distance vs time of geotagged earthquake tweets, showing seismic wave arrival : 無料・フリー素材/写真
distance vs time of geotagged earthquake tweets, showing seismic wave arrival / OpCit
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | This is a graph made and posted originally by Eric Fischer (original can be found www.flickr.com/photos/walkingsf/6076719163 here on flickr), showing distance vs. time of location-tagged tweets about the recent #earthquake. X-axis is time in seconds; y-axis is distance in miles. I added (purple line) the arrival of fastest-possible seismic p-waves (about 3.1miles per second). You can see how closely the slopes match, as people react a moment later to the quake. You can also see (darker streaks) where the p-waves have passed populated centers. Thanks for a fascinating graph, Eric! (creative-commons licensed by Eric Fisher, walkingsf on flickr) |
| 撮影日 | 2011-08-24 15:32:45 |
| 撮影者 | OpCit |
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