Isolínea

Did it shake?

  • Was it close?
  • Was it strong?
  • Will there be more?

Isolínea answers those questions for your spot on the map as soon as USGS, EMSC and GEOFON publish the earthquake, and alerts you when one matters for your area.

Open Isolínea Free, no ads, no account needed. In your browser today; Android, iPhone and desktop very soon.

Illustrative isoseismals around the week’s strongest earthquake. Each line joins places where it was felt with the same strength.

Three questions, one screen

Pick a city and see how Isolínea would answer you with this week’s earthquake closest to it: how far away it was, how strong, how deep and what happened next.

Earthquakes from the past week, according to USGS. The “I felt it” percentages are an illustrative example.

Imagine you’re in
–

Loading the nearest earthquake…

Was it close?
Was it strong?
Was it deep?
How did people feel it? Example
Will there be more?
Nobody can predict that. What you can see is what happened next:

What happens after the quake

An earthquake doesn’t end when the ground stops moving. Here’s the sequence, and where Isolínea fits in.

  1. 0 s

    While it shakes, take cover. Early warning is someone else’s job

    Drop, cover and hold on; your phone can wait. If your country or your phone has earthquake early warning, like OVSICORI in Costa Rica or Android’s earthquake alerts, that’s the one going off now.

    Isolínea can’t arrive in time for this, and doesn’t try to. Keep your local alerts turned on.

    The waves spread out; your point doesn’t know yet.

  2. +1 min

    A minute later, people say “I felt it”

    Anyone who felt it reports it with one tap: weak, moderate, strong or very strong. Together, those reports map where it was felt most, often before any agency publishes.

    They’re isoseismals drawn by people, really.

    “I felt it” reports: bigger means stronger.

  3. 5–20 min

    The agencies publish, and your alert arrives

    USGS, EMSC and GEOFON work out the magnitude, location and depth. As soon as they publish, Isolínea puts it on the map and, if it meets what you chose for your point, alerts you.

    M7.1, 118 km from your point Sample alert.

  4. Hours

    The hours after: aftershocks and context

    After a big one, more follow. Isolínea connects them so you don’t have to guess: “Possible aftershock of yesterday’s M5.1”, “Followed by 4 smaller earthquakes”, “Swarm: 5 earthquakes in 48 h”.

    Example: followed by 4 smaller earthquakes within 24 hours.

The week on the planet

Last 7 days

World map in the Equal Earth projection showing the past week’s magnitude 4.5+ earthquakes, drawn as rings.

Swipe the map to travel around the world.

Loading this week’s earthquakes…

Each spike is an earthquake; its height, the magnitude. Hover or use the arrow keys to light it up on the map.

Magnitude

    Depth

      About this map

      Equal Earth projection, which preserves the area of every region. Magnitude 4.5+ earthquakes published by USGS in the last 7 days.

      Latest
      MagnitudePlaceDepthWhen

      See them all in the app, with filters by area and magnitude.

      What you’ll find inside

      A map you can read at a glance
      More rings and more color means stronger. A filled center is a shallow earthquake; a hollow one, a deep one. You never have to rely on color alone.
      Alerts for your point
      You choose where, how far and from what magnitude. M6+ alerts always reach you, even when they’re far away.
      Quiet hours
      At night, no alerts for small earthquakes. Strong ones still wake you up.
      Back in time
      Replay 24 hours, 7 days or 30 days on the map. Optional sound, and a light or dark theme.
      Screenshot of Isolínea on a phone: a map with earthquakes marked by colored rings, the last-24-hours summary, the I felt it button and the list of earthquakes.
      This is how it looks today in a phone browser.

      What Isolínea is not

      We’d rather say it plainly, so you can trust what it does do.

      • Not an early warning systemAlerts arrive after the earthquake, once the agencies publish it: 5 to 20 minutes later.
      • It doesn’t predict earthquakesNobody can. We show you what happened and its context, never what will happen.
      • It doesn’t replace your authoritiesIn an emergency, follow the instructions of your country’s civil protection agency.

      Your data is yours

      To alert you, all we need is roughly where you are.

      • No account to get startedWith Isolínea Free we don’t ask for your email, name or a password.
      • Your location, rounded to about 10 kmEnough to work out the distance, not to know which house you live in.
      • No adsWe don’t sell your attention or your data.
      • Delete your data whenever you wantRight from the app. Read the privacy policy.

      Free for your point. Pro for your people, wherever they are.

      Three plans, like three scales of the same map.

      Alerts for strong earthquakes are never charged for, on any plan.

      One point on the map

      Free

      US$0No account, no ads.

      • Map and list of the world’s earthquakes
      • Alerts for one point, with your own distance and minimum magnitude
      • Strong earthquakes, always
      • “I felt it”
      Try Isolínea

      Several places, in any country

      Isolínea Pro Not on sale yet

      Your people, wherever they are.

      US$2.99 a monthor US$19.99 a year

      Home, San JoséM4+ within 100 km
      Work, HerediaQuiet 10 PM to 6 AM
      Mom, in MadridM5+ within 300 km
      • For each place, its own distance, magnitude, depth and quiet hours
      • Full history and months of playback
      • Detailed “I felt it” maps and data export
      • Widgets, watch and desktop app
      • Coming soon: “I’m OK”, to let your family know
      Let me know when it’s readyWe’ll email you once, when you can turn it on.

      All your sites in one dashboard

      Isolínea Business

      from US$49a month, depending on the number of sites

      • Multiple sites in one dashboard
      • Team alerts by email, Teams, Slack or WhatsApp
      • Per-site report after every earthquake
      • API and webhooks
      Let’s talk

      It arrives after the shaking. And says so.

      What it gives you is what comes next: where it was, how strong, how far from you and whether it’s part of something bigger.

      Open Isolínea Free. No account needed.