A powerful computational study of southern California seismic records has revealed detailed information about a plethora of previously undetected small earthquakes, giving a more precise picture about stress in the earth's crust.
It is still unclear what exactly happens when lightning develops. Based on high-resolution data of the LOFAR radio telescope, an international team of researchers has now discovered needle-shaped structures. They might help to explain why lightning does not always discharge at once, as was thought for a long time, but can strike several times within seconds. Essential foundations for measuring lightning with the world's largest antenna array were laid at KIT.
Nearly 1.8 million tiny tremblors have been added to the catalog of total seismic events in Southern California over the past decade, reports a new study, which details the most comprehensive earthquake catalog to date.
Geologic time scales are critical to understanding the timing, duration, and connection of geologic events. They are not static, and can be improved with research, integration, and refinements realized from biostratigraphic repetitive analysis. Over the past century they have proven important tools in petroleum exploration and studies of climatic and geologic events. Still, many geologists may not know the importance of microfossils to the construction of time scales and biostratigraphy.
On March 17, 2002, the satellite duo GRACE was launched to map the Earth's gravity field more precisely than ever before. The measurements make it possible to monitor the terrestrial water cycle, the mass balance of ice sheets and glaciers or changes in sea levels. This helps to better understand important trends in the global climate system. A review in the journal Nature Climate Change now presents the mission highlights in climate research.
Logging activity a century ago on a Washington river caused the bedrock to erode, creating a new terrace. The authors believe such large-scale, human-caused erosion may be widespread.
A recent study shows that nitrous oxide emissions from thawing Alaskan permafrost are about twelve times higher than previously assumed. About one fourth of the Northern Hemisphere is covered in permafrost, which is thawing at an increasing rate. As temperatures increase, the peat releases more and more greenhouse gases. And, even though researchers are monitoring carbon dioxide and methane, no one seems to be watching the most potent greenhouse gas: nitrous oxide.
The origin of giant apatite-iron oxide ores of the so-called 'Kiruna-type' has been the topic of a long standing debate that has lasted for over 100 years. In a new article, published in Nature Communications, a team of scientists presents new and unambiguous data in favour of a magmatic origin for these important iron ores. The study was led by researchers from Uppsala University in Sweden.
Not only will this discovery be important for agriculture, aviation and weather prediction, but it will also be vital for climate change research and associated sea-level rise, as accurate prediction of katabatic surface wind profiles over large ice sheets and glaciers is critical in energy balance of melting ice.
Overpumping in California's Central Valley has depleted groundwater storage capacity and caused the land to sink. A new model based on remote sensing data could help zero in on where water managers can replenish aquifers by flooding fields.