Amateur Radio Public Seismic Network

Chang Heng's seismoscope
DeutschspacerEspanolspacerFrancaisspacerItaliano - VolksMeter CSP Averages - PortuguesspacerArabicspacerJapanesespacerKorean

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A New Look at an Old Tool:
the Cumulative Spectral Power of Fast-Fourier Transform Analysis
Sheng-Chiang Lee and Randall D. Peters
Physics Department, Mercer University, Macon, GA 31207


PSD Cobb Average
Power Spectral Density February Averages Macon, GA (blue) - Cobb, CA (red)
CSP Cobb, CA - Redwood City, CA - Macon, GA Average
February Comparison N/S CSP Averages - Macon, GA - Cobb, CA - Redwood City, CA
Average of the Feb CSP curves for Cobb [Mountain] CA VolksMeter N-S channel
Average Feb CSP Cobb Curves VolksMeter N-S Channel - large image
FFT-CSP of First 10 days of February, Cobb [Mountain] Ca.
CSP, 1st 10 days - February 2009, E-W VolksMeter channel, Cobb [Mountain], CA - large image
Cobb/Redwood City, CA compare February 22-25, 2009 provided by Randall Peters
Click for large image - February 22-25, 2009

All VolksMeter Averaging Images provided by Randall Peters

Eigenmodes of a square plate

The above video is a nice depiction of how the eigenmodes of a plate change with increasing forcing frequency.

North Auroral Oval - South Auroral Oval
Current extent and position of auroral oval at each pole. Click image to go to page.

If anyone owning a PC, Macbook, or Macbook Pro is interested in Earthquakes and would like a FREE way to monitor them, check out the current progress log page provided by ARPSN (Amateur Radio Public Seismic Network) for a guideline.

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