Data Layer: Earthquake data

Default style

Simple style

Advanced style

View the default, simple, or advanced examples full screen or check out the reference documentation for the data layer.

JavaScript: default

var map;

google.maps.event.addDomListener(window, 'load', function() {
  map = new google.maps.Map(document.getElementById('map-canvas'), {
    center: { lat: 20, lng: -160 },
    zoom: 3
  });

  // Get the earthquake data (JSONP format)
  // This feed is a copy from the USGS feed, you can find the originals here:
  //   http://earthquake.usgs.gov/earthquakes/feed/v1.0/geojson.php
  var script = document.createElement('script');
  script.setAttribute('src',
    'https://storage.googleapis.com/maps-devrel/quakes.geo.json');
  document.getElementsByTagName('head')[0].appendChild(script);
});

// Defines the callback function referenced in the jsonp file.
function eqfeed_callback(data) {
  map.data.addGeoJson(data);
}

JavaScript: simple

var map;

google.maps.event.addDomListener(window, 'load', function() {
  map = new google.maps.Map(document.getElementById('map-canvas'), {
    center: { lat: 20, lng: -160 },
    zoom: 3
  });

  // Get the earthquake data (JSONP format)
  // This feed is a copy from the USGS feed, you can find the originals here:
  //   http://earthquake.usgs.gov/earthquakes/feed/v1.0/geojson.php
  var script = document.createElement('script');
  script.setAttribute('src',
      'https://storage.googleapis.com/maps-devrel/quakes.geo.json');
  document.getElementsByTagName('head')[0].appendChild(script);

  // Add a basic style.
  map.data.setStyle(function(feature) {
    var mag = Math.exp(parseFloat(feature.getProperty('mag'))) * 0.1;
    return /** @type {google.maps.Data.StyleOptions} */({
      icon: {
        path: google.maps.SymbolPath.CIRCLE,
        scale: mag,
        fillColor: '#f00',
        fillOpacity: 0.35,
        strokeWeight: 0
      }
    });
  });
});

// Defines the callback function referenced in the jsonp file.
function eqfeed_callback(data) {
  map.data.addGeoJson(data);
}

JavaScript: advanced

var map;
var mapStyle = [{
  'featureType': 'all',
  'elementType': 'all',
  'stylers': [{'visibility': 'off'}]
}, {
  'featureType': 'landscape',
  'elementType': 'geometry',
  'stylers': [{'visibility': 'on'}, {'color': '#fcfcfc'}]
}, {
  'featureType': 'water',
  'elementType': 'labels',
  'stylers': [{'visibility': 'off'}]
}, {
  'featureType': 'water',
  'elementType': 'geometry',
  'stylers': [{'visibility': 'on'}, {'hue': '#5f94ff'}, {'lightness': 60}]
}];

google.maps.event.addDomListener(window, 'load', function() {
  map = new google.maps.Map(document.getElementById('map-canvas'), {
    center: { lat: 20, lng: -160 },
    zoom: 3,
    styles: mapStyle
  });

  map.data.setStyle(styleFeature);

  // Get the earthquake data (JSONP format)
  // This feed is a copy from the USGS feed, you can find the originals here:
  //   http://earthquake.usgs.gov/earthquakes/feed/v1.0/geojson.php
  var script = document.createElement('script');
  script.setAttribute('src',
    'https://storage.googleapis.com/maps-devrel/quakes.geo.json');
  document.getElementsByTagName('head')[0].appendChild(script);
});

// Defines the callback function referenced in the jsonp file.
function eqfeed_callback(data) {
  map.data.addGeoJson(data);
}

function styleFeature(feature) {
  var low = [151, 83, 34];   // color of mag 1.0
  var high = [5, 69, 54];  // color of mag 6.0 and above
  var minMag = 1.0;
  var maxMag = 6.0;

  // fraction represents where the value sits between the min and max
  var fraction = (Math.min(feature.getProperty('mag'), maxMag) - minMag) /
      (maxMag - minMag);

  var color = interpolateHsl(low, high, fraction);

  return {
    icon: {
      path: google.maps.SymbolPath.CIRCLE,
      strokeWeight: 0.5,
      strokeColor: '#fff',
      fillColor: color,
      fillOpacity: 2 / feature.getProperty('mag'),
      // while an exponent would technically be correct, quadratic looks nicer
      scale: Math.pow(feature.getProperty('mag'), 2)
    },
    zIndex: Math.floor(feature.getProperty('mag'))
  };
}

function interpolateHsl(lowHsl, highHsl, fraction) {
  var color = [];
  for (var i = 0; i < 3; i++) {
    // Calculate color based on the fraction.
    color[i] = (highHsl[i] - lowHsl[i]) * fraction + lowHsl[i];
  }

  return 'hsl(' + color[0] + ',' + color[1] + '%,' + color[2] + '%)';
}

JavaScript + HTML: advanced

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <style type="text/css">
      html, body, #map-canvas {
        height: 100%;
        margin: 0px;
        padding: 0px
      }
    </style>
    <script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?v=3.exp&signed_in=true"></script>
    <script>
var map;
var mapStyle = [{
  'featureType': 'all',
  'elementType': 'all',
  'stylers': [{'visibility': 'off'}]
}, {
  'featureType': 'landscape',
  'elementType': 'geometry',
  'stylers': [{'visibility': 'on'}, {'color': '#fcfcfc'}]
}, {
  'featureType': 'water',
  'elementType': 'labels',
  'stylers': [{'visibility': 'off'}]
}, {
  'featureType': 'water',
  'elementType': 'geometry',
  'stylers': [{'visibility': 'on'}, {'hue': '#5f94ff'}, {'lightness': 60}]
}];

google.maps.event.addDomListener(window, 'load', function() {
  map = new google.maps.Map(document.getElementById('map-canvas'), {
    center: { lat: 20, lng: -160 },
    zoom: 3,
    styles: mapStyle
  });

  map.data.setStyle(styleFeature);

  // Get the earthquake data (JSONP format)
  // This feed is a copy from the USGS feed, you can find the originals here:
  //   http://earthquake.usgs.gov/earthquakes/feed/v1.0/geojson.php
  var script = document.createElement('script');
  script.setAttribute('src',
    'https://storage.googleapis.com/maps-devrel/quakes.geo.json');
  document.getElementsByTagName('head')[0].appendChild(script);
});

// Defines the callback function referenced in the jsonp file.
function eqfeed_callback(data) {
  map.data.addGeoJson(data);
}

function styleFeature(feature) {
  var low = [151, 83, 34];   // color of mag 1.0
  var high = [5, 69, 54];  // color of mag 6.0 and above
  var minMag = 1.0;
  var maxMag = 6.0;

  // fraction represents where the value sits between the min and max
  var fraction = (Math.min(feature.getProperty('mag'), maxMag) - minMag) /
      (maxMag - minMag);

  var color = interpolateHsl(low, high, fraction);

  return {
    icon: {
      path: google.maps.SymbolPath.CIRCLE,
      strokeWeight: 0.5,
      strokeColor: '#fff',
      fillColor: color,
      fillOpacity: 2 / feature.getProperty('mag'),
      // while an exponent would technically be correct, quadratic looks nicer
      scale: Math.pow(feature.getProperty('mag'), 2)
    },
    zIndex: Math.floor(feature.getProperty('mag'))
  };
}

function interpolateHsl(lowHsl, highHsl, fraction) {
  var color = [];
  for (var i = 0; i < 3; i++) {
    // Calculate color based on the fraction.
    color[i] = (highHsl[i] - lowHsl[i]) * fraction + lowHsl[i];
  }

  return 'hsl(' + color[0] + ',' + color[1] + '%,' + color[2] + '%)';
}

    </script>
  </head>
  <body id="map-container">
    <div id="map-canvas"></div>
  </body>
</html>

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies.

Last updated March 17, 2015.