S wave velocity inversion through Rayleigh wave dispersive curve

In June, 2018, Researchers from Jilin University got the S wave velocity from Rayleigh wave dispersive curve with 2 hours’ observation data, acquired by 10 IGU-16 1C (5 Hz) stations. The velocity curve is consistent with the logging data.

Layers indicated by S wave velocity (red curve) inversed from surface wave of ambient noise data (SPAC method) can be verified by the logging data. (Tian You, 2018)

Natural earthquake observation

In XinJiang, China, researchers from Institute of geology and geophysics of CAS deployed 50 pieces of IGU 3C 5-Hz along a 25 km long survey line to study the crustal thickness with receiver functions through earthquakes of large epicentral distance. The station interval was 500-m, which is denser than arrays using for this kind of study.

A number of earthquakes with magnitude above Mw 6.0 from Japan and Indonesia have been recorded. The signal has high SNR with the main frequency around 2 Hz.

Station survey Map

The vertical component data applied with low pass filter with corner frequency 10 Hz. The magnitude 6.5 earthquake occurred in Indonesian at 15:35:01, Aug 17th, 2018.The epicentral distance is about 6500 km.

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