Physical Oceanography, Vol. 15, No. 6, 2005
ANALYSIS OF OBSERVATIONS AND METHODS FOR CALCULATING
HYDROPHYSICAL FIELDS IN THE OCEAN
SPECIFIC FEATURES OF THE PROPAGATION OF TSUNAMIS IN THE
NORTHWEST PART OF THE BLACK SEA
S. F. Dotsenko
We perform the numerical analysis of the propagation of tsunamis in the Black Sea from the
zones of seismic generation located to the south of the Crimea and in the northwest part of the
sea. It is shown that the tsunamis induced by earthquakes in the Crimean seismic zone are en-
trapped by the nearest part of the shelf and do not result in noticeable oscillations of level in the
northwest part of the sea. This enables us to explain the absence of manifestations of tsunamis in
1927, 1939, and 1966 near Odessa. The tsunami waves generated by earthquakes in the north-
west part of the sea are characterized by the directivity of their propagation. The wave height is
maximum in the areas corresponding to the north and east directions of propagation. Hence, the
north coast of the sea and the Kalamit Bay (Crimean Peninsula) are characterized by elevated
tsunami hazard for earthquakes occurring in the northwest part of the Black Sea.
More than twenty events of abnormal oscillations of the sea level that could be regarded as tsunamis were
detected in the Black Sea for the last 2000 years [1–3]. This phenomenon was observed practically along the
entire coast of the Black Sea and caused both by seaquakes and earthquakes. For the four events observed in the
20th century, the instrumental data on the parameters of tsunami waves were accumulated along the sea coast
and then generalized in [4, 5].
In the northwest part of the Black Sea, tsunamis were recorded relatively rarely and the echoes of instru-
mentally recorded tsunamis were not detected in this region. In what follows, to study weak manifestations of
the Black-Sea tsunamis in the investigated region, we perform the numerical analysis of propagation of long
waves in the northwest part of the Black Sea. We study the waves emitted from remote and close origins of
tsunami waves of elliptic shape located to the south of the Crimean Peninsula and over the drop of depths in the
northwest part of the sea, respectively. The two-dimensional propagation of waves in the Black-Sea basin was
earlier studied within the framework of linear and nonlinear models in [2, 6, 7].
Mathematical Model of Prediction of Tsunamis
To describe the space structure of tsunamis in the Black-Sea basin, we use the evolutionary model of long
surface waves. Since the depth of the analyzed regions of the sea is always greater than
we can restrict
ourselves to the linear approximation. The response of the liquid to an underwater seaquake is modeled by an
initial disturbance in the form of a displacement of the free surface of liquid for the trivial velocity field.
Marine Hydrophysical Institute, Ukrainian Academy of Sciences, Sevastopol.
Translated from Morskoi Gidrofizicheskii Zhurnal, No.
46–53, November–December, 2005. Original article submitted Septem-
ber 20, 2004.
0928-5105/05/1506–0363 © 2005 Springer Science+Business Media, Inc. 363