Thank you for your poste Tonystrange.tonystrange wrote:I have been using using the off-the-self solution (mentioned earlier in these posts) of
the Mindset slinky seismometer
the Mindset USB ADC
and jAmaseis (http://www.iris.edu/hq/jamaseis/)
This worked fine with a PC. I wanted to replace the PC as a longer term solution, but I seemed to have difficulties with a Pi 1. However, after some help from BGS (http://www.bgs.ac.uk/schoolseismology) and Redfern electronics, I have managed to see it working apparently successfully on the Pi 2. (a much cheaper and lower powered solution). It was necessary to install jAmaseis
and also librxtx
sudo apt-get install librxtx-java
java -Djava.library.path=/usr/lib/jni -cp /usr/share/java/RXTXcomm.jar -jar -Dgnu.io.rxtx.SerialPorts=/dev/ttyACM0 jAmaseis.jar
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Raspberry Shake is novel seismograph that can: Record earthquakes magnitude 2 and up within a radius of 50 miles. Record earthquakes magnitude 4 and up in a radius of 250 miles. Record earthquakes of larger magnitudes farther away but it will miss some of the subtleties and some of the lower frequencies. Share data with seismic observatories world wide in standard format. Show all activity for the last week. Send alarms and warnings to your cell phone. See and plot the data from any other Raspberry shake.
As far as I know, it is the only commercially available seismometer based on the Raspberry Pi, so in that category of one- yep . The whole package including electronics and software is quite well done in my opinion. Yes, the 4.5 Hz vertical geophone doesn't have much low frequency response compared with the "pro" sensors, but they have wrung more performance from it than you might assume from the specs. It is a velocity sensor and I think several orders of magnitude more sensitive to a given local or distant quake than the accelerometer in a smartphone. My copy of the R-Shake showed a clear signal way above background on a M7.8 quake over 4000 km away (Solomon Islands -> CA) and other people with the same unit saw it from 10000 km. I'd be amazed if a cellphone sensor would have detected that signal above noise level. If you like numbers, have a look at the modeled noise performance: http://bnordgren.org/seismo/RSS_Spice_Results.pdfBudBennett wrote:State of the art...really?
Any software to " detect " seismic wave?El Berto wrote: ↑Thu Apr 12, 2012 7:25 amHi, I don't know what do you expect from your "home made" seismometer, but I work in a Seismological Research Center (I work on maintenance).
You could make your seismometer... just for fun: I know in your area there are strong hearthquakes, but you can only detect hearthquakes through "broad-band" seismometers (really hard to build), we use ADC starting from 20 bits ap to 24 bits.
So, the only one thing you can do (I still talk as "professional" point of view) is to use accelerometers. I've seen on the web a lot of projects of low-cost accelerometers for seimic use, made through MEMS accelerometers (like LIS3LV02DQ from ST). If you prefear there are also the analog-output version you can read with ADC.
Then, you also need a software to "detect" seismic wave from "others" waves.
Keep in mind, if you'll build a "serious" seismometer, it will be very sensible to external "noises", like steps, cars, and so on.
We are studying a seismometer based on the vibrations of a liquid, probably you'll find some interesting documentation around the web of something similar.
I hope to have been useful (sorry, I don't speak english so well).
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