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A Relative Moment Tensor Inversion Scheme for Local Earthquakes: Application to San Juan Cluster

Description: 

The relative abundance of small earthquakes renders them potentially useful tools in improved understanding of regional seismotectonics; however, determination of moment tensors (MTs) for such events recorded on regional networks is complicated by low signal-to-noise ratios, sparse station sampling and complex wave propagation at short periods. We build upon previous work in designing a multiple-event, simultaneous moment tensor inversion scheme for small earthquakes that employs constraints from P-wave polarities and relative amplitudes of direct P and S-waves recorded at common stations. The scheme exploits the principal component decomposition of clustered-event waveforms to derive high-fidelity measures of the aforementioned quantities. I will demonstrate the approach on a seismic cluster near San Juan Island, ~70 km south of Vancouver.

Session: Earthquake Source Parameters: Theory, Observations and Interpretations [Poster]

Type: Poster

Date: 4/18/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Doriane Drolet

Student Presenter: Yes

Invited Presentation: 

Authors