Fig.1 shows the relation between the BNS sensitivity that is sensitive to the displacement and peaks around 100Hz and the recent seismic noise enhancement around 200mHz(Microseismic noise: PEM-SEIS_MCF_GND_X_BLRM_100MHZ300) due to a typhoon, etc.

Two enhancements denoted by dotted time lines appear to be related to each other, even though the frequency bands are different with each other. This is also one of nolinear effect?