6:15 PM - 7:30 PM
[PEM27-P06] The relationship between ionospheric disturbances detected by HFD and ground perturbations associated with earthquakes
Keywords:ionosphere, HFD, earthquake, acoustic wave, seismometer, ground perturbations
We examined the correlation of the maximum values of ionospheric vertical drift velocity and vertical velocity of ground motion for 30 events (M≥6, 2003~2013) . HFD observatories are Sugadaira, Oarai, and Iitate. The closest seismomete from each reflection points were selected.
As for Sugadaira observatory (20 events) , ionospheric velocity tends to increase in proportion to the square root of the ground velocity regardless of types of seismometers. In the other two observatories (Oarai, Iitate), ionospheric velocities are not proportional to square root of the ground perturbations. This is because sufficient events are not supplied (6~12 events) in these observatories. However, the ionospheric vertical velocity increases with the ground velocity. If the numbers of the events are larger, the correlations of these observatories would be the same as the result of Sugadaira.