yasumoto suzuki果&kisabur6kodama菅 - gsj.jp · (sθooπ4カαカθ7〉,sci,rep。...

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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&st 璽y Yasumoto SUzUKI果&Kisabur6KoDAMA菅 The deep structure of island arcs・bordering t:he west of been studied by many geoscientists in relation to the d and deep eεしrthq』uake foci。It is generally accepted that they a earthquake zone that dips away from thc oceanic trench (1955)classified their space distribution into two type nental and oceanic,and concluded the place where the inte qu刻kes occur is justロkind of the t五rじst plane,along whic五 抗re overriding the ooeanic ones、Rec6ntly,TAKEuCHI them by the convection current hypothesis in the uppcr tems of eart五qualke generating stresses seem to supPort aユ.1957,BALAKINA1967,RITSEMA,1957). The authors doubted.those hypdtheses and reexamined bution of hypocenters(GuTENBERG and RIcHTER,1954)a皿d ating stresses(:FARA,1964)in the Indone5ian archipelago The earthqua』ke foci in the region a!re displayed in F be concluded from these figures tha,t nearly all deep eart fined to such inland,sea・basins as Java,Flores,Banda an of those foci is relatively uniform in the r6910ns.Inte 200km depth occur along the Molucca pass and southea island arcs from Sumatr寓to Philippines many slhallow an recorded。From these data it might be concluded that the d increases continuously from the outside of the arcs to t apProximation as Berlage(UMGROvE,1949)pointed out・ 丁五e authors t五ink that this is&11a mere show。 The dist qu切ke foci is not continuous 2s supPosed from the figur there is discont血uity in the a,rca between the island arcs and T:he relative independence of seismic activity in both regio 40f the vertical NE-SW section&10ng the south of Philipp Fuel Department 1一(711)

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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)

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)

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)

 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

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)

 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

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))

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Fig.4 Schematic section of topography(upper)and earthquake foci

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