Devastating long-distance impact of earthquakes

In 2006 the island of Java, Indonesia was struck by a devastating earthquake followed by the onset of a mud eruption to the east, flooding villages over several square kilometers and that continues to erupt today. Until now, researchers believed the earthquake was too far from the mud volcano to trigger the eruption. Geophysicists have now use computer-based simulations to show that such triggering is possible over long distances.
Source: http://www.sciencedaily.com/releases/2013/07/130723073957.htm

Some volcanoes ‘scream’ at ever higher pitches until they blow their tops

Swarms of small earthquakes can precede a volcanic eruption, sometimes resulting in “harmonic tremor” resembling sound from some musical instruments. A new analysis shows tremor during a 2009 sequence at Alaska’s Redoubt Volcano glided to substantially higher frequencies, then stopped abruptly just before six of the eruptions.
Source: http://www.sciencedaily.com/releases/2013/07/130714160521.htm

Induced seismicity? Recent spike of earthquakes in the central and eastern U.S. may be linked to human activity

The number of earthquakes has increased dramatically over the past few years within the central and eastern United States. More than 300 earthquakes above a magnitude 3.0 occurred in the three years from 2010-2012, compared with an average rate of 21 events per year observed from 1967-2000. This increase in earthquakes prompts two important questions: Are they natural, or human-made? And what should be done in the future as we address the causes and consequences of these events to reduce associated risks? U.S. Geological Survey scientists have been analyzing the changes in the rate of earthquakes as well as the likely causes, and they have some answers.
Source: http://www.sciencedaily.com/releases/2013/07/130712095205.htm

Distant earthquakes trigger tremors at U.S. waste-injection sites, says study

Large earthquakes from distant parts of the globe are setting off tremors around waste-fluid injection wells in the central United States, says a new study. Furthermore, such triggering of minor quakes by distant events could be precursors to larger events at sites where pressure from waste injection has pushed faults close to failure, say researchers. Among the sites covered are central Oklahoma, western Texas and southern Colorado.
Source: http://www.sciencedaily.com/releases/2013/07/130711142401.htm

Location of upwelling in Earth’s mantle discovered to be stable

A new study shows that large-scale upwelling within Earth’s mantle mostly occurs in only two places: Beneath Africa and the Central Pacific. These upwelling locations have remained remarkably stable over geologic time, despite dramatic reconfigurations of tectonic plate motions and continental locations on the Earth’s surface. The study describes a plate tectonic “quadrupole,” which defines two points of “net convergence” and two points of “net divergence” of tectonic plate motions.
Source: http://www.sciencedaily.com/releases/2013/06/130626142936.htm

Seismic gap outside of Istanbul: Is this where the expected Marmara earthquake will originate from?

Earthquake researchers have now identified a 30 kilometers long and ten kilometers deep area along the North Anatolian fault zone just south of Istanbul that could be the starting point for a strong earthquake. The group of seismologists say that this potential earthquake source is only 15 to 20 kilometers from the historic city center of Istanbul.
Source: http://www.sciencedaily.com/releases/2013/06/130618113717.htm

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