Publications by authors named "Julien Vergoz"
The 15 January 2022 climactic eruption of Hunga volcano, Tonga, produced an explosion in the atmosphere of a size that has not been documented in the modern geophysical record. The event generated a broad range of atmospheric waves observed globally by various ground-based and spaceborne instrumentation networks. Most prominent was the surface-guided Lamb wave (≲0.
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- The estimation of slowness vectors for infrasound waves is important for determining arrival direction, but topographical changes can introduce biases if sensor heights are ignored.
- The study introduces an unbiased 3D estimation method that reduces bias but increases variance, and using a priori constraints on the slowness vector can help lower this variance while maintaining acceptable bias levels.
- Simulations with synthetic and real data demonstrate that this constrained 3D estimator achieves an optimal balance between bias and variance, especially when accurate information about wave speed is available.