Researchers are using Google Earth, the New York Times/IHT reports, to look for evidence of giant tsunamis, signs that the Earth has been hit by comets or asteroids more regularly, and more recently, than people thought: This year the group started using Google Earth, a free source of satellite images, to search around the globe for chevrons, which they interpret as evidence of past giant tsunamis. Scores of such sites have turned up in Australia, Africa, Europe and the United States, including the Hudson River Valley and Long Island. Chevrons are huge deposits of sediment that were once on the bottom of the ocean; they
More from Google Trends, the sad rise and fall in our interest in the tsunami: At the end of 2004, the Asian Tsunami piqued/peaked our attention, but the later blips (F, the last little flag on the chart, is the first anniversay) reflect, perhaps, how quickly such things are forgotten.
The Asian tsunami, and the quake near Nias, bring home how volatile the region is, particularly Indonesia. (Another quake this morning sent Nias residents fleeing into the hills in panic.) But I thought an interesting way of illustrating this volatility might be to do a sparkline of earthquakes and their magnitude around the world in the last week, highlighting those in Indonesia (most, but not only, around Sumatra) in orange: Of course, it would be better to show their depth as well, but the sparklines tool I’m using, the excellent SparkMaker from Bissantz, is not yet up to the task. Data is from the USGS