Triangulation scale error caused by the 1894 Shonai earthquake: a possible cause of erroneous interpretation of seismic potential along the Japan Trench

Sagiya, Takeshi; Matta, Nobuhisa; Ohta, Yusaku

doi:10.1186/s40623-018-0890-9

Earth, Planets and Space

Table 1 Detailed survey record of the Shionohara baseline

From: Triangulation scale error caused by the 1894 Shonai earthquake: a possible cause of erroneous interpretation of seismic potential along the Japan Trench

Segment	Survey 1		Survey 2		Survey 3		Survey 4		Average (m)	S.D. (mm)
Segment	Date and time	Length (m)	Date and time	Length (m)	Date and time	Length (m)	Date and time	Length (m)	Average (m)	S.D. (mm)
1	5/31 5:00–7:57	389.9987	6/16 16:03–19:39	389.9981	6/19 5:23–8:20	389.9992	7/3 16:35–18:50	389.9985	389.9987	0.4
2	6/16 5:01–7:48	398.4272	5/31 15:40–18:06	398.4268	7/3 4:55–7:09	398.4271	6/20 14:55–17:35	398.4269	398.4270	0.2
3	6/1 4:57–8:27	490.9707	6/14 15:40–18:22	490.9701	6/21 5:18–8:07	490.9708	7/2 16:21–18:38	490.9695	490.9703	0.6
4	6/14 5:02–7:55	430.9443	6/1 15:51–18:09	430.9438	7/5 6:06–8:37	430.9457	6/22 15:45–18:40	430.9440	430.9445	0.9
5	6/2 4:42–7:23	426.4424	6/13 15:37–18:02	426.4414	6/23 4:50–7:31	426.4426	7/1 16:15–18:19	426.4423	426.4422	0.5
6	6/13 4:30–7:31	426.3462	6/2 16:12–18:40	426.3450	7/1 4:40–7:07	426.3465	7/4 16:17–18:42	426.3463	426.3460	0.7
7	6/3 4:47–7:42	426.3831	6/12 16:25–18:49	426.3822	6/25 4:58–7:52	426.3835	6/30 15:44–17:48	426.3823	426.3828	0.6
8	6/10 4:40–7:45	430.5900	6/4 15:45–18:19	430.5913	6/30 4:55–7:14	430.5908	7/5 16:14–18:31	430.5919	430.5910	0.8
9	6/5 4:50–7:26	426.3055	6/9 15:33–18:13	426.3045	6/26 5:02–7:32	426.3071	6/29 16:16–18:21	426.3061	426.3058	1.1
10	6/8 5:50–8:32	426.3147	6/5 15:45–18:14	426.3146	6/29 5:23–7:52	426.3155	6/26 16:21–18:29	426.3150	426.3150	0.4
11	6/6 4:47–7:34	426.7336	6/7 15:57–18:19	426.7327	6/27 4:53–7:23	426.7344	6/28 16:12–18:20	426.7333	426.7335	0.7
12	6/7 5:15–8:08	430.1305	6/6 16:09–18:52	430.1303	6/28 5:18–7:48	430.1310	6/27 16:22–18:45	430.1305	430.1306	0.3
Total		5129.5870		5129.5808		5129.5943		5129.5867	5129.5872	5.5

The survey was conducted from May 31 to July 5 in 1894. Measured length of each segment has been corrected for temperature, slope, and altitude

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