ABSTRACTS / RESUMES - Comitato Glaciologico Italiano

Classification of seismogravitational features. It is proposed
all seismodeformations to subdivide into the following types:
seismotectonic, seismogravitational, shaking-inducted,
seismohydrodynamic, seismodynamic and ejection ones. Seismogravitational
deformations are subdivided into 7 kinds.
Relation between different types of slope seismodeformations
and the intensity of responsible earthquakes. Slight
surface deformations in the soil are found due to shaking
of intensity IV-V or higher, considerable deformations in
the rocks due to intensity VI-VII or higher, and heavy relief
changes caused by intensity IX or higher.
The present study is based on field observations and published
data on earthquakes of the last about 100 years for
such mountain regions as Tien Shan, Pamirs, Kopet-Dag,
the Caucasus and the Crimea. For the Caucasus catalogues
of recorded seismogravitational disturbances for the historical
time period (late XIX-XX centuries) and for the older
past were compiled.
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IAVAD NIKZAD FARROKHI
Hydrogeology and hydrogeochemistry
of the Phlegrean Fields, Italy
Hydrogeologist, Tehran, Iran
The Phlegrean Fields geologically consists mainly of heterogeneous
pyroclastic products derived from the high explosive
volcanic activity which occurred in this area from
the Upper Pleistocene to historical times. The complex
stratigraphy permits, locally, the presence of layered water
tables; on large scale, however, they act as an only water table
because of little wideness of impermeable layer. As it
appears by piezometric morphology reconstruction the
Phlegrean Fields water table presents the following chief
features:
- ·it has a radial downward flow from central part onwards
where it reaches the top (26 m a.s.l.);
- it presents a drainage zone northward of Quarto, because
of the presence of high permeability lavas;
- it presents an anomalous high piezometric gradient in
the southern part.
In the same area, where occurs the piezometric gradient
increase, anomalous hydrogeochemical and piezometric
phenomena also occur: the Cl and Tds well water values
are relatively high and in the period 12/1985 - 11/1986 the
well water levels rose up.
All this should be caused by an upward water feed related
to an hydrothermal circuit which should make possible the
lift of the rich CI and Tds deep waters. The results of hydrologic
balance confirm this hypothesis.