The pre-Quaternary basement boundary is visible as the distinct and strong seismic reflector
at 155-165 ms TWT.
In the Swedish part the Cambrian sequence yields seven excellently correlating seismic reflectors
. The strongest reflectors Cm3 and Cm4 seemingly correspond to levels in the Nar Member and Grodingbo Siltstone, where the presence of seismic reflector
levels is indicated by lithological boundaries in the Gotska Sandon drill core (Figs 4, 5).
In the paleoceanographic application of seismic profiling we are not primarily concerned with the geometry of the layers; rather, we seek to associate a particular seismic reflector
(or group of reflectors) with a particular paleoclimatic or paleoceanographic event.
The region around this fault is apparently devoid of any major resistivity contrasts, and this is interpreted to mean that the fault, or a hydrothermal-alteration zone around the fault, is the seismic reflector
. This geologically significant fault brings older rocks, including some of the orebodies, over younger rocks and obtaining a geophysical image of it is of paramount importance.
It may be that the transition between slightly different metamorphic fabrics can generate a seismic reflector
"It's also irrelevant because Blake Plateau is not a Bahama channel." Austin counters that no one really knows whether or not the Bahama and Blake Plateau are distinct provinces, and even if they were, site 627 still showed that the seismic reflector
at the plateau--and, by inference, elsewhere--is made of shallow-water carbonates.
A normal moveout (NMO) correction is carried out to restore the nonzero offset seismic reflectors
to zero offset.
The research targets the method of seismic data processing and seismic data interpretation to delineate seismic reflectors
using 2-D seismic and well data.
The sequence R represents the most recent deposits (upper most sequence), and is characterized by variable and irregular seismic reflectors
. Besides, it is possible to recognize a series of volcanic highs that create structures in the Los Cayos Basin, for instance, the Quitasueno High, the Serrana and Roncador Islands (FIGURE 7).
Very strong and anomalous seismic amplitudes are also observed coincident with the reverse polarity seismic reflectors
. Excellent migration pathways are observed on the seismic data and seismic velocity reductions are associated with the prospects, indicating a reduction in density from the surrounding sediments.
Owing to their high density compared with crystalline rocks, massive sulphide ore bodies should be excellent seismic reflectors
. In contrast, attempts to image these ore bodies with reflection seismic have had limited success.
15 SCIENCE, Larry Mayer at Dalhousie University in Halifax, Nova Scotia, and his co-workers report that they used drill cores to link up and date a series of seismic reflectors
(the boundaries between layers of different rock types) across the central equatorial Pacific Ocean.