3D matching positioning method for landslide using infrasound signal received by triangular pyramid vector array, based
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ORIGINAL PAPER
3D matching positioning method for landslide using infrasound signal received by triangular pyramid vector array, based on ray theory Jiubin Zhao 1 & Yuanxue Liu 1 & Juntang Yang 1 Received: 26 March 2020 / Accepted: 26 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Several hours before landslides occur, part of the rock and soil body begin to burst, rub, and fracture, generating infrasound signals propagate outward. 3D advanced positioning of the landslide has remained unsolved, which is important for disaster prevention. Using the infrasound signal send from location of the landslide, this work aimed at proposing an advanced 3D matching positioning method, based on ray theory. We first proved vectority of the instantaneous sound pressure field from the perspective of air dynamics, and used ray theory to deduce a point’s instantaneous sound pressure in the air as the sum of all characteristic sound ray vectors. Based on this, the 3D vector acoustic field model was established through simulation. We also found that the triangular pyramid array has vertical and horizontal sampling capabilities, which can collect the vector signals due to the directional anisotropy between the elements. Consequently, the 4-element triangular pyramid vector array was designed to be placed in the acoustic field to receive infrasound signals. Since the infrasound signal is issued before the landslide, we then proposed the 3D matching positioning method: by calculating the cost function of the measurement signal of the triangular pyramid vector array and the copy signals calculated by the propagation model in the predetermined space, point by point, the maximum value was predicted as the infrasound source position, also as the predicted location of landslide. We performed simulations in complex mountainous terrain and applied the method to localization of infrasound sources before the occurrence of the landslide. As a result, by searching and matching in massive space points, we obtained the accurate infrasound source coordinates. This study shows the application prospects of this method for predicting geohazards position several hours in advance. Keywords Landslide infrasound . Triangular pyramid vector array . 3D matching positioning . Ray tracing
Introduction Geological disasters (landslides, debris flows, etc.) occur with a significant generation of energy release producing seismic and acoustic signals. Many scholars used these signals to study the detection, identification, and positioning technology of geological hazards. Yan et al. (2020) used the seismic network to monitor the seismic waves generated by Xinmo landslide in various deformation stages, and extracted
* Yuanxue Liu [email protected] 1
Chongqing Key Laboratory of Geomechanics & Geoenvironmental Protection, Department of Military Installations, Army Logistics University of PLA, Chongqing 401311, China
the characteristics of seismic waves using signal processing methods. They found that the frequency range of
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