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on temporary sites that marched across the conterminous United States. The initial deployment, in August 2007, was in the western quarter of the United States. Since then the stations on the western edge were regularly relocated to the eastern edge at a rate of about four stations per week. The
106:. The density of the TA network — typical station spacing of about 70 km — provided a level of resolution not previously available in many parts of the country and provided finer details of the
250:; Zeitler, Peter; Levander, Alan; Humphreys, Gene; Karlstrom, Karl; Ekström, Goran; Carlson, Rick; Dixon, Tim; Gurnis, Michael; Shearer, Peter; van der Hilst, Rob (November 1999).
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observations made on the Earth's surface to help determine the geologic history of North
America, as well as to better understand that geologic processes that are at work today.
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was an additional 100+ permanent stations located on approximately 300 km spacings that provided a long-term reference frame. These also augmented the USGS
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Transportable Array reached the East Coast in 2013, and wound up in 2017, having occupied nearly 2000 sites. An archive of stations are listed online.
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Geological structures can be mapped by observing how they affect seismic waves from local and distant earthquakes, a process known as
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was a pool of portable seismic instruments available for short-term high-density observations of particular areas of interest.
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Facility Data
Services, operated by EarthScope Consortium (previously known as the IRIS Data Management Center).
35:
27:
208:
Kerr, Richard (14 June 2013). "Geophysical
Exploration Linking Deep Earth and Backyard Geology".
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measured naturally occurring electric and magnetic fields. It consisted of seven permanent
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128:(ANSS), providing seismic observations in areas where instrumentation had been lacking.
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US earth science project collecting seismic images of the North
American lithosphere
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50:, with contributions from several other national and international organizations.
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22:(Seismic and Magnetotelluric Observatory) was one of the three components of the
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and were constructed, operated, and maintained as a collaborative effort with
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Seismological observatories, organisations and projects
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Data from these instruments are available from the NSF
61:. The data collected from USArray was integrated with
94:(TA) was a network of 400 high-quality broadband
44:Incorporated Research Institutions for Seismology
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53:A major goal of USArray was to collect detailed
139:(MT) stations and twenty portable stations.
26:project, the other two components being the
34:(SAFOD). The components were funded by the
73:USArray consists of four "observatories":
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32:San Andreas Fault Observatory at Depth
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126:Advanced National Seismic System
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110:under parts of North America.
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222:10.1126/science.340.6138.1283
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57:images of the North American
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36:National Science Foundation
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86:the Magnetotelluric Array.
28:Plate Boundary Observatory
77:the Transportable Array.
161:Array Network Facility
83:the Reference Network.
133:Magnetotelluric Array
252:"USArray Initiative"
92:Transportable Array
69:Arrays and Networks
48:Stanford University
104:seismic tomography
80:the Flexible Array
122:Reference Network
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248:Rudnick, Roberta
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143:Data Management
137:magnetotelluric
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191:. Retrieved
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96:seismographs
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46:(IRIS), and
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188:Usarray.org
108:lithosphere
59:lithosphere
167:References
24:Earthscope
259:GSA Today
193:14 August
184:"USArray"
273:Category
230:23766309
155:See also
63:geologic
210:Science
55:seismic
20:USArray
228:
42:, the
40:UNAVCO
255:(PDF)
226:PMID
195:2018
149:SAGE
131:The
120:The
113:The
90:The
218:doi
214:340
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