D3 Examples - class 3 - states // source http://jsbin.com/liqono

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<!DOCTYPE html>
<meta charset="utf-8">
<title>class 3 - states</title>
<style>
body {
  position: absolute;
  margin: 0px;
}
svg {
  background-color: #4682b4;
}
​
.info {
  font-family: sans-serif;
  color: #000;
  position: absolute;
  top: 450px;
  left: 800px;
}
path {
  fill: #555555;
  stroke: #aaaaaa;
}
</style>
<h3>Map Showing Earthquakes in US</h3>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/topojson.v2.min.js"></script>
​
<body>
​
  <script>
var width = 960, height = 500;
var data;  // declare a global variable
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
    .on("mousemove", mousemoved);
var layer = svg.append('g');
var layer2 = svg.append('g');
var info = d3.select("body").append("div")
    .attr("class", "info");
var projection = d3.geoAlbersUsa();
var path = d3.geoPath()
    .projection(projection);
  
var pathQuake = d3.geoPath()
    .pointRadius(5)
    .projection(projection);
var usgs = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_week.geojson";
  d3.json(usgs, plotQuakes);  
  function plotQuakes(error, data) {
  if (error) console.log(error);
  
  // Filter the small earthquakes
  var features = data.features;
  // Plot the earthquakes
  layer2.selectAll("path.quake")
      .data(features)
    .enter().append("path")
      .attr("class", "quake")
  .style('fill','crimson')
      .attr("d", path)
}
  
// If you use this URL, you won't need your own copy of the data.
var url = "https://umbcvis.github.io/classes/class-03/us.json"
​
  
  
  
  
d3.json(url, plotStates);
function plotStates(error, json) {
  // Create array of GeoJSON features -- this defines the global variable "data"
  data = json.objects.us.geometries.map(function(d) { return topojson.feature(json, d); })
  // Put your code here
  // Plot the features
  layer.selectAll("path")
      .data(data)
    .enter()
      .append("path")
      .attr("d", path);
}
function mousemoved() {
  info.text(formatLocation(projection.invert(d3.mouse(this)), projection.scale()));
}
function formatLocation(p, k) {
  var format = d3.format("." + Math.floor(Math.log(k) / 2 - 2) + "f");
  return (p[1] < 0 ? format(-p[1]) + "°S" : format(p[1]) + "°N") + " "
       + (p[0] < 0 ? format(-p[0]) + "°W" : format(p[0]) + "°E");
}
​
  var map;
function initMap() {
  map = new google.maps.Map(document.getElementById('map'), {
    zoom: 2,
    center: new google.maps.LatLng(2.8,-187.3),
    mapTypeId: 'terrain'
  });
​
  // Create a <script> tag and set the USGS URL as the source.
  var script = document.createElement('script');
  // This example uses a local copy of the GeoJSON stored at
  // https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_week.geojsonp
  script.src = 'https://developers.google.com/maps/documentation/javascript/examples/json/earthquake_GeoJSONP.js';
  document.getElementsByTagName('head')[0].appendChild(script);
}
​
// Loop through the results array and place a marker for each
// set of coordinates.
window.eqfeed_callback = function(results) {
  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 marker = new google.maps.Marker({
      position: latLng,
      map: map
    });
  }
}
​
  </script>
​
​
    