M4 1900 2003

1
????? ?????? ?? ????????? ?????? ?????? ??????
??????????? (??? ???????????)
??????? ???? ?? ????? ????? ???????? ????? ????
???? ????? ?????. ??? ????? ??????? ???? ?? ????
?????? ?????? ????? ???? ????? ???????
????????????? ?? ??????? ??? ??? ?????, ???
?????, ????? ?? ????, ????? ????, ?????? ?????
???? ?????? ???'. ????? ????? ????
2
????? ?????? ?????? ???? (Mgt4) ???? 1900 ?? 2003
3
????? ???? ?????? ????? ????? ??????

• ????? ???? ?????? ????? ???? ???? ??????? ??????
  ?????? ????. ??? ???????? ???? ?????? ?????, ???
  ,?????, ???, ?????? (Johnston 1984 Sasai and
  Ishikawa, 11978 Shapiro and Abdullabekov, 1982
  Oshiman et al., 1991 Raleigh et al., 1977).
• ??????? ???? ????? ????? ?? ?????? ???????.
  ??????, ??? ?? 24 ????? ??????? ?????? ????
  ??-??????? ?????? ????? ???? 1976. ?????? ?????
  ???????????? ??????, ??? ????. ???? ????? ??
  ?????? ???? ???? ???? ???? ?????? ????? ???
  ?????? ?? nT . ?? ?? ?? ??? ???? ????? (????,
  ?????, ???) ????? ????? ???? ?????? ??????
  ??????? ?? ?????? ???? ????? ?????? ??????
  ??????? ?????. ????? ????? ??? ????? ????? ?????
  ??? ???? ???????? ??????? ??????? ?????.
  ??????????? ?????? ??????? ?????? ?? ?????
  ??????? ?????? ???? ???? ????? ??????.

4
Main specification of potassium Supergradiometer
5
Supergrad magnetic sensors
6
The view on the Amram mountain peak
7
(No Transcript)
8
The entrance to the tunnel (view from the
opposite mountain).
Low magnetic door (stainless steel concrete)
9
(No Transcript)
10
(No Transcript)
11
Example of the SuperGrad total field and
differences recordings
12
dIdD component magnetic sensor
13

Example of the dIdD total field and three
components recordings
14
Component magnetic measurements inside the tunnel
Date 12/08/2003 1221-1555 UT Instrument
magnetic theodolite DIM-100
 
Target Sn3 Pn3
Pn2 Pn1 Sn1
W
7 m
7 m
Point of measurements SuperGrad Sensors
N
Results of the measurements
Theory and estimations
dT31 sin(I1) dD(D3-D1) (dH dZ)(
I3-I1) dT31300 pT - total field differences
between Sn3-Sn1 dD85 nT variation of
declination D3,D1 and I3,I1 Declination and
Inclination in Pn1 Pn3 (D3-D1)/L 1/m
15
Block-diagram of the initial data processing
Best fit (new coefficients)
SG 1 min
SG 50ms
SG 1 min
Pure SG data
Time of noise determination
Best
Interpolations
Averaging
dIdD 1 min
dIdD 1 min
dIdD 5 s
Best fit (Outer field Elimination)
Further data processing
16
SuperGrad differences in June 2003
17
SuperGrad recordings after the external magnetic
field variations elimination.
June October 2003
18
(No Transcript)
19
(No Transcript)
20
N
To Eilat
m, New Israel Datum
Geology of the area Precambrian Amram Granite
Porphyry is exposed in a structurally elevated
block along the western margin of the southern
Arava Rift. Major faults of the Rift are 2-4 km
to the east of it.
21
(No Transcript)
22

• Conclusion
• SuperGrad and dIdD magnetometers have been
  operated uninterraptive since
• May 2003 (time of SG configuration
  changing) with all ordered technical parameters.
• All SuperGrad differences are influenced mainly
  by declination of external field,
• because declination of the main field is
  changed from point to point inside the tunnel.
• 3) The proposed data processing technique make
  it possible to demising natural and artificial
  noises till gradient of about 0.1pT/m .
• 4) The long period variation over the
  June-October 2003 in SuperGrad differences is
  conditioned probably by an inner source .