QuakeGuard is an AI-powered dual-use monitoring network combining seismic and acoustic sensors to detect vibrations, explosions, and underground activities in real time. Built on Raspberry Pi and Raspberry Shake technology, it fuses data at the edge and in the cloud using machine learning for event classification and geolocation. Designed for both civil and defense applications, QuakeGuard enhances border protection, critical infrastructure monitoring, and early-warning capabilities for natural or man-made events. Its modular architecture and low-cost hardware make it scalable, interoperable with ISR systems, and ideal for rapid deployment in smart sensing networks across Europe.