1972 earthquake

• Need to have a map showing the 1951 earthquake sequences and the 1972 earthquake sequences, and the potential location of the 1972 surface rupture

Mainshock magnitude

• It is important to find out what is the magnitude of the mainshock. The magnitude from global catalog is listed below

Source	緯度(N)	經度(E)	深度(km)	規模	Type
NEIC	23.6	121.60	33	7.2	Ms
ISCGEM	23.564	121.539	22.2	7.0	Mw

Aftershocks

Relocated mainshock and aftershocks From 蔣(1984)

地震編號	緯度(N)	經度(E)	深度(km)	規模(mb)	年	月	日	時	分	秒
A	23.59	121.54	29.3	6.1	72	4	24	17	57	22.06
B	23.48	121.39	39.7	5.2	72	4	24	19	32	12.65
C	23.52	121.4	52.5	5.1	72	4	24	20	0	34.81
D	23.62	121.49	32.7	4.8	72	4	24	20	22	43.58
E	23.57	121.41	8.6		72	4	24	20	45	41.19
F	23.71	121.66	42.8		72	4	25	1	30	35.69
G	23.78	121.58	26	5.4	72	4	25	1	58	31.91
H	23.88	121.5	42.7	4.7	72	4	25	3	30	29.68
I	23.92	121.36	11.6		72	4	25	3	44	5.12
J	23.94	121.34	16.2	4.3	72	4	25	3	59	49.68
K	23.75	121.74	16.4		72	4	25	4	34	18.8
L	23.58	121.61	48.4	4.7	72	4	25	7	27	57.24
M	23.85	121.31	28.5	4.6	72	4	27	7	48	28.18
N	23.8	121.56	27.1		72	4	27	22	26	28.38
O	23.9	121.55	33.7	4.8	72	5	2	4	1	21.3
P	23.68	121.08	16.4		72	5	6	16	59	21.34
Q	23.86	121.26	26.1		72	5	25	2	38	48.12
R	23.61	121.7	3	4.5	72	8	1	1	4	44
S	23.9	121.6	36	5.5	72	11	8	22	25	46.5
T	23.95	121.28	22	5.9	72	11	10	2	41	14.5
U	23.87	121.66	27	5.5	72	11	21	10	47	16.4

From 詹(1985)

地震編號	緯度(N)	經度(E)	深度(km)	規模(Mcw)	年	月	日	時	分	秒
A	23.51	121.53	15.42	6.38	72	4	24	17	57	22.01
B	23.52	121.31	1.82	5.51	72	4	24	19	32	11.37
C	23.49	121.25	5.83	4.92	72	4	24	20	0	32.77
D	23.6	121.57	22.05	4.68	72	4	24	20	22	42.35
E	23.62	121.34	3.12	4.24	72	4	24	20	45	42.56
F	23.71	121.55	23.94	4.47	72	4	25	1	30	34.48
G	23.69	121.62	26.12	5.47	72	4	25	1	58	31.55
H	23.65	121.62	25.69	4.4	72	4	25	3	30	24.59
I	23.65	121.58	0.51	4.01	72	4	25	3	44	2.81
J	23.75	121.5	22	4.29	72	4	25	3	59	48.78
K	23.74	121.46	17.26	4.26	72	4	25	4	34	19.88
L	23.58	121.5	21.97	4.37	72	4	25	7	27	55.94
M	23.76	121.29	0.85	4.84	72	4	27	7	48	25.57
N	23.78	121.56	0.98	4.26	72	4	27	22	26	26.51
O	23.78	121.57	0.69	5.16	72	5	2	4	1	18.32
P	23.62	121.32	8.37	4.24	72	5	6	16	59	16.93
Q	23.76	121.37	9.96	4.25	72	5	25	2	38	46.12

Ground deformations

• Mostly associated to the landslides and the slope failures.
• A more-than-2-km-long fissure is interesting.
• No clear evidence of surface rupture at the base of the coastal range.