DEVICE FOR REGISTERING AND EARLY WARNING OF UNDERWATER EARTHQUAKES AND TSUNAMIS

摘要

The device is used in operative oceanography for environment and population protection from calamities, in particular for early warning of tsunamis danger. It represents a system of pressure transducers (9), seawater temperature pick-ups (6), seawater salinity transducers (7), and a seismic sensor (5Æ), all they being arranged in the interior of a body (1) catching the natural underwater springs,as well as a sea level transducer and a seismic sensor (5) positioned on a block at the sea bottom. The signals from the above sensing devices are fed to a coast registration station (20) through a disconnecting box (8) of a cable hose (11), the caught gas being fed along the hose to the coast, where the hose is provided with a valve (13), a one-way valve (14), a pressure transducer (15) a flow meter with an electronic terminal, and still another valve whose output (22) is connected to a respective reservoir (gasholder). The signals from the transducers (5, 5Æ, 6, 7 and 9) and those from the pressure transducer (15), the flow meter and the underground-water level gauge (23) are fed along the respective cable cores to the measuring and commutating unit (16) connected to an analogue-to-digital converter (17), the output of the latter being connected to the input of a computer (18) controlled by an input-output unit (19). In case of registration of increased gas flow and pressure, changes in the underground-water level, higher sea level, or a pick from the seismic sensors, a signal is given which, through coordination and correlation with the signals received in the national seismological network, warns of underwater earthquakes or tsunamis danger.