Inclinometry was done as follows:

    Datasets  El Dirn     HST     mean leg temperatures   Humidity
                          start     start   middle   end       %
  ( 20061010  89  cw     ~03:10     6.9       6.9    7.0
    20061010  89 ccw     ~05:30     7.0       7.1    7.2          )
    20061015  89  cw     ~06:30      -         -      -

Data was recorded from the 3 active inclinometers only: there is no strain gauge data, for instance.

A half-hour or so into the run an earthquake of mag 6.8 occurred near Waikoloa/Puako. The antenna was oriented essentially E-W at the time. The plot below shows the effects on the Y-axes of the three inclinometers. (2000mV = 100"). The TY trace (from the inclinometer in the receiver cabin) immediately rises (the antenna dips downwards) to a level of saturation and does not recover. The other inclinometers record what appears to be the (6.0mag ?) after-shock a few minutes later, and all traces cease after about another half-hour, presumably due to the outage of power. Rotation of the antenna appears to cease only following the after-shock.

A time-guesstimated version of the same data is presented here, and the TCS log of servo errors (in arcseconds, and with time-stamps in TAI corrected to UT/HST) is shown below:

The azimuth servo errors deviate predictably from zero every 12 seconds or so as a result of the scheduled azimuth motions during inclinometry, but change behaviour just after 07:07:54 HST, presumably indicating the arrival at JCMT of the first seismic wave. Elevation servo control is lost almost instantaneously about 5 seconds later.

The 'quake occurred at 07:07:49 HST (at the epicentre).