Slt tout le monde et bon 15 Aout!pour infos: Nearly 1,000 earthquakes <br />
recorded in Arizona over 3 years<br />
<br />
August 14, 2012<br />
Nearly 1,000 earthquakes recorded in Arizona over 3 years<br />
<br />
Enlarge<br />
<br />
Nearly 60 USArray stations were installed in Arizona from 2006 to 2009 <br />
as part of the EarthScope project. Station 118A, seen in this photo, <br />
recorded ground motion north of Wilcox in southeastern Arizona from <br />
April 6, 2007 to Jan. 21, 2009. Credit: Incorporated Research <br />
Institutions for Seismology (funded by NSF EarthScope)<br />
<br />
Arizona State University researchers use EarthScope data to build the <br />
first comprehensive earthquake catalog for Arizona.<br />
<br />
Ads by Google<br />
<br />
Endless Appetites - A book about feeding the planet, in bookstores near <br />
you! - www.facebook.com/endless.appetites<br />
<br />
Earthquakes are among the most destructive and common of geologic <br />
phenomena. Several million earthquakes are estimated to occur worldwide <br />
each year (the vast majority are too small to feel, but their motions <br />
can be measured by arrays of seismometers). Historically, most of <br />
Arizona has experienced low levels of recorded seismicity, with <br />
infrequent moderate and large earthquakes in the state. Comprehensive <br />
analyses of seismicity within Arizona have not been previously possible <br />
due to a lack of seismic stations in most regions, contributing to the <br />
perception that widespread earthquakes in Arizona are rare. Debunking <br />
that myth, a new study published by Arizona State University researchers<br />
found nearly 1,000 earthquakes rattling the state over a three-year <br />
period.<br />
<br />
Jeffrey Lockridge, a graduate student in ASU's School of Earth and Space<br />
Exploration and the project's lead researcher, used new seismic data <br />
collected as part of the EarthScope project to develop methods to detect<br />
and locate small-magnitude earthquakes across the entire state of <br />
Arizona. EarthScope's USArray Transportable Array was deployed within <br />
Arizona from April 2006 to March 2009 and provided the first opportunity<br />
to examine seismicity on a statewide scale. Its increased sensitivity <br />
allowed Lockridge to find almost 1,000 earthquakes during the three-year<br />
period, including many in regions of Arizona that were previously <br />
thought to be seismically inactive.<br />
<br />
"It is significant that we found events in areas where none had been <br />
detected before, but not necessarily surprising given the fact that many<br />
parts of the state had never been sampled by seismometers prior to the <br />
deployment of the EarthScope USArray," says Lockridge. "I expected to <br />
find some earthquakes outside of north-central Arizona, where the most <br />
and largest events had previously been recorded, just not quite so many <br />
in other areas of the state."<br />
<br />
Ads by Google<br />
<br />
Complete Hazmat Advice - Innovative hazmat / CBRN incident software for <br />
emergency responders - www.hazmatlink.com<br />
<br />
One-thousand earthquakes over three years may sound alarmingly high, but<br />
the large number of earthquakes detected in the study is a direct <br />
result of the improved volume and quality of seismic data provided by <br />
EarthScope. Ninety-one percent of the earthquakes Lockridge detected in <br />
Arizona were "microquakes" with a magnitude of 2.0 or smaller, which are<br />
not usually felt by humans. Detecting small-magnitude earthquakes is <br />
not only important because some regions experiencing small earthquakes <br />
may produce larger earthquakes, but also because geologists use small <br />
magnitude earthquakes to map otherwise hidden faults beneath the <br />
surface.<br />
<br />
Historically, the largest earthquakes and the majority of seismicity <br />
recorded within Arizona have been located in an area of north–central <br />
Arizona. More recently, a pair of magnitude 4.9 and 5.3 earthquakes <br />
occurred in the Cataract Creek area outside of Flagstaff. Earthquakes of<br />
magnitude 4.0 or larger also have occurred in other areas of the state,<br />
including a magnitude 4.2 earthquake in December 2003 in eastern <br />
Arizona and a magnitude 4.9 earthquake near Chino Valley in 1976.<br />
<br />
"The wealth of data provided by the EarthScope project is an <br />
unprecedented opportunity to detect and locate small-magnitude <br />
earthquakes in regions where seismic monitoring (i.e. seismic stations) <br />
has historically been sparse," explains Lockridge. "Our study is the <br />
first to use EarthScope data to build a regional catalog that detects <br />
all earthquakes magnitude 1.2 or larger."<br />
<br />
His results appear in a paper titled, "Seismicity within Arizona during <br />
the Deployment of the EarthScope USArray Transportable Array," published<br />
in the August 2012 issue of the Bulletin of the Seismological Society <br />
of America. Ramon Arrowsmith and Matt Fouch, professors in ASU's School <br />
of Earth and Space Exploration, are Lockridge's dissertation advisors <br />
and coauthors on the paper. Fouch is also a geophysicist at the Carnegie<br />
Institution's Department of Terrestrial Magnetism in Washington, DC.<br />
<br />
"The most surprising result was the degree to which the EarthScope data <br />
were able to improve upon existing catalogs generated by regional and <br />
national networks. From April 2007 through November 2008, other networks<br />
detected only 80 earthquakes within the state, yet over that same time <br />
we found 884 earthquakes, or 11 times as many, which is really quite <br />
staggering," says Lockridge. "It's one of countless examples of how <br />
powerful the EarthScope project is and how much it is improving our <br />
ability to study Earth."<br />
<br />
Lockridge is also lead author on a study that focuses on a cluster of <br />
earthquakes located east of Phoenix, near Theodore Roosevelt Lake. The <br />
results from this study will be published in Seismological Research <br />
Letters later this year. In his current studies as doctoral student, <br />
Lockridge is using the same methods used for Arizona to develop a <br />
comprehensive earthquake catalog for the Great Basin region in Nevada <br />
and western Utah.<br />
<br />
Provided by Arizona State University Read more at: http://phys.org/news/2012-08-earthquakes-arizona-years.html#jCphttp://phys.org/news/2012-08-earthquakes-arizona-years.htmlNearly 1,000 earthquakes <br />
recorded in Arizona over 3 years<br />
<br />
August 14, 2012<br />
Nearly 1,000 earthquakes recorded in Arizona over 3 years<br />
<br />
Enlarge<br />
<br />
Nearly 60 USArray stations were installed in Arizona from 2006 to 2009 <br />
as part of the EarthScope project. Station 118A, seen in this photo, <br />
recorded ground motion north of Wilcox in southeastern Arizona from <br />
April 6, 2007 to Jan. 21, 2009. Credit: Incorporated Research <br />
Institutions for Seismology (funded by NSF EarthScope)<br />
<br />
Arizona State University researchers use EarthScope data to build the <br />
first comprehensive earthquake catalog for Arizona.<br />
<br />
Ads by Google<br />
<br />
Endless Appetites - A book about feeding the planet, in bookstores near <br />
you! - www.facebook.com/endless.appetites<br />
<br />
Earthquakes are among the most destructive and common of geologic <br />
phenomena. Several million earthquakes are estimated to occur worldwide <br />
each year (the vast majority are too small to feel, but their motions <br />
can be measured by arrays of seismometers). Historically, most of <br />
Arizona has experienced low levels of recorded seismicity, with <br />
infrequent moderate and large earthquakes in the state. Comprehensive <br />
analyses of seismicity within Arizona have not been previously possible <br />
due to a lack of seismic stations in most regions, contributing to the <br />
perception that widespread earthquakes in Arizona are rare. Debunking <br />
that myth, a new study published by Arizona State University researchers<br />
found nearly 1,000 earthquakes rattling the state over a three-year <br />
period.<br />
<br />
Jeffrey Lockridge, a graduate student in ASU's School of Earth and Space<br />
Exploration and the project's lead researcher, used new seismic data <br />
collected as part of the EarthScope project to develop methods to detect<br />
and locate small-magnitude earthquakes across the entire state of <br />
Arizona. EarthScope's USArray Transportable Array was deployed within <br />
Arizona from April 2006 to March 2009 and provided the first opportunity<br />
to examine seismicity on a statewide scale. Its increased sensitivity <br />
allowed Lockridge to find almost 1,000 earthquakes during the three-year<br />
period, including many in regions of Arizona that were previously <br />
thought to be seismically inactive.<br />
<br />
"It is significant that we found events in areas where none had been <br />
detected before, but not necessarily surprising given the fact that many<br />
parts of the state had never been sampled by seismometers prior to the <br />
deployment of the EarthScope USArray," says Lockridge. "I expected to <br />
find some earthquakes outside of north-central Arizona, where the most <br />
and largest events had previously been recorded, just not quite so many <br />
in other areas of the state."<br />
<br />
Ads by Google<br />
<br />
Complete Hazmat Advice - Innovative hazmat / CBRN incident software for <br />
emergency responders - www.hazmatlink.com<br />
<br />
One-thousand earthquakes over three years may sound alarmingly high, but<br />
the large number of earthquakes detected in the study is a direct <br />
result of the improved volume and quality of seismic data provided by <br />
EarthScope. Ninety-one percent of the earthquakes Lockridge detected in <br />
Arizona were "microquakes" with a magnitude of 2.0 or smaller, which are<br />
not usually felt by humans. Detecting small-magnitude earthquakes is <br />
not only important because some regions experiencing small earthquakes <br />
may produce larger earthquakes, but also because geologists use small <br />
magnitude earthquakes to map otherwise hidden faults beneath the <br />
surface.<br />
<br />
Historically, the largest earthquakes and the majority of seismicity <br />
recorded within Arizona have been located in an area of north–central <br />
Arizona. More recently, a pair of magnitude 4.9 and 5.3 earthquakes <br />
occurred in the Cataract Creek area outside of Flagstaff. Earthquakes of<br />
magnitude 4.0 or larger also have occurred in other areas of the state,<br />
including a magnitude 4.2 earthquake in December 2003 in eastern <br />
Arizona and a magnitude 4.9 earthquake near Chino Valley in 1976.<br />
<br />
"The wealth of data provided by the EarthScope project is an <br />
unprecedented opportunity to detect and locate small-magnitude <br />
earthquakes in regions where seismic monitoring (i.e. seismic stations) <br />
has historically been sparse," explains Lockridge. "Our study is the <br />
first to use EarthScope data to build a regional catalog that detects <br />
all earthquakes magnitude 1.2 or larger."<br />
<br />
His results appear in a paper titled, "Seismicity within Arizona during <br />
the Deployment of the EarthScope USArray Transportable Array," published<br />
in the August 2012 issue of the Bulletin of the Seismological Society <br />
of America. Ramon Arrowsmith and Matt Fouch, professors in ASU's School <br />
of Earth and Space Exploration, are Lockridge's dissertation advisors <br />
and coauthors on the paper. Fouch is also a geophysicist at the Carnegie<br />
Institution's Department of Terrestrial Magnetism in Washington, DC.<br />
<br />
"The most surprising result was the degree to which the EarthScope data <br />
were able to improve upon existing catalogs generated by regional and <br />
national networks. From April 2007 through November 2008, other networks<br />
detected only 80 earthquakes within the state, yet over that same time <br />
we found 884 earthquakes, or 11 times as many, which is really quite <br />
staggering," says Lockridge. "It's one of countless examples of how <br />
powerful the EarthScope project is and how much it is improving our <br />
ability to study Earth."<br />
<br />
Lockridge is also lead author on a study that focuses on a cluster of <br />
earthquakes located east of Phoenix, near Theodore Roosevelt Lake. The <br />
results from this study will be published in Seismological Research <br />
Letters later this year. In his current studies as doctoral student, <br />
Lockridge is using the same methods used for Arizona to develop a <br />
comprehensive earthquake catalog for the Great Basin region in Nevada <br />
and western Utah.<br />
<br />
Provided by Arizona State University Read more at: http://phys.org/news/2012-08-earthquakes-arizona-years.html#jCpNearly 1,000 earthquakes <br />
recorded in Arizona over 3 years<br />
<br />
August 14, 2012<br />
Nearly 1,000 earthquakes recorded in Arizona over 3 years<br />
<br />
Enlarge<br />
<br />
Nearly 60 USArray stations were installed in Arizona from 2006 to 2009 <br />
as part of the EarthScope project. Station 118A, seen in this photo, <br />
recorded ground motion north of Wilcox in southeastern Arizona from <br />
April 6, 2007 to Jan. 21, 2009. Credit: Incorporated Research <br />
Institutions for Seismology (funded by NSF EarthScope)<br />
<br />
Arizona State University researchers use EarthScope data to build the <br />
first comprehensive earthquake catalog for Arizona.<br />
<br />
Ads by Google<br />
<br />
Endless Appetites - A book about feeding the planet, in bookstores near <br />
you! - www.facebook.com/endless.appetites<br />
<br />
Earthquakes are among the most destructive and common of geologic <br />
phenomena. Several million earthquakes are estimated to occur worldwide <br />
each year (the vast majority are too small to feel, but their motions <br />
can be measured by arrays of seismometers). Historically, most of <br />
Arizona has experienced low levels of recorded seismicity, with <br />
infrequent moderate and large earthquakes in the state. Comprehensive <br />
analyses of seismicity within Arizona have not been previously possible <br />
due to a lack of seismic stations in most regions, contributing to the <br />
perception that widespread earthquakes in Arizona are rare. Debunking <br />
that myth, a new study published by Arizona State University researchers<br />
found nearly 1,000 earthquakes rattling the state over a three-year <br />
period.<br />
<br />
Jeffrey Lockridge, a graduate student in ASU's School of Earth and Space<br />
Exploration and the project's lead researcher, used new seismic data <br />
collected as part of the EarthScope project to develop methods to detect<br />
and locate small-magnitude earthquakes across the entire state of <br />
Arizona. EarthScope's USArray Transportable Array was deployed within <br />
Arizona from April 2006 to March 2009 and provided the first opportunity<br />
to examine seismicity on a statewide scale. Its increased sensitivity <br />
allowed Lockridge to find almost 1,000 earthquakes during the three-year<br />
period, including many in regions of Arizona that were previously <br />
thought to be seismically inactive.<br />
<br />
"It is significant that we found events in areas where none had been <br />
detected before, but not necessarily surprising given the fact that many<br />
parts of the state had never been sampled by seismometers prior to the <br />
deployment of the EarthScope USArray," says Lockridge. "I expected to <br />
find some earthquakes outside of north-central Arizona, where the most <br />
and largest events had previously been recorded, just not quite so many <br />
in other areas of the state."<br />
<br />
Ads by Google<br />
<br />
Complete Hazmat Advice - Innovative hazmat / CBRN incident software for <br />
emergency responders - www.hazmatlink.com<br />
<br />
One-thousand earthquakes over three years may sound alarmingly high, but<br />
the large number of earthquakes detected in the study is a direct <br />
result of the improved volume and quality of seismic data provided by <br />
EarthScope. Ninety-one percent of the earthquakes Lockridge detected in <br />
Arizona were "microquakes" with a magnitude of 2.0 or smaller, which are<br />
not usually felt by humans. Detecting small-magnitude earthquakes is <br />
not only important because some regions experiencing small earthquakes <br />
may produce larger earthquakes, but also because geologists use small <br />
magnitude earthquakes to map otherwise hidden faults beneath the <br />
surface.<br />
<br />
Historically, the largest earthquakes and the majority of seismicity <br />
recorded within Arizona have been located in an area of north–central <br />
Arizona. More recently, a pair of magnitude 4.9 and 5.3 earthquakes <br />
occurred in the Cataract Creek area outside of Flagstaff. Earthquakes of<br />
magnitude 4.0 or larger also have occurred in other areas of the state,<br />
including a magnitude 4.2 earthquake in December 2003 in eastern <br />
Arizona and a magnitude 4.9 earthquake near Chino Valley in 1976.<br />
<br />
"The wealth of data provided by the EarthScope project is an <br />
unprecedented opportunity to detect and locate small-magnitude <br />
earthquakes in regions where seismic monitoring (i.e. seismic stations) <br />
has historically been sparse," explains Lockridge. "Our study is the <br />
first to use EarthScope data to build a regional catalog that detects <br />
all earthquakes magnitude 1.2 or larger."<br />
<br />
His results appear in a paper titled, "Seismicity within Arizona during <br />
the Deployment of the EarthScope USArray Transportable Array," published<br />
in the August 2012 issue of the Bulletin of the Seismological Society <br />
of America. Ramon Arrowsmith and Matt Fouch, professors in ASU's School <br />
of Earth and Space Exploration, are Lockridge's dissertation advisors <br />
and coauthors on the paper. Fouch is also a geophysicist at the Carnegie<br />
Institution's Department of Terrestrial Magnetism in Washington, DC.<br />
<br />
"The most surprising result was the degree to which the EarthScope data <br />
were able to improve upon existing catalogs generated by regional and <br />
national networks. From April 2007 through November 2008, other networks<br />
detected only 80 earthquakes within the state, yet over that same time <br />
we found 884 earthquakes, or 11 times as many, which is really quite <br />
staggering," says Lockridge. "It's one of countless examples of how <br />
powerful the EarthScope project is and how much it is improving our <br />
ability to study Earth."<br />
<br />
Lockridge is also lead author on a study that focuses on a cluster of <br />
earthquakes located east of Phoenix, near Theodore Roosevelt Lake. The <br />
results from this study will be published in Seismological Research <br />
Letters later this year. In his current studies as doctoral student, <br />
Lockridge is using the same methods used for Arizona to develop a <br />
comprehensive earthquake catalog for the Great Basin region in Nevada <br />
and western Utah.<br />
<br />
Provided by Arizona State University Read more at: http://phys.org/news/2012-08-earthquakes-arizona-years.html#jCp
Salut Damien,Je viens de visionner cette vidéo de TEX :http://www.ted.com/talks/lang/fr/jon_nguyen_tour_the_solar_system_from_home.html(sous-titres français)Je ne sais pas si tu connaissais ce logiciel gratuit.Le lien pour le logiciel de la NASA évoqué dans la vidéo est celui-ci :http://eyes.nasa.gov/Bisous.PS : des news de Titi ?
/https%3A%2F%2Fassets.over-blog.com%2Ft%2Fcedistic%2Fcamera.png)