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  • 1
    Electronic Resource
    Electronic Resource
    Rupture process of the Ito–Oki, Japan, earthquake of 1989 July 9 and interpretation as a trigger of volcanic eruption (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 109 (1992), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The rupture process of the Ito–Oki, Japan, earthquake (MJ 5.5) of 1989 July 9 was studied in detail by waveform inversion, and the relation between this earthquake and the July 13 volcanic eruption on the Teishi Knoll near the epicentre was discussed. We used strong motion seismograms recorded at near-field stations operated by the Earthquake Research Institute and the Japan Meteorological Agency. The inversion method for estimating spatial and temporal slip distribution is essentially the same as that of Yoshida & Koketsu (1990). The estimated fault model showed that large slip occurred in the epicentral area extending eastward for about 1 km at a depth of 5 km. We calculated the volumetric strain change due to the estimated slip and found that a remarkable pressure drop occurred just under the Teishi Knoll. A model of volcanic eruption by Ida (1990) suggests that such a pressure drop in a magma reservoir causes vesiculation of dissolved volatiles in the magma and leads to magma ascent toward a surface eruption. We attempted to quantitatively explain the process of the Teishi Knoll eruption in terms of Ida's model considering the Ito–Oki earthquake to be a trigger of the eruption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1992.tb00095.x
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  • 2
    Electronic Resource
    Electronic Resource
    Simultaneous inversion of waveform and geodetic data for the rupture process of the 1984 Naganoken–Seibu, Japan, earthquake (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 103 (1990), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A simultaneous inversion method of strong motion seismograms and geodetic data for inferring earthquake rupture process was developed. We assumed a source model composed of many point-sources of which slip vectors and rupture times are unknown parameters. In addition to observed data, we introduced smoothing constraints to determine many parameters without instability. Since the least-squares solution depends on the relative weights of the smoothing constraints to a data misfit function, we determined their values by minimizing Akaike's Bayesian information criterion (ABIC). By using ABIC, we can objectively choose a unique model.This inversion method was applied to the Naganoken–Seibu, Japan, earthquake of 1984. Dividing a 15 times 10 km fault into 150 subfaults, we obtained the minimum ABIC model with a seismic moment of 2.7 times 1025 dyne cm. This model has a slip peak in the eastern and shallow area of the assumed fault. The high slip area is just under the areas where thrown-out boulders were found by Umeda et al. (1987) and Iio & Yoshioka (1988). Comparing the aftershock distribution with the estimated slip distribution, we found that the high slip area had few aftershocks. This suggests that aftershocks are caused by the stress generated in the marginal region around the main shock slip. The inversion analysis also revealed that there was a slight change in slip angle during the earthquake. The high slip area has some amount of dip–slip component while the slips in the other areas are almost purely right-lateral.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1990.tb01776.x
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  • 3
    Electronic Resource
    Electronic Resource
    Die swell of liquid crystal-forming solutions of hydroxypropyl cellulose through a long capillary die (1995)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 226 (1995), S. 89-99 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Strangaufweitung und die Scherviskosität von lyotrop flüssigkristallinen Lösungen von Hydroxypropylcellulose in N,N-Dimethylacetamid wurden in einem relativ breiten Scherspannungs- und Konzentrationsbereich bei 30°C mit einer langen Kapillardüse mit einem Achsenverhältnis von 114 gemessen. Die Strangaufweitung hängt in ähnlicher Weise von der Konzentration ab wie die Scherviskosität; sie zeigt ein Maximum bei einer kritischen Konzentration Ca und ein Minimum bei einer weiteren kritischen Konzentration Cb, wobei Ca 〈 Cb. Die Abhängigkeit der Strangaufweitung von der Scherspannung wird stark von der Zahl der Phasen der Lösung bestimmt: Im isotropen Bereich unterhalb Ca nimmt die Strangaufweitung mit der Scherspannung monoton zu; nahe Ca durchläft sie ein Maximum; in einem zweiphasigen Bereich zwischen Ca und Cb nimmt sie wieder ab und durchläuft im einphasig-isotropen Bereich oberhalb Cb ein Minimum, wobei eine oberhalb Cb auftretende Distorsion des Extrudats im Bereich des Minimums verschwindet.
    Notes: The die swell and shear viscosity of lyotropic liquid crystal-forming hydroxypropyl cellulose solutions in N,N-dimethylacetamide were determined over a relatively wide range of shear stress or polymer concentration at 30°C by using a long capillary die with an aspect ratio of 114. The dependence of die swell on the concentration was similar to that of shear viscosity: a maximum at a critical concentration Ca and a minimum at another critical concentration Cb (Ca 〈 Cb). The dependence of the swell on shear stress is greatly affected by the solution phase: in an isotropic range (below Ca), the die swell increased monotonously with shear; in the vicinity of Ca, the die swell exhibited a maximum; in a biphasic range (between Ca and Cb), the die swell decreased monotonously; in a single-phase anisotropic range (above Cb), the die swell exhibited a minimum. Above Cb, extrudate distortion was observed and disappeared around the shear where the die swell exhibited a minimum.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1995.052260109
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