Checked against official Japan Meteorological Agency (JMA) pages on September 23, 2026. JMA reviews the descriptions behind each level roughly every five years, so treat the specific wording as current as of this writing.

Japan has frequent earthquakes, and the overwhelming majority of them are ones nobody notices outside a seismometer. If you feel one during your trip, the number you’ll hear announced on TV or see on your phone almost never matches the “magnitude” scale you may know from home. That’s not a translation issue — Japan genuinely uses a different scale for the number that matters to you personally, and it’s worth understanding before you’re standing in a hotel room wondering whether to worry.

Magnitude Measures the Earthquake. Shindo Measures What You Feel

The Richter-style “magnitude” figure describes the total energy an earthquake released at its source — one number for the whole event, same everywhere. JMA’s shindo (震度) scale is different: it measures the actual intensity of shaking at a specific location, recorded by seismometers placed at ground level or on the first floor of low-rise buildings. That means a single earthquake produces one magnitude but many different shindo readings — an area near the epicenter might register a strong shindo 6, while a city 200 km away feels only a shindo 2, from the exact same quake.

The Scale Runs 0 to 7, With Two Levels Split in Half

JMA’s scale has 10 steps in total: 0, 1, 2, 3, 4, 5-lower, 5-upper, 6-lower, 6-upper, and 7. According to JMA’s official reference table, here’s roughly what each step feels like to a person indoors:

• 0–1: Not felt, or felt faintly only by people sitting still indoors.
• 2–3: Most people indoors notice it; some sleepers wake up; dishes may rattle.
• 4: Most people are startled; hanging lamps swing noticeably; unsteady objects may topple.
• 5-lower: Most people feel frightened and want to grab something to steady themselves; unsecured furniture can start to move.
• 5-upper: Hard to move around without holding onto something; unsecured furniture can fall over.
• 6-lower: Standing becomes difficult.
• 6-upper: Impossible to stand without crawling; you may be thrown off your feet.
• 7: Unsecured furniture can be thrown into the air; this is the top of the scale — JMA does not issue anything higher.

Levels 5 and 6 are the ones you’ll most often see reported after a real, felt earthquake in a populated area, and the lower/upper split exists precisely because the practical difference between them — can you still walk versus can you not — matters more than a single averaged number would show.

This Number Isn’t Just Descriptive — It Automatically Triggers Real Responses

The reason the shindo figure matters for your trip is that Japanese infrastructure is wired to react to specific shindo thresholds, not to magnitude or to a human decision made in the moment. JMA’s own explanatory table lists the standard triggers:

• Shindo 4 or higher: Railways and expressway operators begin safety checks, which can mean suspended service or speed restrictions “at each operator’s discretion” — the exact threshold varies by line and by section, based on each railway’s own seismometers along the track, not just the one number announced on the news.
• Shindo 5-lower or higher: Gas utilities’ safety devices (microcomputer meters) can automatically cut off supply to a building; elevators with seismic sensors automatically stop and won’t resume until a safety check is done, which can take time; water and power outages become possible in the affected area.
• Shindo 6-lower or higher: Phone and internet networks in and around the affected area can become congested with people checking on each other, and carriers activate disaster message services.

In practice, this is why a train can sit stopped in a station for an hour or more after a quake you barely felt as a passenger — the suspension isn’t a sign something worse is happening, it’s the standard, automatic safety procedure, and staff need time to physically inspect the track before resuming.

The Phone Alert Might Give You Only Seconds

Japan’s Earthquake Early Warning (EEW) system — the loud alarm tone that can come through your phone, TV, and public speakers — works by detecting the faster, weaker “P-wave” at seismometers near the epicenter and racing to warn areas before the slower, stronger “S-wave” (the part you actually feel) arrives. JMA’s own page on the system’s limitations is direct about what that means in practice: the time between the warning and strong shaking is typically only a few seconds, and at most a few tens of seconds — and near the epicenter itself, the warning can arrive too late to be useful at all, because detecting and processing the signal takes a few seconds on its own. JMA also cautions that the predicted intensity can be off by about one shindo level in either direction, since it’s calculated from a very short burst of initial data.

JMA issues an EEW warning when it predicts a shindo of 5-lower or higher for an area. If you hear the alert tone, there usually isn’t time to relocate — the practical move is to protect yourself where you are (get low, stay away from windows and things that can fall) rather than try to run anywhere.

Most Trips Never Go Past a Shindo 1 or 2

Most travelers will go their whole trip without feeling anything above a shindo 1 or 2, and even that is more curiosity than concern. The useful habits are simple: know that a stopped train after a quake is routine, not an emergency signal on its own; know that an elevator stopping mid-trip after shaking is an automatic safety feature, not a malfunction — use the intercom button inside the cab to call for help rather than forcing the doors; and know that the alarm tone, if you ever hear it, means act immediately rather than check your phone for details first.

How Travel AI Rescue Helps

Travel AI Rescue keeps Japan’s emergency numbers — 110 for police, 119 for fire and ambulance — one tap away with the country code already attached, which matters most in the confusion right after a quake when a phone network may be congested. It can display Japanese-language cards describing your situation in plain terms, so you can be understood immediately even if you don’t speak Japanese. And above all, the AI drafts a clear summary of your situation and location as you describe it — useful if you need to explain where you are to station staff or emergency services. Your passport and travel insurance details stay stored and readable on the device even with zero signal, and there’s offline diagnosis for when the eSIM itself won’t connect. It works differently from a staffed help desk or a travel insurance policy, and it’s with you around the clock — a bridge that gets you to the right emergency channel quickly and in the right words. (Evacuation orders and infrastructure safety decisions are made by Japan’s transit operators, utilities, and local authorities, not by this app.)

Sources

• Japan Meteorological Agency, “気象庁震度階級関連解説表” (JMA Seismic Intensity Scale Reference Table). https://www.jma.go.jp/jma/kishou/know/shindo/kaisetsu.html (accessed 2026-09-23).
• Japan Meteorological Agency, “緊急地震速報の特性や限界、利用上の注意” (Characteristics, Limitations, and Cautions for Earthquake Early Warning). https://www.jma.go.jp/jma/kishou/know/jishin/eew/shikumi/tokusei.html (accessed 2026-09-23).