Point‐Source Inversion of Small and Moderate Earthquakes From P‐wave Polarities and P/S Amplitude Ratios Within a Hierarchical Bayesian Framework: Implications for the Geysers Earthquakes
- Shang, Xueyi
- Tkalčić, Hrvoje
DOIAbstract
Characterizing seismic moment tensors of small‐ to moderate‐magnitude earthquakes (i.e., 2.5<M<4.0) still represents a challenge in observational seismology. To address this problem, inversion methods based on fitting the first‐motion polarity and/or the amplitude ratios of the recorded waves have been designed, and where possible, the full waveform inversions were also used. The inversions that include a combination of subsets of data are desirable, but the weighting of each subset is typically treated in an ad hoc manner. In order to circumvent this problem, here we develop a new method in a Bayesian framework, which apart from the model‐parameter means and uncertainties, also relaxes the weighting scheme as a free hyper‐parameter. We the...
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