Auxiliary 1.
Two movies of ms01.avi and ms02.avi show the time evolutions of occurrence areas
continuous decrease and increase anomaly, respectively. The red (blue) lattices in
movies denote the increase (decrease) anomalies continuously appearing during the
marked periods. The red star denotes the epicenter.
Auxiliary 2.
Auxiliary 2. Regional variability index in Hector Mine region during October 1999.
(From top to bottom) Derived by the cut-off elevation angle of 20°, cut-off elevation
angle of 45° in this study, Pulinets et al. [2007], Thomas et al. [2012], and the GIM
TEC ±10° latitude & ±15° longitude, and the GIM TEC ±5° latitude & ±
10° longitude centered from the epicenter. Red (gray for Pulinets et al. [2007])
and black line denote the regional variability index and 1-day running average of the
regional variability index, respectively. The blue line denotes the occurrence of
M7.1 Hector Mine earthquake. Green lines/arrows denote the similar tendencies.
Auxiliary 3. Three tables listed the GPS stations of three areas used in this study.
Table 1. The 13 GPS Stations Used to Calculate GPS TEC Sorted by Distance From
the Hector Mine Earthquake Epicenter.
Station
Number
Geodetic
Longitude
Geodetic
Latitude
Magnetic
Latitude
(E)
(N)
()
Distance From
Earthquake
(km)
5
6
7
8
gol2
sio3
cat1
scip
fern
-116.89
-117.25
-118.48
-118.49
-112.45
35.43
32.86
33.45
32.91
35.34
41.92
39.16
39.76
39.23
42.39
109
213
240
278
358
harv
echo
casa
-120.68
-114.26
-118.90
34.47
37.92
37.64
40.46
44.71
43.83
404
412
413
9
10
cosa
fred
-111.88
-112.50
33.57
36.99
40.71
44.01
420
432
11
farb
-123.00
37.70
43.31
696
12
pie1
-108.12
34.30
41.87
748
13
azcn
-107.91
36.84
44.40
795
1
2
3
4
Station
Name
Table 2. The 13 GPS Stations Used to Calculate GPS TEC Sorted by Distance From
the Center in Europe.
Station
Number
Station
Name
Geodetic
Longitude
Geodetic
Latitude
Magnetic
Latitude
(E)
(N)
()
Distance From
Earthquake
(km)
1
2
3
geno
medi
vene
8.92
11.65
12.33
44.42
44.52
45.44
44.88
44.51
45.29
107
141
189
4
5
patk
gras
11.46
6.92
47.21
43.75
47.15
44.57
270
282
6
7
8
9
unpg
zimm
aqui
rtmn
12.36
7.47
13.35
14.34
43.12
46.88
42.37
47.52
43.03
47.51
42.13
46.97
282
286
398
436
10
karl
8.41
49.01
49.42
462
11
12
13
creu
cagl
toul
3.32
8.97
1.48
42.32
39.14
43.56
43.79
39.74
45.31
614
657
697
Table 3. The 8 GPS Stations Used to Calculate GPS TEC Sorted by Distance From the
Center in Japan.
Station
Number
Station
Name
Geodetic
Longitude
Geodetic
Latitude
Magnetic
Latitude
(E)
(N)
()
Distance From
Earthquake
(km)
1
2
3
4
tkba
usud
mzsw
tohk
140.09
138.36
141.20
133.70
36.11
36.13
39.11
35.49
27.51
27.39
30.58
26.40
99
176
257
589
5
stkw
141.84
43.53
35.02
743
6
7
8
knya
daej
oknw
130.88
127.37
127.77
31.43
36.40
26.14
22.18
26.93
16.74
1042
1127
1671