Seismic reflection coefficients from mantle fault zones
نویسندگان
چکیده
منابع مشابه
Seismic Measurements of the Internal Properties of Fault Zones
-The internal properties within and adjacent to fault zones are reviewed, principally on the basis of laboratory, borehole, and seismic refraction and reflection data. The deformation of rocks by faulting ranges from intragrain microcracking to severe alteration. Saturated microcracked and mildly fractured rocks do not exhibit a significant reduction in velocity, but, from borehole measurements...
متن کاملContinent-sized anomalous zones with low seismic velocity at the base of Earth's mantle
481 The movement of Earth’s tectonic plates, which includes divergence at mid-ocean ridges to create new crust and lithosphere, as well as convergence and consumption of older plates into Earth’s interior at subduction zones, is related to convective motions of the underlying mantle rock over geologic timescales. The mantle, which extends to about 2,900 km depth, just less than halfway to Earth...
متن کاملReflected and transmitted waves from fault zones
Waves reflected from and transmitted across fault zones can be used to extract information on those zones. Fault zones, characterized as either a low-velocity zone or fracture systems, modify the phase of the waveform and make the seismic response frequency dependent. In this paper we develop an extrapolation scheme for simulating fractures described as linear slip boundaries. Two 9 × 9 linear ...
متن کاملMantle dynamics and seismic anisotropy
a r t i c l e i n f o Keywords: seismic anisotropy mantle flow geodynamic modeling shear wave splitting surface wave analysis mantle convection Observations of seismic anisotropy yield some of the most direct constraints available on both past and present-day deformation in the Earth's mantle. Insight into the character of mantle flow can also be gained from the geodynamical modeling of mantle ...
متن کاملCharacterization of Fault Zones
There are currently three major competing views on the nature of earthquake fault zones. The first is that faults are (possibly segmented and heterogeneous) Euclidean zones in a continuum solid. The second focuses on granular aspects of faults and deformation fields. The third is that faults are fundamentally rough fractal objects at all relevant scales. The existing data can not distinguish un...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1987
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.1987.tb04412.x