To protect the usgs web servers from the initial burst of hits that follow felt earthquakes , the usgs earthquake web pages are cached and served through a commercial service .
The long-running study of three " benchmark " glaciers in alaska and washington state by the us geological survey ( usgs ) indicated a sharp rise in the melt rate over the last 10 or 15 years .
According to a usgs report , the united states has enough rare earth elements in the ground to meet global demand for decades to come .
根据美国航宇局的报道,美国陆面有足够的稀土元素来满足将要到来的全球稀土资源的需求。
The earthquake hit at 1355 gmt on thursday and was centred about 70 miles ( 110 km ) from the northern thai city of chiang rai , the us geological survey ( usgs ) said . The quake was shallow , at a depth of 6.2 miles ( 10km ) .
Another unique aspect of the beebe incident was that noise played a role , said paul slota , a spokesperson for the usgs national wildlife health center in madison , wisc .
Usgs researchers have been measuring the three glaciers for more than 50 years , drawing on photographs and a network of stakes driven into the glaciers to gauge the accumulation of snow during winter , and the resulting melt each spring .
A 2008 usgs assessment found egs throughout the west , where hot rocks are closer to the surface than in the east , has the potential to produce half the country 's electricity .
Since consistent record-keeping began in 1964 , the number of big temblors seen globally has stayed fairly constant : an average of 17 quakes of magnitude 7.0 or higher has been recorded each year , according to the usgs .