A sequence of small earthquakes that occurred at the Dallas-Fort Worth Airport between October 30, 2008 and May 31, 2009 were likely triggered by the disposal of brines accompanying natural gas production at a nearby well that had recently been completed, according to research published in the February issue of the Bulletin of the Seismological Society of America (BSSA).
Many residents of the Dallas-Fort Worth area felt small earthquakes, which had magnitudes between 2.2 and 3.3, prompting scientists to investigate. The area, home to more than four million residents, had experienced no previous earthquakes in historic times. A significant increase since 2002 in the number of permits authorizing drilling and hydraulic fracturing to promote natural gas raised the possibility of induced earthquakes.
Researchers from University of Texas at Austin and Southern Methodist University analyzed data captured by regional and temporary seismic networks, which identified more than 180 earthquakes. Because of the absence of previous historical earthquakes, the proximity of the brine disposal well, and the similarity with other documented cases of induced seismicity in Texas, the authors suggest that the injected fluid migrated to a previously inactive fault, reactivating it.
The Dallas-Fort Worth Earthquake Sequence: October 2008 through May 2009, by Cliff Frohlich and Eric Potter of University of Texas at Austin; Chris Hayward and Brian Stump of Southern Methodist University.
Media contact: Cliff Frohlich, email@example.com, 512-471-0460
Identifying large hurricanes through seismology
Storm-generated seismic signals may allow seismologists to detect large hurricanes at sea and track their intensity, adding useful data to the discussion of whether anthropogenic global warming has increased the frequency and intensity of hurricanes and tropical storms, including ones that don't reach land.
Ambient noise, or microseisms, is the pervasive background signal bathing the surface of the Earth and is not produced by earthquakes. These surface waves generated by ocean storms are detected even in continental interiors far from source regions.
Researchers at Northwestern University demonstrate that the August 1992 category 5 Hurricane Andrew can be detected using microseisms recorded at the Harvard, Massachusetts seismic station, even while the storm is as far as 1200 miles away at sea. When applied to decades of existing analog seismograms, this methodology could yield a seismically identified hurricane record for comparison to the pre-aircraft and pre-satellite observational record.
Seismological Identification and Characterization of a Large Hurricane, by Carl W. Ebeling and Seth Stein of Northwestern University.
Media contact: Carl W. Ebeling, firstname.lastname@example.org, 847-467-1639
Southern San Andreas quake expected soon
The Coachella Valley section of the San Andreas fault, between San Gorgonio Pass and the Imperial Valley, is the only portion of the fault which has not ruptured in a major earthquake during historical time. New paleoseismic data suggests an average recurrence cycle of 116 to 221 years, indicating that it is past the expected time for a fault rupture.
Researchers from the University of Oregon and the U.S. Geological Survey have constructed an earthquake chronology for the past 1200 years for the southernmost San Andreas fault based on a new paleoseismic investigation conducted in the city of Coachella, California. Five to seven earthquakes were identified, with the last earthquake occurring at the site approximately 320 years ago. The interval since the last earthquake is as long or longer than every period of previous quiescence in the paleoseismic record.
This long period of quiescence suggests that an unusually large amount of elastic strain has built up along the southern San Andreas segment, making it likely to produce a large to great (Mw7-8) earthquake in the near future.
San Andreas Fault Earthquake Chronology and Lake Cahuilla History at Coachella, California, by Belle Philibosian of Caltech, Thomas Fumal of U.S. Geological Survey and Ray Weldon of University of Oregon.
Corresponding author: Belle Philibosian, email@example.com, 626-395-3811.
Nan Broadbent | EurekAlert!
NASA sees quick development of Hurricane Dora
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Collapse of the European ice sheet caused chaos
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An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.
Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...
Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.
Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...
Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.
As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...
Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...
Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine
Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...
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