A computer-implemented system for nearfield gunshot and explosion detection comprising a hardware device with a differential air pressure sensor, a pressure amplifier that amplifies pressure signals generated by the differential air pressure sensor, a microphone, a microphone amplifier that amplifies audio signals generated by the microphone, and a pulse counter that calculates a total event length. The system includes a digital processor that processes the amplified signals from the differential air pressure sensor and the microphone and a data radio that generates alerts based on input from the differential air pressure sensor and the microphone. The system determines whether a gunshot event or an explosive event has occurred based on a pressure length sensitivity setting, a microphone length sensitivity setting, and a correlation sensitivity setting.