First EarthScope 'transportable array' seismic station reaches U.S. east coast

Feb 16, 2012 By Cheryl Dybas
Transportable Array Station 457A in Florida: first such seismic station on the U.S. East Coast. Credit: IRIS

Yulee, Florida. Not a place one usually thinks of as an Earthquake Epicenter.

But this swampland not far from the Georgia state line is now home to a state-of-the-art seismic station known as 457A.

Here, within a few miles of the Atlantic Ocean, 457A has been installed to record from earthquakes. Earthquakes do happen on the East Coast of the United States, as the Virginia quake of August, 2011 attests.

The new is part of EarthScope, a project funded by the National Science Foundation (NSF). It's one of some 400 stations collectively called the Transportable Array.

The array has--one-by-one--slowly been making its way across the country in a wave of instrumentation. Transportable Array Station 457A is the first such station to reach the East Coast.

On the West Coast in 2004, the array started its eastward migration. As it moved, it transmitted information from more than 1,350 locations across the United States.

By the end of 2013, the array's East Coast stations will occupy 400 sites from Florida in the south to Michigan and Maine in the north, including sites in the southernmost regions of Ontario and Quebec, Canada.

From the array, a CT scan-like, 3-D image of Earth's mantle under Western North America. Credit: Richard Allen/UC-Berkeley

Researchers placed the stations in a grid approximately 70 kilometers, or some 43 miles, apart each operates for about two years.

Data recorded by the seismometers help scientists develop a better understanding of the geologic structure inside the North American continent.

"Scientists can use these data to generate 3-D images of Earth's interior that are very similar to CT scans in medicine," says Greg Anderson, NSF program director for EarthScope. "The images show Earth's structure from the core to the surface in never-before-seen detail."

A vault with the transmitting seismometer is closed, then a mound of dirt is piled on top.Credit: IRIS

"With the installation of 457A," says Anderson, "the Transportable Array has stations active on all four coasts of the 'lower 48': Pacific, Atlantic, Great Lakes and ."

Each station is self-contained, using to recharge the batteries that provide power to the seismometer and other sensors and electronic systems. The entire instrument is placed in a vault and buried six feet below the surface.

"Because the western part of the country regularly experiences earthquakes, that region has dozens of permanent seismometers to observe fault movements," says Bob Woodward, director of the USArray, the seismic component of EarthScope.

EarthScope's installation plan for the Transportable Array as it marches across the nation. Credit: IRIS

"Seismic stations in the eastern third of the U.S. are much less common, although earthquakes do occur, as we all learned last August."

Transportable Array seismometers are extremely sensitive. They can detect earthquakes at magnitude 5.0 or greater--"sensing" them as far away as the opposite side of the planet--as well as record smaller quakes that occur regionally and locally.

Each station includes a high-performance barometer and an infrasound microphone, and sensors to record temperature and pressure.

Data collected by the station's instruments are transmitted in real-time to the Array Network Facility at the University of California, San Diego, then archived at the IRIS (Incorporated Research Institutions for Seismology) Data Management Center in Seattle for use by researchers around the world.

From its underground crypt, 457A will be sending messages to geologists--and to all of us.

Explore further: NASA balloons begin flying in Antarctica for 2014 campaign

More information: For more information, please see the EarthScope Web site.

add to favorites email to friend print save as pdf

Related Stories

Project seeks a better image inside Earth

Aug 24, 2010

(PhysOrg.com) -- Scientists are installing underground seismographs across the US to glean better information about the Earth's interior, and Michigan Tech is deeply into it.

New way to track quakes

Sep 08, 2009

(PhysOrg.com) -- University of Edinburgh scientists have developed a new technique to monitor movements beneath the Earth's surface.

Deadly Mine 'Bump' was Recorded as Seismic Event

Aug 17, 2007

The University of Utah Seismograph Stations recorded a magnitude-1.6 seismic event at the time of a Thursday, Aug. 16 "bump" that killed and injured rescuers at a Utah coal mine where six miners were trapped by an Aug. 6 ...

Recommended for you

Scientists make strides in tsunami warning since 2004

Dec 19, 2014

The 2004 tsunami led to greater global cooperation and improved techniques for detecting waves that could reach faraway shores, even though scientists still cannot predict when an earthquake will strike.

Trade winds ventilate the tropical oceans

Dec 19, 2014

Long-term observations indicate that the oxygen minimum zones in the tropical oceans have expanded in recent decades. The reason is still unknown. Now scientists at the GEOMAR Helmholtz Centre for Ocean Research ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.