Buildings in Earthquakes: Why do some fall and others don't? (educational)

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www.iris.edu/earthquake for more animations
All buildings have a natural, period, or resonance, which is the number of seconds it takes for the building to naturally vibrate back and forth. The ground also has a specific resonant frequency. Hard bedrock has higher frequencies softer sediments. If the period of ground motion matches the natural resonance of a building, it will undergo the largest oscillations possible and suffer the greatest damage.
Dr. Robert Butler (Univ.Portland) gives demonstration of resonance.
Animation & graphics by Jenda Johnson, Earth Sciences Animated
Video demonstration by Dr. Robert Butler, University of Portland
Narrated by NappyT
Guitar solo by Dennis P. McNamara
Science editing by Dr. Robert Lillie (Oregon State University) and John Taber

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30 мар 2015

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Комментарии : 38

@Ciubowski Год назад

This video deserves more views.

@extraterrestrial7424 9 месяцев назад

Very well made video. Thanks to it, I learned that structures have a natural resonance frequency and how big of a difference it can make.

@marcidorman 2 года назад

Great video! Explanation, graphics, and demo were all very clear. Shared with my family (3 generations) and everyone found it interesting. I love being able to better understand why some types of building are devastated by an earthquake while others remained standing.

@kytddjj 2 года назад

@aashishp007 7 лет назад

The explanation has clarified all my doubts...Thanks a ton!!!!

@ngwilliam5619 2 года назад

Very clear demonstrations. Thx

@mvdmusicvideostorefreshthe3224 2 года назад

On the Tacoma's Narrow bridge something called 'Vortex Shedding' added to the problem. I love this video though, so thank you for providing it.

@NK-iy6if 2 года назад

God bless you ! Thank you so much the video has been incredibly helpful.

@haominghuang4990 6 лет назад

phenomenal, informative video

@simantsoren1120 4 месяца назад

I've learned a lot thanks

@valeriewedel2775 4 месяца назад

Awesome video - thanks! Bringing this to my commercial construction drawing class.

@AndrewNowacki 4 года назад

Great video.

@wpegley 3 года назад

Great video & thx.

@handedilhan 3 года назад

Thank you

@gehadyasser1001 5 лет назад

Super clear thnkss a lot

@anjalisuresh8896 4 года назад

Very helpful video

@mahendarreddy9862 2 года назад

Very nice video

@eeesss9593 4 года назад

great great great one.

@ranjithalluri604 9 месяцев назад

Excellent

@satishvenkata1214 2 года назад

SUPERB SIR

@deepakchacko5585 2 года назад

Superb

@fps8093 9 месяцев назад

wow amazing

@priyanshupatel2282 2 года назад

GREAT

@SunandGold 4 года назад

Thank you!!!!

@liboy9844 Год назад

But not much help if it boils down to luck on which building you’re in and what type of earthquake occurs.

@captain6198 2 года назад

Doesn't the frequency & its amplitude change according to the size of the earthquake? Surely that ground & building structure plays a key role in general durability against collapses, but what about the shockwaves? Surely a magnitude & destruction power of say 5.5 and 7.4 earthquakes can't be the same, also depth is another factor.

@mariannamakari9593 Год назад

They also change according to the types of soil that the wave meets on its way from the epicenter to the structure.

@deemarrero9 Год назад

Amazing video, well explained and graphics.. very important to know this, since with all the damages Human Race it's been doing to mother earth 🌍 Earthquakes like those in Turkish it will happening more frequently in the whole word.