Taxonomy term

april 2014

Energy Notes: November 2012-2013

Oil and petroleum imports data are preliminary numbers taken from the American Petroleum Institute’s Monthly Statistical Report. For more information visit www.api.org.

14 Apr 2014

Fieldwork revises ice-free corridor hypothesis of human migration

The existence of an ice-free corridor through Canada during  the climax of last glaciation, which allowed the first Americans to cross the Bering land bridge from Siberia and move south (about 13,000 years ago), has long been postulated in North American archaeology. Now, research based on the exposure ages of glacial rocks found in the corridor suggests a puzzling conclusion — that the open pathway closed several thousand years prior to 20,000 years ago and didn’t open again until between 13,000 and 12,000 years ago, well after  first Americans were in the Americas.

13 Apr 2014

Resolving a misplaced source of volcanism in the Galapagos

Geological models have long suggested the mantle plume that built the Galápagos islands lies below Fernandina Island. Using a novel combination of seismic techniques, however, scientists have found a mantle anomaly that appears to be the Galápagos plume located 150 kilometers southeast of Fernandina Island. The new findings better explain the ongoing volcanic activity and also shed light on interactions between the mantle and crust, researchers say.

07 Apr 2014

Volcanic lightning generated in a bottle

Scientists know very little about how lightning is generated by volcanic eruptions, in large part because of the danger and difficulty in monitoring the phenomenon in the field. But a new apparatus for generating volcanic lightning in the lab may shed light on the subject.

06 Apr 2014

Social sciences improve tornado warnings

In 2013, 55 people in seven states were killed by tornadoes. Now, scientists behind a new report analyzing the effectiveness of tornado-warning processes are hoping to help reduce tornado fatalities in the 2014 storm season by combining the latest storm-tracking technology with a better understanding of how communities and people respond to tornado warnings.

03 Apr 2014

Travels in Geology: Gubbio, Italy: A geologist's mecca

The author makes a pilgrimage to the medieval Apennine mountain town of Gubbio, Italy, where studies of the limestone layers just outside the town’s encircling walls produced one of the greatest geological discoveries of the 20th century.
02 Apr 2014

Getting there and getting around Gubbio

Most flights to Italy from the U.S. land in Rome or Milan. If you are heading directly to Umbria, it is possible to fly from Rome to Perugia’s San Francesco d’Assisi airport, 42 kilometers from Gubbio. Direct international flights to Gubbio are possible only from London and a few other European cities. 
 
02 Apr 2014

The Chesapeake Bay gets some good news

The Chesapeake Bay watershed is the largest on the Atlantic seaboard, encompassing most of Maryland and Virginia, along with parts of Delaware, New York, Pennsylvania and West Virginia. More than 150 rivers flow into the system, carrying pollution and nutrient runoff from a 160,000-square-kilometer area into the bay ecosystem. A new study tracking long-term effects of the Clean Air Act has some good news about the often-poor water quality in some areas of the Chesapeake Bay watershed, but the overall picture may be complicated by hydrology.

02 Apr 2014

Massive earthquake strikes Chile

A massive magnitude-8.2 earthquake struck off the coast of Chile about 95 kilometers north of Iquique on Tuesday night at 6:46 p.m. local time, according to the U.S. Geological Survey (USGS). Because the quake occurred underwater along a thrust fault in the subduction zone, a tsunami warning was issued for several cities along the Chilean coast and around the Pacific Basin. A 2.1-meter wave was reported in some Chilean cities. Preliminary reports indicate several deaths and some damage; power is out in many areas and landslides have also been recorded, according to news reports. So far, widespread destruction — which could easily accompany such a large quake — has thankfully not been reported.  The quake followed weeks of increased seismic activity, including dozens of earthquakes up to magnitude-6.7 that have struck since March 16. It is now clear these were foreshocks. 

01 Apr 2014

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