Fig. 5.

Example MHVSRs obtained during microtremor array acquisition at multiple locations (various array radius) from each array’s sensor. a On flat ground in Vancouver, the MHVSR peak is consistent (1.5 Hz) amongst all tested locations and indicates laterally homogeneous site geology (depth to significant impedance or resonator is consistent). A second higher frequency peak shifts in frequency (5–20 Hz) and broadness indicating variable depth and possibly geometry of near-surface resonator. b On sloping ground in Port Coquitlam, multiple narrow peak resonances are observed (broad to flat peak occurs when these narrow resonances have similar amplification) amongst all tested locations and indicates rapidly changing depth to significant impedance contrast (resonator) or a laterally heterogeneous site geology