New Product Idea

"John Larkin" wrote in = message news: snipped-for-privacy@4ax.com...

Yeah, but the SNR is atrocious. Road noise, footsteps, air = conditioning?

Even with a large array of sensors (say you get one in every house on = the block), there's only so much signal to be found. The noise is most = likely uncorrelated (though varying throughout the day), so it could be = averaged out, but 1/sqrt(N) is a slow process.

Given enough processing power of course, you could still get some = interesting correlations. Quakes are big slow waves, so you won't see = much change over a city block. Or the "noise" itself may be of keen = interest to intelligence types. What better way to track everyone's = position than an invisible fleet of passive seismometers?

Sometimes they have "negative resistance", where a quake triggers a = fault line. Something like a Marx generator, made of rock instead of = electrons.

Tim

--=20 Deep Friar: a very philosophical monk. Website:

^^^^^ prick

mike

=================================================== But I say to you that everyone who is angry with his brother will be liable to judgment; whoever insults his brother will be liable to the council; and whoever says, ?You fool!? will be liable to the hell of fire.

Matthew 5:22 ===================================================

I see you, on the left, four rows back.

father mike

Is it really that difficult? Its not like the SETI problem, with a few receivers looking for very weak signals in lots of noise. Its a question of distributing a large set of useful sensors (hard drive shock accelerometers are probably too insensitive to be of any use and we don't know their XYZ orientation at any given time) and networking them. Once they are in place, the analysis isn't that difficult.

Answer this question: Why is it that whenever we (in the USA) have an earthquake, the local news cuts to a room full of ancient pen recorders? But when they had an earthquake (and tsunami) in Indonesia, the local officials had state of the art plots of things like phase and energy vs frequency and other stuff for the event on their PCs?

I'll pull on my tin foil hat and suggest a reason: Large networks of advanced sensors tied to state of the art data analysis systems are not only useful for earthquake analysis. The same sorts of data (generated by thousands of micro-quakes daily) can reveal quite a lot about geological formations. Including the locations of oil, natural gas and other resources. Making such data available to the public in this country would upset the holders of mineral rights and mining and drilling leases. So we'll be looking at ancient pen recorders for the foreseeable future.

Paul Hovnanian P.E. wrote: cut

Because those sensors are situated in a quiet spot, where heavy traffic will not upset the readings. When I was experimenting with some expensive sensor, I could read people walking 50 yards away. Sensors in every home is not a smart idea, you will be swamped with unwanted random signals.

Nope. Pen recorders just make better TV--nobody uses them for anything else nowadays.

Cheers

Phil Hobbs

I already said that.

Bull. They are still widely used as their accuracy is perfectly fine for the job. If it ain't broke, don't fix it. The mechanisms have been fitted with digitizing transducers though that allow the recorded data to also be electronically transmitted.

The mechanisms, however, have not changed a lot. Even the most sensitive MEMS accelerometer cannot beat a counterbalanced mass and a pointer. It feels the Earth move under its feet. It feels the sky tumblin' down.

I am sure that electronic means have taken over in all the prosperous nations, but I am also sure there are still old units out there,logging and reporting data as well.

Try taking two pen recordings from different sites and measure the phase difference between the P-waves.

On the other hand, if "the job" the pen recorders are intended for is a nice PR image for the news cameras, they sure look nice.

Can we (the public) see the raw digitized data somewhere?

On a sunny day (Fri, 02 Jul 2010 17:21:09 -0700) it happened AM wrote in :

So what are you looking for? Superior intelligence to you? OK just walk down the road and grab any living creature. :-)

Einstein said something like this: 'An idiot is somebody who keeps repeating the same thing that does not work over and over again expecting a different result.' I think he was referring to Michelson & Morley, but the general idea is valid in this context too :-)

Of course you see this in many places, looking for gravity waves LIGO, creating a working fusion power generator with a tokamak ITER, and not to forget adding yet an other particle in CERN, that you cannot do anything with, other then add some new values in your paper matrix.

And SETI.

Rich Grise on Google groups schrieb:

Hello,

these little home seismometer would detect mostly the local seismic events if somebody is walking around nearby.

A god scientific seismometer is mounted directly to the base rock in an area with very low traffic artefacts to the seismic measurements.

Bye

Try reading the whole thread next time, idiot. It has already been covered.

This is currently being discussed in another thread on Christian engineers.

You may get some insight there. ;-)

Tch Tch..You were warned that the untreated Syphilis would eventually get to the brain. Did you listen? NO. Just don't spread it to your other sister, ok?

mike

Been done, if you count computer apps. Google "laptop seismometer cochran" for Dr. Elizabeth Cochran's (UC-Riverside) program using the existing accelerometers in various portable electronics.

Mark Zenier snipped-for-privacy@eskimo.com Googleproofaddress(account:mzenier provider:eskimo domain:com)