• Chunichi Shimbun


Officials in Nagoya are distributing seismic and tsunami hazard maps based on the damage the city is projected to take from an earthquake in the Nankai Trough.

The maps, which were distributed starting March 17, outline two scenarios.

One is based on the largest earthquake ever to hit Japan, while the other considers all possible scenarios that could occur when a big earthquake hits, covering such topics as damage from liquefaction and the highest rise in water levels.

Both maps are in A1 paper size and can be folded into the smaller A4 size for easier storage.

The seismic maps are to be distributed to all households in the city, while the tsunami maps will be given out to around 300,000 households in the seven wards likely to be affected by tsunami-related flooding.

The top half of each map shows the whole area while the bottom half details the damage projected according to the two scenarios.

There are 16 different versions of the seismic map, one based on each ward in the city. Each includes details about the location of evacuation shelters, wells and emergency water facilities.

Each version divides each ward into 50-sq.-meter blocks and color codes the estimated magnitude and liquefaction risks in each section.

The back of the seismic map gives instructions on how to use it as well as useful information related to disaster preparedness.

The tsunami map comes in three different versions.

The first one covers Nakamura Ward, Atsuta Ward and Nakagawa Ward, while the second one covers Mizuho Ward, Minami Ward and Midori Ward. The third one will be distributed to households in Minato Ward only.

Each shows the name of the buildings to evacuate to and where they are. Each ward is divided into 5-meter blocks, with indications for the highest water level projected and the time it will take to hit 30 cm.

Unlike typical tsunami, which push inland in waves, if an earthquake rips through the Nankai Trough area around Nagoya the entire sea level is likely to rise.

The maps explain such information on the back and list the estimated time it will take for tsunami to reach different parts of the shoreline.

To raise public awareness, the city also plans to distribute custtomizable stickers listing water height estimates so residents can display the information at home.

“We have left many blank spaces on the maps for residents to write the location of their homes, evacuation routes, areas to avoid and so on,” said a staff member working in the city’s disaster preparedness department.

“We hope the hazard map will come in handy in the event of a disaster,” he added.

This section, appearing Saturdays, features topics and issues from the Chubu region covered by the Chunichi Shimbun. The original article was published on March 18.

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