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Fig. 7.29 Earth
'
sseafloor crust age (red color corresponds to the most young crust) (Grankov 2011)
ocean. Along the ridge arch there is a system of deep longitudinal breaks (rifts), on all
extent it is crossed by cross-section (transform) faults. Tectonic activity of a ridge is
in a greater degree shown in its northern part. The most active area of display ancient,
modern, above-water, underwater and rift volcanism in the mid-Atlantic ridge are the
Azores (40
N). Hurricanes formed in area of the mid-Atlantic ridge are Emily, Delta,
tropical depression Ten, Lee, Maria and, probably, storm Unnamed.
The Antillo-Caribbean tectonic region, mostly consisting from small Caribbean
lithospheric plate, is a tectonic active area. Moreover, underwater and above-water
volcanism is active here. There is a complex zone of a transform fault
°
trench
Cayman, at the bottom of the western part of Caribbean Sea between Jamaica and
Cayman islands. It can be precisely established on Fig.
7.29
. It forms a part of
tectonic border between the North-American and Caribbean plates. The Cayman
Trough extends from northeast on a southwest, its maximal depth makes 7,686 m,
and it is the deepest point of Caribbean Sea. According to the received scheme, in
the region of this trough, two tropical depressions were generated: Arlene and
Wilma, last subsequently has developed in 5 category hurricane.
The Puerto Rico trench is located on border of Caribbean sea and Atlantic ocean,
almost along an island arch of Lesser Antilles. Carried out researches have con-
—
cant tsunami as a result of earthquakes
in this area. Volcanic activity mainly underwater type is observed along this island
arch to a southeast from Puerto Rico up to coast of South America. In this region,
according to the scheme, hurricanes Gamma and Dennis (hurricane of 4 categories)
have been formed.
firmed an opportunity of occurrence of signi
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