Map the risk of liquefaction, read from aerial photography

If the old and new map, you look at the aerial photograph
Past of the land you understand

As for the meeting place full the seat, depending upon time standing, the way of prosperity of the extent where the person whom you hear is present.Several report panel and the like of the latest earthquake disaster relationship was displayed also

When 2011 June 23rd, you want to hear by any means in the national geographical institute east Japanese large earthquake disaster investigation briefing at one bridge commemoration auditorium of Chiyoda Ku, one of announcements “circumstance of the liquefied conversion which is seen from the old map photograph” (national geographical institute geographical information analytical laboratory leader Koarai Mamoru).The map is something which displays the present condition of that land, but if past, the present time is compared by sight, the change understands.Liquefied conversion the river and the sea, with the lakes and marshes nearby depression and landfill area and the old river channel etc ground-water level happens at the place where it is shallower than 10m.If, ground-water level you do not understand from the map doing, compares by sight the old and new map, being the depression of course presently, it is the expectation which the old river channel which becomes residential quarter and the land etc which is reclaimed understands.

As for being listed in announcement as is useful because of that
1. Old edition map
As in name, past map.You understand with 1/50000 and 1/25000, on the net there is the figure of somewhere, but other than up-to-date ones main institute of national geographical institute, you peruse in the local measurement section, or attested copy delivery it is made to do you are necessary.

2. Past aerial photograph
and are summarized as an archive of land, infrastructure and transition in the gsi website, can be viewed on the net. 1936army after the year, including photos of the u.s. military as well as, aerial view of the present day are summarized. useful to compare the old and new.

3. figure land condition

figure home land condition. because they are color-coded, easy to understand

terrain classification for areas such as disaster prevention measures and the main propulsion plains of major cities, in the map showing the height of the land, such as, some e-land (like about the countryintegrated on the basis of position information and geographic information, was reproduced on the computer. given the complex easy to understand and map information of various) but can be viewed.

4. geomorphological flood control
managed by the country of the river basin, subject to the plains cities to concentrate, landform classification, map river have been incorporated, such as workpiece. in the kanto area kuji, nakagawa, kasumigaura, kokaigawa, kinugawa, watarase, karasugawa, kan’nagawa, tonegawa, edogawa, nakagawa, arakawa, tamagawa, tsurumi, sagami river, fujikawa has been developed. can be viewed on the net.

5. topographic rapid
map than in the original drawing was made in the meiji era, past articles where is the safe high ground? to know the height of land from the map of the meiji era that was introduced in browsing system for agro-environmental historic efficient to see it (had also recommended personnel and gsi) i. can be viewed on the net.

it was concentrated damage
the old river channel landfill, waterways such as the yuan

the liquefaction, bay area in chiba prefecture from underground sand was fukiage. some, such as the location was able to crack, long life line stop

in our presentation, the location liquefaction damage is concentrated in the downstream region, such as the tone river and tokyo bay was enormous damage in the earthquake liquefaction east, has been reported that the yuan was a waterway or river where the old landfill, presentations are made to be seen in the current net.

well, such as the weekly magazine here is dangerous! it has been pointed out include the name, such as municipalities and, a look at the map actually, is not necessarily mean that the entire dangerous, complex and safety risk, you can see that point in doubt is mixed and.

also, although it is not this announcement, there are also cases where they are safe and hazard maps of municipalities in the liquefaction. other geographic information map every possible look, also check the local and……. i think really in order to get a safety in urban areas is difficult to understand the original appearance of the ground and he is required know-how.

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