilean history of earthquakes, evidence 2 components of forces working at the same time: vertical and horizontal forces with the same power, 8.8 in Richter scale.
Those types of movements, unusual for an earthquake until this new, cause a rare sensation like to ride a cow: up, down, forward and back. Literally.
Natural? Man made? How knows, for the science, the facts are over the table.
M.
PD: I'm sorry for my poor english
Originally posted by Jim.Hero
Originally posted by MorgothaM
I don't know if my compatriots here have this info. Anyway here we go:
After a short conversation with a mechanical engineer, he told me that the University of Chile, install here in Santiago, 2 "speedometers" (i don't know if that is the right name of the equipment used), to measure the forces of earthquakes over the capital.
The measures, for the first time in the chilean history of earthquakes, evidence 2 components of forces working at the same time: vertical and horizontal forces with the same power, 8.8 in Richter scale.
Those types of movements, unusual for an earthquake until this new, cause a rare sensation like to ride a cow: up, down, forward and back. Literally.
Natural? Man made? How knows, for the science, the facts are over the table.
M.
PD: I'm sorry for my poor english
Excelente Compatriota!
I didn't know that. And i think they used accelerometers though...
That would be a really good tool to measure vector displacements
Building and structural monitoring
Accelerometers are used to measure the motion and vibration of a structure that is exposed to dynamic loads[22]. Dynamic loads originate from a variety of sources including:
Human activities - walking, running, dancing or skipping
Working machines - inside a building or in the surrounding area
Construction work - driving piles, demolition, drilling and excavating
Moving loads on bridges
Vehicle collisions
Impact loads - falling debris
Concussion loads - internal and external explosions
Collapse of structural elements
Wind loads and wind gusts
Air blast pressure
Loss of support because of ground failure
Earthquake.