NEW INSIGHTS INTO CENTRE OF THE EARTH, August 15
A new observation of the very deepest part of the Earth, the solid inner core, has been reported this week in Nature. The team from the University of Bristol also observed intriguing evidence of a ‘texture’ in the solid iron that may reflect the patterns left as the swirling liquid iron of the outer core freezes to form the inner core.
Full story at
http://www.physorg.com/news138024501.html
Magnitude-5.4 Earthquake Rattles Los Angeles Area
A magnitude-5.4 earthquake rattled Los Angeles on July 29, causing strong
shaking and minor damage. The earthquake was felt from Arizona to Nevada.
Nearly 50 aftershocks have been recorded so far: most of them small, many
of them felt, and the largest being a magnitude-3.8. The last notable
earthquakes causing significant damage in the area were the January 17,
1994, magnitude-6.7 Northridge earthquake and the October 1, 1987,
magnitude-5.9 Whittier Narrows earthquake. In 1999, the magnitude-7.1
Hector Mine earthquake in a remote part of the Mojave Desert was widely
felt through the greater Los Angeles region, but caused no damage. To
listen to a podcast interview about the July 29, 2008, Los Angeles
earthquake, visit
http://www.usgs.gov/corecast/details.asp?ID=88 .
Earthquakes cannot be predicted, but earthquake-prone areas such as Los
Angeles can be prepared for earthquakes. The Great Southern California
ShakeOut, a weeklong series of special events featuring a massive
earthquake drill on November 13, 2008, in Los Angeles, is one way for the
public to prepare for the next big earthquake. To learn more about the
ShakeOut, visit
http://www.shakeout.org/ . For more information, contact
Clarice Nassif Ransom at 703-648-4299 or
cransom@usgs.gov.
Explosive Eruptions of Kasatochi, Cleveland, and Okmok Volcanoes in Alaska
Kasatochi Volcano in Alaska’s Aleutian Islands erupted explosively August
7, sending an ash plume more than 35,000 feet into the air. Kasatochi is
the third volcano to erupt in the Aleutian Islands over the last month.
Okmok Volcano erupted unexpectedly and explosively on July 12, followed by
Cleveland Volcano, 100 miles away, on July 21. These volcanic eruptions may
pose hazards to air travel in the area. Scientists are using a combination
of seismic and GPS instruments on the ground and weather and radar
satellites in space to track the progress of the eruption. The Alaska
Volcano Observatory is responsible for issuing timely warnings of potential
volcanic disasters to affected communities and civil authorities. It is
also a joint program of the USGS, the Geophysical Institute of the
University of Alaska Fairbanks, and the State of Alaska Division of
Geological and Geophysical Surveys. Information about the current eruption
of these volcanoes, including activity statements, images, background
materials, and related hazards can be found on the Alaska Volcano
Observatory’s homepage at
http://www.avo.alaska.edu/ . To listen to a
podcast interview about the Kasatochi Volcano, visit
http://www.usgs.gov/corecast/details.asp?ID=91 . For more information,
contact Jennifer Adleman at 907-786-7497 or
jadleman@usgs.gov.