ar:
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es.
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ich
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700
H> 6.5
<= 6.5
Z <= 3.0
z u< 1.5
3
Ga
e
>
o
£8
E
E]
z
NAG HYG SAN KAS ROK UZK ASY
AREA
Figure 2. Width member of the street
350
EJONE
ENT
ENST
Nunmber of LINK
nN
o
o
NAG HYG SAN KAS ROK UZK ASY
AREA
Figure 3. Blockade situation of street by falling poles
(Width 3-6.5m)
Number of LINK
NAG HYG SAN KAS ROK UZK ASY
Figure 4. Blockade situation of street by falling poles
(Width 6.5m-)
NAG:Nagata, HYG:Hyougo, SAN:Sannomiya, KAS:Kasugano-
michi, ROK:Rokkoumichi, UZK:Uozaki, ASY:Ashiya
3. 2. Implementation and evaluation of the analysis
Here, we examine Rokkoumichi area where the damage
was large in comparison with Kasuganomichi area where
the damage was relatively small.
3.2.1.Condition of the network before the earthquake
disaster: An analysis results are shown in the Figure 8-1. -
and the Figure 9-1., respectively. Both of the areas show a
pattern that main street with large width is chosen up to
the vicinity of destination and then the path with small
Width is selected near at the destination. As a result, the
street with large width has a high frequency of choice.
381
DONE
WNT
ENST
Nunmber of LINK
NAG HYG SAN KAS ROK UZK ASY
Figure 5. Blockade situation of street by debris
(Width 3-6.5m)
250
OsAFE
DONE
ENT
ENST
N
eo
o
-
en
o
Number of LINK
e
[-]
NAG HYG SAN KAS ROK UZK ASY
Figure 6. Blockade situation of street by debris
(Width 6.5m-)
WBAFT-NT
EPRE-NT
ENST
Number of LINK
NAG HYG sAN KAS ROK UZK ASY
Figure 7. Passage situation of street
NST:No Blockade, NT:Passage impossible, ONE:1 Vehicle
passage, SAFE: 2 Vehicle passage, PRE-NT:Passage impossible
before earthquake, AFT-NT:Passage impossible after earthquake
There is not a difference in the tendency by the areas
especially.
3. 2. 2. Condition of the network after the earthquake
disaster
(1) Condition of the network: An analysis result in each
area is shown in the Figure 8-2. and the Figure 9-2.,
respectively. Unless the blockade takes place, no big
difference was observed from the normal pattern. On the
other hand, there are some links where an isolated node is
created by blockage and frequency of selection becomes
lower because it is eliminated from the objects of selection.
Especially, the big damage Rokkoumichi area has this
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B4. Vienna 1996
