Supplementary Tables
Table S1 Focal mechanism of the aftershocks
No
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
Date
Time
Lat °N
Lon °E
20140126
20140126
20140126
20140126
20140126
20140126
20140126
20140127
20140127
20140127
20140128
20140128
20140128
20140128
20140128
20140128
20140130
20140131
20140131
20140201
20140204
20140206
20140207
20140207
20140208
20140209
20140212
20140214
20140215
20140305
20140310
14:59
18:45
19:03
19:12
21:15
21:42
23:06
09:47
13:05
15:39
01:05
08:07
14:49
19:12
22:22
22:23
11:06
06:52
12:45
16:33
19:42
19:21
03:26
08:59
17:12
08:22
10:34
03:38
07:31
12:49
23:27
38.3099
38.2323
38.1962
38.2502
38.1570
38.1928
38.236
38.1510
38.2355
38.3845
38.2608
38.2168
38.2397
38.4068
38.4145
38.4083
38.4143
38.4173
38.4170
38.1730
38.2850
38.1628
38.3242
38.2328
38.2507
38.1812
38.1655
38.1853
38.2247
38.0780
38.2222
20.4254
20.3790
20.4075
20.4128
20.3337
20.4990
20.4077
20.4192
20.4127
20.4432
20.3997
20.4877
20.4877
20.5005
20.4965
20.4557
20.4957
20.4875
20.4802
20.3612
20.3942
20.3795
20.4410
20.4287
20.4392
20.3863
20.3538
20.3498
20.3538
20.3092
20.3342
Depth
(km)
10
7
14
14
8
9
6
4
3
5
3
19
13
2
2
3
3
5
5
9
5
19
3
9
9
3
11
7
5
1
7
Mw
4.2
5.2
4.3
4.3
4.5
3.8
4.2
4.1
4.4
4.2
3.9
4.0
3.9
4.4
4.2
4.1
4.5
4.3
4.4
4.8
4.2
4.4
3.9
4.1
3.9
4.5
4.5
4.7
4.7
4.8
4.0
Strike
(°)
210
148
10
18
29
254
165
139
206
196
293
101
48
194
103
112
9
13
11
206
162
20
181
172
346
321
190
112
146
203
119
Dip
(°)
75
65
76
87
79
63
65
61
88
75
53
43
89
89
62
49
70
79
69
71
66
72
70
89
75
55
83
57
77
75
72
Rake
(°)
178
57
174
177
-177
-7
71
55
-161
-157
5
6
-173
-117
-1
22
148
173
173
-152
67
-161
81
-176
-157
30
-176
-5
67
114
53
No of
stations
7
6
6
6
6
6
7
6
7
7
7
6
6
7
8
6
8
7
8
6
6
6
7
8
6
6
6
7
6
6
6
VR
(%)
23
35
57
44
55
36
71
39
61
76
83
37
59
78
52
63
74
65
85
68
84
35
49
68
59
76
65
65
67
69
75
DC
(%)
90
87
99
55
93
92
70
94
82
70
98
38
89
77
90
95
73
93
72
99
56
86
98
57
93
75
28
79
100
98
89
Table S2 Corner points of the finite faults as parameterized in the slip inversions
January 26, 2014
20 km ×20 km
Depth: 0.5-30 km
February 3, 2014
segment 1
24 km ×10 km
Depth: 0.5-10.5 km
segment 2
20 km ×10 km
Depth: 0.5-10.2 km
Upper left
Upper right *
Bottom left
Bottom right
38.1390 °N
20.3280 °E
38.3932
20.4453
38.1230
20.3838
38.3771
20.5013
38.3460 °N
20.4270 °E
38.1296
20.4270
38.3460
20.4190
38.1296
20.4190
38.1352 °N
20.3226 °E
38.2879
20.4477
38.1235
20.3434
38.2772
20.4716
* Direction along the fault strike
Table S3 Parameters of the principal stress axes based on the inversion from aftershocks (see
also Figure 7 and S7).
σ1
σ2
σ3
Azimuth (°)
248
63*
158*
Shape ratio
* Highly uncertain, see Figure S7c
Plunge (°)
7
83 *
1*
0.87
Supplementary Figures
Figure S1 Stations used in the waveform inversions. Squares and triangles indicate broadband
and strong motion stations, respectively. Blue triangles denote stations without accurate
timing.
Figure S2 Displacement waveform fit for the CMT calculations (0.05-0.08 Hz). The observed
and synthetic waveforms are shown in black and red, respectively, for a) the 1st and b) the 2nd
event.
Figure S3 Final slip distribution on faults, superimposed by the slip-rate functions plotted for
all subfaults (left), and the time of occurrence of slip-rate maximum (right). a) 1st event, b) 2nd
event – segments 1 and 2. Stars denote the corresponding hypocenters (Table 1) projected on
the respective fault planes as in Figures 4 and 5. The slip-rate range on vertical axes of small
figures is 0.2 m/s and 0.5 m/s in panels a) and b), respectively. The slip-rate range on
horizontal axes of small figures is 12 s and 10 s in panels a) and b), respectively.
Figure S4 Displacement waveform fit for slip inversion (0.05-0.2 Hz). The observed and
synthetic waveforms are shown in black and red, respectively. Peak observed displacement
appears to the right. a) 1st event, b) 2nd event – both segments 1 and 2 considered in the
inversion, c) 2nd event – only segment 1 considered in the inversion. The Z-component of
DMLN station was excluded from inversion due to disturbed record.
Figure S5 Apparent source time functions of the 1st event, derived by the EGF method.
Figure S6 Static surface displacements, calculated from the seismically derived slip model
and applying forward modeling, of the February 3, 2014 event, using the two segments
proposed by Boncori et al. (2015). The star marks the epicenter location. The black arrow
vectors denote a) horizontal and b) vertical motion. Panels c) and d) show the same for the
single-segment model, basically keeping all major features of the displacement field.
Figure S7 Stress field derived from the aftershocks. a) P-T axes of the aftershocks and the
principal stress axes. b) Mohr’s diagram with projected aftershocks. c) Principal stress axes
and their uncertainty. d) Uncertainty of the stress-shape ratio.