Journal: |
Earthquake Science 2011 No.6
clicks:684 |
Title:
|
|
Author:
|
Dimitar Ouzounov;Sergey Pulinets;Alexey Romanov;Alexander Romanov;Konstantin Tsybulya;Dmitri Davidenko;Menas Kafatos;Patrick Taylor; |
Adress: |
Department of Physics,Chapman University,Orange,CA 92866,USA; |
Abstract:
|
We retrospectively analyzed the temporal and spatial variations of four
different physical parameters characterizing the state of the atmosphere and
ionosphere several days before the M9 Tohoku,Japan earthquake of March
11,2011.The data include outgoing long wave radiation(OLR),GPS/TEC,lower Earth
orbit ionospheric tomography and critical frequency foF2.Our first results show
that on March 7th a rapid increase of emitted infrared radiation was observed
from the satellite data and an anomaly developed near the epicenter.The GPS/TEC
data indicate an increase and variation in electron density reaching a maximum
value on March 8.Starting from this day in the lower ionosphere also there was
confirmed an abnormal TEC variation over the epicenter.From March 3 to 11 a
large increase in electron concentration was recorded at all four Japanese
ground-based ionosondes,which returned to normal after the main earthquake.The
joint preliminary analysis of atmospheric and ionospheric parameters during the
M9 Tohoku,Japan earthquake has revealed the presence of related variations of
these parameters implying their connection with the earthquake process.This
study may lead to a better understanding of the response of the
atmosphere/ionosphere to the great Tohoku earthquake. |
Comment: |
|
|
|