The United States Geological Survey provides earthquake data through API endpoints. The API endpoint can be modified using the search tool to adjust the data returned. For example, https://earthquake.usgs.gov/fdsnws/event/1/query.geojson?starttime=2019-07-26%2000:00:00&endtime=2019-08-25%2023:59:59&maxlatitude=73.786&minlatitude=-62.005&maxlongitude=-18.281&minlongitude=-172.969&minmagnitude=4.5&orderby=time returns all magnitude 4.5 and above events occuring in the 30 day period of July 26, 2019 to August 25, 2019 in a specific rectangular region.
- D3 V4 is used to query the URL for the earthquake data and tectonic plate boundaries. The results are returned as geoJSON objects.
- Leaflet is used to map the earthquakes and tectonic plate boundaries.
- Tile layers are supplied by ESRI. If you are using a tile provider that requires an API key, such as mapbox, the code can be modified to
supply the api key in one of three ways:
- Supply the API key in the
config.jsfile and uncomment the line loading this file inindex.html. - Uncomment the line in
logic.jsthat gives the API key. - Uncomment the line in
logic.jsthat prompts the user for an API key through a dialog.
- Supply the API key in the
- Earthquakes are represented by circles with size proportional to the magnitude of the earthquake. A color scale for the magnitude is also applied to the circle. An informative pop-up is applied to each circle.
- Tectonic plates are represented as lines.
- A legend is supplied for the color scale.
- Tile layers are supplied by ESRI. If you are using a tile provider that requires an API key, such as mapbox, the code can be modified to
supply the api key in one of three ways:
- A map control can toggle between tile layers.
- An additional map control toggles the earthquake data and plate data on or off. If the earthquake data is toggled off, the legend is removed from the map.