News tagged with seismological society of america

Early warning systems underestimate magnitude of large earthquakes

Space & Earth / Earth Sciences

Jan 28, 2009 | not rated yet | 0

Scientists seek to create reliable early warning systems that accurately estimate the magnitude of an earthquake within the first seconds of rupture. In this paper published by the Bulletin of the Seismological Society of ...

'Fossil earthquakes' abundant

Space & Earth / Earth Sciences

Jan 28, 2009 | 3 / 5 (3) | 1

Rocks formed only under the extreme heat and friction during earthquakes, called pseudotachylytes, may be more abundant than previously reported, according to new research focused on eight faults found in the Sierra Nevada. ...

New liquefaction hazard maps of Santa Clara Valley, Northern California

Space & Earth / Earth Sciences

Jan 27, 2009 | 3 / 5 (3) | 0

New hazard maps for communities from San Jose to Palo Alto in Northern California delineate the probability of earthquake-induced liquefaction, based on three scenarios: a magnitude 7.8 on the San Andreas ...

Why do earthquakes stop?

Space & Earth / Earth Sciences

Feb 06, 2008 | 3.7 / 5 (7) | 1

The underlying structure of a fault determines whether an earthquake rupture will jump from one fault to another, magnifying its size and potential devastation. Understanding why some earthquakes terminate along a fault, ...

Historic Soviet nuclear test site offers insights for today's nuclear monitoring

Space & Earth / Earth Sciences

Apr 17, 2008 | 4.8 / 5 (4) | 0

Newly published data from the Semipalatinsk Nuclear Test Site, the Soviet Union’s primary nuclear weapons testing ground during the Cold War, can help today’s atomic detectives fine-tune their monitoring of nuclear explosions ...

Tiny tremors can track extreme storms in a warming planet

Space & Earth / Earth Sciences

Apr 17, 2008 | 5 / 5 (1) | 0

Data from faint earth tremors caused by wind-driven ocean waves—often dismissed as “background noise” at seismographic stations around the world—suggest extreme ocean storms have become more frequent over the past three decades, ...

Major population centers may be at risk; building codes must reflect new seismic data

Space & Earth / Earth Sciences

Feb 08, 2007 | 4.4 / 5 (11) | 0

Earthquakes in stable continental regions lack sufficient understanding to prepare local populations for future seismic activity, according to a paper published in the February issue of the Bulletin of the Seismological So ...

Mud pots signal possible extension of San Andreas Fault

Space & Earth / Earth Sciences

Jul 29, 2008 | 4.5 / 5 (6) | 1

A linear string of mud pots and mud volcanoes suggest surface evidence for a southern extension of the San Andreas Fault that runs through the Salton Sea, according to a paper published in the August issue of the Bulletin of ...

Possible link found between earthquakes along the Cascadia and San Andreas faults

Space & Earth / Earth Sciences

Apr 03, 2008 | 4 / 5 (6) | 2

Seismic activity on the southern Cascadia Subduction fault may have triggered major earthquakes along the northern San Andreas Fault, according to new research published by the Bulletin of Seismological Society of America. The re ...

New hazard estimates could downplay quake dangers

Space & Earth / Earth Sciences

Apr 16, 2008 | 4.7 / 5 (3) | 1

The dangers posed by a major earthquake in the New Madrid and Charleston, South Carolina zones in the Midwestern and Southern parts of the United States may be noticeably lower than current estimates if seismologists adjust ...

Predicted ground motions for great earthquake in Pacific Northwest: Seattle, Victoria and Vancouver

Space & Earth / Earth Sciences

Jun 11, 2009 | 3.8 / 5 (5) | 0

A new study evaluates expected ground motion in Seattle, Victoria and Vancouver from earthquakes of magnitude 7.5 - 9.0, providing engineers and policymakers with a new tool to build or retrofit structures to withstand seismic ...

Unearthing clues of catastrophic earthquakes

Space & Earth / Earth Sciences

Apr 16, 2008 | 3.7 / 5 (14) | 1

The destruction and disappearance of ancient cultures mark the history of human civilization, making for fascinating stories and cautionary tales. The longevity of today’s societies may depend upon separating fact from fiction, ...

New study cites lower rate of quakes along some subduction zones

Space & Earth / Earth Sciences

Dec 04, 2009 | not rated yet | 0

Most earthquakes occur along fault lines, which form boundaries between two tectonic plates. As the relative speed of the plates around a fault increases, is there a corresponding increase in the number of earthquakes produced ...

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