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Fletta eftir efnisorði "Jarðskjálftamælingar"

Fletta eftir efnisorði "Jarðskjálftamælingar"

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    Application of the POCS inversion method to cross‐borehole imaging 
    Bjarnason, Ingi Þorleifur; Menke, William (Society of Exploration Geophysicists, 1993-07)
    Cross-borehole tomography suffers from a well-known problem of data incompleteness: the limited ray coverage dictated by the poor experimental geometry implies that certain features of the velocity field are not determined by the data. Construction of ...
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    Contemporary tectonics of the Wasatch front region, Utah, from earthquake focal mechanisms 
    Bjarnason, Ingi Þorleifur; Pechmann, James C. (The Seismological Society of America, 1989)
    We have completed a comprehensive study of focal mechanisms of digitally recorded earthquakes (M, -_< 4.4) that occurred in the Wasatch front region in Utah during 1980 to 1986. Single-event solutions for 24 events were determined using recently ...
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    The effect of local wind on seismic noise near 1 Hz at the MELT site and in Iceland 
    Wilcock, William S. D.; Webb, Spahr C.; Bjarnason, Ingi Þorleifur (The Seismological Society of America, 1999)
    The mantle electromagnetic and tomography (MELT) experiment on the east Pacific rise near 17°S was the first large teleseismic experiment on a midocean ridge. During the six-month deployment, no compressional arrivals were well recorded above 0.5 ...
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    Hot mantle transition zone beneath Iceland and the adjacent Mid-Atlantic Ridge inferred from P-to-S conversions at the 410- and 660-km discontinuities 
    Shen, Yang; Solomon, Sean C.; Bjarnason, Ingi Þorleifur; Purdy, G. M. (American Geophysical Union (AGU), 1996-12-01)
    P‐to‐S conversions from the two primary discontinuities near 410 and 660 km depth (P410s and P660s phases) are evident in particle motions and receiver functions of teleseismic body waves recorded by broadband seismic stations in Iceland. The average ...
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    Jarðskjálftar á Íslandi árið 1953 
    Tryggvason, Eysteinn (Hið íslenzka náttúrufræðifélag, 1954)
    The seismic activity was relatively low in Iceland during this year. No large shock occurred, and no damage was done by earthquakes. The largest shock came on February 10th, with epicenter off the north coast (about 66°40'N, 17°0'W), origin time l ...
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    Jarðskjálftar á Íslandi árin 1956, 1957 og 1958 
    Tryggvason, Eysteinn (Hið íslenzka náttúrufræðifélag, 1959)
    During this period, three seismograph stations were operated in Iceland, at Reykjavík, Akureyri and Vík. A new seismograph station was erected at Kirkjubæjarklaustur (Síða) in 1958, where one vertical Willmore seismograph is operated. The seismic ...
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    Jarðskjálftar árin 1954 og 1955 
    Tryggvason, Eysteinn (Hið íslenzka náttúrufræðifélag, 1956)
    The seismograph station at Reykjavik was operated with three short period Sprengnether seismographs during these years. New stations were erected at Akureyri (65°40.3' N, 18°06.0' W) and at Vík (63°25.3' N, 19°01.0' W). At both these stations, one ...
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    Method to find the Minimum 1D Linear Gradient Model for Seismic Tomography 
    Smaglichenko, Tatyana A.; Bjarnason, Ingi Þorleifur; Smaglichenko, Alexander V.; Jacoby, Wolfgang R. (IOS Press, 2016-09-13)
    The changes in the state of a geophysical medium before a strong earthquake can be found by studying of 3D seismic velocity images constructed for consecutive time windows. A preliminary step is to see changes with time in a minimum 1D model. In this ...
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    Seismic evidence for a lower-mantle origin of the Iceland plume 
    Shen, Yang; Solomon, Sean C.; Bjarnason, Ingi Þorleifur; Wolfe, Cecily J. (Springer Nature, 1998-09)
    Iceland, one of the most thoroughly investigated hotspots1,2,3, is generally accepted to be the manifestation of an upwelling mantle plume4. Yet whether the plume originates from the lower mantle or from a convective instability at a thermal boundary ...
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    Single-Station Seismo-Acoustic Monitoring of Nyiragongo's Lava Lake Activity (D.R. Congo) 
    Barrière, Julien; d'Oreye, Nicolas; Oth, Adrien; Geirsson, Halldor; Mashagiro, Niche; Johnson, Jeffrey B.; Smets, Benoît; Samsonov, Sergey; Kervyn, François (Frontiers Media SA, 2018-06-19)
    Since its last effusive eruption in 2002, Nyiragongo has been an open-vent volcano characterized by the world’s largest persistent lava lake. This lava lake provides a unique opportunity to detect pressure change in the magmatic system by analyzing its ...
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    Temperature and melting of a ridge-centred plume with application to Iceland. Part II: Predictions for electromagnetic and seismic observables 
    Kreutzmann, A.; Schmeling, Harro; Junge, A.; Ruedas, T.; Marquart, G.; Bjarnason, Ingi Þorleifur (Oxford University Press (OUP), 2004-12)
    The dynamic and melting processes of a ridge-centred plume have been investigated in a companion paper by Ruedas et al. (hereafter referred to as Paper I) in a set of 3-D numerical fluid dynamic models with varying plume excess temperatures and melt ...