KAGRA is the 2nd generation gravitational wave detector in Japan. There are two unique features in KAGRA detector, one is the underground environment and another is the cryogenics. Those two features would be the essential technique toward the next generation detector.
Toward the observation, we installed various environmental monitors such as accelerometers, magnetometers, seismometers, microphones, temperature and humidity monitors, air pressure monitors, voltage monitors and so on. In addition to this, we established the portable environmental monitoring system for detector noise hunting. Those environmental monitors are also used for the R&D studies for the future gravitational wave detectors..
In this talk, we will present the investigation of the environmental noise at KAGRA detector and current status of the noise hunting using environmental monitors.