Shinko maekawa, Masashi hayakawa

1
First Result
A study on the association of ionospheric
perturbations with the earthquakes in Japan, as
based on the JG2AS signal observation at
Moshiri(Hokkaido) and at Kochi
Shinko maekawa, Masashi hayakawa
2
Data Processing
(Focus our attention to night time fluctuation)
?Remove stationary trend(Ex. Seasonal)
Ak(t) Original amplitude data
ltAk(t)gtrunning mean of 5 days
Night time fluctuation is emphasized.
?Estimate signal fluctuation by dA(t)
Signal deviation defined as
3
JG2AS-KOC
Blue bars show Japanese coastal earthquakes
occurred near the path.
10 Sep 2004 0205 33.05 136.52 5.6 10.0 NEAR S.
COAST OF WESTERN HONSHU 08 Sep 2004 1458 33.14
137.14 6.2 10.0 NEAR S. COAST OF HONSHU, JAPAN
05 Sep 2004 1457 33.15 137.04 7.1 10.0 NEAR S.
COAST OF HONSHU, JAPAN
Signal deviation
Aug.7-Oct.31 2004
4
Sep.05 2004 M7.1 Depth25 33.17N 137.14E Oct 06
2004 M5.9 Depth67.2 36.0N 140.1E Oct 23 2004 Mgt7
Depth16.4 37.3N 138.9E
Original amplitude data
Signal deviation(-2day running mean)
01 May-31 Oct 2004
5
Gray bars show the earthquakes occurred near the
path.(Magnitude gt4.5, Depthlt100km and within
circle of 200km around receivers and
transmitter.) We think that peaks of signal
deviation corresponds to the earthquakes.
However, We need the rigid threshold for
separating the earthquakes.
JG2AS-KOC
(Jan.1-Oct.31 2004)
Signal deviation
6
JG2AS-HOK
Signal deviation
Jan.1-Oct.31 2004