Modul Praktikum GravMag (1).docx

MODUL PRAKTIKUM

GAYABERAT DAN MAGNETIK (PTF-454) Semester 5 2016/2017

oleh: RIZKA SONI SATIAWAN

PROGRAM STUDI TEKNIK GEOFISIKA FAKULTAS SAINS DAN TEKNIK  UNIVERSITAS JAMBI 2016

ATURAN PRAKTIKUM

Aturanber!utn"buatuntu!"la!sana!an"an"#atuh: 1$ %ra!t!umnter"r"ar 5 #enlaan& 'atu: a$ Tu(as#en"ahuluan : "ber!an #aln( lambatseharsebelum#ra!t!um  b$ Tesa)al *#re test+ : "la!u!an 10 mentsebelum#ra!t!um"mula ,$ Tesa!hr *#ost test+: "la!u!anmen-elan(#ra!t!umselesaatauselama #roses  #ra!t!umberlan(sun( "$ .a#oran : "!um#ul!ansemn((usetelah#ra!t!umatausaat#ra!t!ummo"ulselan-utn'a e$ Tu(asbesar *nal #ro-e,t+ : "ber!an#a"a#en(hu-un(#ra!t!um *men-elan(a!hr  semester+ 2$ %ra!t!an"atan(men(!ut#ra!t!umte#at)a!tu$ Tolerans!eterlambatan10 m!"#$ Setelahbatas!eterlambatan&  #ra!t!anmashbolehmen(!ut#ra!t!umteta#t"a!terhtun("alam"atarha"rsertat"a!men" a#atnlatesa)al *#retest+$ $ %ra!t!anharusha"rseta##ertemuan#ra!t!um!arenat"a!a"a-a")al#en((ant#ra!t!um$ !at"a!ha"r& ma!anla 'an( "amblhan'anlala#oran$ Nla#en"ahuluan& tesa)al& tesa!hr"an((a#!$%$ !a#ra!t!anberhalan(an!arenasa!t 'an( a"asurat!eteran(an"o!teratau3n 'an( bsa"terma& ma!aa!an"ber!antolerans"en(an#en((antantesa)al& tesa!hr& tu(as#en"ahuluan 'an(  bobotn'ahan'a&0'"arnlaa!hrmo"ul 'an( berhalan(anha"rtersebut$ 4$ %ra!t!anmen(!ut#ra!t!um"en(anber#a!aanra#"anberse#atu$ 5$ %ra!t!anhan'amen(!utsalahsatu sht "ant"a!"#er!enan!anuntu!ber#n"ah#n"ah sht *!e,ual"ber!an3nsebelumn'aoleh"osen#en(am#u+$ 6$ %ra!t!anharusmemba)a la#to# seta##ertemuan 'an( su"ahternstall sot)are 'an( a!an"(una!an#a"amo"ul#ra!t!um'an( a!an"la!sana!an$ !at"a!mem#un'a la#to#&  #ra!t!anbsamemn-am la#to# teman sht lann'a$ 7$ %ra!t!anmen(er-a!antu(as 'an( "ber!anassten#ra!t!um"an"!um#ul!an#a"a#ertemuanber!utn'a *sesua sht masn( masn(+$ $ %en(um#ulantu(as#ra!t!ummen((una!an ormat la#oran 'an( telah"tentu!an$ T"a!#erlumelam#r!an,oer "e#anla#oran$ $ Keterlambatan#en(um#ulantu(as"ber!an!*+,!,!!"%," 10 seta#har!eterlambatann'a$

8ormat .a#oran:

STUDI IDENTIFIKASI STRUKTUR DAN PROSPEK  IDROKARBON BERDASARKAN METODE GAYABERAT PADA .EKUNGAN KUTAI/ KALIMANTAN TIMUR   Rizka1 , Wawan Gunawan A.Kadir 1 , Susanti Alawiyah1 , Eko Januari Wahyudi 1  Abstract   Kutei Basin is located in East Kalimantan, ndonesia. !his "asin has #aults structure, stron$ anticline #oldin$ and  wide syncline known as Anticlinorium Samarinda. !his "asin is one o# the most %roducti&e oil and $as %roducer in  ndonesia.  n this study, it has "een identi#ied the structural controls and hydrocar"on %ros%ects o# the Kutei Basin usin$   $ra&ity method. !he #aults structure "asin and delineation ha&e "een deri&ed #rom the second &ertical deri&ati&e anomaly. !hen, it has "een conducted su"sur#ace $eolo$ical modelin$ usin$ $ra&ity #orward and in&erse modelin$  to determine disti"ution o# su"sur#ace density contrasts. !he so#tware used Encom'odel(ision )ro &ersion *.+ #or   #orward modelin$ and Gra&- B/0G #or in&erse modelin$. !he #inal result o# modelin$ are the contour ma% o# to% "asement and sediment thickness.  Based on $ra&ity anomaly can "e analyzed that Kutei Basin has #aults structure with almost 2E0SW direction. !he  structures are re&erse #aults and wrench #aults. t can "e identi#ied that there are two su"0"asins in Kutei Basin, i.e. %%er Kutei Su"0Basin with continental "asement and 3ower Kutei Su"0Basin with oceanic "asement. Based on  $ra&ity modelin$, it can "e estimated the density contrast o# "asaltic rocks in oceanic "asement is +.14 $r5cc and   $ranitic rocks in continental "asement is +.+4 $r5cc. Kutei Basin has dee% to% "asement with ma6imum sediment  thickness are a%%ro6imately *.7 km. Su%%orted "y $eolo$y data and hydrocar"ons %lay, the Kutei Basin could "e as hydrocar"on %ros%ects area.  Keywords8

$ra&ity, Kutei Basin, second &ertical deri&ati&e, #orward modelin$,  Encom'odel(ision )ro &ersion *.+, to% "asement, hydrocar"ons

in&erse modelin$,

 Sari  /ekun$an Kutai terletak di %ro&insi Kalimantan !imur, ndonesia. )ada %enelitian ini, dilakukan identi#ikasi  struktur dan %ros%ek hidrokar"on /ekun$an Kutai den$an men$$unakan salah satu metode $eo#isika yaitu metode  $aya"erat. nter%retasi struktur sesar dan delineasi cekun$an dilakukan den$an men$$unakan turunan te$ak orde dua. -istri"usi kontras densitas model "awah %ermukaan den#$an metode %emodelan ke de%an dan %emodelan in&ersi.

 Kata kunci8 $aya"erat, /ekun$an Kutai, turunan te$ak orde kedua, %emodelan ke de%an, %emodelan in&ersi,  'odel(ision )ro &ersion *.+, , to% "asement, hidrokar"on. 19

 )ro$ram Studi !eknik Geo#isika, nstitut !eknolo$i Bandun$. Email8 rizka#:;$mail.com

I PENDAULUAN

%eneltan n "la!u!an #a"a 9e!un(an Kuta& Kalmantan Tmur& In"onesa$ 9e!un(an Kuta meru#a!an ,e!un(an se"men terluas "an ter"alam " In"onesa ba(an tmur *Sat'ana et  al $& 1+$ .uasn'a men,a#a 165$000 !m2 "an !etebalan se"men 1214 !m$ 9e!un(an Kuta meru#a!an salah satu  #en(hasl mn'a! 'an( #aln(  #ro"u!t " In"onesa "an meru#a!an

,e!un(an e!onoms 9e!un(an uma$

!e"ua

setelah

;eto"e (a'aberat "(una!an untu!  men("ent!as batas ,e!un(an "an stru!tur re(onal 9e!un(an Kuta& memo"el!an ba)ah #ermu!aan  ber"asar!an nla !ontras "enstas& estmas !etebalan se"men "an !e"alaman to% "asement & member!an

re!omen"as area #ros#e! h"ro!arbon untu! e!s#loras lebh lan-ut$

meto"e #emo"elan !e "e#an "an  #emo"elan ners$

II TEORI DASAR 

V KESIMPULAN

II METODOLOGI

1$ 2$

%eneltan n "la!u!an "en(an  bebera#a taha#an 'an( "a#at "lhat  #a"a
DAFTAR PUSTAKA

1

2

 4

5


IV ASIL DAN PENGOLAAN DATA %a"a #eneltan n "ata 'an( ""a#at a"alah "ata hasl anomal 9=A */om%lete Bou$uer Anomaly + 'an( sebelumn'a su"ah "la!u!an !ore!s$

7



IV ANALISIS %a"a #eneltan n& #enuls membuat mo"el ba)ah #ermu!aan "en(an

=la!el'& R,har"$$ 15& )otential  !heory in Gra&ity and 'a$netic  A%%lication& 9ambr"(e >n %ress e#artemen ?S;& =a"an %eneltan "an %en(emban( ?S; %usat %eneltan "an %en(emban(an nerst' o .on"on Ka"r& W$<$A$& 2000&  Eks%lorasi Gaya Berat < 'a$netik : urusan Te!n! ydrocar"on  >a"itats o# !he Barito, Kutai and  !arakan Basin, Eastern  Kalimantan, ndonesia? 'a@or 

 -issimilarities& ournal o Asan ?arth S,en,es S#e,al Issue ol$ 17& No$ 12& ?lseer S,en,e& OBor" 120



Telor"& ;$W$& n %ress

MODUL 1 TEKNIK PENGAMBILAN DATA DAN PEMBA.AAN ALAT GAYABERAT SASARAN 1$ a#atmen(a!uss"anmen(ambl "ata (a'aberatba! 'an( "u!ur#a"a base mau#unla#an(anC 2$ a#atmen(!onerss!ala"ar"ata alat(a'aberat $ a#atmen(!oners!oor"natlattu"e "an lon(tu"e "e(ree !e >T; atausebal!n'a 4$ a#atmenentu!aneleassuatutt!"ar "ata #en(u!uran altmeter  5$ a#atmen(htun(!ore!s t"al obseras"anteorts ALAT ,! BAAN 1$ .a#to# 2$ A#l!as ;s$ ?B,el $ Sot)are
A = 9 9ounter Rea"n( alue *m
9

(,,,%,#-

Stasu n =ase 901 902 90 904 905 906 907 90 90 910 911 912 91 914 915 916 =ase

B *bu-ur+ ' *lntan(+ Tme 10E40F20$6G 7E2F47$1G :5 10EF21$G 7E2F22$4G :4 10:2 10EF24$G 7E2F2$0G 0 10EF2$G 7E2F27$1G 11:04 10EF2$6G 7E2F2$2G 11:20 10EF$2G 7E2F2$4G 11:44 12:0 10EF4$G 7E2F6$5G 0 12:1 10EF45$G 7E2F$0G 2 12:2 10EF4$G 7E2F40$2G  1:1 10EF51$5G 7E2F41$7G 2 1: 10EF56$G 7E2F45$2G 1 1: 10EF5$2G 7E2F47$4G  1:5 10E40F04$6G 7E2F51$4G 5 14:0 10E40F12$G 7E2F54$7G  14:2 10E40F14$4G 7E2F5$4G 4 14: 10E40F17$2G 7EF00$4G 2 14:4 10E40F22$5G 7EF0$G  15:0 10E40F20$6G 7E2F47$1G 7

=a,a Alat 145$65 11$51

S!ala

12$71 146$662 14$04 151$12 151$21 150$725 14$515 150$25 14$26 14$57 14$25 14$16 14$7 14$772 146$51 146$1

2 K$!+3"K$$+"!,# L,#"#* ,! L$!"#* @tun(!oners lattu"e "an lon(tu"e "ata Tabel 1 "en(anmen((una!an sot)are
Surer$A"a#unlan(!ah#en(er-aann'aseba(aber!ut: 1$ >bahs!ala!oor"nat#a"aTabel 1 men-a""esmal"en(anmen((una!an;s ?B,el$ 9ontoh: 10E40F20$6G H 10*40/-umlahment"alam 1 -am+*20$6/-umlah"et!"alam 1  -am+ H 10*40/60+*20$6/600+ H 10$672 2$ =u!a
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!oor"nat"esmal!e )or!sheet #a"a sot)are Surer   ata Ne) %ro-e,te" 9oor"nates >bah sour,e ,oor"nate s'stem  #lh #re"ene"  (eo(ra#h, *lat/lon+ 

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 #lh )orl" (eo"et, s'stem 14

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OK

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!emu"anubah tar(et ,oor"nate s'stem

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 #lh #ro-e,te" s'stems

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 #lh >T;

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  Asa

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  In"onesa

In"onesa >T; Zone

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4S  OK OK  $ ata >T; a!anmun,ul#a"a!olom  "an 4$ Setelahtu ,o#' #aste "ata >T; !e "ata Tabel 1$ 

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= M!;"#*!E%,3" (K#"!",!) Ketn((ansuatu#oss " #ermu!aanbumterha"a# "atum tertentubsa"u!ur"en(anbebera#aalat& salahsatun'a altmeter$%en(u!urannla!etn((an"en(an altmeter "#en(aruhbebera#aa!tor& "antaran'atem#eratur"ante!anan$Nlan'aa!anberarasterha"a#)a!tuuntu!#en(u!uran#a"a#o ss 'an( teta#& sehn((a"#erlu!an!ore!suntu!men"a#at!annlato#o(ra 'an( sesua$ alamsuatusure(a'aberat& #en(u!urannla!etn((anmemerlu!anset"a!n'a 2 altmeter$Satu altmeter "(una!anuntu!men(u!ur " base "an 'an( lann'auntu!men(u!ur " stasun(a'aberat$ =er!uta"alah "ata #en(u!uran altmeter " base "an " stasun(a'aberat$ T,% 2 ata eleas

tme 0:20 0:25 0:0 0:5 0:40 0:45 0:50 0:55 0:00 0:05 0:10 0:15 0:20 0:25 0:0 0:5 0:40 0:45 0:50 0:55 10:00 10:05 10:10 10:15 10:20

alt 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

P!*7*+,! " ,3 (m) tme alt tme 10:25 0 12:0 10:0 0 12:5 10:5 1 12:40 10:40 1 12:45 10:45 1 12:50 10:50 1 12:55 10:55 1 1:00 11:00 1 1:05 11:05 2 1:10 11:10 2 1:15 11:15 4 1:20 11:20 5 1:25 11:25 5 1:0 11:0 6 1:5 11:5 7 1:40 11:40  1:45 11:45 10 1:50 11:50 10 1:55 11:55 11 14:00 12:00 12 14:05 12:05 12 14:10 12:10 1 14:15 12:15 15 14:20 12:20 15 14:25 12:25 14 14:0

alt 15 16 15 17 17 17 2 22 2 2 25 25 26 26 27 27 27 27 27 27 27 27 27 2 2

tme 14:5 14:40 14:45 14:50 14:55 15:00 15:05 15:10 15:15 15:20 15:25 15:0 15:5 15:40 15:45 15:50 15:55 16:00 16:05 16:10 16:15 16:20 16:25 16:0 16:5

alt 2 27 26 26 26 25 25 25 25 24 25 25 24 2 2 22 22 21 21 21 21 21 22 22 22

T,% =%en(u!uran " la#an(an %en(u!uran " la#an(an *h=aseH15 m+ Sts

tme

=ase

Δt

Δt

*s+

alt*m+

!or alt

:42

0

2$4

ST1

:51

0

2$01

ST2

:5

0

2$7

ST

10:14

0

2$724

ST4

10:5

1

2$267

ST5

10:40

1

2$12

ST6

10:44

1

2$01

ST7

10:5

1

1$545

ST

11:14

1

1$057

ST

11:2



0$5

ST10

11:5

45

0$416

ST11

11:55

47

0$057

ST12

12:12

55

0$21

ST1

14:54

12

17$67

ST14

15:0

15

21$524

ST15

15:1

117

25$16

ST16

15:2



2$

ST17

15:40

2

$20

ST1

15:5

57

$

=ase

16:07

26

45$665

h !ore!s

"strbuseror

h lo!al

h semu

true h*m+

A"a#unlan(!ah#en(er-aann'a: 1$ Tambah!an!olomTabel 2 men-a" 4 !olom$ Is !olom 2 "en(anmen(ubah)a!tumen-a"ment *m+$ Is !olom  "en(anrumus H t!en J t1 $,ontoh : t1H 500 ma!aΔt H t1  t1 Tabel 4 @asl#en(u!uran altmeter #a"a base P!*7*+,! " ,3 (m) tme tme *m+ Lt *m+ alt 0:20 0 0:25 1 0:0 1 0:5 0 0:40 0

0:45 0 0:50 0 0:55 0 0:00 0 0:05 0 "st 2$ %lot Δt s altmeter$ manaΔtseba(asumbuB "an altmeter seba(asumbu '$ $ .a!u!an#en"e!atan #ol'nomalsehn((a""a#at!an#ersamaan#olnomal$ 9aran'a!l!!anan#a"att!#en(u!uran  #lh a"" tren"lne  #lh #ol'nomal or"e  #ol'nomal ",o,o!an"en(an "ata 'an( a"a *msal: or"e + ,entan( "s#la' eMuaton on ,hart  ,lose 4$ .en(!a#Tabel  Kolom  *Δt+: H t base la#an(an J t base 'an( "u!ur " base Kolom 4: men(!oners!olom  !e"et!  Kolom 6: masu!an#ersamaan #ol'nomal #a"ahasl#erhtun(an altmeter base Kolom 7: h !ore!sH alt J !or alt 









Kolom :

 Distribusi error =

( Kor Alt 

akhir

(

waktuakhir

− Kor Alt  ) ∗( waktu − waktu ) awal

ke − n

−waktu

awal

awal

Kolom : h lo!al H h !ore!s!en J h !ore!sa)al Kolom 10: h semu H h base  h lo!al Kolom 11: true h H h semu J "strbus error  Cuntu!men(e,e!!ebenaran true h a"alahnla h a)al"an h a!hrsama"en(an h base 4 P+;"#*!,!7$+73" #",% K$+73" T",% T$+"#"3 ;en((una!an sot)are TI?$?D?

=u!a sot)are TI?$?D? .en(!a#"atan'aseba(aber!ut:

)

:

K$+73" T",% O3+,3" T,% 5 T"al obseras Tme

T9*m(al +

:

0$14

:44

0$144

:56

0$14

:07

0$142

:14

0$141

:1

0$140

:2

0$1

:27

0$1

:0

0$17

:

0$16

:6

0$15

:

0$14

:42

0$1

:44

0$12

:47

0$11

:4

0$10

:51

0$12

:5

0$12

:55

0$127

:57

0$126

:5

0$125

10:01 10:0

0$124 0$12

Tme 10:0  10:11 10:1  10:1 4 10:1 6 10:1  10:1  10:2 1 10:2 2 10:2 4 10:2 5 10:2 7 10:2  10: 0 10: 1 10:  10: 4 10: 6 10: 7 10:  10:4 0 10:4 1 10:4

T9*m(al +

T9*m(al +

Tme

T9*m(al +

Tme

T9*m(al +

0$0

11:21

0$067

11:51

0$041

0$02

11:2

0$066

11:52

0$040

0$01

11:24

0$065

11:5

0$0

0$00

11:25

0$064

11:54

0$0

0$0

11:26

0$06

11:55

0$07

0$0

11:27

0$062

11:56

0$06

0$07

11:2

0$061

11:57

0$05

0$06

11:0

0$060

11:5

0$04

0$05

11:1

0$05

11:5 12:0 0 12:0 1 12:0 2 12:0  12:0 4 12:0 5 12:0 6 12:0 7 12:0  12:1 0

0$0

12:11 12:1 2 12:1  12:1

0$022

0$111

Tme 10:4  10:5 0 10:5 1 10:5 2 10:5 4 10:5 5 10:5 6 10:5  10:5 

0$110

11:00

0$04

11:2

0$05

0$10

11:02

0$0

11:

0$057

0$10

11:0

0$02

11:4

0$056

0$107

11:04

0$01

11:5

0$055

0$106

11:05

0$00

11:6

0$054

0$105

11:07

0$07

11:7

0$05

0$104

11:0

0$07

11:

0$052

0$10

11:0

0$077

11:40

0$051

0$102

11:10

0$076

11:41

0$050

0$101

11:12

0$075

11:42

0$04

0$100

11:1

0$074

11:4

0$04

0$0

11:14

0$07

11:44

0$047

0$0 0$07

11:15 11:17

0$072 0$071

11:45 11:46

0$046 0$045

0$11 0$11 0$117 0$116 0$115 0$114 0$11 0$112

0$02 0$01 0$00 0$02 0$02 0$027 0$026 0$025 0$024 0$02

0$021 0$020 0$01

Tme 12:1  12:2 0 12:2 1 12:2 2 12:2  12:2 4 12:2 5 12:2 6 12:2  12:2  12:0  12: 1 12: 2 12: 4 12: 5 12: 6 12: 7 12:  12:0 4 12:4 1 12:4 2 12:4  12:4

T9*m(al + 0$015 0$014 0$01 0$012 0$011 0$010 0$00 0$00 0$007 0$006 0$005 0$004 0$00 0$002 0$001 0$000 0$001 0$002 0$00 0$004 0$005 0$006 0$007

Tme 12:0 5 12:5 1 12:5  12:5 4 12:5 5 12:5 7 12:5  12:5  1:0 1 1:0 2 1:0 4 1:0 5 1:0 6 1:0  1:0  1:11 1:1 2 1:1 4 1:1 5 1:1 7 1:1  1:0 2 1:2

T9*m(al +

Tme

T9*m(al+

Tme

T9*m(al+

0$011

1:2

0$07

14:25

0$06

0$012

1:2

0$0

14:0

0$064

0$01

1:1

0$0

14:5

0$065

0$014

1:

0$040

14:42

0$066

0$015

1:5

0$041

15:14

0$065

0$016

1:6

0$042

15:21

0$064

0$017

1:

0$04

15:26

0$06

0$01

1:04

0$044

15:1

0$062

0$01

1:42

0$045

15:5

0$061

0$020

1:4

0$046

15:

0$060

0$021

1:45

0$047

15:41

0$05

0$022

1:47

0$04

15:45

0$05

0$02

1:4

0$04

15:47

0$057

0$024

1:51

0$050

15:05

0$056

0$025

1:5

0$051

15:5

0$055

0$026

1:55

0$052

15:55

0$054

0$027

1:57

0$05

15:57

0$05

0$02

1:5

0$054

16:00

0$052

0$02

14:01

0$055

16:02

0$051

0$00

14:04

0$056

16:0

0$050

0$01

14:06

0$057

0$02 0$0

14:0 14:12

0$05 0$05

10:04

0$122

10:06

0$121

10:0

0$120

 10:4 4 10:4 6 10:4 7

0$06

11:1

0$070

11:47

0$044

0$05

11:1

0$06

11:4

0$04

0$04

11:20

0$06

11:4

0$042

4 12:1 5 12:1 6 12:1 7

0$01 0$017 0$016

5 12:4 6 12:4 7 12:4 

0$00 0$00 0$010

1 1:2  1:2 5 1:2 6

0$04

14:15

0$060

0$05

14:1

0$061

0$06

14:21

0$062

.an(!ah!er-a: 1$ Tambah!an!olomTabel 5 men-a"  !olom$ Is !olom 2"en(anmen(ubah)a!tumen-a""et! *s+$ 2$ %lot t*s+ s T9$ mana t*s+ seba(asumbuB "an T9 seba(asumbu '$ $ .a!u!an#en"e!atan #ol'nomal sehn((a""a#at!an#ersamaan#olnomal$ 9aran'a!l!!anan#a"att!#en(u!uran  #lh a"" tren"lne  #lh #ol'nomal or"e  #ol'nomal ",o,o!an"en(an "ata 'an( a"a *msal: or"e + ,entan( "s#la' eMuaton on ,hart  ,lose 4$ .en(!a#Tabel 6 "en(anmemasu!an#ersamaan #ol'nomal Kolom : Δt H t!en J ta)al Kolom 4: ubah!olom  !e"et!  Kolom 5: masu!an#ersamaan #ol'nomal "en(an B "ata Δt *m+ 







Sts =ase LAPORAN

Tabel 6 @aslKore!s T"al Obseras Δt Δt *m+ tme t"e ,orre,ton :2 :51 :5 10:07 10:06 10:25 10:42 10:5 11:0 11:1 11:2 11: 11:56 12:16 12:55 1:04 1:16 14:0 14:0 14:15 14:21 14:26 14:5 14:41 14:4 14:55 15:1



1$ 2$ $ 4$

;en(!oners s!ala alat$ ata "ber!an saat #ra!t!um ;en(!oners !oor"nat lon(tu"e "an lattu"e$ ata "ber!an saat #ra!t!um ;en(htun( eleas$ ata "ber!an saat #ra!t!um ;en(htun( !ore!s t"al teorts$ Suatu #en(u!uran (a'aberat " *!otasesuaabsen+ #a"a 1 Se#tember 2016 "la!u!an se-a!   -am $00 sam#a -am 16$00 )a!tu setem#at*sesua!an "aerahn'a "en(an lo!as WI=& WITA atau WIT+$ =uatlah !ura untu! !ore!s t"aln'a "en(an men((una!an sot)are TI?$?D?& !emu"an tentu!an nla !ore!s t"al untu! seta# stasun #en(u!uran (a'a  beratn'a *Nama stasun "an )a!tu #en(u!urann'a "ber!an saat #ra!t!um$ %embulatan sam#a  an(!a "esmal$+ %rnt s,reen #eta lo!as "ar