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Automated security system for valued physical assets such as large equipment and physical facilities, critical infrastructure such as power stations, utility plants, pipelines, and nuclear power plants, and perimeters, such as international borders and other boundaries vulnerable to intrusion. The system comprises multiple in-ground vibration sensors arranged in one or more compact array configurations and monitoring hardware and software for acquisition, processing, and analysis of prespecified ground vibration source data including classification of detected vibration source types, source location information, and system state of health