earthquake-emitter

I emit earthquake events with data about the location and magnitude.

Usage:

  var quakes = new EarthquakeEmitter()
  quakes.on('earthquake', (q) => console.log(q.properties.title))
  // M 2.6 - 8km NW of Gerlach-Empire, Nevada

Internally, I poll http://earthquake.usgs.gov for geojson data of quakes in the last 2.5 days. I store the quake ids from the last response, and compare it with the new response to figure out which quakes are new, and emit those ones.

An average earthquake payload looks a bit like this: (there are many other properties)

{
  type: 'Feature',
  properties: {
    mag: 4.7,
    place: '13km NNW of Kandrian, Papua New Guinea',
    time: 1461410344330,
  },
  geometry: {
    type: 'Point',
    coordinates: [ 149.5163, -6.101, 61.89 ]
  },
  id: 'us20005l6g'
}

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