Abstract
The article presents the results of microseismic signals of the “voice of the sea” registration by a two-coordinate laser strainmeter during the passage of typhoons through and near the water area of the Sea of Japan. It was established that the “voice of the sea” microseisms appear and disappear almost simultaneously with primary microseisms, i.e., the powerful “voice of the sea” microseisms exist only in the presence of powerful wind waves, generated by a passing typhoon. According to the processing results of the obtained experimental data, the “voice of the sea” microseisms generation area is located in the “sea-land” transition zone, i.e., near and/or in the surf zone. Based on the data of the two-coordinate laser strainmeter, we determined the bearing of the “voice of the sea” microseisms generation area. The movement of this area coincides with the movement of the rear part of tropical cyclones.
Highlights
IntroductionTropical cyclones (typhoons) are among the Earth’s catastrophic processes and phenomena
“AEROCOSMOS” Research Institute for Aerospace Monitoring, 105064 Moscow, Russia; Abstract: The article presents the results of microseismic signals of the “voice of the sea” registration by a two-coordinate laser strainmeter during the passage of typhoons through and near the water area of the Sea of Japan
The total attenuation of the “voice of the sea” microseisms almost coincided with the presence of the primary microseisms in the signal spectrum and disappeared when their period dropped to 7.5 s
Summary
Tropical cyclones (typhoons) are among the Earth’s catastrophic processes and phenomena. Development of seismo-acoustic monitoring methods is partially based on information obtained from the zones of formation of the “surf infrasound” in the frequency range from 1 to 5 Hz, which is formed near sea coasts and associated with interaction of sea wind waves [17,18]. In [24], a mechanism of the formation of the “voice of the sea” signals was proposed as a result of the interaction of multidirectional surface waves generated at the turn of the wind direction in an atmospheric vortex over the sea. This causes a nonlinear interaction of surface waves propagating in opposite directions to each other, with formation of the second harmonic in the form of a standing surface wave. During the analysis of the obtained processing results, we compared the trajectories of the central part of the typhoons with the publicly available archives of meteorological and satellite data [27,28], and with the model data of wind generation in the near-surface part of the sea [29]
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