[Turtle]

Originally Posted by FrankM

The disruption of radio propagation prior to major earthquakes has been noted as far back as the 1960s. The APM device will be influenced by propagation disruptions that are hundreds of miles away and they can be in any direction. A field mill will detect the differential potential in-line with the direction of the vane aperture, the local potential. A field mill sitting vertically will detect the difference between where the device is sitting and the atmosphere above it.

I suggest then that an array of Ambient Power Modules similarly oriented may well triangulate the signals in the same manner as arrays of seismometers locate quake epicenters & depth. If I recall from the article, the radio anomaly preceded the actual quake by 6 days. .......

[FrankM]

Originally Posted by Turtle

I suggest then that an array of Ambient Power Modules similarly oriented may well triangulate the signals in the same manner as arrays of seismometers locate quake epicenters & depth. If I recall from the article, the radio anomaly preceded the actual quake by 6 days. .......

The ionosphere disturbance over an earthquake precursor can have a spread of several hundred miles and overlay multiple earthquake fault zones. As noted in the article cited in my previous post, precursors can occur and not result in a fault movement.

There are a number of sensor devices that can detect the electromagnetic emission caused by an earthquake precursor (and earthquake) but the big problem is having a real-time system that links the detectors. The real-time system is the major achievement of the seismographic system. Traditional seismographs are dealing with an actual earth movement and there are substantial propagation delays which are readily handled by that real-time system.

There are a lot of other factors involved in detecting disruptions in radio propagation. Depending upon an APMs location, its primary signal sense may be swamped by local emissions and have little change caused by propagated signals. There will be major differences in radio propagation depending upon day and night. Solar glitches will effect sensors in some areas and not in others. Various types of radio transmission devices are gong on and off all the time and they will caused unexpected rise and falls in an APMs output. How do you normalize a particular locations APM output?

The DEMETER satellite can detect emissions in real time, when it is overhead, but that one satellite cannot triangulate the ground area which had the emission.

[Turtle]

Originally Posted by FrankM

... but the big problem is having a real-time system that links the detectors. The real-time system is the major achievement of the seismographic system. Traditional seismographs are dealing with an actual earth movement and there are substantial propagation delays which are readily handled by that real-time system.

There are a lot of other factors involved in detecting disruptions in radio propagation. Depending upon an APMs location, its primary signal sense may be swamped by local emissions and have little change caused by propagated signals. There will be major differences in radio propagation depending upon day and night. Solar glitches will effect sensors in some areas and not in others. Various types of radio transmission devices are gong on and off all the time and they will caused unexpected rise and falls in an APMs output. How do you normalize a particular locations APM output?

So like all good ideas, there is some work involved in my scheme. So it goes.

In the vernacular of the day, I suggest just doing it. Make 3 identical APM's per the instructions I linked and deploy them 10's of miles apart and start recording. Whatever you record in the first month is your first normalization (or whatever arbitrary time measure you want, i.e. daily, weekly, & so on.) You then compare recordings for commonalities and further screen those for identifiable RF sources.

Besides the earthquake precursor signals, you have a unique data set for all the sources you mention as well. Bonus. ......

[FrankM]

I ran across a website that discussed some of the problems that would have to be addressed to create a real-time seismometry system that could exploit the accelerometer that is installed in MAC laptops.

Evil Mad Scientist Laboratories - Proposal: Distributed seismometry

Some enterprising firm has already developed the software to extract the MAC accelerometer data and that is the first important step with any "detector", getting it in a form that is useful to a computer.

[Turtle]

Originally Posted by FrankM

The ionosphere disturbance over an earthquake precursor can have a spread of several hundred miles and overlay multiple earthquake fault zones. As noted in the article cited in my previous post, precursors can occur and not result in a fault movement.

There are a number of sensor devices that can detect the electromagnetic emission caused by an earthquake precursor (and earthquake) but the big problem is having a real-time system that links the detectors.

Have you seen this story on possible precursor electrical signals recorded Frank? It's right up your alley.


Evidence Mounts for Electromagnetic Earthquake Precursors

Originally Posted by wired

Evidence Mounts for Electromagnetic Earthquake Precursors
By Keay Davidson 12.14.07 | 6:00 PM
SAN FRANCISCO –- Scientists revealed data Thursday that an electromagnetic alarm might have preceded a 2007 earthquake in Northern California. The evidence could offer support to a controversial theory that mysterious and little-understood signals might offer fair warning for imminent catastrophic earthquakes.

Scientists detected the signal Oct. 30 near Milpitas, California, 19 hours before a medium-size quake -- with its epicenter in the Alum Rock neighborhood of San Jose -- shook the region, scientists told Wired News Thursday.

"Alum Rock saw a signal that didn't happen at any other site: It was a series of electromagnetic pulses that were drawn out over eight minutes," said Tom Bleier, a researcher with QuakeFinder, a Palo Alto firm. He cautioned, however, that further study is needed to determine if the electromagnetic signal has "some other cause" besides the quake. ...

Might be interesting to go back in the papers and see if anyone saw any strange lights, as well as check the missing pets report.

[FrankM]

Yes, I saw the article and had made a comment to a group that has interest in devices that can detect the extremely low frequency (elf) electromagnetic (EM) emissions from earthquake precursors and earthquakes. I quoted the last paragraph from the article, which was made by Dr. Ellsworth, the influential head of the seismic hazard group at the USGS in Menlo Park, CA.

But Bill Ellsworth, a prominent Geological Survey geophysicist, said that in the absence of an infinite amount of federal funding, first priority should go to the development of more seismic-detection networks that -- unlike earthquake alarms -- are based on well-understood physical principles.

The statement below was extracted from one of the better informed individuals that participates in the group.

[What are the well-understood physical principles? It is the difference in the arrival times between P-S waves, which the USGS has touted in recent weeks as a major step forward in earthquake early warning. Besides the fact that this physical principle has not been invented by the USGS and is already operational in several places around the world, the P-S wave difference provides an "early warning" between zero and, possibly, 20 seconds depending on the distance from the hypocenter.]

Everyone should be aware that the traditional geophysicists and seismologists obtain multiple millions of dollars to study the mechanical action of earthquakes and they are spending zero on examining the electromagnetic phenomena that is being generated by earthquake precursors and earthquakes. They do not understand the mechanism that produces EM emissions even though it was published more than 5 years ago, and additional researchers have confirmed the mechanism. Once a group becomes entrenched they make sure competing theories do not get published. This seems to be a major problem in the U.S. Researchers in the U.S. have managed to get their research published in European geophysical journals but not in U.S. geophysical journals.

EM emissions have been detected days before major earthquakes. The French DEMETER satellite has been recording EM emissions from earthquake precursors and earthquakes for years.

Would you like to have a day or more warning of a major earthquake or a maximum of 20 seconds? If the seismologists happen to be there watching when their sensors identify the occurrence of an earthquake they might have time to tell a few associates in the room, "hang on!" Is that worth millions?

[Turtle]

Originally Posted by FrankM

...
The DEMETER satellite can detect emissions in real time, when it is overhead, but that one satellite cannot triangulate the ground area which had the emission.

Hey Frank. I was checking out the DEMETER site tonight and found this little bit in their News. It sounds like they can triangulate to me? Any idea why the US military is heating the ionosphere over Austrailia?

News DEMETER

Originally Posted by DEMETER

NWC in Australia is a very powerful transmitter of the US army (1000 kW) which sends waves at 19.8 kHz. The figure shows the perturbations induced in the ionosphere by this transmitter around 14.52.30 UT. These perturbations are registered when DEMETER is close. The top panel represents a spectrogram in the HF (High Frequency) range where we can observe a characteristic frequency of the plasma which is excited around 1.8 MHz. The following panel shows a VLF (Very Low Frequency) spectrogram of an electric component with a dramatic increase of the signal over all the frequency range (the transmitter frequency can be observed at 19.8 kHz). Then the electronic density and temperature measured by the Langmuir probe are plotted. The curves indicate a large variation of these ionospheric parameters as in the bottom panel which shows the ion temperature measured by the plasma analyzer. During two years more than fifty typical events as this one have been registered and the orbit projections at the time of the perturbations have been plotted on the following map.