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A satellite-based communication system is introduced to give early warning of tsunamis and earthquake by direct measurement of tsunamis in the open ocean and s-waves followed by real-time reporting to warning centers. This alert system for tsunami and earthquakes transmits their magnitude values to a central place via satellite communication to deliver alert signals. The tsunami alarm system consists of bottom pressure recorder (BPR) that can record seismic waves followed by tsunami waves and transfer this data to the warning dissemination centre through satellite communication media. The earthquake alarm system consists of reporting terminal which is very similar to the tsunami reporting terminal, except that an accelerometer is used in place of the Bottom pressure recorder. After receiving warning a prerecorded or instantly-recorded, siren appended with voice/text messages is transmitted to the warning receivers, placed in different locations, using a common satellite channel.
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