Gravity measurings of Antarctic

During the season works of the 9th (2004) and 10th (2005) Ukrainian Antarctic expeditions workers of the Institute of geophysics NASU on the islands of Argentine archipelago measuring of the gravitational field at 17 points were conducted. Scheme of the observation points placing is given in fig. 1. British Antarctic Service has already performed works on the creation of bearing gravimetric points’ network, which is situated on the area with coordinates between southern latitudes of 51 and 71 degrees (Renner, 1982). In the area, which borders station “Academic Vernadsky” there are 16 bearing gravimetric points, two of which are situated on Galindez Island. All measuring were performed with one of them (VS01) taking into account, where gravitation force angle is 982339,6 mGal (Renner, 1982). Results of the field observations are given in table 1. Gravitation force abnormalities are obtained through the use of International formula of the normal Earth field 1930 with Potsdam system’s amendment. Map of abnormalities in the free air (Δgс.в.) of the Argentine islands region is given in fig.1. Value of Δgс.в., which were obtained as a result of field works, absolutely fall in with regional field of the research region, which confirms the high quality of these works.

 
 
Fig. 1. Abnormalities in the free air of the Argentine islands, isolines in mGal.
1 – placing of the observation points (О.М.Rusakov, I.B.Makarenko, S.S.Chulkov).
 
 
Results of the field gravimetric observations of the 9th and 10th Antarctic expeditions.
 
 

Point’s name

 

Geographical coordinates
Absolute value, mGal
Height (m)
 

Abnormality in the free air
(mGal)

 

 

Bouguer abnormality
(mGal)

 

Latitude
Longitude
1
GS-30
-64,07877417
-65,15790834
982360,86
18,226
66,68
64,65
2
GS-40
-64,07475466
-65,20767627
982340,275
18,173
46,36
44,34
3
GS-50
-64,13603279
-65,1749509
982349,8
17,519
51,32
49,37
4
GS-60
-64,0920
-65,1409
982339,27
25,9396
46,5
43,6
5
GS-70
-64,08327785
-65,24750238
982334,31
17,036
39,44
37,54
6
GS-80
-64,07031
-65,16022
982332,305
20,906
39,55
37,23
7
GS-90-а
-64,1846
-65,3370
982330,925
22,121
30,40
27,94
8
GS-110
-64,1118669153
-65,1259208263
982354,615
17,11
56,73
55,82
9
GS-120
-64,21801164
-65,23468524
982340,694
18,934
36,81
34,70
10
GS-130
-64,22176364
-65,23976194
982341,914
23,078
39,05
36,47
11
GS-200
-64,27407679
-65,23688375
982339,875
18,595
31,91
29,84
12
GS-230
-64,27902489
-65,24379049
982339,32
17,532
30,67
28,72
13
GS-240
-64,3174766
-65,23923264
982339,41
18,503
28,33
26,27
14
GS-250
-64,30787211
-65,239728
982370,755
16,818
29,84
27,97
15
GS-260
-64,31717175
-65,2357799
982339,885
17,819
28,62
26,64
16
GS-310
-64,3976
-65,5112
982340,035
17,305
51,12
49,19
17
VS01
-64,153
-65,147
982339,2
9,076
36,90
35,9
 
(О.М.Rusakov, I.B.Makarenko, S.S.Chulkov)