dorsal/arxiv
View SchemaThe shock-acoustic waves generated by earthquakes
| Authors | E. L. Afraimovich, N. P. Perevalova, A. V. Plotnikov, A. M. Uralov |
|---|---|
| Categories | |
| ArXiv ID | physics/0007041 |
| URL | https://arxiv.org/abs/physics/0007041 |
| DOI | 10.5194/angeo-19-395-2001 |
Abstract
We investigate the form and dynamics of shock-acoustic waves generated by earthquakes. We use the method for detecting and locating the sources of ionospheric impulsive disturbances, based on using data from a global network of receivers of the GPS navigation system and requiring no a priori information about the place and time of associated effects. The practical implementation of the method is illustrated by a case study of earthquake effects in Turkey (August 17, and November 12, 1999), in Southern Sumatera (June 4, 2000), and off the coast of Central America (January 13, 2001). It was found that in all instances the time period of the ionospheric response is 180-390 s, and the amplitude exceeds by a factor of two as a minimum the standard deviation of background fluctuations in total electron content in this range of periods under quiet and moderate geomagnetic conditions. The elevation of the wave vector varies through a range of 20-44 degree, and the phase velocity (1100-1300 m/s) approaches the sound velocity at the heights of the ionospheric F-region maximum. The calculated (by neglecting refraction corrections) location of the source roughly corresponds to the earthquake epicenter. Our data are consistent with the present views that shock-acoustic waves are caused by a piston-like movement of the Earth surface in the zone of an earthquake epicenter.
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"abstract": "We investigate the form and dynamics of shock-acoustic waves generated by\nearthquakes. We use the method for detecting and locating the sources of\nionospheric impulsive disturbances, based on using data from a global network\nof receivers of the GPS navigation system and requiring no a priori information\nabout the place and time of associated effects. The practical implementation of\nthe method is illustrated by a case study of earthquake effects in Turkey\n(August 17, and November 12, 1999), in Southern Sumatera (June 4, 2000), and\noff the coast of Central America (January 13, 2001). It was found that in all\ninstances the time period of the ionospheric response is 180-390 s, and the\namplitude exceeds by a factor of two as a minimum the standard deviation of\nbackground fluctuations in total electron content in this range of periods\nunder quiet and moderate geomagnetic conditions. The elevation of the wave\nvector varies through a range of 20-44 degree, and the phase velocity\n(1100-1300 m/s) approaches the sound velocity at the heights of the ionospheric\nF-region maximum. The calculated (by neglecting refraction corrections)\nlocation of the source roughly corresponds to the earthquake epicenter. Our\ndata are consistent with the present views that shock-acoustic waves are caused\nby a piston-like movement of the Earth surface in the zone of an earthquake\nepicenter.",
"arxiv_id": "physics/0007041",
"authors": [
"E. L. Afraimovich",
"N. P. Perevalova",
"A. V. Plotnikov",
"A. M. Uralov"
],
"categories": [
"physics.geo-ph"
],
"doi": "10.5194/angeo-19-395-2001",
"title": "The shock-acoustic waves generated by earthquakes",
"url": "https://arxiv.org/abs/physics/0007041"
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