The baseline difference between different theodolites

Xin Changjiang Lanzhou Observatory, Lanzhou Institute of Seismology,

China Earthquake Administration

AbstractSome observatories have been installed two theodolites in China since 2008, so they got two independent baselines

for one fluxgate variameter. We supposed the two baselines should keep same change in the beginning, but we found most observatories shown two baselines did not coincide in some degree after operating more than one year. The following graphs show the above facts:

21471. 821471. 921472

21472. 121472. 221472. 321472. 421472. 521472. 621472. 721472. 8

1 19 37 55 73 91 109 127 145 163 181 199 217 235 253 271 289 307 325 343

variameter-M15 made in Danmark, DB component, red for MINGEO theodolite made in Hungary, blue for MAG2KP made in Hungary

Lanzhou Observatory

219. 2

219. 4

219. 6

219. 8

220. 2

220. 4

1 19 37 55 73 91 109 127 145 163 181 199

variameter-M15 made in Danmark, DB component, red for CTM theodolite made in China, blue for MINGEO made in Hungary

Kashi Observatory

21417. 1

21417. 2

21417. 3

21417. 4

21417. 5

21417. 6

21417. 7

1 18 35 52 69 86 103 120 137 154 171 188 205 222 239 256

variameter-GM4 made in China, DB component, blue for CTM theodolite made in China, red for MINGEO made in Hungary

Qianling Observatory

21419. 221419. 321419. 421419. 521419. 621419. 721419. 821419. 921420

21420. 121420. 2

1 19 37 55 73 91 109 127 145 163 181 199

variameter-M15 made in Danmark, DB component, blue for CTM theodolite made in China, red for MINGEO made in Hungary

21012. 821012. 921013

21013. 121013. 221013. 321013. 421013. 5

1 19 37 55 73 91 109 127 145 163 181 199

Changchun Observatory

21507. 221507. 321507. 421507. 521507. 621507. 721507. 821507. 921508

21508. 121508. 221508. 321508. 4

1 19 37 55 73 91 109 127 145 163 181 199

Chengdu Observatory

21365. 521365. 721365. 921366. 121366. 321366. 521366. 721366. 921367. 121367. 321367. 521367. 721367. 9

1 19 37 55 73 91 109 127 145 163 181 199 217

Wuhan Observatory

163. 5163. 7163. 9164. 1164. 3164. 5164. 7164. 9165. 1165. 3165. 5

1 19 37 55 73 91 109 127 145 163 181 199 217

Wulumuqi Observatory

20905. 520905. 720905. 920906. 120906. 320906. 520906. 720906. 920907. 120907. 320907. 5

1 19 37 55 73 91 109 127 145 163 181 199 217

Dedu Observatory

21303. 2

21303. 4

21303. 6

21303. 8

21304. 2

21304. 4

1 19 37 55 73 91 109 127 145 163 181 199 217

variameter-GM4 made in Danmark, DB component, blue for CTM theodolite made in China, red for MINGEO made in Hungary

Mengcheng Observatory

1 19 37 55 73 91 109 127 145 163 181 199 217 235 253 271 289 307 325 343

variameter-M15 made in Danmark, HB component, red for MINGEO theodolite (D 、 I) made in Hungary, blue for MAG2KP (D 、 I) made in Hungary, GSM magnetometer (F) made in Canada

Lanzhou Observatory

1 19 37 55 73 91 109 127 145 163 181 199

variameter-M15 made in Danmark, HB component, red for CTM theodolite (D 、 I) made in Hungary, blue for MINGEO (D 、 I) made in Hungary, GSM magnetometer (F) made in Canada

Kashi Observatory

1 19 37 55 73 91 109 127 145 163 181 199 217 235 253

variameter-GM4 made in China, HB component, blue for CTM theodolite (D 、 I) made in China, red for MINGEO (D 、 I) made in Hungary, GSM magnetometer (F) made in Canada

317583175931760317613176231763317643176531766317673176831769

1 19 37 55 73 91 109 127 145 163 181 199

variameter-M15 made in Danmark, HB component, blue for CTM theodolite (D 、 I) made in China, red for MINGEO (D 、 I) made in Hungary, GSM magnetometer (F) made in Canada

2597325974259752597625977259782597925980

1 19 37 55 73 91 109 127 145 163 181 199

variameter-M15 made in Danmark, HB component, red for CTM theodolite (D 、 I) made in China, blue for MINGEO (D、 I) made in Hungary, GSM magnetometer (F) made in Canada

341563415734158341593416034161341623416334164

1 19 37 55 73 91 109 127 145 163 181 199

variameter-M15 made in Danmark, HB component, red for CTM theodolite (D 、 I) made in China, blue for MINGEO (D 、 I) made in Hungary, GSM magnetometer (F) made in Canada

Chengdu Observatory

35010350113501235013350143501535016350173501835019350203502135022

1 19 37 55 73 91 109 127 145 163 181 199 217

Wuhan Observatory

249032490424905249062490724908249092491024911

1 19 37 55 73 91 109 127 145 163 181 199 217

2299822999230002300123002230032300423005230062300723008

1 19 37 55 73 91 109 127 145 163 181 199 217

Dedu Observatory

4341843419434204342143422434234342443425

1 19 37 55 73 91 109 127 145 163 181 199 217 235 253 271 289 307 325 343

1 19 37 55 73 91 109 127 145 163 181 199

variameter-M15 made in Danmark, ZB component, red for MINGEO theodolite (D 、 I) made in Hungary, blue for MAG2KP (D 、 I) made in Hungary, GSM magnetometer (F) made in Canada

Lanzhou Observatory

variameter-M15 made in Danmark, ZB component, red for CTM theodolite (D 、 I) made in Hungary, blue for MINGEO (D 、 I) made in Hungary, GSM magnetometer (F) made in Canada

Kashi Observatory

4126341264412654126641267412684126941270412714127241273

1 19 37 55 73 91 109 127 145 163 181 199 217 235 253

variameter-GM4 made in China, ZB component, blue for CTM theodolite (D 、 I) made in China, red for MINGEO (D 、 I) made in Hungary, GSM magnetometer (F) made in Canada

41340413424134441346413484135041352413544135641358

1 19 37 55 73 91 109 127 145 163 181 199

variameter-M15 made in Danmark, ZB component, blue for CTM theodolite (D 、 I) made in China, red for MINGEO (D 、 I) made in Hungary, GSM magnetometer (F) made in Canada

48218. 5

48219. 5

48220. 5

48221. 5

1 19 37 55 73 91 109 127 145 163 181 199

variameter-M15 made in Danmark, ZB component, red for CTM theodolite (D 、 I) made in China, blue for MINGEO (D 、 I) made in Hungary, GSM magnetometer (F) made in Canada

3709637097370983709937100371013710237103

1 19 37 55 73 91 109 127 145 163 181 199

variameter-M15 made in Danmark, ZB component, red for CTM theodolite (D 、 I) made in China, blue for MINGEO (D 、 I) made in Hungary, GSM magnetometer (F) made in Canada

Chengdu Observatory

35388353893539035391353923539335394353953539635397

1 19 37 55 73 91 109 127 145 163 181 199 217

Wuhan Observatory

1 19 37 55 73 91 109 127 145 163 181 199 217

did not coincide perfectly in most observatories. Some baselines had difference in trend. Some existed inconsistent in some period. Especially the problem appeared in DB component. This problem meant the different theodolites produced different datum at the same observatory.

Thanks Pro. Yang,s group for providing baseline data.

Questions: On the base of above graphs, we observed two baselines measured by two theodolites for same component of a variameter in 2009

The baseline difference between different theodolites

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