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Last active December 11, 2015 23:29
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Christchurch Earthquakes, 2010

Hexbinning earthquakes (magnitude 3.0 or greater) in the Canterbury region of New Zealand during the month of September, 2010.

Earthquake data sourced from GeoNet.

<!DOCTYPE html>
<html>
<head>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/d3.hexbin.v0.js"></script>
<style type="text/css">
html, body { margin: 0; padding: 0; height: 100%; }
select {
display: inline;
}
.axis text {
font: 10px sans-serif;
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
div#switcher { margin: 0em 2.5em 1em; }
p { margin-top: 0; }
</style>
</head>
<body>
<div id="quake" data-source="quakes_christchurch_20100901-20101001_mag-gt3.json"></div>
<div id="switcher">
<p>
Display
<select id="y-select" disabled>
<option value="magnitude">magnitude</option>
<option value="depth">depth</option>
<option value="phases">phases</option>
</select>
over time.
</p>
</div>
<script type="text/javascript">
(function () {
var features, key, current, x, y,
labels = {
'magnitude': "Magnitude",
'depth': "Depth (km)",
'phases': "Phases"
},
views = {},
container = document.getElementById('quake');
var rad = 16,
margin = {top: 12, right: 3, bottom: 38, left: 45},
width = 960 - margin.left - margin.right,
height = 450 - margin.top - margin.bottom;
var svg = d3.select(container).append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var y_select = d3.select("#y-select")
.on("change", function (e) {
var el = y_select.node();
key = el.options[el.selectedIndex].value;
update();
});
svg.append("clipPath")
.attr("id", "clip")
.append("rect")
.attr("class", "mesh")
.attr("width", width - 1)
.attr("height", height - .25)
.attr("transform", "translate(1,0)");
var hexbin = d3.hexbin()
.size([width, height])
.radius(rad)
.x(function (d) { return x(get_date(d)); });
d3.json(container.dataset.source, function(collection) {
var el = y_select.node();
features = collection.features;
key = el.options[el.selectedIndex].value;
init();
update();
el.removeAttribute("disabled");
});
function init() {
x = d3.time.scale()
.domain(d3.extent(features, get_date))
.range([0, width]);
}
function update() {
if (!(key in views)) {
views[key] = createView();
}
enableView(views[key]);
}
function createView() {
var view = svg.append("g")
.attr("id", "view-" + key)
.style("display", "none");
var y = d3.scale.linear()
.domain(d3.extent(features, get_y))
.range([height, 0]);
hexbin.y(function (d) { return y(get_y(d)); });
var bin = hexbin(features),
color = d3.scale.linear()
.domain(d3.extent(bin, function (d) { return d.length; }))
.range([d3.lab("white").darker(.2), d3.lab("#A40000")])
.interpolate(d3.interpolateLab);
view.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(d3.svg.axis().scale(x).orient("bottom"))
.append("text")
.attr("class", "label")
.attr("x", width)
.attr("y", 35)
.style("text-anchor", "end")
.text("Earthquake origin time");
view.append("g")
.attr("class", "y axis")
.call(d3.svg.axis().scale(y).orient("left"))
.append("text")
.attr("class", "label")
.attr("transform", "rotate(-90)")
.attr("y", -40)
.attr("dy", ".71em")
.style("text-anchor", "end")
.text(labels[key]);
view.append("g")
.attr("clip-path", "url(#clip)")
.selectAll(".hexagon")
.data(bin)
.enter().append("path")
.attr("class", "hexagon")
.attr("d", hexbin.hexagon())
.attr("transform", function (d) { return "translate(" + d.x + "," + d.y + ")"; })
.attr("fill", function (d) { return color(d.length); });
return view;
}
function enableView(view) {
if (current) {
current.style("display", "none");
}
view.style("display", "inline");
current = view;
}
function get_date(d) {
return d3.time.format.iso.parse(d.properties.origintime);
}
function get_y(d) {
return d.properties[key];
}
}());
</script>
</body>
</html>
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