Concentric Circles Emanating

Styled after Series of Concentric Circles Emanating from Glowing Red Dot in The Onion.

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  background: #192887;
}

.graticule {
  fill: none;
  stroke: #fff;
  stroke-width: .5px;
}

.land {
  fill: #007421;
}

.dot {
  fill: #c7141a;
}

.ring {
  fill: none;
  stroke: #c7141a;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 500;

var projection = d3.geo.mercator()
    .center([113, -3])
    .scale(1275)
    .translate([width / 2, height / 2])
    .clipExtent([[0, 0], [width, height]])
    .precision(.1);

var path = d3.geo.path()
    .projection(projection);

var graticule = d3.geo.graticule()
    .step([5, 5]);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

svg.append("path")
    .datum(graticule)
    .attr("class", "graticule")
    .attr("d", path);

svg.append("circle")
    .attr("class", "dot")
    .attr("transform", "translate(" + projection([100, -8]) + ")")
    .attr("r", 8);

setInterval(function() {
  svg.append("circle")
      .attr("class", "ring")
      .attr("transform", "translate(" + projection([100, -8]) + ")")
      .attr("r", 6)
      .style("stroke-width", 3)
      .style("stroke", "red")
    .transition()
      .ease("linear")
      .duration(6000)
      .style("stroke-opacity", 1e-6)
      .style("stroke-width", 1)
      .style("stroke", "brown")
      .attr("r", 160)
      .remove();
}, 750);

d3.json("/../../data/world-50m.json", function(error, world) {
  if (error) throw error;

svg.insert("path", ".graticule")
      .datum(topojson.feature(world, world.objects.land))
      .attr("class", "land")
      .attr("d", path);
});

d3.select(self.frameElement).style("height", height + "px");

</script>

Changed /mbostock/raw/4090846/world-50m.json to a local referenece

https://d3js.org/d3.v3.min.js

https://d3js.org/topojson.v1.min.js