Page 1
報 文
550、348:.550.343.4(1~925.9)
鉱癒e:De聯Sもr眼et麗ean題:P艶cess・i銀漁e亘sl蹴亟A寒eso墨So聰施e&stAsia
璽y
Yasumoto SUzUKI果&Kisabur6KoDAMA菅
The deep structure of island arcs・bordering t:he west of the Pacific basin has
been studied by many geoscientists in relation to the distribution of intermediate
and deep eεしrthq』uake foci。It is generally accepted that they are located in a certain
earthquake zone that dips away from thc oceanic trench to the continent。 BENI6FF
(1955)classified their space distribution into two types,namely marginal conti-
nental and oceanic,and concluded the place where the intermediate and deep e&rt:h-
qu刻kes occur is justロkind of the t五rじst plane,along whic五the continental blocks
抗re overriding the ooeanic ones、Rec6ntly,TAKEuCHI and、UYEDA(1965)explained
them by the convection current hypothesis in the uppcr mantle』The regional pat-
tems of eart五qualke generating stresses seem to supPort these五ypotheses(H6NDA et
aユ.1957,BALAKINA1967,RITSEMA,1957).
The authors doubted.those hypdtheses and reexamined the data on the distri-
bution of hypocenters(GuTENBERG and RIcHTER,1954)a皿d the earthqualke gener-
ating stresses(:FARA,1964)in the Indone5ian archipelago・
The earthqua』ke foci in the region a!re displayed in Figs・1,2and3.It:mig五t
be concluded from these figures tha,t nearly all deep earthquake epicenters are con-
fined to such inland,sea・basins as Java,Flores,Banda and celebes seas・The depth
of those foci is relatively uniform in the r6910ns.Intermediate earthquakes about
200km depth occur along the Molucca pass and southeast of Mindanao。AIong the
island arcs from Sumatr寓to Philippines many slhallow and intermediate shocks are
recorded。From these data it might be concluded that the d.epth of the hypocenters
increases continuously from the outside of the arcs to the continent in the first
apProximation as Berlage(UMGROvE,1949)pointed out・
丁五e authors t五ink that this is&11a mere show。 The distribution of earth-
qu切ke foci is not continuous 2s supPosed from the figure drawn by Ber12rge but
there is discont血uity in the a,rca between the island arcs and the in1&nd sea basins。
T:he relative independence of seismic activity in both regions might be re裂d from:Fig,
40f the vertical NE-SW section&10ng the south of Philippines.
* Fuel Department
1一(711)
Page 2
ξ
地質調査所月報 (第20巻第三11号)
丁五e opinion might be substantiated by the radi3tion pattem of earthquakes
in both regions(Figs・6,7,8). The earthquε血e generating stresses in the inland sea
basins arechar3cterized by the gener&l tendency that thc maximum compression島xes
are nearly vertic&1and theirhorizontal cσmponents are roughly parallel to the island
arcs,on the other hand the maximum tension axcs are nearly horizontal and perpen-
dicular to t:he arcs.The generating stresses of earthquakes along the island&rcs are
in a striking contrast to those in the inland sea basins.They are generally charac-
terized by the horizontal cQmponent of maximum comprcssion axes to be perpen-
dicular to the island arcs and that of maximum t6nsion乱xes to be p&rallel to them,
as many authors pointed out already。Along the Molucca pass the maximum com-
pression axes are p6rpendicular to the topographic21fea,tures as seen from Fig.6,
Those phenomena stated above mi帥t be very difficult to be explained either
by the thrust plane hypothesis or the convection current hypothesis。The authors
thi曲thattheseis血ic⑳ctivityisrelativelyindependentineachtect・nicunit。f
islandsandinlandse&basins・Thissh・ws㌻hedeepPr・cessesineachtect・nicunitare
re1εもtively independent,so the crustal defo皿a・tion should be explained by t五e deep
process beneath each unit。The current hypothesis supposed by VENING MEINEsz
(1954)must be至ejected.
Itissaidthattheinlandse屍basinsaref・㎜edint恩ey・ungge・1・gictime
(BELoussov et a1・1961・van BEMM:ELEN:1954)&nd.the process is now in progress!.
The intermediate and d、eep seismic activities in the basins would be related to the
oceanization which is very important in the recent geotectonic movement.The hori-
zontal tension state may be explained by the process.The s㎝e conclusion came
from the study of seismic activity in the Japanese islands(Y.suzuK:1,1968a,b)
The acknowledgement:The authors are grateful to Dr。M。IcHIKAwA,the
Meteorological Agency,for his many valu易ble suggestions、
Re露e疋e眼ees
BALAKINA,L.M.,vvEDENsKAYA,A.v.,MlsHARINA,L.A.&sHIRoKovA,E,1.
(1967)3Th6sケ6ss5云α≠θ 勿z(3σ7オh(1z6σ々βノリoズσπ4オhθθ1σsあo sケ65s∫泥14
げ♂h60α7云h・Izv。Earth Physics,.6,P3~15 (English trans1,).
:BELoussov,V.V.&RuDITcH,E.M.(1961):1吻%4粥s初渉h64粥lo鋼翻げ 哲hε召{z7云h,s s♂グ%o♂%ダε(6s1う60乞αZJy ズ勿:哲h召7召gJo銘oヅノαメ》ごz銘α館4 ≠h召 S召αoプ’
oゐんo渉sゐ).Jour.Geo1。 10,P.647~658。
BENloFF,H。(1955) : Sεゑs錫zづ0 6zノづ4θ%06/b7 0■%s≠o:J s≠プz60♂%グ6 σ%4 ♂θo渉o銘づo σo云」∂♂凌ソ
Ge・1.S・c.Amer.,Spec.Paper62,P。61~74,
FARA,H』D.(1964):14%刎oα観09%6げ6σ7オ勿%擁6力%諺μ翻6soZ%吻銘5,Bu11.
Seismo1・Soc・Amer・,54, P。1491~1517。
GuTENBLRG,:B.& RlcH:TER,C。F,(1954)=S6珈Zo吻oゾ渉hθ召召7≠hσ%4σ5soo宛≠θ4
2一(7二2)
Page 3
On the Decp Structure and Process in the Island Arcs of Southeεst Asia(Y.SuzuKI&K.KoDAMA)
カh碗o耀郷。Princeton Univ。Press,N.」,
HoNDA,H.,MAsATsuK:ム,A.&EMuR為,K,(1956):0瞬ho耀ohα酪挽げ伽64γオh
{2%σゐ6s σ銘4 診h6 sケ6ss65 カ〆04%oJ%9 診h6盟z勿zノ功りσ% σ%4 宛s z雇o勿zズ麦y
(sθooπ4カαカθ7〉,Sci,Rep。,T6ho:ku Univ・, Ser.5,Geophys・8,P.186
~205.
RITsEMA,A,R.(1957):0%漉6∫ひoα1吻60hα吻s卿6ゾso麗ho45ぬ4s毎銘6σ甥勿%盈6s.
Pub.Dominion Obs.,Ottawa,20,p,341~368.
SuGIMuRA,A,&UYED為,S.(1967):A汐oss必16σ吻soかoρツげオhθゆρ6γ吻σ初16
σooo%撹勿g∫0746の6σグ∫hg%嬬6∫σ%Zオ初βTectonophysics,5,P.25~33,
Suzu:KI,Y.(1968a)3S6広s郷づo窃ヅ催4孟θo渉09脇θsゑs伽痂θノ砂σ%θsθ歪s勉n4sσ%4オhθか
多z6忽勉60z67hoo4.Rep。Gも01.surv.Japan,no、228,P.1~33.
SuzuKI,Y.(1968b)3Eαπh(1%σゐ696%6グσ渉i躍95か6ssσ%47θoωz∫oグ%s≠σ1 46プ∂〆盟zσ云勿n
伽08撹昭1みz加銘、Bu11,GeoL Surv。Japan,19,p。519~528。
TAK:EucHI,H.&UYEDみ,S,(1965)=∠4カoss弼1薦ツoゾか6s6痂一伽ツグ6却o鰯1卿6齢一
卿θゆ加s卿.Tecto:nophysics,2, p.59~68.
uMGRovE,J.H.F.(1949):sオ剛o≠%γαJ h魏07y o∫孟h6昭s61銘伽s。cambridge
Univ,Press.VAN BEMMELEN,R W・(1954)3!吻観励%6%ズ14iπg Martinus Nijhoff,Hague,
VENING MEINEsz,F、A.(1954);1%40%6s宛銘α70hゆ61σ90=σ 960ρ勿sづ6σl s伽み
Bu1L Geo1.Soc,Amer。,65,p.143~164。
東南アジアの島弧の深部構造とそこでの変化過程について
鈴木尉元 小玉喜三郎
要 旨
東南アジアの島弧の震源分布と発震機構の資料を再検討した。その結果,深発地震の震央は,
弧内海盆にその分布が大体限られること,その中ではあまり深度変化はみられないこと,これと
浅~中発地震の発生する島弧の震源とは不連続的に移りかわると考えられることを述べた。発震
機構の資料によると,弧内海盆に起こる地震の起震歪力と島弧のそれともきわめて対照的で,従
来,対流説がよりどころとしていたような分布をとらないことをのべた。
Table1
Dateday.m.y.
04.06.30
28.03.31
24.06.33
24.06.33
10.04.34
10.04.34
29.06.34
Epicentral coordinates
06.5S 128.5E.
07. S 129.5E。
05.OS 104.2E.
05.OS 104.2E.
07.S116.E.07.OS 116.OE.
06.7S 123.7E.
Depth(R)
06
01
00
00
00
00
11
Mag.
7.5
6.8
Pres Tens NuH (Azimuth,Plunge)
S25W22 S89E45 N48W37
S10W15 S87E25N52W60S14W18 N35W63 S83E18N32E12 S46E45 N69W43
S55W2N35W6 S53E83S55WO2N35WO6 S53E83N38E34 S32E27 S87W44
3一(713)
Page 4
Dateday.m.y.
04.10.35
25.11.35
28.12.35
20.01.36
28.04.36
08.05.36
10.06.36
23.08.36
23.08.36
05.04.37
01.07.37
11.08。37
11.08.37
27.09.37
01.02.38
01.02.38
08.04.38
18.08.38
18.08.38
25.08.38
20.10.38
15.11.38
15.11.38
21.12。39
21.03.40
21.03.40
28.03.40
28.03.40
18.06.40
22.06.40
22.09。40
22.09.40
07.10.40
31.01.41
04.02.41
25.02.41
26.06.41
26.06.41
17.09.41
27.11.41
08.04.42
08.04.42
28.05.42
25.07.42
29.07.42
29.07.42
地質調査所月報 (第20巻第11号)
Epicentral coordinates
06.NO5.5N
OO.2S
O6.NO6.5S
O5.7S
O5.5S
O6.NO6.ON
O1.SO3.ON
O6.5S
O6.5S
O8.8S
O5.SO5.OS
O6.OS
O3.8S
O4.OS
O5.OS
O9.2S
O4.8S
O5.OS
OO.
10.5S
10.5S
14.5N
14.2N
O5.4N
OO.
08.ON
O7.5N
O5.NO6.5S
O9.NO9.S12.5N
12.5N
OO.1N
O6.6S
13.2N
!3.2N
OO.
11.5N
O2.7S
O2.8S
125.E.
094.OE.
098,0E.
127.E.
129.E.
112.7E.
147。E.
095.E,
095.OE.
133.E.
096.OE.
116.5E.
112.7E.
110.8E.
131.5E.
131,5E.
094.5E.
102.8E.
103.OE.
102.OE.
123.OE.
098。9E.g
O99.OE.
123.E.
107.5E.
107.5E.
120.5E.
120.5E.
123.OE.
122.5E.
124.OE.
123.5E.
126.E.
128.5E,
124.E.
125.E.
092.5E.
092.5E.
122.7E.
121.1E.
120。5E.
120.5E.
124.E.
124.5E.
127.7E.
127.8E.
Depth(R)
07
00
00
01
03
09
02
01
00
01
01
09
09
00
00
00
01
01
01
00
01
00
00
02
00
00
02
02
08
03
10
10
01
03
09
02
00
00
03
07
00
00
01
01
00
00
Mag.
6.5
7.9
7.3
6.7
7.2
8.2
6.0
6.9
6.9
6.5
6.8
6.8
8.1
7.0
Pres
4一(714)
Tens Null(全zimut至》P垣nge)
N50W52 S84E33S5E60N65W16S27E13 N58E22N40E l S50E7
N2W43 S81W7N18E78 S18W12N56E 2 S33E31
S10E O N80E44
S 9E 4 N77E42
S10E18 N78E8S28E69 N24E14S50W57 N10W18S l1W66 Nl1E24
S14E17 N74E8S6W4 S85E10S6W4 S85E10S67E19 S26W9N30W18 S30E72N64W工O N43E58
N36W21 S52W4S20W44 N55W15
S36E13 N45E35
S13E14 N30E71S67E6 N23E lS67E6 N23E lN88W l N3E24N88W l N3E24N45W88 S45EO2S3E l N86E58
S5E68N72E5N16E47 S82W21
N13E46 S71E5S8W52 N26W33N39E71 N58W2S4W23 N77E34N34W40 S34E50N28E41 S37W48
N36E46 S52E2S79E51N18W22S53E13 N34E15S53E13 N34E15S13E16’N75E5S66W18 N23W l
SOOW85NOOWO5SOOE85 NOOWO5
S17W17N33E24N88W62N61W83S17E46N72W O
N37W59S80W46S85W48N35W71N70W16N89E27N79W O
N41W71N61W79N61W79N40W69N60E O
S20W30S48E68
N49E43S38E78S71W52S80W12
N73W84N73W84S IE66
S IE66
N45E O
S87W32
N20W22S24E36S24W44N75E17S32W19N60W47N56E O
S58E5S40W43S58W31S75W70S75W70
N31W73N69E72N90E O
S90W O
Page 5
On the Deep Structurζ,and Process in the Island Arcs of Southeast Asia(Y.SuzuKI&K.KoDAMA)
Dateday.m・y・
01.04.43
01.04.43
25.05.43
25.05.43
08.06.43
09,06.43
30.06.43
06.11.43
06.11.43
26.11.43
01.12.43
05.01。44
22.03.44
31.03.44,
31.03.44
26.04.44
26.04.44
27.04.44
27.04.、44
15.11.44
15.11。44
22.04.45
09.05.45
16.10.45
16.10.45
17.01.46
17.01.46
26.03.46
08.05.46
15.06.46
10.11.46
27.05.47
27.05.47
27.05.47
27.05.47
24.01.48
24.01.48
28,01。48
01.03.48
01.03.48
27.03.49
27.03.49
23.04,49
23.04.49
23,04.49
30.04.49
Epicentral coordinates
06.5S
O6.5S
O7.5N
O7.5N
O1.OS
O1.OS
O7.SO5.7S
O5.8S
O2.5S
O4.5S
O3.5S
O8.5S
O5.5S
O5.5S
OO.7S
OO,8S
O1.SO1.OS
O4.5N
O4.5N
O5.NO7.5S
OO.
00.ON
O6.2S
O6.2S
O3,0S
OO.5S
O3.SO8.OS
O1.7S
O1.8S
O1.7S
O1.8S
11.N11.ON
O1.5N
O3.SO3.OS
O3.2N
O3.2N
O7.5S
O7.5S
O8.SO7.N
106.E.
106.OE.
127.5E.
127.5E.
101.OE.
101.OE.
122.E.
134.E.
134.OE,
100.OE.
144.E。
102.OE.
123.5E.
131.E.
131.OE.
133.5E.
133.5E.
133.E.
133.OE.
127.5E.
127.5E.
123.E.
124.E.
123.7E。
123.8E。
147.7E.
エ47.8E.
102.OE.
099.5E.
128.E.
078.OW.
135.5E.
135.5E.
135.5E.
!35.5E.
122.E.
122,0E.
126.5E.
127.2E.
127.2E.
127.7E.
127.8E.
120.7E.
120.8E.
121.E.
125.E.
Depth(R)
00
00
00
00
00
00
11
00
00
01
01
00
03
00
00
00
00
00
00
00
00
10
08
00
00
01
01
00
00
01
00
01
01
01
01
00
00
01
00
00
00
00
00
00
01
02
Mag.
7.0
7.9
7.4
7.6
7.6
7.1
7.0
7.0
7.2
7.4
7.2
7.1
7.2
6.7
7.1
7.3
7.2
8.2
7.5
7.0
7.1
Pres Tens Nul1 (Azimuth,Plunge)
N14W16N14W16N81E19N81E19S42W57S15W53N41W O
S27E33S27E33S16E12S54E13
N18W4S28E6S12E14S12E14
N37W7N37W7N16W6N16W6N35E50S35W35S30W47N39E48N18E O
S18W O
N66W18N66W18
S45W7S65W16N80E21
N83E6S30E24S30E24S22E34S22E34S31W12S31W12S68W51
S76E6S76E6N55E7N55E7N45E65S45W25S45W12
N63W1
S46W60S46W60
S8E3S8E3N64E31N47E32S49W29
S66W4S66W4N60E47
N35E4N75E32N59E30S82W14S82W14S50W24S50W24N79E37N79E37S35W40N35E55N83E29S34E15S72E38S72E38
S23W3S23W3S47E14N17W26
・S9E3S3E34S62W4S62W4、
S79W16S79W16
S60E5S60E5S27E4S18W36S18W36
S35E7S35E7S45W25N45E65S58E45S27W32
N84E24N84E24N90W71N90W71N32W10N53W15]N49E61
N18W56N18W56S84W40
N73W77S66W58S73W60N35E70N35E70N69E65N69E65S66W53S66W53N55W O
N55W O
N25W28S68W38N72W52N72W52S78E72S78E72
N20W47S52E59S88W68N15W55N19W65N19W65N gE52
N9E52N8E77N8E77N60E39
N5E53N5E53N80W80N80W80N45W O
N45W O
N34W43N29E58
5一(715)
Page 6
Dateday.m.y.
09,05.49
24.06.49
24.06.49
07.08.50
14.09.50
19.09.50
19.09.50
08.10.50
08.10.50
02.11.50
02。11・50
17.02.51
29.11.51
29.11.51
29.11.51
29.11.51
11.02.52
14.02.52
19.03.52
08.05.52
08.05.52
13.07.52
13.07.52
06.11.52
06.11.52
20.01.53
06.04.53
25.06.53
07.07.53
13.i1.53
02.12.53
01.01.54
20.02.54
03.03.54
06.06.54
02.07.54
03.07.54
20.09.54
03.10.54
02.11.54
31,03。55
31.03.55
17.05.55
17。05.55
29。05.55
29.05,55
地質調査所月報(第20巻第11号)
Epicentral coordinates
05.OS O95.OE,
06.2S 105.7E.
06.4S 105.8E.
07.5N 124.5E.
00.5N 127. E.
02, S 138.5E.
02.OS 138.5E.
04. S 128.5E.
04.OS 128.5E.
07.5S 129.E.
07.5S 129.OE.
07. S 146.E.
00.5N 120.5E。
00.5N 120.5E.60.5N120.5E.
00.5N 120.5E.
05.5S 109.8E.
07.7S 126.5E.
09.5N 126.OE.
02.5N 127. E。
02.5S 127.OE.
03.1S 127.OE.
03.1S 127.OE.
05. S l45.5E.
05.OS 145.5E.
01.5N 126.OE.
07.3S 131.OE.
08.5S 123.5E.
01.ON 100.OE.
03.5N O96.OE.
02.7S 141.5E.
09,0S 123.5E.
06.9S 124.5E.
05.5S 142.5E.
03.OS 135.5E.
13.ON 124.OE.
06.5S 105.5E.
01.5S 120.5E.
01.5S 127.5E.
08.OS 119.OE.
08.N 124.E.
08.ON 124.OE.
06.5N O94.E.
06.5N O94.OE.
10.S110.5E.
10.OS 110.5E.
Depth(R)
00
00
00
01
03
00
00
00
00
03
03
03
00
00
00
00
10
00
00
00
00
00
00
00
00
00
00
00
03
00
00
0!
09
00
00
00
01
00
00
00
00
00
00
00
00
00
Mag.
6.7
7.0
6.9
7。6
7.5
6.5
6.5
6.7
7.3
7.0
7.5
7.2
6.5
Pres Tens Null (Azimuth,Plunge)
6一(716)
S4E29 N53E45 N75W31S OW27 N71E34 N60W45
S OW27 N71E34 N60W45
S80E2 Sl1W31N7E59N6E6 S84E O S6W84S73W35N8W12 S82E52S73W35N8W12 S82E52S25E27N62E6N40W63S25E27N62E6N40W63S IW32N83W10N22E56S5W35N78W g N24E52N89E43 S29W29N39W34N18E20N81W22 S34E60N18E20 N81W22 S34E60S86:E22 S15W25 N32W55
S86E22 S15W25N32W55S35E38 N55E O N35W52
S8Ell N81E8 N45W76S15E58N75E O N15W32
S69W3 S22E9N3W81S69W3 S22E9N3W81N88E18 S40W64N8W18N88E18 S40W64 N8W18S19W O N71W14 S71E76
S19W O N71W14 S71E76
S44E50N5W33 S72W19S19E44 S76W5 N◎W46N69E O S21E8 N21W82
N67W13N52E63 S18W22N64E l N27W l S18W89
N45Wll N45E O S45E10
S9W17 N75W19 N61E64N59E47 N68W29 S4W28S56W14N33W6N78E75
N21W O
N71E l S19E l N64W88
S37W22 N37E68 N53W O
S36W46 S80E23 N7W35N65E4 S25E10 N48W79S48W9 S44E14 N9W74N44E l S45E24 N47W66
N44E l S45E24 N47W66
N71E8 S18Ell N55W76N71E8 S18Ell N55W76S17E24 N72E l N21W66
S17E24 N72E l N21W66
Page 7
On the Deep Structure and Process in the Island Arcs of Southeast Asia(Y。SuzuKI&K.KoDAMA)
Dateday.m.y。
21.08.55
15.09.55
15.09.55
10.02.57
10.02.57
10.02.57
10.02.57
10.02,57
10.02.57
11.02.57
11.02.57
23.03.57
23.03.57
16.04.57
16.04。57
02.05.57
02。05.57
22.06.57
22.06.57
24.09.57
27.09.57
25.06.58
25.06.58
15.08.58
Epiccntral coordinates
03.OS
O5.SO5.OS
10.N10.ON
10.N’
10.ON
10.5N
10.5N
10.N10.ON
O5.5S
O5。5S
O4,5S
O4.5S
O7.5S
O7.5S
O1.5S
O1.5S
O5.5N
O8.7S
O3.O S
O3.OS
O1.5N
137.5E.
134.5E.
134.5E.
126.E.
126.5E.
26.1E.
126.5E.
126.5E.
12『6.5E.
126.E.
126.OE。
131.E.
131.OE。
107。5E.
107.5E.
120.E.
120.OE.
137。E.
137.OE.
127.5E.
110.7E.
144.5E.
144.5E.
125.OE.
Depth(R)
00
00
00
00
00
00
00
00
00
00
00
01
01
09
09
09
09
00
00
00
00
00
03
Mag.
6.7
6.7
6.8
6,7
6.5
7.0
7.5
6.7
7.2
6.3
6.8
Pres Tens Null (A茎imuth,Plun蔓e)
N26E8S89E4σ
S89E40S73W12S73W12S31W13S31W13
S28W6S28W6S23W2S23W2N77E38N77E38S72E64S72E64S84E54S84E54
S82E5S82E5S42W28S14E17
S2W O
N69W35
S4W4S4W4N8W39N8W39S60E4S60E4S62E3S62E3S67E2S67E2N15W3N15W3N26W4N26W4S14W6S14W6S8W5S8W5N48W O
N74E8
S88E O
S53E54N82W50N82W50S31E49S31E49
N12E77・N12E77N IE84
N IE84
N22W87N22W87S72W52S72W52N62W25N62W25N72W36N72W36N37W83N37W83N42E62N41W71
N OE90
(after FARA (1964))
7一(7↓7)
Page 8
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On the
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Page 11
On the Deep Structure and Process in the Island Arcs of Southeast Asia(Y.SuzuKI&K.。:KoDAMA)
SW Ceしebe5 5ea Mindanao NE
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Fig.4 Schematic section of topography(upper)and earthquake foci
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F19.5Schematic section of topography(upper〉and earthquake
foci(10wer)in the region,from Celebes to Flores sea。
11一(721)
Page 12
地質調査所月報 (第20巻第11号)
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12一(722)
Page 13
On
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Page 14
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