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SA (cm/s2)
200
500
1000
2000
5000
1000
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1
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20
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100
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Port IslandTonankaiTomakomai
Period (s)
S V (c
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S D (c
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20151050
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Time (s)
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Ground number
Port Island800
600
400
200
0250200150100500
Ground number
PGA
(cm
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Tonankai400
300
200
100
0250200150100500
Ground number
PGA
(cm
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400
300
200
100
0250200150100500
PGA
(cm
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Tomakomai
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250200150100500Ground number
150
100
50
0
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250200150100500
100
80
60
40
20
0
PGV
(cm
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Ground number
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40
30
20
10
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PGV
(cm
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250200150100500Ground number
'5( ��\]/0
50
40
30
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250200150100500
SI (c
m/s
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Ground number
50
40
30
20
10
0250200150100500
SI (c
m/s
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Ground number
Tonankai100
80
60
40
20
0250200150100500
SI (c
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vV`:Z�wfZÛ�U���=�f_`�\IîUV`:L M9aWPQW YUSAYUSA a`Ð�O;<=éÆ�Rù��QW�Ñ;<=éb�S�~�|
0.97ùUgR�a�:éwf�f�time at phase t.\ time at liq.ùL��_Ze��Ñ;<=W�O;<=Ó´ a½¾9:Z���7[\]^RST�W_C��O;<= ��Å¡7�Ñ;<=7ï
vV`:�\Z³¡:L M107WÕ�¿]ûpq½¾R�\�Ñ;<=UgR�T�°Zî�fV`:L[\]^TijkWM7î�fg÷�45�T�Ó´ø7�´�Õ�¿]ûpqZ;<=T�7½¾UV`:�\Z³¡:L_Ò�;<= 7Õ�¿]ûpqZÕ�|Iî9TW�EF.ç�.��ç#7Ó´��_¿
]ûpqZ½¾Uggm\¬ef:L
3.3 ���he��q 5667W�S_:;T6aÉ]�fVÒ´�:;7ÓvVb�S�~�T½¾7�¥9��Z�
_:gm�¬�7��U¢I�UV����7W=�W�`L ª!"�eW�Õ�¿]ûpq
�maxZ½¾Ug�a�Õ�|7_:�7:;Z0.6�maxÓ´��C_vg6T¢24)I;<=78UVn
o_��U¢TG�\U� 2á»I#$4�3áøI:54\³IUV`:L�HTÓÐ7��fZëìíî�ïT��U¢7�9:¯�°¢ C2Z1/0.55W1/0.7\_vV`:%&\_vV`:L/a
�36�
d`:��U¢��TG�7Ó:�Ta�:L M117Õ�b�S�~�T�Onoø��789:|\��U¢T�°I�;<=UgJ\;<=
U_¡vgJ7³�Vî9L��a�;<=Ja��U¢Z0T�TW�Õ�¿]ûpqZ½¾9:�70.6�maxIÀ::;Z_¡vg�\IþUV`:L_Ò�MTPQW;<=½¾TnBaT|}
I ¡´EC9:gm7�¿]ûpq|TMaW;<=UgJaW��U®¢¡e0.1Iu��;<=U_¡vgJaW0.1I�V`:L�T'�W�<T23456aW��U¢T��ZY`gmMT�¡�7W[\]^��U_`LÀg�MTø7Wå��U¢TU��� ¿VîUV`:L�f7
Ó:\�PI 6aW;<=UgJT�Z©C���26aWµ���f�g6aW;<=UgJT�Z2_`�\Z³¡:L
Port Island
100
80
60
40
20
06004002000
PGA (cm/s2)6004002000
150
100
50
0
PGA (cm/s2) PGV (cm/s)
150
100
50
0150100500
Port Island Port Island
(a) =>��?PI&O
PGA (cm/s2)
50
40
30
20
10
04003002001000
Tonankai
100806040200
50
40
30
20
10
0
PGV (cm/s)4003002001000
100
80
60
40
20
0
PGA (cm/s2)
TonankaiTonankai
(b) ����?PD�&O
PGA (cm/s2)
Tomakomai50
40
30
20
10
04003002001000 50403020100
50
40
30
20
10
04003002001000
50
40
30
20
10
0
PGA (cm/s2) PGV (cm/s)
Tomakomai Tomakomai
(c) ����?VWX&O
'7( ��24f��q
�37�
À��(à�f:TW��U¢a�PI 6aW0W6é;<=JùÀgW1W6é§;<=Jù���26aW0W39é;<=JùÀgW2W61é§;<=Jù�f�g6aW0W40é;<=JùÀgW1W37é§;<=Jùa�´�§¨7Y`��7êe<`V`:L566Zµ�a�:�\I¬:\��
�U¢W5hTprT�`7Ó´Æ=UV`:XZ³¡:L PI 6aW;<=UgJT��U®¢W2á»Z��³I)m�3áøW �¡a�:LÀg�2á»
aW�¿]ûpq|W0.1W0.55��\Y`��7³VU�3áøaW0.3� T|Z©`LÚ��;<=U_¡vgJaW���U¢Z3áøTJ�¡_´�:L�feT�;<=�§;<=TijkW¡_´Ï_vVÒ´�¿]ûpq:;\��ad`g��U¢¡e;<=�§;<=I*â9:�\
W&'a�:L�T�\W���UTG�ZÉ�_�TaW_`\`Ð�\�`ÓÐL_Ò� ª
eT�HaW��U¢WÕ�¿]ûpqZ½¾Ug�ÜÃ�a+,m��fV`:Lw�a� 8�
Tomakomai
Time at PGA (s)
Port Island
1050
10
5
0
Time at PGA (s)
Tonankai250
200
150
100
50
0250200150100500
Time at PGA (s)
80
60
40
20
0806040200
'8( �[\]erst23���f���^��q
TomakomaiPort Island
Time at phase t. (s)
10
5
01050
Time at phase t. (s)
Tonankai250
200
150
100
50
0250200150100500
80
60
40
20
0806040200
Time at phase t. (s) '9( ��e������^��q
Tomakomai
Time at PT (s)
Port Island
10
5
01050
Time at PT (s)250200150100500
250
200
150
100
50
0
Time at PT (s)806040200
80
60
40
20
0
Tonankai
'10( ��rst23e��������^��q
�38�
�Kmg��U¢a��UgZ���U¢Z[¥t7_vgZ�Ñ£�_÷ÜWÆ e_¡vgL�
T÷ÜWýT567<`V�µ�a�:L ��26aW���U¢W0W60T��7êe<`VÒ´�10áøTijk�©C�:LÀg�Õ
�¿]ûpq|�¡_´êe<`V`:Z�wT��Wº»4567|¦:\��ma�:LU¡U�
;<=UgJ\;<=U_¡vgJTijkWÏ_vVÒ´�ÅW´Õ�¿]ûpq\��U¢T�
°¡e;<=�§;<=I*â9:�\Wa�_`Lf�g67<`VW��U¢Z0W407êe<`V`:�\IL�ê���26\µ�ÓÐ_÷Üa�:L 9a7H¦gÓÐ7z{T�H24)aW��U¢2á»\3áøa565TkF�I#$4�:54\
*âUV`:L;<=UgJaWº»456aW��³TJa��U¢Z2á»a�vgZ�2345678UVW��U¢WÕ�40a�´�10áøTijk�§¨7©`L�fIz{T�HT:54T�-a�:3áøa�\CC´79:TWB�Z�:\`ÓÐL
4 �������]�/6
FL|W¿]ûpq| L\;<=±� R¡e�mef:L��a�;<=±�wT�TWq��_¯a�´�N |7ABC��HT��ÙI�9:�\W×Ø¡�Uf_`Z�wfW�/aW( _`LÀg�Õ�¿]ûpqT��ÒÓÔ5657Ó:��U¿]ûI.�g\�7 L 789:¿]û±�I�m:gmT¯�°¢T��C1ÒÓÔ C3WC5�( _`L9:\�DEHT~�\UV�
9¦�_TW�L 78p9:¿]ûpqTÍÎÒÓÔ��U7�9:¯�°¢Tqa�:L�TÐú� �IFGHT~�\UV�:�\79:L
4.1 ��rst23
À�DEFGH7Ó:Õ�¿]ûpqTÍÎHT~�I��9:LÕ�¿]ûpqT��Wëìí
î�ï7��2.5/aîUgõ0�fgÞ<T�H7ÓvV�äüUgLM127å5hTDEH7Ó
Liquefy Nonliquefy
Port Island0.6
0.4
0.2
0.0
Number of cycles6543210
0.6
0.4
0.2
0.0
Liquefy Nonliquefy
Tonankai
706050403020100Number of cycles
Liquefy Nonliquefy
Tomakomai0.6
0.4
0.2
0.0
Number of cycles403020100
600
400
200
0
5040302010
0
150
100
50
0
Liquefy Nonliquefy
Liquefy Nonliquefy
Liquefy Nonliquefy
(a) PI6 (b) ��26 (c) f�g6
'11( ��rst23u����h�q
�39�
Average Std. dev.
Port Island
Ground number
2.0
1.5
1.0
0.5
0.0250200150100500
Average Std. dev.
Tonankai
Ground number250200150100500
2.0
1.5
1.0
0.5
0.0
Average Std. dev.
2.0
1.5
1.0
0.5
0.0
Tomakomai
250200150100500Ground number
(a) ����|��|� 2.0
1.5
1.0
0.5
0.0
Port Island
Ground number250200150100500
Average Std. dev.
2.0
1.5
1.0
0.5
0.0
Ground number250200150100500
Tonankai Average Std. dev.
Average Std. dev.
Tomakomai
Ground number250200150100500
2.0
1.5
1.0
0.5
0.0
(b) }~{�|�
Average Std. dev.
Tomakomai2.0
1.5
1.0
0.5
0.0250200150100500
Ground number
2.0
1.5
1.0
0.5
0.0
Average Std. dev.
Tonankai
Ground number250200150100500
Average Std. dev.
Port Island
Ground number
3
2
1
0250200150100500
(c) yz{�|�
3
2
1
0
Ground number250200150100500
Average Std. dev.
Port Island Average Std. dev.
Tonankai
Ground number
4
3
2
1
0250200150100500
Tomakomai Average Std. dev.
Ground number
4
3
2
1
0250200150100500
(d) Orense�|�
'12( rst23u����]
�40�
�1( ��rst23����e�
ëìí 12e "�e Orense PI TNK TM PI TNK TM PI TNK TM PI TNK TM �¼ 0.986 0.997 1.039 1.095 0.928 0.840 1.242 0.860 0.607 1.364 1.522 1.316óô3� 0.071 0.105 0.104 0.086 0.102 0.100 0.232 0.195 0.134 0.238 0.393 0.5514ùPI¹PI6�TNK¹��26�TM¹f�g6
2.01.51.00.50
25
20
15
10
5
0
rd =————tmaxsvamax/G
SeedIwasaki
2.52.01.51.00.50
25
20
15
10
5
0
rd =————tmaxsvamax/G
SeedIwasaki
25
20
15
10
5
0 2.52.01.51.00.50rd =————
tmaxsvamax/G
SeedIwasaki
Port Island Tonankai Tomakomai
'13( rst23u/0?3176aG�O
:¿]ûpqT YUSAYUSA 7Ó:Õ�¿]ûpq789:|T�¼|\óô3�Iî9LÀg��T5hÐ\T�¼¿]ûpq|IÑ5h7<`V�¼Ug�TIþ 17óô3�\5¿Vî9L
4<T¿]ûpqT��HT���v\��¼�_~�ZÖ¡vgTW�M12(a)7îUgëìíî�ïa�PI 6��<T23456678UV�[¥1TNð7�´��¼|W0.986W1.039�óô3�W0.071W0.105\_´�Þ<T565\�7~�ZÖ`L�f78UV�12eT�H�"�eT�HaW PI678UVW�¼|Z��m�2345678UVW��mT��a�êe<����`LÀg�OrenseT�HW�`�fT56678UV�|W��`L _Ò��TxyTs67W4=ZÛ0¡�Uf_`L77H¦gÓÐ7��äçèaW�5þ��
�Z¦§\UV8ef�wT|W"Ñ�I�9UV��mT|Z�G�f:�\�©`\¬ef
:LU¡U�g\ê�5þT56no¡e;<=T½¾I�ÓÐ\9:A7W�5hT©ÊÏ�
_Ù«¡e�;<=5ha�Nð5ha;<=UV`_`\��Z�:\wT��a���Z��C
_vg´9:25)LÍÎT~�Iø::7W�_:¦Cì-�_��I.�_`çóT�Z;ÀU`\
`:26)Z�/aWw�ÀaT��Wu _`L DEHT~�W�5h�T¿]ûpqTÍÎ~�7�<�9:Lw�a�M137W¿]ûpqT³
VI�ëìíî�ïT rd7àüUVî9LM7W�Seed and Idriss27)7Ó: rdT��T���\ãae17)7Ó:JKÂZî�fV`:Z�äüTxyW�fÓ´��C3fV`:ijk�¢©C�:L�
Tª«\UVÊTÓÐ_�\Z¬ef:L À��|}Ug�<TaW SHAKE28)7Ó:Ñpq56prstId`VÒ´�sqUg56
5�/ad`g�T\|¦:\���W��`Ta�=U`§�Çû5Z¾�7CC�565Z
þJa�;9:\`ÐÙ«ZþfÅ9¡vg\`:L�f78UV�/asqUg565W�
�C�5ha=U`§�Çû5ZÈ�vg´�;<=Z½¾Ug´UV`:L\��a�;<=Z½
¾U_`\9fê�§�ÇZ=UC_:\�üJT¿]û±�78pUV5þT���7WøþZv
f22)�Õ����WwTJÓ´øaWÚG|\_´�rd=1\_:LÚ��;<=Z½¾9fê�¿]ûpqWEF.ç�.��ç#T��7Ó´��C���f�êe<��½¾9:�\ZÍÎ�f
:LÀg�Ê7H¦:�ñ7Ó´;<=JÓ´»aW rdZ��C_:Lstxy7W�feTxyZ
s´��vVÒ´�¬�7Ú<TÖ++>�a?@9:�\Za���wTgm�êe<����`
�41�
\¬ef:L Aá7�:gm7�M147B4�_XYTÕ�¿]ûpq\b�S�~�T³VIî9LÕ�¿]
ûpqTC7W56prstTxy\DEH7Ó:xyT��IîUVÒ´�MT»ÀgWP7EF
�TT�Z<�efV`:LMa�EF�1\EF�77WÍÎ~�TÓ¡vgXY�EF�43\EF�162W§¨7D¡vgXYa�:L~�TÓ¡vg�EF�77aW;<=Z½¾UV`_`LÚ��~�ZD¡vgEF�43\EF�162W;<=Z½¾UV`:L�feT!j"aW;<=JáEaWDEH\56prstTÚÒWÓ`Z�;<=JáÛaW56prstT�Z��C_vV`:L
�fZ�M137îUg rdZ§¨7��¡vg!j"Tª«a�:L;<=JáEZÓCÚÒ9:TW�
ÅW´øþ���a?@a�:L9_ ú�;<=Z½¾9:�\7Ó´wTJÓ´ø7F :¿]
ûpqZwTJT¿]û±�aÁý�f:|7Ó´Óþ�f:gm�5þT���¡e5»T³VI
´GUV`:DEHaW�;<=JÓ´øaW;<=UV`_`!j"\µ ToyZÈ�:LÚ��
;<=JáÛaWsqZ��C_:\¿]ûpq���C_:Z��ToyW5þ¡eprI´GU
PortIslandTonankaiTomakomai
DEH�nopq
Depth
(m)
SoilType
Vs
(m/s)
gt
(kN/m3)
Max. Excess PWP
100 200
Max. Stress(kPa)
20 40 60
(kPa)
19.1
19.1
20.1
20.6
19.1
17.1
18.1
18.1
18.117.119.1
190.5
145.4
141.2
225.8
166.4
127.0
217.2
172.4
220.7217.2294.7
0.8
2.43.03.8
5.5
7.8
9.2
12.813.2
15.0
16.8
18.118.919.520.5
Depth
(m)
SoilType
Vs
(m/s)
gt
(kN/m3)
Max. Stress(kPa)
50 100
Max. Excess PWP
100
(kPa)50 150
17.6
18.620.619.618.6
19.6
18.619.1
19.1
19.620.6
19.6
20.6
19.6
144.2
160.0233.9251.3220.7
230.8
209.7256.6
227.5
328.4352.7
298.6
371.3
364.6
0.5
2.12.8
3.64.04.44.75.8
7.17.7
9.810.811.6
12.8
14.815.2
Site 1
Site 77
Depth
(m)
SoilType
Vs
(m/s)
gt
(kN/m3)
Max. Stress(kPa)
20 40 60 80 100
Max. Excess PWP
100
181.6
271.3
19.6
18.6
0.5
2.0
9.9
12.1
13.7
15.5
17.9
(kPa)50 150
Depth
(m)
SoilType
Vs
(m/s)
gt
(kN/m3)
Max. Stress(kPa)
20 40 60 80
Max. Excess PWP
100
17.1
19.1
19.1
20.1
18.6
145.4
177.9
224.2
271.3
294.7
0.9
1.82.7
5.0
8.0
15.4
Site 43Site 162
PortIslandTonankaiTomakomai
DEH�nopq
'14( rst23�����
�42�
V`:DEHaW¬Áa�V`_`LM14TEF�1aW�<T2345678UVW;<=Z½¾UV`_`Ta�EF�77\µ��ña�Àg�PI 678UVW GL-19m�7TJa;<=UVÒ´��fÓ´øaW�TJ7Ó:sqTGÓZ�:Ta�DEHTÍÎ~�ZÓ¡vg\¬ef:L_
Ò�;<=T%�7W�EF.ç�.��ç#7Ó´¿]ûpqZ��C_:X��:Ta��T
_�Z¬�7W]HU_`!j"��:\¬ef:L �feT¬I¡e�;<=JÓ´øTJa5þTpr¡e;<=8¥JT¿]ûpqIÍÎ9:%
�7W�M137�ef:[^TJ�W_C�Ó´~�ZÖ`�T\¬ef:L Àg�M13aWijkWêe<`V`:\W`��K�W¡_´élUV`:Lw�a�Õ�LMH7Ó´Â(7)T0.01578p9:¢|I�m:\�PI 6���26�f�g6Twf�f78UV�0.0099�0.0158�0.0091\_vgLÊ7��T��mT|0.01Id`�ëìíî�ï7AB�þ1\µ� 7pq|T�¼|\óô3�I�m:\�Þ<T56678UVwf�f�é1.031�0.068ù�é1.043�0.113ù�é1.090�0.112ùT�q� ¿\_vgL�TxyWþ1\|}UVÓC_vV`: �aW_`L�fW�þ1aWÚN5hÐ\7�¼|I�m�wfI5hÑ£a�¼UgT78U�M13Ó´äü9:A7WÑVTijk¡eÕ�LMHaäüUgTa��TäüHT�Z��UV`:\¬ef:Lþ1T _O��HaW���Wwf[^��_�`aW_`�\¡e�0.015W�:��W��_|\`ÓÐL _Ò��feTÞ<Tõ0HW�5þTÕ����Tq7ABCëìíî�ïTÍÎPHZ��_
¿]ûpqI8�;<=U_`5hI;<=9:\FGUVUÀÐ×ØÙI�L9:gm7JK�
fV`:�Ta�:�\¡e�/��Txy~�ZD¡vg\`Ð�\ZFGH\UVJ�Z©`\
`ÐxI�Ñ7QC�\Wa�_`�\IçôUVÒCL
4.2 ���������] M1574<TDEFGHTxyInopqstTxy\|}UVî9L��a�PQWDEH7Ó
: FLa1á»Z;<=a�:LÚ���QWnopqst7Ó:b�S�~�|a�fZ0.97a�fê;<=a�:L_Ò�b�S�|W;<=7��9:0.97T»72UijkZ_`�³Z�:Z��fW�YUSAYUSA aW�7H¦gÓÐ7��7b�S�~�Z½¾U��Ñ;<=7ï:gm��T�7TpraÍÀ:�\Z�À´B`gma�:L 9¦VTxyZ FL�1\b�S�~�|=0.97éMTRù�ÀgW FL>1\b�S�~�|<0.97éMTSùa�fêDEFGH\nopqstTxyW�Ñ7ÚÒUg\`Ð�\Za�:LU¡U�no
pqstTq;<=\FGUgXYéMTTù�DEFGHTqZ;<=\FGUgXYéMTUù
���U�DEFGHZ�ÑaW_`�\Z ¡:L w�a�DEHT~�I��9:gm7�ÊTÞ<T¯IG�9:L !�s@¹nopqst\DEHTFGZÚÒ9:éR\Sù¿� !��@¹DEHa;<=U_`Z�nopqsta;<=9:éTù¿� !b�@¹DEHa;<=9:Z�nopqsta;<=U_`éUù¿�
��@ZÝ`TZÓ`FGH\`Ð�\7_:Z�b�@ZÖ`\;<=U_`T79:\FGUg
�\7_´å�Va�:L�feIäüUVþ27î9L PI 678UVWëìíî�ïZÚT~�ZÓC��s@é��TFGZµ�ù83.6%���@1.4%�
b�@15.0%a�:L56prstTA�»JZ77;<=9:\ø�WT¿]ûpqTFXZ��C_:gm�5þT���¡eÎ�T¿]ûpqI´G9:\b���\_:\`Ð�DEFGHa
WÍÎZ&'\¬ef:XYZ�:�\�Àg��äçè_^aW"Ñ�TýÁ�Û0a�:�\
òI¬fê���_xy\�:�\�a�:LÚ��2345678UVW~�ZDC_´���
@Z��2678UVW46.8%�f�g678UVW11.6%\_:L wTýT�Ha��T _÷ÜWµ�a�º»456éPI 6ù789:ÍÎ~�7|¦�234T
�43�
ÍÎ~�WD`L9_ ú�Ñ£\UVz{TDEFGHWº»45678UVW�:��ÉdÙZ
�:\`:Z�2345678UVWÉdÙZÝ`L
FL value
1.0
0.5
0.0
FL value
1.0
0.5
0.0
Port Island
543210FL value
1.0
0.5
0.0
Tonankai
86420
Tomakomai
86420
YUSAYUSAL N
LN
YUSAYUSAL N
LN
YUSAYUSAL N
LN
(a) ����|��|�
FL value
1.0
0.5
0.0
FL value
1.0
0.5
0.0
FL value
1.0
0.5
0.0
Tomakomai
543210
Tonankai
86420
Port Island
543210
YUSAYUSAL N
LN
YUSAYUSAL N
LN
YUSAYUSAL N
LN
(b) }~{�|�
FL value
1.0
0.5
0.0
FL value
1.0
0.5
0.0
FL value
1.0
0.5
0.0
Port Island
543210
Tonankai
86420
Tomakomai
86420
YUSAYUSAL N
LN
YUSAYUSAL N
LN
YUSAYUSAL N
LN
(c) yz{�|�
FL value
1.0
0.5
0.0
FL value
1.0
0.5
0.0
FL value
1.0
0.5
0.0
Tomakomai
86420
Tonankai
86420
Port Island
543210
YUSAYUSAL N
LN
YUSAYUSAL N
LN
YUSAYUSAL N
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8) %&#$-�}%~½#$�mkjé1996ù¹hij��567Ò�:;<=!§;<=XY7AB`g;<=FGHT��Ù7�9:CD��ï
9) http://www.k-net.bosai.go.jp/k-net/quake/ 10) ;<=Ö++>�!ÍÎH\�äH7�9:¸mk�,�½þl�5h����1999�pp. 23-
24 11) 5h���é2000ù¹%«±²T�H\s?��Ú®õf���902pp. 12) 5hT5�st�Að�¡epdÀa��5h��!Að�¸çj>2�5h����2007�
152pp. 13) Hatanaka, M. and Uchida, A. (1996): Empirical correlation between penetration resistance and internal friction
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18) 5h���é1999ù¹;<=\8`�5h���m¸��.�5céL�,¼!��òó\8`ù 19) "����m�Ú������ m�@é1993ù¹SI|Id`g;<=ÍÎPH��28®%«��#$½þ��pp. 1325-1328
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Simplified procedure for evaluating liquefaction potential under ocean trench type long period earthquake
YOSHIDA Nozomu1)�OHYA Yousuke2), SAWADA Sumio3)�NAKAMURA Susumu4)
1) Member, Professor, Tohoku Gakuin University, Dr. Eng. 2) Member, Post graduate student, Tohoku Gakuin University
3) Member, Professor, Kyoto University, Dr. Eng. 4) Member, Professor, Nihon University, Dr. Eng.
ABSTRACT A simplified method for evaluating liquefaction potential under ocean trench type long period earthquakes. Since there is no experience on damage or liquefaction under this type of earthquake, effective stress analyses are made on more than 200 sites that are used in the past investigation on liquefaction damage. Accuracy or effectiveness of existing simplified methods is investigated, and is found that they are applicable to near field earthquake, but they result in dangerous evaluation under ocean trench type earthquakes such as artificial earthquake for coming Tonankai earthquake and recorded accelerogram during the Tokachi-oki earthquake of 2003. The reason is found to be effective number of loading cycles; it is about 10 times larger than that considered in the existing simplified procedure. Then a correction factor for liquefaction strength is proposed in order to evaluate liquefaction potential under this type of earthquakes. The factor is a half of the factor in the existing method; liquefaction strength is to be half of the conventional value when comparing maximum shear stress to evaluate FL value. This method works so that dangerous ratio (ratio of number of layers where onset of liquefaction is identified under effective stress analysis but is not identified under existing simplified procedure to the total number of layers) becomes small to be the same order under near field earthquake.
Key Words: Liquefaction, Simplified procedure, effective cycles, ocean trench type earthquake, near field earthquake