Infrasonic waves in the ionosphere generated by a weak earthquake

0367508 - ÚFA 2012 RIV GB eng J - Journal Article
Krasnov, V. M. - Drobzheva, Ya. V. - Chum, Jaroslav
Infrasonic waves in the ionosphere generated by a weak earthquake.
Journal of Atmospheric and Solar-Terrestrial Physics. Roč. 73, č. 13 (2011), s. 1930-1939. ISSN 1364-6826. E-ISSN 1879-1824
R&D Projects: GA ČR GA205/07/1367; GA ČR GA205/09/1253
Institutional research plan: CEZ:AV0Z30420517
Keywords : Earthquake * Infrasonic waves * Ionospheric disturbances
Subject RIV: BL - Plasma and Gas Discharge Physics
Impact factor: 1.596, year: 2011
http://www.sciencedirect.com/science/article/pii/S1364682611001374

A computer code has been developed to simulate the generation of infrasonic waves (frequencies considered <= 80 Hz) by a weak earthquake (magnitude similar to 3.6), their propagation through the atmosphere and their effects in the ionosphere. We provide estimates of the perturbations in the ionosphere at the height (similar to 160 km) where waves at the sounding frequency (3.59 MHz) of a continuous Doppler radar reflect. We have found that the pressure perturbation is 5.79 x 10(-7) Pa (0.26% of the ambient value), the temperature perturbation is 0.088 K (0.015% of the ambient value) and the electron density perturbation is 2 x 10(8) m(-3) (0.12% of the ambient value). The characteristic perturbation is found to be a bipolar pulse lasting similar to 25 s, and the maximum Doppler shift is found to be similar to 0.08 Hz, which is too small to be detected by the Doppler radar at the time of the earthquake.
Permanent Link: http://hdl.handle.net/11104/0202162