The article describes a project proposed to determine the epicenter of a future short-focus earthquake tens of hours before and to reduce the magnitude of an impending catastrophic earthquake. It focuses on developing a physical model to determine the conditions necessary for the start of an earthquake, for a method based on the registration of flows of mercury vapor in the gas rising from the Earth. This model gives an explanation of why an earthquake precursor appears so early (such a long period of time can range from a few to hundreds of hours). Normally, the characteristic times of an earthquake precursor for seismic methods are tens of seconds. The project is based on the physical and mathematical models of an earthquake. The derived formula for the time of the precursor of a future earthquake allows us to explain and to describe the time increase for the precursor, depending on the magnitude of the earthquake. The method of reducing the magnitude of an impending catastrophic earthquake is based on the proposed physical model of the onset of an earthquake and is implemented by the action of a vibration source in the region of the detected earthquake epicenter. The proposed system should save citizens, lives from future short-focus earthquakes.
A medium component of the natural linewidth of a Fabry-Perot semiconductor laser found by applying nonlinear photo-refractivity on laser frequencies is considered. The natural linewidth is calculated using a new formula for the line shape which has been derived from the application of nonlinear photorefractivity. Medium, phase, and amplitude components of the natural linewidth are taken into account. We have defined and found the numerical values of laser parameters which describe the natural linewidth of Fabry-Perot semiconductor lasers by solving an inverse problem, and we have simulated all the experimental measurements represented in the literature we have available.
This article develops the ideas presented in the previous article, justifying the project proposed to determine the epicenter of a future short-focus earthquake tens of hours before the earthquake and the project to reduce the magnitude of an impending catastrophic earthquake. A physical and mathematical model of the prototype of a mercury earthquake precursor sensor is proposed, and the signal received by the old sensor is calculated. Analysis of an existing sensor prototype provides an understanding of physical processes and shows the fundamental advantage of the new sensor. An approach is formulated to explain the physical mechanism for reducing the magnitude of an impending catastrophic earthquake. A vibrator described in the literature is considered, the effectiveness of which for reducing the magnitude of future catastrophic short-focus earthquakes is estimated by the calculations of the long time of the earthquake precursor. The requirements for future specialized vibrators for the purpose of Reducing the Magnitude of an Impending Catastrophic Earthquake are formulated.
A new formula for line form inside and outside laser is derived. The linewidth is calculated on the basis of the derived formula for the line form. Our simulation of the linewidth for three Fabry-Perot lasers allows explaining all known to us experimental measurements of semiconductor laser natural linewidth.
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