Abstract: A vibration sensor for construction projects has a housing, a low range accelerometer and a high range accelerometer disposed in the housing, and an analog-to-digital conversion circuit connected to the low and high range accelerometers. The low range accelerometer may have a noise floor below 0.0248 g across frequencies up to 1 kHz, especially between 1 Hz and 315 Hz. The high range accelerometer has a maximum acceleration equal to or greater than 50 g across frequencies up to 1 kHz, especially between 1 Hz and 315 Hz.

Abstract: A vibration sensor for construction projects has a housing, a low range accelerometer and a high range accelerometer disposed in the housing, and an analog-to-digital conversion circuit connected to the low and high range accelerometers. The low range accelerometer may have a noise floor below 0.0248 g across frequencies up to 1 kHz, especially between 1 Hz and 315 Hz.The high range accelerometer has a maximum acceleration equal to or greater than 50 g across frequencies up to 1 kHz, especially between 1 Hz and 315 Hz.

Abstract: A vibration monitoring system with vibration sensors, a computer system connected to the vibration sensors, and a display connected to the computer system. The computer system gathers data from the vibration sensors and compares the gathered data to a first threshold. The display shows a first list of events where the gathered data exceed the first threshold. The computer system has a local computer connected to the vibration sensors, and a central monitoring station and/or a user computer connected to the local computer. The central monitoring station and/or the user computer is connected to the local computer via the Internet.

Abstract: A vibration detection system with first and second vibration sensor assemblies. The first vibration sensor assembly is installed at a first depth below a ground surface. The second vibration sensor assembly is installed relative to the first vibration sensor assembly at a horizontal distance away from the first vibration sensor assembly and/or at a second depth below the ground surface, where the second depth is different than the first depth. The first and second vibration sensor assemblies are connected to at least one data logger, which is connected to a computer system. The computer system can calculate a location of a vibration source based on data received from the data logger.