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Changes for page Field Deployment Guides

Last modified by Jack Dent on 2025/10/30 11:52
From version 35.1
edited by Jack Dent
on 2025/10/30 11:52
Change comment: There is no comment for this version
To version 34.1
edited by KB
on 2025/08/12 12:18
Change comment: There is no comment for this version

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138 -Comparison of installation methods on Black Mountain (Canberra):
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140 -The seismic equipment was left in the field for approximately 6 months (April – October) through winter. There was much rain throughout the experiment period, with the last rain occurring one day prior to excavation, and heavy rain occurring the week before. Note that more temperature fluctuations may occur throughout summer, and thus more chances for condensation and corrosion to occur, therefore this experiment should be conducted again over a summer period.
141 -
142 -Upon excavating all setups, there appeared to be little difference in the moisture levels.
143 -
144 -The first method (PVC) had collected a small amount of moisture. The seismometer was a little bit wet, while the interior of the PVC housing had condensation lining the walls. The paver beneath was also quite damp, however, no water had pooled at the bottom of the seismometer.
145 -
146 -The other two setups (both using the sand method) were also quite moist. Upon excavation, the coarse river sand was damp (though not soaked). There had been no infiltration of mud from the surrounding area into the coarse river sand, suggesting that all the moisture had come straight down the column of sand, and not flowed in from the sides. Underneath the feet of the seismometer (SN3660) from the full setup, much condensation had been collected. There were no feet on the seismometer of the second sand setup and thus no space for condensation underneath. The tops of both seismometers were covered in damp sand, though there appeared slightly less moisture than the top of the sensor in the PVC housing. An accurate assessment of moisture content was difficult as one seismometer was covered in sand, and the other showed a clear view of how much surface condensation there was. 
147 -
148 -Additionally, when unwrapping the cloth adhesive from the PVC burial, there appeared to be a glob of hydrated glue from the adhesive. This was not present on the connections of the two sand burial seismometers, despite using the same cloth adhesive. This may suggest that moisture lingers for a longer period in the PVC housing (as suspected), having time to be absorbed into the adhesive more. 
149 -
150 -Upon inspection of the connectors of each seismometer, there was little condensation within each, and no sand had appeared to infiltrate the connections in the sand buried equipment.
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152 -|(((
153 -[[PVC burial>>image:20251027_111019.jpg||height="216" width="200"]]
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155 -[[PVC burial>>image:PVC glue.jpg||height="219" width="268"]]
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157 -[[Sand burial>>image:20251027_112642.jpg||height="218" width="192"]]
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159 -[[Sand burial>>image:20251027_112721.jpg||height="221" width="218"]]
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161 161  
162 -Key findings:
163 163  
164 -The PVC burial method resulted in a small amount of moisture collecting on the top of the seismometer and within the PVC casing, and the development of a hydrated glob around the connector. 
165 165  
166 -The sand burial method resulted in slightly less moisture collecting around the top of the seismometer (subject to error of perception), though no glob of hydrated adhesive, suggesting quicker drainage did occur. The sand burial did however allow for more moisture to collect on the underside of the seismometer compared to the PVC burial, though as the connector is atop the seismometer, this result may be irrelevant.
167 167  
168 -It should be noted that there was no mud present in the column of sand, suggesting little to no lateral seepage of moisture.
169 169  
170 -Lastly, all connectors contained a small amount of condensation, were free of sand or dirt (thanks to the cloth tape), and no corrosion was noticeable.
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