function initMaps() {

    var mapOptions = {
      zoom: 2,
      center: {lat: 40.41140480914068, lng: -3.69140625},
      mapTypeId: google.maps.MapTypeId.TERRAIN
    };

    map = new google.maps.Map(document.getElementById('map_canvas_5'),mapOptions);

    // Create a <script> tag and set the USGS URL as the source.
    var script = document.createElement('script');
    script.src = 'http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_week.geojsonp';
    document.getElementsByTagName('head')[0].appendChild(script);
}

function eqfeed_callback(results) {
  map.data.addGeoJson(results);
}                
               
                

function initMaps() {

    var mapOptions = {
      zoom: 2,
      center: {lat: 40.41140480914068, lng: -3.69140625},
      mapTypeId: google.maps.MapTypeId.TERRAIN
    };

    map = new google.maps.Map(document.getElementById('map_canvas_5'),mapOptions);

    map6 = new google.maps.Map(document.getElementById('map_canvas_6'),mapOptions);
    map6.data.setStyle(function(feature) {
        var magnitude = feature.getProperty('mag');
        return {
          icon: getCircle(magnitude)
        };
    });

    map7 = new google.maps.Map(document.getElementById('map_canvas_7'),mapOptions);

    // Create a <script> tag and set the USGS URL as the source.
    var script = document.createElement('script');
    script.src = 'http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_week.geojsonp';
    document.getElementsByTagName('head')[0].appendChild(script);

}

function eqfeed_callback(results) {
      map.data.addGeoJson(results);
      map6.data.addGeoJson(results);

    //Build heatmap
    var heatmapData = [];
    for (var i = 0; i < results.features.length; i++) {
      var coords = results.features[i].geometry.coordinates;
      var latLng = new google.maps.LatLng(coords[1], coords[0]);
      var magnitude = results.features[i].properties.mag;
      var weightedLoc = {
        location: latLng,
        weight: Math.pow(2, magnitude)
      };
      heatmapData.push(weightedLoc);
    }
    var heatmap = new google.maps.visualization.HeatmapLayer({
      data: heatmapData,
      dissipating: false,
      map: map7
    });

}

function getCircle(magnitude) {
  var circle = {
    path: google.maps.SymbolPath.CIRCLE,
    fillColor: 'red',
    fillOpacity: .2,
    scale: Math.pow(2, magnitude) / 2,
    strokeColor: 'white',
    strokeWeight: .5
  };
  return circle;
}