Field Detection of Microcracks to Define the Nucleation Stage of Earthquake Occurrence

Table 1

Catalog B-type Pulse 2011-03-03∼2011-03-11.

Number	Second	Hour	Type	Strength (mV)	Duration (ms)	Comment
	3-March
1	74089.15	20.58	B-2	−3.5	40	P phase?
2	76994.65	21.39	B-3	−5.5	30	P phase
3	77752.56	21.60	B-1	2	25
	4-March
4	63758.70	17.71	B-3	11.5	30
5	64522.10	17.92	B-2	5	40
6	65485.30	18.19	B-2	−11.5	10
7	65937.20	18.32	B-2	12	10
8	81148.30	22.54	B-2	−3.0	10	P phase
	6-March
	Till 14:00 (no-data)
8	50571.1	14.05	B-1	2	30
9	53094.25	14.75	B-1	3.8	40
10	53336.8	14.82	B-1	16.0	40
11	64179.30	17.83	B-1	3.3	40	Clear P phase
12	65995.55	18.33	B-2	6.5	14
13	70869.25	19.69	B-2	3.5	20
14	75902.15	21.08	B-2	9.5	25
15	83206.30	23.11	B-3	−2.2	40
16	84237.55	23.40	B-2	8.3	25	Subevents
	7-March
16	16950.85	4.71	B-2	2	15
17	20103.65	5.58	B-2	3.3	12
18	64481.80	17.91	B-2	2.1	13
19	68579.95	19.05	B-1	2.2	37
20	69144.05	19.21	B-3	4.2	40
21	69559.45	19.32	B-2	2.1	9
22	79177.40	21.99	B-3	7.9	45
	8-March
23	17343.05	4.82	B-2	8.0	35	P, S phase
24	21232.45	5.90	B-3	12.4	45	P, S phase
25	21512.30	5.98	B-1	4.1	37	HF. At 1st step
26	26099.85	7.25	B-2	2.1	4
27	26871.50	7.46	B-3	5.7	37
28	31388.05	8.72	B-1	7.0	45	Subevent in coda
29	33307.20	9.25	B-1	4.1	60	P, S phase?
30	33624.30	9.34	B-1	8.5	60
31	39163.85	10.88	B-1	5.1	43
32	39727.80	11.04	B-1	4	40
33	42297.30	11.75	B-2	2	7
34	44458.00	12.35	B-2	2	15
35	75881.30	21.08	B-2	2.2	8
36	79821.30	22.17	B-3	5.8	30
37	80090.35	22.25	B-3	−3.8	45
38	80203.15	22.28	B-2	6.2	20
39	82117.00	22.81	B-3	11.5	50
40	82234.60	22.84	B-1	3	40
41	82617.35	22.95	B-3	5.8	40
42	83904.35	23.31	B-2	2.7	10
43	83904.40	23.31	B-2	5	10
44	85307.20	23.7	B-2	4.1	10
45	85885.95	23.86	B-2	−11.7	25
46	86122.75	23.92	B-3	−2.8	30	P, S phase?
47	86738.30	24.09	B-2	2.2	10
48	86953.40	24.15	B-2	4.2	15
49	87379.20	24.27	B-2	2.1	10
50	87590.00	24.33	B-2	6.0	10
51	89027.35	24.73	B-1	5	45
	9-March
52	2493.70	0.69	B-1	2.5	47
53	3817.85	1.06	B-2	3.7	33	High freq.com at 1st step 1.5 kHz
54	4109.35	1.14	B-3	8.3	43
55	5327.10	1.48	B-3	6	44
56	5374.60	1.49	B-1	2.2	32
57	6221.80	1.73	B-3	2.1	40
58	6272.40	1.74	B-3	3.5	50	Complex
59	6454.95	1.79	B-3	5.4	60
60	6684.75	1.86	B-3	8.9	30	P, S phase?
61	7091.50	1.97	B-3	18.3	40	P, S phase?
62	8501.15	2.36	B-1	3	30
63	11404.10	3.17	B-1	3.5	35	P, S phase?
64	12040.80	3.34	B-1	3.5	40	P, S phase?
65	12185.25	3.38	B-1	8.0	20
66	12983.65	3.61	B-1	7.5	50	P, S phase?
67	14067.05	3.91	B-2	6.3	30	P, S phase?
68	14206.80	3.95	B-1	5	40	P, S phase?
69	16891.85	4.69	B-3	11.3	30	P, S phase?
70	16892.00	4.69	B-2	4.1	10
71	19113.05	5.31	B-2	4.5	10	P, S phase?
72	19198.05	5.33	B-1	3	35	P, S phase?
73	21171.70	5.88	B-1	2	30
74	21657.55	6.02	B-1	3.5	40
75	22136.65	6.15	B-1	4	35
76	26479.25	7.36	B-1	3.5	35
77	27832.15	7.73	B-1	2.2	40
78	29191.10	8.11	B-1	3	30
79	30824.20	8.56	B-2	2.2	20
80	31511.55	8.75	B-2	2.2	10
81	33641.20	9.34	B-2	4.3	10
82	33649.35	9.35	B-1	2	35
83	35323.25	9.81	B-1	4	45
84	37181.60	10.33	B-2	−2.1	10
85	39193.76	10.89	B-2	4	10
86	42674.60	13.8	B-2	4	40
87	54068.55	15.02	B-2	2	10
88	55135.70	15.32	B-1	11.3	40
89	66156.10	18.38	B-2	−5.1	10
90	66775.25	18.55	B-2	5.1	30
91	67365.35	18.43	B-1	4	40
92	67574.65	18.77	B-2	3	27	Complex
93	67651.80	18.79	B-2	2.8	10
94	67766.85	18.82	B-1	3.7	33
95	67999.75	18.89	B-1	3	30	Most complex
96	68063.10	18.91	B-3	10.8	45
97	68211.65	18.95	B-2	5	15	Most complex
98	68801.6	19.11	B-3	11.9	60
99	69211.45	19.23	B-1	3.5	35
100	69769.60	19.38	B-3	−4.0	35
101	70573.30	19.6	B-1	3.1	35
102	71162.05	19.77	B-2	2.9	28	Complex
103	71496.80	19.86	B-1	4.1	50	Subevent
104	71694.70	19.92	B-2	3.5	10
105	71939.50	19.98	B-2	2.8	10
106	72573.75	20.16	B-3	−4.2	25	Complex
107	72754.65	20.21	B-3	−16.0	40
108	73382.65	20.38	B-2	4	10
109	73409.05	20.39	B-2	2.2	8
110	73619.15	20.45	B-1	3	40	Complex
111	73893.35	20.53	B-2	3.9	10
112	74918.70	20.81	B-3	9.2	35
113	75750.80	21.04	B-1	−4.0	30	Subevent
114	76353.05	21.21	B-2	9.7	10	Subevent
115	76732.30	21.31	B-2	3.9	10	Subevent
116	77958.25	21.66	B-2	4.3	15
117	78709.60	21.86	B-3	10.5	40
118	78908.15	21.92	B-2	−7.6	10	Typical B-2 type
119	79258.25	22.02	B-3	2	33	P? subevent?
120	80042.45	22.23	B-2	2.1	9	P? subevent?
121	82451.20	22.9	B-2	4	10
122	82632.30	22.95	B-3	6.5	30	P? subevent?
123	83138.70	23.09	B-2	−10.1	10
124	84541.40	23.48	B-3	11.0	30
125	84795.30	23.55	B-3	6.5	35
126	84841.35	23.57	B-1	4	30	Subevent
127	85341.90	23.71	B-1	4.4	34
128	85352.70	23.71	B-2	6	10
129	85374.55	23.72	B-1	3	45
130	87677.00	24.35	B-1	5	38	P phase?
131	88837.15	24.68	B-2	3.1	10
	10-March
132	3800.15	1.06	B-2	4.1	20	P phase?
133	4262.10	1.18	B-2	2.2	22	P phase?
134	5869.60	1.63	B-2	3.7	15	Subevent
135	7020.15	1.95	B-2	2.5	15
136	7870.35	2.19	B-2	2	10
137	8116.80	2.25	B-2	2	10
138	17156.75	4.77	B-3	12.0	40
139	24115.35	6.70	B-1	5	50
140	24348.45	6.76	B-1	5.5	37
141	75609.20	21.00	B-2	10.5	35	P phase?
142	84056.55	23.35	B-2	2	15
	11-March
143	13276.85	3.69	B-1	3.5	45
144	13400.30	3.72	B-1	2	35
145	15506.5	4.31	B-3	4.2	45	P, S phase
146	18325.85	5.09	B-2	2.2	20	P, S phase
147	21801.45	6.06	B-2	4	20	P, S phase
148	22395.30	6.22	B-2	7.0	10
149	22503.65	6.25	B-2	8.0	10
150	22628.50	6.29	B-2	3	10
151	22891.70	6.36	B-2	−7.0	15
152	23432.95	6.51	B-2	5.5	10	P-S 40 ms
153	23485.85	6.52	B-2	−11.0	35
154	25421.75	7.06	B-2	4	15	P, S phase
155	25658.20	7.13	B-1	12.5	35
156	27287.35	7.58	B-1	2	35
157	27319.50	7.59	B-2	−8.5	10
158	27385.00	7.61	B-1	2	35	P, S phase
159	28639.15	7.96	B-1	3.2	36
160	34295.7	9.53	B-2	2.6	20
161	34564.55	9.60	B-2	4.1	10	P, S phase
162	36804.60	10.22	B-2	2.5	10
163	45290.80	12.58	B-1	2	35	P, S phase