New tool for monitoring nuclear tests:
Corresponding author: Stephen J. Arrowsmith of Los Alamos National Laboratory.
California’s Hayward Fault System Examined:
For Northern California, the Hayward Fault System is considered to pose the greatest risk for producing a major quake in the next 30 years. It is necessary for seismologists to understand the structure of the East Bay and the mechanics of its motion in order to anticipate what will happen during an earthquake along the Hayward Fault. Scientists from USGS-Menlo Park created the most detailed 3-D model to date of the upper crust in the East Bay and geometry of the Hayward Fault. The model reveals the motion of small Hayward Fault earthquakes to be very similar to the over-all motion of the fault, with no complexities that could bound or restrict the rupture zones of large earthquakes. Seismic hazard assessments should therefore plan for earthquakes anywhere along the fault. Further, although the Hayward and Calaveras Faults are not connected at the surface, the model revealed a smooth connection between the Hayward and Calaveras Faults at depths greater than about 3 miles. Therefore, seismic hazard assessments should assume scenario earthquakes that span parts of both faults.
Authors: Jeanne L. Hardebeck, Andrew J. Michael, and Thomas M. Brocher of USGS-Menlo Park, California.
Long-term seismic behavior of an active fault: what can we learn from a 12,000-yr-long paleo-seismic record?
Daëron and colleagues from Institut de Physique du Globe de Paris (France) present results of the first paleoseismic study of the Yammoûneh fault, which is the main on-land segment of the Levant fault system (or "Dead Sea fault") in Lebanon, a region tectonically similar to the "Big Bend" in the San Andreas fault. This area offers a long historic record that spans more than 2000 years of activity. Researchers sought to answer several questions about the frequency and magnitude of historical quakes and to understand the mechanisms at work that govern the faults. They present evidence that the latest event was the great A.D. 1202 earthquake and resolve unanswered questions about the frequency of seismic activity. Large earthquakes on different fault segments appear to cluster temporally within a couple of centuries, followed by millennial spans of relative quiescence. Authors conclude that regional risk assessment needs to prepare for the possibility of a large (M>7) earthquake striking this densely populated region in the coming century.
Corresponding author: Mathieu Daëron, currently at Caltech in Pasadena, CA
Nan Broadbent | EurekAlert!
Global study of world's beaches shows threat to protected areas
19.07.2018 | NASA/Goddard Space Flight Center
NSF-supported researchers to present new results on hurricanes and other extreme events
19.07.2018 | National Science Foundation
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Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
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