In the field

Install and start up the nodes

1. Install the nodes along the desired profile.

   Setting up the nodes

   Depending on the field conditions, you might want to use either:

   • the manual deployment tool to dig a perfect fitted hole for the node
   • the custom blue land bases with spikes

2. Use the bump tool to deploy the nodes. Slide the bump tool over the node cap and hold it for about one second until it starts flashing white, then quickly remove it while holding the node firmly into the ground.

   GPS fix

   The node will look for GPS signal fix, then will start recording data automatically.

   Warning

   Make sure the bump tool is sliding parallel to the node cap. There is a risk to bend (and eventually break) the metal parts inside the bump tool.

3. In the NuSite app, go to NRU, select each deployed node and click on Assign to set line and station number. For each station, the system will use the GPS coordinates of the tablet at the time of the assignment.

   Info

   Each of our nodes has been assigned with a fixed ID between 1 and 90, sorted by increasing serial number. In the NuSite app, you can sort nodes by serial number, and refer to the ID/Serial Number correspondence list to ease assignment in the field.

   ID / Serial numbers list

   ID	Serial number
   1	310011576
   2	310011736
   3	310011740
   4	310011742
   5	310011751
   6	310011753
   7	310011764
   8	310011766
   9	310011776
   10	310011780
   11	310011782
   12	310011785
   13	310011795
   14	310011798
   15	310011804
   16	310011807
   17	310011808
   18	310011811
   19	310011814
   20	310011823
   21	310011824
   22	310011832
   23	310011835
   24	310011836
   25	310011845
   26	310011847
   27	310011851
   28	310011854
   29	310011859
   30	310011870
   31	310011888
   32	310011926
   33	310011987
   34	310014142
   35	310014383
   36	310014395
   37	310014396
   38	310014397
   39	310014401
   40	310014404
   41	310033655
   42	310034201
   43	310034204
   44	310034209
   45	310034224
   46	310034233
   47	310034234
   48	310034359
   49	310034433
   50	310034452
   51	310064177
   52	310064210
   53	310064298
   54	310064325
   55	310064328
   56	310064339
   57	310064370
   58	310064385
   59	310064391
   60	310064394
   61	310064401
   62	310064402
   63	310064403
   64	310064406
   65	310064409
   66	310064438
   67	310064439
   68	310064441
   69	310064495
   70	310064583
   71	310066685
   72	310066736
   73	310066760
   74	310066775
   75	310066836
   76	310067364
   77	310067383
   78	310067400
   79	310067447
   80	310067495
   81	310067502
   82	310067525
   83	310067617
   84	310073022
   85	310073104
   86	310073238
   87	310073390
   88	310073414
   89	310073990
   90	310076287

   Warning

   Line and station assignment in the field can take time. Although recommended, it is not mandatory. If you know which node ID/serial number corresponds to which field station (e.g. written on a field notebook), you will be able to assign it later when back in the lab. The process is described below, but note that it is not straightforward.

Collect shots

1. Connect the EVR-2 GPS seismic event recorder to the trigger and hammer source.

2. Start the EVR-2 app on the tablet, then connect to the EVR-2 device.

3. In Settings, select Clear shot history and Reset FFID at the start of a new survey to make sure you start with a clean list.

4. Go in Generate points to create the list of shot stations and line numbers that you want to collect.

   Warning

   To ease deployment, we usually use separate numbering for node stations and shot stations. For instance, if you use 90 nodes, and record shots in between each nodes and at both ends (i.e. 91 shots total), you will have node stations ranging from 1 to 90 in the NuSite app, and shot stations ranging from 1 to 91 in the EVR-2 app. Make sure you keep track of the correspondance between station number and position along your profile or grid coordinates in the field.

5. Go in Shots, then check that you start with the correct Line and Station number.

6. Collect shots along the line (use stack option if multiple shots at the same station, or choose correct station manually).

   Info

   You can discard bad shots in Shot history in the EVR-2 app, and thus prevent exporting the wrong time stamps.

End survey

1. If collecting roll-along data, undeploy the nodes (turning them upside down for a couple sec.), then set them up at their new location.

2. If collecting a new line with the same station assignment, you don't need to undeploy the nodes, simply set them up to their new location (but line number will not be correct).

3. If ending the survey, simply store the nodes upside down in the carrying bag. They will undeploy automatically.

4. In EVR-2 app., go in Shot history, then Output all shots with the button at the bottom-right of the screen.

5. Connect smartphone to the ENDUROZCAR computer to download the newly created file (OB_date&time.txt)