Right now we are merely
considering the possibility. Yet there
is plenty of merit because the seismic attack wave is normally constrained in
terms of wavelength anyway and does most of its damage through the length of
time the attack is sustained. A hundred
foot drop shock is converted into a longitudinal seismic wave that is largely
already controlled by the materials it is passing through. A hundred miles away, there is plenty of
energy release, but the release is dragged out.
Thus it makes good sense to
figure out building protocols that ameliorate the actual risk. In fact, there is plenty of evidence that
this is possible just noting the behavior of different ground profiles in quake
regions.
In short, it is time to rethink
the engineering and to become more proactive in terms of testing
protocols. We are actually doing pretty
good, but I suspect we can do vastly better.
I do know that it is easy to build housing able to handle a couple of
magnitudes more in terms of quake shock.
Unfortunately, no one will thank you for it unless it becomes the law of
the land.
Intangibility cloak could make buildings "invisible" to
earthquakes
Invisibility cloak research focuses on how to make light waves pass
through an object as though nothing is there. Now what if you took that same
basic principle and applied it to other types of waves — like those of
vibration?
That's the basic principle behind new research by University of Manchester
scientist Dr. William Parnell and his team. Their idea is to create what we
might call a cloak of intangibility, a device that makes vibration waves pass
right past the objects inside the cloak. If such a device existed, it could be
used to make valuable objects, including even entire buildings, virtually
invulnerable to natural disasters like earthquakes — or even coordinated
attacks by terrorists.
While light, sound, and vibration are obviously vastly different
phenomena, they are all waves, which means learning how to cloak one type of
wave could be immensely useful in cloaking the others. In a statement, Dr.
Parnell explains that the particularly problem of cloaking vibration waves is
finding the right materials for the cloak - naturally occurring materials
simply can't shield sound or vibration waves. But, the researchers may have
discovered the beginnings of a solution, as Dr. Parnell explains:
"We showed theoretically that pre-stressing a naturally available
material – rubber – leads to a cloaking effect from a specific type of elastic
wave. Our team is now working hard on more general theories and to understand
how this theory can be realized in practice. his research has shown that we
really do have the potential to control the direction and speed of elastic
waves. This is important because we want to guide such waves in many contexts,
especially in nano-applications such as in electronics for example. If the
theory can be scaled up to larger objects then it could be used to create
cloaks to protect buildings and structures, or perhaps more realistically to
protect very important specific parts of those structures."
Obviously, like all cloaking technology, this technology is still very much
in its infancy. But its potential applications in shielding buildings from
destruction is pretty much why our language has the word "awesome",
so hopefully this is worth waiting for.
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