
People around Japan are spreading news of the J-Alert System and the manual that explains what to do in the event of an armed attack.
In a country that’s constantly faced with the threat of natural disasters like earthquakes, tsunami, and typhoons, Japan knows the importance of being prepared.
It was only two years ago when the Tokyo Metroplitan Government sent out disaster preparedness manuals to its residents to inform them about what to do in the event of a disaster, with tips on how to prepare survival kits, advice about first-aid, and instructions on how to create things like emergency toilets and stoves using only minimal materials.
With the most advanced earthquake early-warning system in the world, residents can be notified of an impending tremor or tidal wave in advance, giving them time to evacuate and implement the safety plans set out in these types of manuals.
But what happens if the impending threat is not from the natural world but from an outside nation instead? That’s where the government’s J-Alert system steps in. Initially introduced in 2007, the J-Alert is designed to transmit information from the government to residents via email, outdoor speakers and administrative municipalities in the event of an incident.
In the past, the J-Alert system has been used when North Korea launched its ballistic missiles, providing information about the launches and their trajectories via email to those registered to receive the J-Alert via one of the country’s many disaster prevention information apps. However, in the event of a much more imminent threat to Japanese soil, a “national protection siren” will sound as part of more drastic measures to safeguard residents in an armed attack situation.
You can hear the sound of the siren below:
The Cabinet Secretariat Civil Protection Portal Site, which helps to run the J-Alert System, has put together a wide range of informative diagrams and manuals – in Japanese and English – outlining the steps that should be taken by residents in the event of an armed attack.
▼ Characteristics of “Armed Attack Situations” are pictured below.
One of the most insightful documents that can be found on the portal site is a manual called “Protecting Ourselves Against Armed Attacks and Terrorism“. According to the document, when an area under threat has been identified, the siren will sound from loudspeakers in that region and warnings will be broadcast over the speakers and on television and radio to alert residents.
Whether indoors or outdoors, certain procedures should be followed, with residents asked to remain calm at all times.
Evacuation procedures will vary depending on the type of armed attack taking place.
The manual goes on to provide information on what to do in the event of chemical warfare and nuclear explosions, along with first aid instructions and advice on what to take with you to an emergency shelter. Though it’s an unsettling read, the topics covered in the manual are all part of Japan’s Civil Protection Law, which is designed to protect the “lives, bodies, and property of the people from armed attack against Japan from the outside”.
With heightened tensions in the region at the moment, the J-Alert System is being widely discussed online and in local media. Many are taking the government’s advice to further increase their understanding about what to do if an armed attack against Japan should occur as “preparations for such a situation should be fully discussed in peacetime”.
To find out more about Japan’s Civil Protection Law and the systems in place to help safeguard residents, visit the Cabinet Secretariat Civil Protection Portal Site for more details.
Source: Net Lab
Featured Image: Cabinet Secretariat Civil Protection Portal Site
Insert images: Cabinet Secretariat Civil Protection Portal Site (1, 2)








North Korea launches missiles over Japan, activating J-Alert warning system
North Korea missile alert manga produced by Japanese government office
North Korea fires new missile over Japan, residents woken by government warning systems
Many Japanese workers told by workplaces during missile scare: “Please come to work as usual”
Japanese onsen egg maker from 100-yen store Daiso needs to be on your shopping list
Cherry blossoms begin blooming in Japan with record-early starts for sakura season
The next time you’re feeling stressed out, you could relax on a Pokémon Psyduck chair from Japan
We asked our Japanese team of writers how they deal with seasonal allergies in Japan
Universal Studios’ Sailor Moon theme park attraction is finally coming to America
Are Japanese convenience store sandwiches scamming us with their fillings?
Studio Ghibli releases giant Totoro plushies in Japan
Japan’s budget chain restaurant Saizeriya might just be the perfect first date location
Godzilla-shaped ice cream on sale in Tokyo near the sight his most adorable rampage
Five things that keep Japanese people chained to their jobs
Train station platform ramen store closes its doors on half a century of history in Tokyo
Studio Ghibli releases Catbus pullback keychain that runs like the anime character
Studio Ghibli adds new Mother’s Day gift sets to its anime collection in Japan
Virtual idol Hatsune Miku redesigned with look that adds new elements and brings back old ones
Komachi Shokudo: Japanese mum’s-style cooking for breakfast, lunch and dinner in Tokyo
Starbucks Japan opens new cafe and art gallery in top Tokyo tourist neighbourhood
Starbucks Japan releases new My Fruit³ Frappuccino at only 34 stores around the country
The top 10 graduation songs in Japan as chosen by current Japanese high school students
7-Eleven Japan’s giant fried chicken skewer would be too big to eat, so it’s really for cuddling
Starbucks Japan unveils new sakura cherry blossom collection for hanami season 2026
The 10 most annoying things foreign tourists do on Japanese trains, according to locals
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Nine great places to see spring flowers in Japan, as chosen by travelers (with almost no sakura)
Naruto and Converse team up for new line of shinobi sneakers[Photos]
Starbucks Japan releases first-ever Hinamatsuri Girls’ Day Frappuccino
Japan’s cherry blossom season predicted to start earlier than we’d thought, especially in Tokyo
Starbucks Japan releases a new Cream Puff Frappuccino for a limited time
Survey asks foreign tourists what bothered them in Japan, more than half gave same answer
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Starbucks Japan releases new drinkware and goods for Valentine’s Day
We deeply regret going into this tunnel on our walk in the mountains of Japan
Studio Ghibli releases Kodama forest spirits from Princess Mononoke to light up your home
Japan’s newest Shinkansen has no seats…or passengers [Video]
Major Japanese hotel chain says reservations via overseas booking sites may not be valid
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
No more using real katana for tourism activities, Japan’s National Police Agency says