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Very-Low-Frequency Earthquakes (VLFE) in SVI and Grid Moment-Tensor Inversion
For details on GCMT inversion method, see Ito et al., GJI, 2006.
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Forward Modelling of VLFE Waveforms
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An Example of VLFE in May 2008 ETS Episode
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Compare to A Recent Study by UW Group
La Rocca et al. (Science, 2009)
Kao et al. (JGR, special issue)
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PGC Array: ~200 m Spacing
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Spatial-Temporal Distribution of3 A-class ETS Episodes
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(Near) Future Efforts• A joint study (or studies) applying various tremor location methods to the same tremor dataset to determine what waveform patterns are best resolved by which method (pros and cons) and why.
• Establish a semi-permanent seismic array in southern VI for mid-/long-term ETS observations (PGC Array).
• Continue VLFE CMT inversion for previous ETS episodes.
• Identify ETS migration details, and their relationship w.r.t. structures.
• Setting up TAMS for WA, OR, and possibly CA.