Dual Seismometers

Common frame and common enclosure for long and short period horizontal seismometers.

long- and short- period seismometers on common frame

The short period seismometer is on the left and the long-period seismometer is on the right. Notice how the wire for the boom of the short-period seismometer (left) is suspended from a long bolt that extends to the left from the top of the frame, and notice also that on the short-period seismometer the weight is located close to the frame.  The details of the long bolt for the suspension of the wire for the short-period unit are shown below.

wire_holder_sp2.jpg (233978 bytes)

wire_holder_sp.jpg (240358 bytes)

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