. Lough, Amanda C.; Barcheck, C. Grace; Wiens, Douglas A.; Nyblade, Andrew; Anandakrishnan, Sridhar 2015-11-01 We identify a unique type of seismic source in the uppermost part of the East Antarctic Ice Sheet recorded by temporary broadband seismic arrays in East Antarctica. These sources, termed 'firnquakes,' are characterized by dispersed surface wave trains with frequencies of 1-10 Hz detectable at distances up to 1000 km. Events show strong dispersed Rayleigh wave trains and an absence of observable body wave arrivals; most events also show weaker Love waves. Dell axim x5 manual. Initial events were discovered by standard detection schemes; additional events were then detected with a correlation scanner using the initial arrivals as templates. We locate sources by determining the L2 misfit for a grid of potential source locations using Rayleigh wave arrival times and polarization directions.
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We then perform a multiple-filter analysis to calculate the Rayleigh wave group velocity dispersion and invert the group velocity for shear velocity structure. The resulting velocity structure is used as an input model to calculate synthetic seismograms. Inverting the dispersion curves yields ice velocity structures consistent with a low-velocity firn layer 100 m thick and show that velocity structure is laterally variable. The absence of observable body wave phases and the relative amplitudes of Rayleigh waves and noise constrain the source depth to be less than 20 m. The presence of Love waves for most events suggests the source is not isotropic. We propose the events are linked to the formation of small crevasses in the firn, and several events correlate with shallow crevasse fields mapped in satellite imagery. TRICKY AND GRAY, TWO HORSES HELD BY UNIDENTIFIED AFRICAN-AMERICAN SOLDIERS, POST IN 1939 (FORT HUACHUCA HISTORICAL MUSEUM, PHOTOGRAPH 1939.00.00.06, PHOTOGRAPHER UNIDENTIFIED, CREATED BY AND PROPERTY OF THE UNITED STATES ARMY) - Fort Huachuca, Cavalry Stables, Clarkson Road, Sierra Vista, Cochise County, AZ.
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Ryan, John F; Hovde, Rachel; Glanville, Jacob; Lyu, Shu-Chen; Ji, Xuhuai; Gupta, Sheena; Tibshi.