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, firstname.lastname@example.org, 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, email@example.com, 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, firstname.lastname@example.org, 626-395-3811.
Nan Broadbent | EurekAlert!
Oasis of life in the ice-covered central Arctic
24.10.2016 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
Receding glaciers in Bolivia leave communities at risk
20.10.2016 | European Geosciences Union
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
24.10.2016 | Earth Sciences
24.10.2016 | Life Sciences
24.10.2016 | Physics and Astronomy