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Changes for page Field Deployment Guides

Last modified by KB on 2025/08/12 12:18
From version 23.1
edited by robert
on 2025/03/03 18:20
Change comment: Rollback to version 20.1
To version 25.2
edited by robert
on 2025/06/15 14:26
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1 -Field Guides & Best Practices
1 +Field Deployment Guides
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1 -= **Seismic Station Setup** =
2 -
3 -Conducting fieldwork for a seismic station setup involves a series of meticulous steps and considerations to ensure accurate and reliable seismic data collection. 
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9 9  (((
10 10  = **Site selection and preparation** =
11 11  
12 -* (((
13 -Choose a location with minimal noise interference and away from urban areas, traffic, and industrial activities.
7 +(((
8 +* If possible, choose a location with minimal noise interference and as far away from traffic and people as possible. Try to keep your station out of site to avoid theft or tampering. The site should not be installed in a place where people would ever stumble upon it (e.g. a walking trail or public area).
9 +* Nearby Trees, bushes, power poles etc can induce low period noise in your data when they sway in the wind. A rule of thumb is to have your sensor at least as far away from these as their height.
10 +* Cattle and stock can and will destroy your site. NEVER EVER install a station where cows can get to it.
11 +* If the area looks like a place that has flooded, or may flood again, absolutely assume that it will. This very much includes dry riverbeds or ponds. Always prefer locally elevated terranes.
12 +* The harder the soil, the better the signal. Sand and mud are your enemy.
14 14  )))
15 -* The site should be geologically stable and representative of the area's seismic characteristics.
16 -* Accessibility and security of the site are also important factors.
17 -* Conduct a detailed survey of the site, including topographical, geological, and geophysical assessments.
18 -* Prepare the site by clearing vegetation and levelling the ground.
19 19  
15 +* Grass can often grow high enough to block your solar panel from sun. If possible, clear an area in front of the panel to minimize this possibility.
16 +
20 20  = **Installing Sensors** =
21 21  
22 -* Bury seismometers at an appropriate depth for noise reduction and stable ground coupling, typically 0.5-0.8 metre depth.
23 -* Orient the sensors correctly using a compass, paying special attention to the north direction. When using a compass to orient the sensors, ensure it is kept away from metal objects or structures that could interfere with its magnetic field. Accurately determine the north direction for precise sensor orientation.
24 -* Ensure the sensor is levelled correctly. A paver or concrete slab can be used to allow for more accurate levelling.
19 +* Bury seismometers at an appropriate depth for noise reduction and stable ground coupling, typically 0.5-0.8 metre depth but deeper the better.
20 +* Ensure the sensor is leveled correctly, typically the sensor can be placed on a well leveled paver to make this easier.
21 +* Orient the sensor correctly using a compass, paying special attention to the north direction and accounting for declination.
22 +** When using a compass to orient the sensors, ensure it is kept away from metal objects or structures that could interfere with its magnetic field.
23 +** It is recommended to take a picture of the sensor's orientation next to the compass.
25 25  * It is recommended that the following sensors be installed with a PVC tube covering to prevent corrosion and other environmental degradation:
26 26  ** TC-120
27 27  ** TC-20
28 28  ** 3D lites
29 -* Hold the sensor or sensor covering securely while infilling and compacting the hole to ensure the sensor is kept level.
28 +* Hold the sensor or sensor covering securely while infilling and compacting the hole to ensure the setup is kept in the correct position (level and oriented).
30 30  
31 31  = **Setting up Data Logger** =
32 32  
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83 83  (% style="color:#000000; font-family:Arial,sans-serif; font-size:11pt; font-style:normal; font-variant:normal; font-weight:400; text-decoration:none; white-space:pre-wrap" %)4. Depending on the model of the seismometer, place a protective PVC tub over it.
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85 -[[image:1715741200573-382.jpg||height="203" width="102"]][[image:1715741200573-909.jpg||height="202" width="102"]]
84 +[[image:1715741200573-382.jpg||height="203" width="102"]][[image:1715741200573-909.jpg||height="203" width="102"]]
86 86  
87 87  (% style="color:#000000; font-family:Arial,sans-serif; font-size:14.6667px; white-space-collapse:preserve" %)5. Fill in the hole whilst stabilising the sensor and packing the dirt firmly.
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117 117  12. A completed site. Rocks and sticks can also be piled on the ends of the cage if there is a risk of animals tampering in the area.
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119 119  
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120 +
121 += Experimental Sand Burial: =
122 +
123 +Direct burials are used for Trillium Compact Postholes as they are specifically designed to be corrosion resistant. Other sensors such as the Trillum Compact 120, Trillum Compact 20, and 3D Lites are not built with this degree of corrosion resistance. Currently, the best prevention for moisture trapping and corrosion is burying them with a PVC covering. However, in particularly wet environments, some moisture can still collect within these coverings. One experimental method that is being trialled in hopes of providing better drainage is the sand burial. Steps 1, 2, and 3 remain the same, though once the sensor is set with the correct levelling and orientation, the subsequent infill steps differ. Once the open PVC tube is placed around the sensor, infill the hole around the tubing, holding it in place (image A). Once the hole is back-filled level with the tubing, securing it in place, begin filling the interior of the PVC tube with sand. Hold the sensor in place and ensure the sand is packed tightly around it (image B). Once the sand fills the PVC tube, gently remove the PVC tube while holding the sensor in place (pliers may be required to grip the tube). The last deviation for a sand burial from the standard burial is continuing to place some sand above the sensor, and dirt (or other local substrate around that sand pocket) until level with the surface (image C).
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126 126  {{box title="**Contents**"}}
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