0 relating to or caused by an earthquake: --
1 relating to, or caused by an earthquake (= sudden violent movement of the earth’s surface) --
The crater is not exposed at the surface, but is seen in seismic data and a number of drill cores.
Here, an accumulated reservoir of magma is observed as a region of anomalously low seismic velocities.
A few more words on seismic resolution and its physical basis would not have come amiss.
More could usefully have been included on the use of seismic to determine rock properties and of sequence stratigraphy to define source/reservoir/seal configurations.
Each structure is very well illustrated, usually with more than one seismic profile as well as a map and occasionally potential field data.
Since then a significant body of knowledge on the nature of subsurface sediments has progressively emerged, first from piston cores and later from seismic lines.
In a series of papers, forming much of the book, the problem of characterizing fractures from well data, seismic, and regional geological studies is discussed.
The transition from upper to lower crust is here defined as the depth level where seismic velocities exceed 6.5 km/s.
