A0-AC99 017 ISTITUTO DI METROLOGIA GUSTAVO COLONNETTI TURIN (ITALY) F/S A/5ABSOLUTE GRAVITY MEASUREMENTS IN THE UNITED STATES OF AMERICA.(U)NOV 80 I MARSON,.F ALASIA AFOSR-80-0157

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AFO TR-81- 52 1 jVE

,PSCLUTE RRAVITY4"UREMENTS IN THE IMTD STATES CG AWRICA

UniversitbTriestep Italy

an '"DTICFranco ALASIA

C-, ' Istituto di Metrologia "G. Colonnetti" bEE 8 ." ... Torino, Italy MAY 15 ,1981

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Prepared f or..AIR FORCE GEOPHYSICS LABORATORYAIR FORCE SYSTEMS COMMANDUNITED STATES AIR FORCEHANSCOM AFB, MASSACHUSETTS 01731

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Final -ABSOLUTE GRAVITY MEASUREMENTS IN THE 5 may 1980 - 4 july 1980UNITED STATES OF AMERICA 6 PERFORMING O7G. REPORT NUMBER

R 1627. AUTHOR(s) S CONTRACT OR GRANT NUMBER(-)

Iginio MARSON and Franco ALASIA AFOSR-80-0157 ^&=

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IsLituto di Metrologia " G.w Colonnetti" 1206 a 1230/AStrada delle Cacce 73)10135 TORINO, Italy I)DMA000AA 69' I

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Absolute gravity measurements

20 ABSTRACT (Confnuo an reverse side it necessary and Idenify by block number)

.The measurements of gravity acceleration described in the report were performed in 1980,within a grant program sponsored by the US Air Force. The introductory part of the reportillustrates the transportable absolute gravimeLer and ancillary instrumentation used inmeasurements, and describes the measurement method applied; uncertainty and errors areanalysed as well. Measurements of gravity acceleration inade in Europe prior to the USAprogram are also briefly considered before a df1 'iled account is given of the measurementsmade in the USA. The'numerous tables in the t, .A and at the end of the report form an

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essential part of itSix stations were observed in the USA and approximately 100 measu-rements made per station. The results show an overall uncertainty in g measurementsof the order of 10 G- .

"Acoes-slon For,

NT71S GRAk,DTIC TABUnannounced [Justification

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The work described in this final report was developed in the framework of aninternational grant programme for basic research of the US Air Force Office ofScientific Research, grant n0 AFOSR-80-0157.

For the realization of the programme contributions were given by-Italy : A. Bray, contractor representative, Director of the Istituto di

]etrologia "G. Colonnetti" (IMGC), Torino; G. Cerutti, physicist, maininvestigator, researcher at IMGC; 1. Marson, physicist, principal investiga-tor, assistant professor at the University of Trieste; L. Cannizzo, higher-grade technician at [MGC; F. Alasia, higher-grade technician at IMGC.U.S.A. : B. Szabo, programme manager, Senior Scientist at the TerrestrialSciences Division, Air Force Geophysical Laboratory (AFSC), Hanscom AFBase; W. Spita, gravimetrist, Geodetic Survey Squadron, DMATC, WarrenAFB, Wyoming; 3. Hammond, physicist, Geodesy & Gravity Branch,Terrestrial Sciences Division AFGL.

Measurements in USA were carried out by I. Marson, F. Alasia, W. Spita. G.Cerutti gave his cooperation also in preparing the report.

The Istituto di Metrologia "G. Colonnetti" of the National Research Council ofItaly developed, in cooperation with the Bureau International des Poids et Mesures(BIPM), SFvres, a transportable absolute gravity meter, with 10 ,,Gal uncertainty(W. This instrument has been used in the past five years to determine the gravityacceleration in 23 European sites to improve the International Gravity Standardi-zation Net (IGSN 71) (r*). Moreover, six absolute stations had been observedduring a previous USA campaign in 1977 (***).

In Summer 1980 measurements were carried out in six sites in the United States:Boulder, Colorado; Alamogordo, New Mexico; Mc Donald Obs., Texas; Sheridan,Wyoming; Great Falls, Montana; Anchorage, Alaska.

The work was supported by the US Air Force Geophysical Laboratory, HanscomAFB, Mass., under grant n0 AFOSR-80-0157.

( ) Cerutti, G., Cannizzo, L., Sakuma, A., & Hostache, J. A transport-able apparatus for absolute gravity measurements. VDI-Berichte n. 212,1974: p. 49.

( m) Cannizzo, L., Cerutti, G., & Marson, I. Absolute gravity measure-ments in Europe. II Nuovo Cimento, vol. IC (n. 1), 1978: p. 39.

Marson, L, & Alasia, F. Absolute gravity measurements in Switzer-land. P.L, IMGC Technical Report R 127, 1978. P. I1, IMGC TechnicalReport R 142, 1979. P. III, IMGC Technical Report R 156, 1980.

Marson, I., & Alasia, F. Absolute gravity measurements in theUnited States of America. Report AFGL-TR-78-0126.

Symbols and Abbrevlatiorw

g value of gravity acceleration ()

value of g corrected for tide effect

94 final mean value of gravity acceleration at height h from pillar

surface, normalized at a reference fringe number and corrected for

electronic delay

gravity value reduced to reference level (floor or pillar surface)

h height from ground or pillar surface of the point where g is

determined

m standaid deviation

M standard error

N number of interference fringes in the traiectory of projected body

N m total number of g measurements at each station

N r )urnier of reference iringes

t time interval between the two passages across the higher station

during one trajectory

T time interval between the two passages across the lower station

during one trajectory

T.C. Earth tides correction

U.Time Greenwich mean time (Universal Time)

N.V.T. REJ. Non vertical trajectory. Rejected

(.) The value of q is given by the formula

4.1 (N - 0.25)9 T 2 2

where I :L 0.632 991 4122 i-m is the wavelength of th.- He-Ne laser beam.

(mn) According to the resolution of the WG 2 of the International Cravity

Commission, the Honkasalo teim has not been included.

2

V

L THE IMGC ABSOLUTE GRAVITY METER

1.L IMeasurement method

The method adopted consists of the observation of the symmetrical free

fall of a body in the gravitational field of the earth.

The advantages of this method are well known: relative freedom from

residual air resistance and higher accuracy in Lime measurements, owing to the

symmetry of the motion.

An rbject is projected vertically upwards and, in its rise and fall, itcrosses twice two stations separated by distance L, whose value is accurately

determined.

Two time intervals, T and t, corresponding to the two passages across the

lower and upper stations respectively, are measured. The value of the acceleration

due to the gravity force of the earth is given by

g = 8L/(T2 - t2) (1)

The vertical gradient of the gravity force being assumed as constant along

the whole trajectory, the value of g obtained from (1) corresponds to a point

situated at height

z = L/6 + 1/3 - H/6 (2)

from the apex of the trajectory downwards (I is the distance between the apex and

the upper station and is negligible with respect to L).

The repeatability of the trajectory at each station and the determination of the

apex are obtained with an uncertainty lower than 1 mm.

1.2. Technical description

The essential parts of the apparatus are a Michelson interferometer and along-period seismometer (- 20 s) (Figure 1). On the inertial mass of the

seismometer is placed a corner cube (ccl) forming one mirror of the interferome-

ter and the reference fixed point. The radiation from a stabilized HeNe laser is

used. A second corner cube (cc2) is projected vertically in a vacuum cylinder

(, 0.1 Pa) and forms the movable mirror of the interferometer. Two

3

photodetectors (Ph a, Ph b) detect the interference fringes during the vertical

motion of the corner cube and drive the electronic counters of the flight time and

the trajectory length.

1.3. Measurement techniques

No physical standard of length is used, therefore measurements start at a

pre-determined but arbitrary instant on the upward trajectory. At that point,

fringe counting begins by means of a bi-directional counter guided by the signals

of two photomultipliers. Simultaneously, computation of the total flight time

begins as well. Another time counter is reset by each fringe in the rise and is

stopped only by the first fringe in the fall motion, owing to phase relation

inversion of the photodetector signals at the apex of the trajectory. This time

interval is quantity "t" in eq. (1).

The upper station is therefore placed at the last fringe in the upward

motion. If N is the total number of fringes recorded in the upward motion and A

the wavelength of the laser radiation, then

L=N + (3)

In the downward motion the counter counts the number of fringes in decreasing

order, and when it reaches fringe 0, it stops counting of time T.

1.4. Errors

a) Distance measurement

It is directly connected with the measurement of the value of the

laser light wavelength and with its stability. A maximum relative error of 5x10 "9

corresponding to + 5 ,,Gal, is expected.

Therefore, the laser wavelength is measured before and after each

measurement trip.

Microseisms influence the determination of distance, as they alter the

position of the fixed mirror.

These effects have been reduced by ., 20 times by placing the fixed corner

4

cube on the inertial mass of the seismometer.

The mechanical shocks of the catapult on the movable corner cube can be

a source of disturbance for the experiment; for this reason, measurements begin

with a pre-de'ermined delay with respect to the STARTING POINT in order to

avoid vibration of the corner cube.

b) Laser beam verticality

Verticality is obtained using a mercury pool. The error must be less

than 10"4 rad in order that errors in "g" measurements can be less than 5 tlGal. No

correction was applied to the g value for this error, but a + 5 ,Gal uncertainty

was introduced in the overall evaluation of measurement uncertainty.

c) Trajectory verticality

-4Deviation from verticality must be less than 10 rad over the whole

trajectory, to obtain homogeneous visibility ( 80%).

d) Movable corner cube rotation

Rotations must be less than 0.03 rad/s. The corner cube must be

adjusted so that the optical and gravity centres coincide within 0.1 mm.

e) Time determination

-10A rubidium time standard is used, with 10 stability approximately.

A Hewlett-Packard counter, with + 1 ns resolution is used to determine time T.

The "start" and "stop" pulses, obtained from the fringe counter, are affected by

the delay-time of the circuits used, which introduce a systematic error of 5 ns +

0.5 ns in the determination of T.

In total, the uncertainty in T measurements is of + 1.5 ns corresponding to

approximately + 6 iiGal in g determination (indicated as uncertainty of d.t.c. in

the tables).

The error in the determination of t is much higher, owing to the fact that a

counter with + 100 ns resolution is used.

Yet, being

t<<T

the error on t becomes negligible.

f) Other influence factors

The presence of magnetic fields induces electrical currents in the

metal of the corner cube during flight. To avoid this effect, all the metallic parts

are made of amagnetic material.

The elastic of the catapult may have an electrostatic charge, and the

movable corner cube may be charged by residual air. The elastic is therefore

protected by a grounded metallic tube.

Moreover, if the trajectory is vertical, the tube is perfectly centred with

respect to the corner cube, so that the capacitance between them keeps constant

during flight and its effect is negligible.

No corrections were made for buoyancy or for reduction of the

wavelength of the laser light caused by residual air.

g) The measured g value corresponds to a height of -0.8 m from the

ground. To reduce it to this level, the vertical gradient of g has to be measured,

and a correction applied. Two relative gravity meters, La Coste Romberg G-131

and La Coste Romberg D-26 (for Anchorage), have been used.

The results obtained at the individual stations, together with their measurement

uncertainties, are given below. Ah represents the difference in the heights at

which the Ag gravity difference was measured.

Vertical gradient of g at the different stations

S i L e Ah (in) .g(,,Gal) Ag/A h (1 Gal/m)

Boulder .780 + .001 181 + 3 232 + 3

Alamogordo .780 + .001 245 + 2 314 + 2

Mc Donald .780 + .001 317 + 2 407 + 2

Sheridan .780 + .001 200 + 2 256 + 2

Great Falls .780 + .001 242 + 2 310 + 2

Anchorage .780 + .001 206 + 2 264 + 2

6

A typical example of the evaluation of errors is given below, as well as their

overall evaluation.

Source of error Estimated uncertainty(iiGal)

1) Laser wavelength +5

2) Beam direction +5

3) Time interval T ( +1.5 ns) +6

4) Gradient of g +2

The uncertainty in the g value is thus + 10 iGal, calculated as the square root of

the sum of the squares of the individual errors.

2. PREVIOUS IVEASUREVENTS

As was said before, 23 European sites and six in Lhe U.S. had been

determined (Figure 2).

As relevant information, the agreement of the Italian apparatus with

Sakuma's gravity meter and its repeatability are given in Tables A and B.

TABLE A Comparison with Sakuma's value of "g" at S6vres

Station, date m M(,,Gal) (1,Gal) (,,Gal)

S~vres A 3 by Sakuma 980 925 900

S vres, May 1976 980 925 892 20 2.0

S~vres, June 1976 980 925 902 17 1.8

S~vres, January 1977 980 925 896 19 2.1

Svres, March 1977 980 925 906 17 1.9

7

TABLE B Repeatability of the measurements in the same station

Station, date g§ m M

(,iGal) (,Gal) (,, Gal)

S~vres, May 1976 980 925 892 20 2.0S6vres, June 1976 980 925 902 17 1.8S6vres, January 1977 980 925 896 19 2.1Sdvres, March 1977 980 925 906 17 1.9

G9vle, July 1976 981 923 527 19 1.6G~vle, August 1976 981 923 533 17 1.9G6vle, September 1976 981 923 524 20 3.1

Torino, July 1976 980 534 256 26 3.1Torino, October 1976 980 534 251 25 4.1Torino, June 1977 980 534 259 25 2.6Torino, September 1977 980 534 259 30 3.3.

Bedford, Mass, Oct1977 980 378 671 24 2.4Bedford, Mass, Dec 1977 980 378 675 29 3.6

3. U.S. MEASUREMENTS

From May 26 to June 29, 1980 the IMGC apparatus was used in the UnitedStates. The basic criteria for site selection were the establishment of a high-precision calibration line running from Mc Donald Obs. (Texas) to GreF. Falls(Montana). Studies concerning monitoring of gravity field variations in a seismicarea suggested the observation of the site in Anchorage (Alaska).

8

The following stations were therefore selected:

Mc Danal Ohs., Texas

Alamogordo, New Mexico

Boulder, Colorado

Sheridan, Wyoming

Great Fails, Montana

Anchorage, Alaska

which are described in the Appendix.

Some comments are necessary about measurements in Alamogordo, N M, a

site already observed in 1977 with the IMGC apparatus and subsequently with

Hammond's.

Results indicated significant discrepancy between the two instruments (80,,Gal). Measurements carried out with both instruments in other sites (Bedford,

Denver) did not show the presence of systematic effects that could account for

this high discrepancy. Therefore simultaneous measurements with both instru-

ments were organized in Alamogordo in 1980, to explain this ambiguous behaviour.

The measurements in question were carried out in three days. The results

obtained by the IMGC instrument on May 31, 1980 are quite different from those

of June 2 and 3. In fact, the results of May 31 are in very satisfactory agreement

with those of 1977, whereas the results of June 2 and 3 indicate better agreement

with Hammond's instrument. In an attempt to find an environmental condition that

could have affected the 1977 measurements and those of May 31, 1980, it was

found out that in both periods a system for gyroscope testing was operating at a

few metres' distance, and that it was switched off on June 2 and 3. As the system

was of a classified character, it was not possible to have the information

necessary for thorough understanding of the interaction between the system and

the gravity meter.

The gyroscope testing system was turned on again on June 3 in the afternoon, and

once more results showed the mentioned discrepancy. Table C summarizes the

results of the various measurements.

A synopsis of the results of the measurements carried out in the United

States are reported in Tables C and D.

91

TABLE C

ALAMOGORDO MEASUREMENTS

Date 9 Reduced Error N o t e(. Gal) (,,Gal)

Nov. 3-7 1977 979 139 513 11 Gyro. Test. Syst. on

May 31 1980 979 139 516 11 " " "

June 3 1980 979 139 519 15 " " " "

June 2-3 1980 979 139 _ .4 12 " " " off

TABLE D

Synopsis of U.S. Measurements

S i t e D a t e g Reduced Error(iGal) (,,Gal)

Boulder, CO May 26-27, 1980 979 608 498 11

Alamogordo, NM June 2-3, 1980 979 139 584 12

Mc Donald Obs, TX June 6-7, 1980 978 820 097 11

Sheridan, WY June 12-14, 1980 980 209 007 11

Great Falls, MO June 17-18, 1980 980 497 412 10

Anchorage, AL June 27-28, 1980 981 928 998 10

10

ACNOWLEOGMENTS

The authors are indebted to all those who have contributed to the success

of the campaign. Particular thanks are due to

Mr. R.P. Beruff, Mr. B. Szabo and dr. J. Hammond for the logistic organization

in the U.S.

- prof. A. Bray and dr. G. Cerutti for the logistic organization in Italy.

- prof. 3. Faller and his staff for their most helpful assistance in repairing the

instrument damaged in transport.

- Mr. L. Cannizzo for his assistance in repairing the instrument.

- Mr. W. Spita for his valuable assistance during field operations.

11

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LASER Splitter Mirror

Pha C2 A)

JJApex

upward downward--

L=NN 2 LN

0T t -- B

--- Time

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co

A P P E N D I X

GRAVITY STATION 'DESCRIPTIO NJ S'i' l lt ' c t , , 1 ,

C. N'' ' I , , N:tT

USA J (i rad c-

uO.'q N 1f.'1 " 1A L I

Brass disk U$AF 7

M ,US CS 7 1/2 '

% N k fhOAR KS

1t T c stat ; on thi SO.'tU : pat of 1.j T (I-ta-ck, (.5 rtiles wce.t i~f 2b-U .

0 tr~e , soutY ot (< la, 'idi /to:,.; ., . .' I ,: .::,

:'re .,1 int institute, for labtir;, r\ A, >,' it:t :,', ':1 Mir.' " ., C' *:

TT' e W. . E S L'I nst 't C) Tr U .) L, r c t rv.

,Att

Nt I

7--l c- lx I.- Ir ,:l

- . .. Iy:COC;IC PT\'o.wcel,1jhciatRADe

'= " 0 ,"

' ' " :,- <'< . :..,........,.... 7... -.,".-......... ..... ... .- 7 ,....... ... ....

"wh T ni ch,,.A , l.* r-r§! K, -.v cq &

"'S" o . <-) Ort. 7

GRAVITY STATiON N

DESCR;P~iQN Aiite Tiii -,tt A

USA New Nc-x Io L.- 0 -1acidA%.5' N J OAO ±5 nf r

Brass, Disik D ,A -- a it~

N N~jiL

ouTt our iiitt rva 1 25 fee(-

si stt ion 1 !: aout F ir Ic- wt- t o f .~amL-ecrdO 8t l:- noT It d 0e of lc

ir Tr, !Bace in- tl~c- Ad.,a':ic d ln T:.- i al 7(e.t lalora or-v ",' 2 "1 6'igt r,.a! ion we re i.de i ii the1 ha s mr rt level In P ConC~ 10 ( t 1e 1,orTt , a -~~ , F",t

t th e 1)ansi(c-n t ) on t le rouniid Ic fr-t t pier, md wa' IetwF-t.r, the c - -t(r a nu; thIie.OFuth todigf of tie( P~ i r.

~ d 11i 2 'A

-~~d -.- - daced 1iiertial

o tr k t or),y 10 'BldF 1 2561o upper- pier I c-el J1

Basement y up" o-o~EarI lwr y d ci ramtp

Nr.-',nbCT 19/7 __j

.;* pita DMATC/GSS Novembler 1977

::,C FR l rP A C52 I TE SI L ,TIrO.~ A UQ 69 FC 1 S CtF E

A2

G RAVITY STATIO N A ,I ,N . ,, I , ,

DESCRIPTION Ai .- I SCl, *'OI io d AB

USA 1 t- Pt Davis

' 4L ( 1,J- A1 5N

No neAO, N I i i N L f ho P~ . IN A I u)N

L4_t i ° . t Ex_ i.. .. t...a. -' .. LN o rl .,, D o" ") I" I. J d. r . . .. . . . .. . . .

I V "A N 6,I TA'S

-CI f V e tE t 'nr s .,me enLs_ .ojf . Sta n

: 1 , ' , The station i.s 17 miles m , orthwest of Ft. D avi . on t. 1,oI ke at th I, T qL

Obst vvatorv. To reach from the courthouse in Ft. Davis go 1', mile - northv e'stw alos'

Texas Highway 118, then turn ri Jht and 10 southfeast 2 J Iet-< al ong Spur Road 78 toMcDoniald Ob-e rxatorv. The sta: ion is east of the top of the mountain,ar the eni: cA

the road, in the 107 inch Teleswope Building, ground levl.v Ohs rVat i ons wei- naT i7

the, nortneast side, in Room 103, 1.8 meter east of thw West wail and door of t-,,,wid 1.1 meter south of the northi wall, on the tile floor.

CSS Code: 1 9S04

Parking 107 inc-h Teltsr'opt Building

To 82 inch

telescope Road

Road/

Cro/

n- Level

}: r r2 J: -

McDonald

W.G. Spita1 DMAPTC/GSS/ I .ln q80

D-;A,-TC F(I 8250-9 (G(;S) MAR 79 Su_ rs E V R FR] 250-9 (CGSS), Ckot 77whi(:h w2-1l be use3 until stclk ise~std

A3

GRAVITY STATION !.'C Ot ,&,iDESCRIPTION AP,'<,ut Sit(- Sheri dan AE

I . S.A. W-% o n Sh( ri danl/" tr ." L (',%. lU t O!L I l[Y 1 1

45.'b N 106 ° 58.11 W 12105 Meters

(.' A1 TA! Kfr. K iAr INC- SOUk./ ,NSC ki 0N

BrzsDisk DMA {___________r (), 1o k 1 EN(C POSI ( 1'N SOU k SuC J D E S IGN Al JON

USGS 7 1/2' Sieridan, Wvc' 1968

A L)h A W'i NCi i j VA, ION SOUR(I SOURCOE D[S GNA1ON

Map USGS 7 1/2' Sheridan, Wyo 1968- IN ! i ON j, iJWAW

,

" = 20 P-.

LInv -.. jtiL'1n is abo,,T 2.) miles south of the center of sheridan, west of W'ovrinF11iriodv /3.3. a, tihe Wvorriny State Girls School, in Stolt Hall (Administration.,ui diuig). Ob-r-atie. w.i v made in the basement, east of the boiIer room, nearI ] n, r th.,st c rl r IF t ht. Iary( room used for arts and crafts, in a small st cra,,

Wln.. T'ic i ii i,. 1.I it r. , lorth of the south wall of the room, 0.9 nwter .,2 t of ; ,t wi l, i I,, r- r., wvst of "AA" (tiOt' AF(;L station), alld 2.5 n;,- vr.

1 -1t 0 1 1;1 ' 1. C 1 1 1 Ioc"l' t cif ti c .I..K i'll [~ t. ('I t it' fioor.

t Sc 1<<I : 5\U,,i4

W voning State

'.,4.a -A ,,0,C ' .( AIHGirls School

Stolt Hallw

arin Dr ive.ay. .. ... . . d ,'3 " " C'

SHERIDAI:- "F- -' ;

A I , V

boiler U'.rp- raL,,I Arts and C-aft.L 1

Stot Hall Basement

la* i vewalI 1vEwa"

;A/i- " "G-.. .t-! ,l DilI

t,.,' icr G;'' DMAIITC/G53 June 1980

F.'A"F? v ,', .- 'i ,.3i .-'A 79 Ruperseres LTPC FO1M 8250-9 (GSS), Oct 77

which will be used until stcdY is ehasted.

A4

GRAVITY STATION .

DESCRIPTION A,o]ut o S;it, (.t ,1j 1i,' A',

U.S.A. _Mnt ana i r -at Fa] ,

470 28.'7 N ill, 21.6 W 12( Met er,.1, S - I, ),,N MARI, A(,IIN' OL~. I' ,. I N

Brass Disk DMA

s -"771.-1 "INC I '(IN SC~ c '4 PN (

M'ap USGS 7 1/2' .e(,thwest Great Fa)]I ,, I :

k1 0 t I I R W I Ii Al I)N SOU1C I' t i NA I I N 6

Map USGS 7 1/2' Sout wetst (:Itat }al IIf, ,M:

C1 = 20 Feet

Te station is at the west side of Great Fal Is on Gor- Pil, south t t he p'!.,

and at the south side of the intersection of Avenue C and Seco:td t iec t , at tt-

CPI William W. Gait US Army Reserve Center. O.ervdt iotns- wt. rc r.ade ](ri'ea th,

south side of the building in the firing range, nortlt-ast end, 1.5 M't l ! ,ul

west of the middle firing stall (also 1.5 meter. fom eJdge of carpet). 1 he

stat ion is midway between the northwest and sout heas t wal , 2.0 nct- r5 ,cm i

east of the disk, on the concrete floor.

GSS Code: 156E05

CR 1A'q FALLS

L C

CPT William W.

"~P S'. R"s I v e- C el t T

A,,

W' G S ,j t a T j I D .X L R H I 'C / S S. u l ] } (

CT - .... .v . uprd5 g~ te O FOFN 825 0/Q-)9 ? av 75 which s

A')

DESCRIPTION Absol ttt Site I T .a~' AA

UAAlaska Anl'rap'e

61 1. N1490 47.'56W 7C meters

-AluminuLm Disk __ __________ __________

P S,1 ON SOUNCE SOUPCI CE 'I(,N&110N

Map ______USGS 1:25,000 Anchora~e (A-B ) NE, I 711

Map USGS 1:24,000 Anchiorage & %'icir:ty, 1"6,-

-7 Eu ta o sa 7'SIth Aof Anchiorage, about 0. 5 mi let. soutrt-a - F-the inicrsertion of Last 68th Avenue and Abbott Loop Road, at the Bureau of I.-t-nMminaF,;-ent Anchorage IDistrict Office. Observations were made in the office c:E

in. th~e rasement , wet side, in the -trage room which is southeast of thre A~~-

1-ducat iof ! oomf and ,,outhwu'st of Koom 10OB (a hallway). The station is I .'; t

fort hcst. of thkE, soutliwtest wall of the room and 1.6 Tnet ers ,outheast of the i'rt.,-!t w.-Al, CUE 10e concret e floor.

hl'MEAl OF LAND%tAN(.i'KtF.NT

2 2- n(horage District0

"RS ,{ *

0 e

which will be user3 until stock is exh,1ausited.

-A 6

w