Earthquakes, Typhoons & Volcanic Activity in Japan: What Travellers Need to Know

Japan sits at the convergence of four tectonic plates and lies directly in the Pacific typhoon belt. For most visitors, none of this creates any real danger — the country has spent decades building some of the world’s most sophisticated disaster infrastructure. But being aware of what’s possible, and knowing what to do, makes the difference between a minor disruption and a genuine emergency.

Earthquakes

Japan experiences around 1,500 earthquakes every year that are strong enough to be felt, and thousands more that only instruments detect. Most are small. Major destructive earthquakes — the kind that make international news — occur once or twice a decade, though the seismic background noise is constant.

The JMA Intensity Scale

Japan uses its own seismic intensity scale set by the Japan Meteorological Agency (JMA), separate from the Richter magnitude scale. The JMA scale runs from 0 to 7 and measures how strongly shaking is felt at a specific location:

• 0–1: Not felt, or barely perceptible
• 2–3: Felt indoors, hanging objects swing
• 4: Most people notice, some wake from sleep
• 5 Lower / 5 Upper: Difficult to stand, unsecured furniture moves
• 6 Lower / 6 Upper: Impossible to stand without support, some buildings damaged
• 7: Maximum intensity — severe structural damage possible

When an earthquake occurs, Japanese TV and smartphone alerts immediately broadcast the JMA intensity reading for each region. If you feel shaking, the intensity number tells you whether to shelter in place or evacuate.

What to Do During an Earthquake

Japan’s buildings are built to strict seismic codes — modern structures are designed to flex, not collapse. The guidance from Japanese authorities:

1. Drop, cover, hold on. Get under a sturdy table or desk and protect your head and neck. If no table is nearby, kneel against an interior wall away from windows.
2. Stay inside until shaking stops. Running outside during shaking is dangerous — falling glass, tiles, and exterior fixtures cause most injuries.
3. After shaking stops: Check for fire, open a door to prevent the frame warping shut, and move to an open area away from damaged structures.
4. Expect aftershocks. Major earthquakes are almost always followed by aftershocks over the following hours and days.

In hotels, the emergency exits and assembly points are usually marked near the room door. Find them when you check in.

Earthquake Early Warning Apps

Japan’s early warning system can detect a large earthquake and send alerts to mobile phones several seconds before shaking arrives — enough time to take cover. Download at least one of these before you travel:

• Safety Tips (by RCSC): The official app for foreign visitors, published by the Japan Tourism Agency and Red Cross Society of China. Provides earthquake, tsunami, typhoon, and volcano alerts in English, Chinese, and Korean. Available on iOS and Android.
• Yurekuru Call: A popular Japanese earthquake alert app with English support. Known for fast alerts and customisable intensity thresholds.
• Yahoo! Japan Disaster (災害情報): Comprehensive disaster app from Yahoo Japan, used widely by residents. The interface is primarily Japanese, but alerts are fast and cover all hazard types.

All three use Japan’s J-Alert system, which broadcasts warnings via cell broadcast — alerts appear on compatible phones even without an internet connection.

Typhoon Season

Typhoons (the Pacific equivalent of hurricanes) affect Japan from roughly June through October, with the peak season running August through September. Japan averages around 11 typhoons making landfall or passing close enough to cause disruption per year.

Which Regions Are Most Affected

Okinawa and the Ryukyu Islands receive more direct typhoon hits than anywhere else in Japan — it’s simply their geography. Kyushu (Fukuoka, Nagasaki, Kagoshima) is the next most exposed region on the main islands. The Pacific coast of Honshu — including the Kii Peninsula and coastal Shizuoka — sees more typhoon rainfall than the Sea of Japan coast. Tokyo and central Japan are affected by some typhoons, though the mountains weaken many systems before they arrive.

For a month-by-month breakdown of weather risk, see our guides to Japan in August, Japan in September, and Japan in October.

Flight and Shinkansen Disruption

Typhoons regularly ground flights and halt shinkansen services for 12–48 hours. Airlines cancel flights pre-emptively when winds exceed safe operating thresholds — typically around 40–50 knots at the airport. JR announces shinkansen suspensions 24–48 hours in advance when a typhoon track is confirmed.

If a typhoon is approaching during your trip:

• Check your airline’s app for rebooking waivers — most Japanese carriers offer free date changes when a typhoon warning is active.
• JR’s shinkansen suspension notices appear on its English website and app.
• Stay in your accommodation rather than travelling — Japan’s infrastructure handles typhoons well when stationary, but being in transit during landfall is miserable and potentially dangerous.

During a Typhoon

Hotels and local authorities manage typhoon safety effectively. If a typhoon warning is issued for your area:

• Stay indoors. Modern Japanese hotels are well-built and safe.
• Avoid rivers, coastlines, and low-lying areas — storm surge and flash flooding are the primary risks.
• Stock water and snacks for 24–48 hours in case you can’t leave.
• J-Alert and the Safety Tips app will push emergency alerts if evacuation orders are issued for your location.

Volcanic Activity

Japan has 111 active volcanoes — more than any country in Europe — but the vast majority operate at background activity levels that pose no risk to visitors. A handful require attention.

Sakurajima (Kagoshima)

Sakurajima is one of the world’s most continuously active volcanoes, erupting hundreds of times per year in small explosions. The city of Kagoshima, directly across the bay, operates normally alongside it. Ash falls on Kagoshima regularly — residents carry umbrellas for ash as much as rain. Visitors can get close to Sakurajima, and it’s a popular day trip, but check the current alert level before approaching the crater.

Mount Aso (Kumamoto, Kyushu)

Mount Aso contains one of the world’s largest calderas and has an active lava lake at its summit. The crater rim is a major tourist attraction when open, but access is restricted during periods of elevated activity. Check the JMA volcanic alert level before visiting — the Aso Volcanic Museum website posts current access conditions.

Hakone

Hakone, two hours from Tokyo, is one of Japan’s most popular onsen resort areas and sits inside a volcanic caldera. Owakudani — the sulphurous hot-spring valley famous for black eggs — is occasionally closed when hydrogen sulphide levels rise. Hakone itself remains open during these closures; only the immediate Owakudani area is restricted. The Hakone Ropeway has an alternative route when the Owakudani station is closed.

Volcanic Alert Levels

JMA uses a five-level volcanic alert system:

• Level 1: Active — volcanic activity, no restrictions for general visitors
• Level 2: Do not approach the crater
• Level 3: Do not approach the volcano (wider exclusion zone)
• Level 4: Prepare to evacuate nearby communities
• Level 5: Evacuate

Check JMA’s English volcanic activity page (jma.go.jp) for the current status of any volcano you plan to visit. The Safety Tips app also covers volcanic alerts.

Tsunami Awareness

Japan’s coastline is covered with tsunami warning signs, vertical evacuation routes (marked with a wave symbol on blue signs), and concrete shelter platforms in coastal towns. The infrastructure exists precisely because of Japan’s history — including the 2011 Tōhoku tsunami.

For visitors, the key points:

• Never ignore a tsunami warning. If you feel a large earthquake near the coast, don’t wait for an official alert — move inland or uphill immediately.
• Follow the blue evacuation signs. Every coastal town in Japan has marked evacuation routes pointing toward high ground.
• The J-Alert system is fast. Japan’s seismic monitoring network can issue tsunami warnings within 3 minutes of a major offshore earthquake. The Safety Tips app will alert you.
• Tsunami height bears no relation to waves. A 1-metre tsunami at the coast can travel inland with enough force to sweep away cars. Take all warnings seriously.

After an earthquake near the coast, wait for official all-clear before returning to low-lying areas — even if initial waves seem small.

Travel Insurance

Standard travel insurance covers trip cancellation due to typhoons and some natural disaster disruption. But Japan’s specific risks make a few extra things worth checking before you buy:

• Medical evacuation: If a major earthquake affects a city you’re in, repatriation may be complex. Ensure your policy covers emergency medical evacuation internationally.
• Volcanic ash flight cancellations: Not all policies treat volcanic ash closures the same way — some classify it as a natural disaster (covered), others as an “extraordinary event” (not covered). Read the small print.
• Activity cover: If you’re hiking on or near active volcanoes or skiing in avalanche terrain, standard policies may exclude these unless you add adventure sports cover.

We recommend purchasing travel insurance that includes medical evacuation, trip cancellation for natural disasters, and adequate medical coverage of at least €500,000 — Japanese hospital costs for foreign visitors are substantial without insurance. See our full guide to travel insurance for Japan for what to look for in a policy.

Emergency Contacts

Save these before you travel:

Service	Number	Notes
Police	110	Speak slowly in English — some operators have limited English
Fire / Ambulance	119	For fire or medical emergency
Disaster Message Dial	171	Leave or check safety messages after a major disaster
TELL Lifeline (English)	03-5774-0992	English-language crisis support, Tokyo-based

The Disaster Message Dial (171) is activated after large earthquakes and allows people to record a 30-second voice message so family members can check in. It’s widely used by Japanese residents and works even when regular calls are failing due to network congestion.

Japan’s disaster infrastructure is genuinely world-class. The combination of earthquake-resistant construction, a sophisticated early warning system, and a population that drills regularly means most visitors pass through Japan without experiencing anything more alarming than a minor tremor. Being prepared costs you nothing beyond a few app downloads and knowing which number to call.

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