Method and device for determining moment magnitude of microseism event

The invention discloses a method and device for determining the moment magnitude of a microseism event, and the method comprises the steps: carrying out the Fourier transform of longitudinal and transverse waves collected by a detector, and determining the main frequency of the microseism event; determining a propagation path and propagation duration of the microseism event according to the time difference data of the longitudinal and transverse waves acquired by the detector; according to the maximum amplitude value of the longitudinal and transverse waves collected by the detector, the mainfrequency of the microseism event and the propagation duration of the microseism event, determining the maximum amplitude value of the longitudinal and transverse waves at the rock fracture position of the microseism event; determining the seismic moment of the microseism event according to the maximum amplitude value of the longitudinal and transverse waves at the rock fracture position of the microseism event, the propa