Acoustic inversions from an explosive source of opportunity in the ASIAEX2001-SCS experiment

Acoustic inversions including source localization and geoacoustic inversion from an unexpected explosion in the ASIAEX2001-SCS experiment is presented. Horizontal beamforming is performed to find the source azimuthal direction and the water wave part of the modal dispersion curve is used to find the source range. The relation of the source depth and the charge weight has been obtained from the bubble pulse period. The localization result shows that the detonation occurred in the direction of east-north east and about 30 km distant from the receiver. To perform the bottom inverse, we use a broadband linear inverse technique employing the modal group velocity, which is inferred from the modal arrival time and source range. In the end, a four-layered bottom model is created, which is consistent with both our explosion data and independent source tow data. The resolution and variance of the estimate are also presented. In conclusion, this bottom model should be widely applicable for modeling broadband sound propagation in the ASIAEX2001-SCS experiment site.