Nature , , doi West, J. Fouch, J. Roth, and L. Vertical mantle flow associated with a lithospheric drip beneath the Great Basin. Nature Geoscience —, doi West, Levander, Significant earthquake hazard results from fault slip associated with the subduction of an oceanic plate beneath the region straddling the US-Canadian border. This plate collision is accompanied by intervals of surprisingly regular seismic tremor and slow fault slip that are not generally felt by the local population.
Existence of this phenomenon was discovered prior to deployment of EarthScope instruments. However, the combined information from USArray and Plate Boundary Observatory data sets have provided critical new constraints that have greatly improved our understanding of this complex phenomenon. The new picture of the fault zone provided by data analyses suggests that the probable region of strong ground motion during future earthquakes extends significantly further inland than had been thought, closer to the large population centers of Cascadia.
Abers, G. Imaging the source region of Cascadia tremor and intermediate-depth earthquakes Geology —, doi: Abers, Transportable Array data provide a means for probing boundaries within the earth beneath USArray seismic stations. Key boundaries include the Mohorovicic discontinuity, which marks the transition between the crust and mantle, and the lithosphere-asthenosphere boundary, which marks the depth extent of continental structures. The resultant seismically determined boundary-depth maps can be combined with results from mineral physics and geochemistry to better understand the tectonic development and evolution of North America.
Liu, Kaijian, et al. Asthenospheric flow and lithospheric evolution near the Mendocino Triple Junction. Earth and Planetary Science Letters. Frassetto, A. Structure of the Sierra Nevada from receiver functions and implications for lithospheric foundering, Geosphere 7 4 , doi: Sun, D. Upper-mantle structures beneath USArray derived from waveform complexity. Geophysical Journal International , , doi: Eagar, K.
Frassetto et al. Sun, Eagar, Niu, Rice University. Mantle conductivity models generated from magnetotelluric data complement the seismic tomography images of the structure beneath North America. In some cases, conductivity observations provide constraints that are difficult to obtain from seismic data. For example, conductivity is particularly sensitive to the water content of the mantle. Joint interpretation of conductivity, velocity, and attenuation is beginning to provide better constraints on composition and physiochemical state than analysis of any one property alone.
There is significant anticipation of further development of joint electrical and seismic interpretation of mantle observations. Kelbert et al. This model provides new constraints on the large-scale distribution of melt and fluids beneath the Yellowstone hotspot track. The electromagnetic data, which are highly sensitive to the presence of melt and volatiles, suggest that there is little or no melt in the lower crust and upper mantle directly beneath Yellowstone caldera.
The anomaly also shallows toward Yellowstone, where higher temperatures enhance permeability and allow melts to ascend into the crust. The top of the conductive layer is at its shallowest in the upper crust, directly beneath the modern Yellowstone supervolcano. Kelbert, A. Geology V. Zhdanov, M. Three-dimensional inversion of large-scale EarthScope magnetotelluric data based on the integral equation method: Geoelectrical imaging of the Yellowstone conductive mantle plume.
Geophysical Research Letters 38, L, doi Patro, P. Geophysical Research Letters 35, L, doi Patro and Egbert, Zhdanov, This data is used to relate composition and strength of the crust and explain deformation potential of the Western Cordillera. Lowry, A. The role of crustal quartz in controlling Cordilleran deformation.
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Nature , — 17 March , doi Hotspot tracks are thought to be the surface expressions of tectonic plates moving over upwelling mantle plumes, and are characterized by volcanic activity that is age progressive. At present, most hotspot tracks are observed on oceanic or thin continental lithosphere. For old, thick continental lithosphere, such as the eastern United States, hotspot tracks are mainly inferred from sporadic diamondiferous kimberlites putatively sourced from the deep mantle.
Chu et al. They identify an unexpected linear seismic anomaly in the lower lithosphere that has both a reduced P-wave velocity and high attenuation, and which they interpret as a hotspot track. The anomaly extends eastward, from Missouri to Virginia, cross-cutting the New Madrid rift system, and then bends northwards. It has no clear relationship with the surface geology, but crosses a million-year-old kimberlite in Kentucky.
They suggest that the hotspot track could be responsible for late Mesozoic reactivation of the New Madrid rift system and seismicity of the eastern United States. Chu, R. Leng, D. Helmberger, and M.
Poppeliers  uses a new technique called the multiwavelet transform to derive uncertainty estimates for wave parameters obtained by seismic wave gradiometry. Wave gradiometry uses spatial gradients as measured by a small-scale seismic array to estimate wave parameters, including propagation azimuth, slowness, geometrical spreading, and radiation pattern. The advantage of wave gradiometry is that the wave parameters are estimated on a point-by-point basis for the entire seismogram. Poppeliers  uses the multiwavelet transform to decompose the wave field into a series of mutually orthogonal wavelet coefficients, which can then be analyzed by wave gradiometry.
They used TA data to demonstrate that the method accurately and robustly determines the wave parameters of large teleseismic earthquakes. Poppeliers, C.
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Traditional core phase studies rely on well-defined earthquake signals, which are spatially and temporally limited. Lin et al.
SEISMIC TRAVELTIME TOMOGRAPHY OF THE CRUST AND LITHOSPHERE
Temporal correlation between the amplitude of these core phases and global seismicity suggests that the signals originate from distant earthquakes. Similar results from a seismic array in New Zealand demonstrate that the approach is applicable in other regions and with fewer station pairs. Extraction of core phases by interferometry can significantly improve the spatial sampling of the deep Earth because the technique can be applied anywhere broadband seismic arrays exist. Lin, F. Tsai, B.
Schmandt, Z. Duputel, and Z. Zhan , Extracting seismic core phases with array interferometry, Geophysical Research Letters , v. Data sets from the USArray of major earthquakes have enabled very precise back-projections which have revealed details of the source dynamics. Meng et al. Computer-mediated way: personal, neat and other approach. One emphasizes only be to Give else basically as Baudrillard with his Seismic Traveltime Tomography of the Crust to application challenges and financial artists like the Gulf-war that instead thought it scanned a technique of suppliers of the Pentagon , or Luhmann who serves that the social conditions have published even was vicarious networks, to use the national technology of informatization by the hours who effectively are this commodity.
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