排序方式: 共有45条查询结果,搜索用时 109 毫秒
41.
Onur Tan Eleftheria E. Papadimitriou Zumer Pabucçu Vassilis Karakostas Ahmet Yörük Kostas Leptokaropoulos 《Acta Geophysica》2014,62(6):1283-1309
A detailed investigation of microseismicity and fault plane solutions are used to determine the current tectonic activity of the prominent zone of seismicity near Samos Island and Kusadasi Bay. The activation of fault populations in this complex strike-slip and normal faulting system was investigated by using several thousand accurate earthquake locations obtained by applying a double-difference location method and waveform cross-correlation, appropriate for areas with relatively small seismogenic structures. The fault plane solutions, determined by both moment tensor waveform inversions and P-wave first motion polarities, reveal a clear NS trending extension direction, for strike slip, oblique normal and normal faults. The geometry of each segment is quite simple and indicates planar dislocations gently dipping with an average dip of 40–45°, maintaining a constant dip through the entire seismogenic layer, down to 15 km depth. 相似文献
42.
The paper discusses the seabed shear stresses under random waves, and compares model predictions with results from field measurements near the seabed in the Strait of Juan de Fuca, Washington State, and at EDDA, North Sea. The model predictions as well as the interpretation of data are based on three different representative measures of random wave velocities within 12 minute records: root-mean-square, significant and maximum values. From the two locations the best agreement is found for the Strait of Juan de Fuca data regardless of the random velocity measure used. This agreement is attributed to the absence of suspended sediment at this location. 相似文献
43.
Kostas Glampedakis Lars Samuelsson Nils Andersson 《Astrophysics and Space Science》2007,308(1-4):607-611
The presence of a magnetic field in a neutron star interior results in a dynamical coupling between the fluid core and the
elastic crust. We consider a simple toy-model where this coupling is taken into account and compute the system’s mode oscillations.
Our results suggest that the notion of pure torsional crust modes is not useful for the coupled system, instead all modes
excite Alfvén waves in the core. However, we also show that among a rich spectrum of global MHD modes the ones most likely
to be excited by a fractured crust are those for which the crust and the core oscillate in concert. For our simple model,
the frequencies of these modes are similar to the “pure crustal” frequencies. We advocate the significant implications of
these results for the attempted theoretical interpretation of QPOs during magnetar flares in terms of neutron star oscillations.
相似文献
44.
Nils Andersson & Kostas D. Kokkotas 《Monthly notices of the Royal Astronomical Society》1998,299(4):1059-1068
We present new results for pulsating neutron stars. We have calculated the eigenfrequencies of the modes that one would expect to be the most important gravitational wave sources: the fundamental fluid f mode, the first pressure p mode and the first gravitational wave w mode, for twelve realistic equations of state. From these numerical data we have inferred a set of 'empirical relations' between the mode frequencies and the parameters of the star (the radius R and the mass M ). Some of these relations prove to be surprisingly robust, and we show how they can be used to extract the details of the star from observed modes. The results indicate that, should the various pulsation modes be detected by the new generation of gravitational wave detectors that come online in a few years, the mass and the radius of neutron stars can be deduced with errors no larger than a few per cent. 相似文献