View Seismometer Data
from
Palo Alto CA
Below are image files for a Force-Balance vertical seismometer built along the design of Dave Nelson and Brett Nordgren. The seismometer has both a low and high sensitivity over a frequency range of 100 seconds to 20 Hz. The low-gain sensitivity is 7.50 volts/cm/sec. The high-gain sensitivity is 375 volts/cm/sec. Signal clipping is 1.3 cm/sec for low-gain and 267 um/sec for the high-gain side.
Low-gain Channel
14.4um/sec per line, WinSDR Y-Scale factor=1
Digital filter low pass 10 Hz, high pass 0.02 Hz
High-gain Channel
1.15 um/sec per line, WinSDR Y-Scale factor=4
Digital filter low pass 0.08 Hz, high pass 0.02 Hz
The seismometer data is updated every 10 minutes. A wide dark constant height data is probably caused by the washing machine/dryer. A sharp short spike is probably us checking the seismometer vault (wine cellar). Send an e-mail if you have any questions.
