Geoscience Reference
In-Depth Information
an increase in the
E
z
component of about 10 mV/m, 12 hr before EQ
46
and 22 hr be-
fore EQ49. The ionosphere disturbance zone (Figure 1b--orbit 347) is concentrated
around the earthquake epicenter. Figure 1b shows possible seismic pre-effects of about
2-3 mV/m, 78 hr before EQ
60
. The obtained results of events EQ
1
(orbits 184 and 198),
EQ
46
(orbits 305, 348, and 403) and EQ
60
(orbit 403) are summarized in the Table 1.
Table 1.
Parameters of 73 earthquakes selected from USGS website and disturbances in the vertical
component of the quasi-static electric fields observed by INTERCOSMOS-BULGARIA-1300 during
limited period of time.
Earthquake Catalogue
Orbits
Date
∆
t,h
1ndexof
geomag-
netic
activity
Kp
Disturbances
in E;:
componentof the
quasi-static
electric fi elds,
mV/m;
Foreshocks and
aftershocks
Distance from
satellite to
epicentrer, km
t1'-,deg
No
D , M,Y
Time,
UTC,
hhmmss.
mm
Lat,
Long,
Depth,
km
M
EQ
1
198108 17
050444
-60.01
-25.89
33
5.0
184
198
20.08.1981
21.08.1981
+80:30
+104:15
2
4
5
5
1214
1300
07.40
08.38
EQ
2
1981 08 17
170741
-25.45
-179.05
383
5.5
170
213
19.08.1981
22.08.1981
+44: 15
+96: 18
3
3
2
uncertain
1140
1903
06.70
14.09
EQ
3
198108 17
191243
-30.14
-177.53
33
5.1
170
213
19.08.1981
22.08.1981
+42:11
+94:14
3
3
3, cumulative
effect of EQ3,7
uncertain
1067
1910
05.70
14.89
EQ
4
1981.08.18
031252
-4.03
127.32
41
5.0
215
22.08.1981
+113:27
3
foreshock of
EQ13
1875
14.32
EQ
5
1981.08.18
052934
-4.09
127.33
33
5.1
215
22.08.1981
+108:27
3
8, cumulative ef-
fect of EQs,33
1876
14.33
EQ
6
198108 18
132754
65.84
-89.89
18
5.1
193
21.08.1981
+62:28
2
5
1780
12.98
EQ
7
1981 08 19
014107
-33.46
179.66
184
5.1
170
213
19.08.1981
22.08.1981
+11:43
+60:44
3
3
3, cumulative
effect of EQ3,7
absent
1342
1655
09.00
12.00
EQ
8
1981 08 19
030107
-24. 12
180.00
507
4.8
170
213
19.08.1981
22.08.1981
+10:21
+55:24
3
3
absent
absent
1207
1821
07.50
13.08
EQ
9
1981 08 19
060624
-22.98
170.50
25
5.6
170
213
19.08.1981
22.08.1981
+07: 15
+87:53
3
3
10
5
879
974
16.00
04.57
EQ
10
198108 19
122533
-49.79
164.23
33
4.8
213
22.08.1981
+50:05
3
5
1102
06.20
19810820
021948
- ll.48
166.16
70
5.0
213
22.08.1981
+53:56
2
uncertain
933
01.03
EQ
11
EQ
12
1981 08 20
044847
-22.93
-70.55
23
4.9
250
251
25.08.1981
25.08.1981
+120:25
+125:36
3
3
7
7
1569
1853
11.00
14.00
EQ
13
198108 20
151003
-27. 14
-179.15
346
4.9
170
213
22.08.1981
22.08.1981
-25:47
+23:25
3
3
absent
absent
1308
1695
08.60
12.60
EQ
14
19810821
011508
-34. 11
-70.09
117
4.9
250
251
25.08.1981
25.08.1981
+97:02
+101:44
3
3
8
8
1392
2196
09.58
17.35
EQ
15
1981 08 21
182414
-18.77
-174.51
33
4.8
170
213
19.08.1981
22.08.1981
-54:03
+20:04
3
3
absent absent
839
1479
01.50
10.40
EQ
16
1981 08 21
225240
-26.50
-114.76
10
5.1
196
244
21.08.1981
24.08.1981
-13:20
+68:46
2
4
8
absent
909
1394
03.40
09.23
EQ
17
1981 08 22
234741
-35.83
-103.30
10
5.2
196
244
251
21.08.1981
24.08.1981
25.08.1981
-14:12
+43:49
+55:13
2
4
3
10
absent
8
1509
953
2020
10.32
03.42
15.72
