9:45 AM - 10:00 AM
[SCG62-15] Precise observation of migration of non-volcanic low frequency tremors by using dense seismic array
Keywords:non-volcanic low frequency tremor, seismic array, Kii Peninsula
A sensitivity of the NVTs detection by using the seismic array is higher than a conventional envelope cross-correlation method. However, the detection capability decreases, when the NVTs occurs roundly, as same as the case of the envelope cross-correlation method [Takeda et al., JpGU, 2014]. Furthermore, the location accuracy is influenced by a distance and a velocity structure between the NVTs hypocenter and the array.
Our observation infers that all the fastest NVTs migration around the array (within 25 km of epicentral distance) is in the almost same direction during these three and half years. The migration direction is almost parallel to the slip of the subducting plate, while some of events migrate in different directions. Furthermore, in some case, the direction changed temporary in the same event.
To confirm a relation between these differences of migration directions and the detailed location of NVTs is future work.