12/25/2023 0 Comments Acoustic signal processing![]() ![]() To this end, we consider Anderson’s faulting theory (1905) 4 where the equations of stress produced over the fault planes in an earthquake are analysed and earthquakes are divided into three classes depending on the faulting type: wrench (when the greatest pressure is in the horizontal plane), normal, and reversed. Thus, there is a need to identify the slip direction prior to applying the model in real-time. However, this model can be applied only when the slip direction is vertical. Gomez and Kadri 3 proposed an inverse problem model which calculates the effective fault dimensions and vertical uplift speed and duration induced by underwater earthquakes, using slender fault theory 1. In order to characterise tectonic events, the source dimensions, dynamics and moment magnitude need to be estimated, which can be approached by automated underwater acoustic signal processing methods. The classification and characterisation of such information are important for the assessment of potential Tsunamis. This property of AGWs allows them to carry information on the sound source 1, 2. Underwater seismic events can produce very long compression-type waves, known as acoustic-gravity waves (AGWs), that propagate in the water layer travelling long distances with almost no attenuation 1 and can be recorded by distant hydrophones. ![]() The results were compared against values reported by the Harvard Global Centroid Moment Tensor catalog (gCMT), revealing statistical significance between the extracted acoustic properties used to feed machine learning algorithms and the predicted slip and magnitude values. slip type, magnitude) and provides near real-time estimation of the effective properties of the fault dynamics and geometry. The analysis allows identifying the type of earthquake (i.e. In this work, we analysed hydrophone recordings of 201 earthquakes, located in the Pacific and the Indian Ocean, by employing acoustic signal processing and classification methods. Effective early warning, emergency response, and information dissemination for earthquakes and tsunamis require a rapid characterisation of the fault properties: geometry and dynamics. Underwater seismic events generate acoustic radiation (such as acoustic-gravity waves), that carries information about the source and can travel long distances before dissipating. ![]()
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