Abstract: A system for storing potential energy includes a hydraulic cylinder, a mass to be lifted, and a sealing ring at the edge of the mass to be lifted. The mass to be lifted is a solid rock mass in the form of a cut-out solid rock. The hydraulic cylinder is formed by the cavity between surrounding rocks and the cut-out solid rock. The cavity is sealed with respect to the surrounding rocks by the sealing ring. A method for producing such a system is also provided.

Abstract: A system for storing potential energy includes a hydraulic cylinder, a mass to be lifted, and a sealing ring at the edge of the mass to be lifted. The mass to be lifted is a solid rock mass in the form of a cut-out solid rock. The hydraulic cylinder is formed by the cavity between surrounding rocks and the cut-out solid rock. The cavity is sealed with respect to the surrounding rocks by the sealing ring. A method for producing such a system is also provided.

Abstract: The invention relates to a tsunami alarm system that integrates information from seismic measurement stations or tsunami warning stations by applying the data collection procedures of the warning detection and consolidation station 30. In conjunction with the warning assessment and alarm station 40 the system decides by its alarm logic, whether an alarm is raised. Alarms are distributed by the distribution list manager 50 via the mobile telephony network operators 60 to the mobile devices and mobile telephones 70 of the participating people. The pervasion application 80, which resides on the mobile telephone or mobile device, increases the likelihood that alarms are not overheard and hence get noticed. In this way the invention enables people to take preventive action many minutes before the devastating tsunami arrives. Further, the invention relates to a method for providing tsunami warning messages and a computer program for processing said method.