Real-time Seismometer Waveforms

These images are updated every five minutes. The Yuma broadband vertical is located in the basement on the floor slab, next to a 0.6 x 0.9 m hole containing the main test pier.  The Yuma has a broadband velocity response which is generally flat to frequency between 50 seconds and 30Hz, though the high-gain, long-period traces have been filtered with a 0.08 Hz 6p low-pass filter to mostly eliminate microseisms and other background noise.  

Data are recorded and uploaded as images from a Webtronics 16-bit digitizer, controlled by WinSDR and running on a Raspberry Pi 2.

The instruments are still in the process of being installed and soon I hope to have both mounted on the main test pier with considerably more thermal insulation. This, I expect will reduce the level of background noise significantly.

Yuma High-gain Long-period Vertical Channel -- Distant Quakes

Yuma Lower-gain Broad-band Vertical Channel -- Local, Regional and large Distant Quakes

Guralp Seismometer Waveforms

The Guralp CMG-3ESP 3-axis broadband seismometer is located in the basement, on the main test pier, which rests above shallow basalt bedrock. This instrument has a broadband velocity response which is generally flat to frequency between 60 seconds and 30Hz, though the traces have been filtered with a 0.08 Hz 6p low-pass filter to mostly eliminate microseisms and other background noise.

Data are recorded and uploaded as images from a Webtronics 24-bit digitizer, controlled by WinSDR and running on a Raspberry Pi 2. Note how much more local noise there is on the horizontal channels compared with the vertical, even though the horizontal and vertical channels are recorded using identical sensitivity settings and filtering. High-gain horizontal data is generally useless at amateur sites, since long-period horizontal measurements are extremely sensitive to unavoidable ground-tilt variations.

CMG-3 Long-period Vertical Channel

CMG-3 Long-period N-S Channel

CMG-3 Long-period E-W Channel