Frictional stability of porous tuff breccia under subsurface pressure conditions and implications for shallow seismicity

Mizoguchi, Kazuo; Uehara, Shin-ichi; Hirose, Takehiro; Iizuka, Sachiko

doi:10.1186/s40623-021-01419-y

Earth, Planets and Space

Table 1 List of optimized values of the friction parameters from inversion modeling for all experiments

From: Frictional stability of porous tuff breccia under subsurface pressure conditions and implications for shallow seismicity

Run no.	Normal stress (MPa)	Velocity step (µm/s)	Shear Disp. (mm)	a	a. s.d.^a	b	b s.d.^a	D_c (µm)	D_c s.d.^a (µm)	a − b
BASH155-01	2	1 to 0.1	2.96	0.0016	0.00096	0.0047	0.00044	16.2	8.54	− 0.0030
BASH155-02	2	0.1 to 1	3.49	0.0233	0.00504	0.0075	0.00028	27.2	1.41	0.0158
BASH155-03	2	1 to 10	3.99	0.0120	0.00158	0.0083	0.00019	28.9	1.27	0.0037
BASH155-04	2	10 to 100	4.28	0.0127	0.00355	0.0125	0.00103	26.3	3.49	0.0002
BASH155-05	2	100 to 10	4.58	0.0133	0.00360	0.0129	0.00121	10.6	2.16	0.0003
BASH155-06	2	10 to 1	4.89	0.0062	0.00061	0.0086	0.00030	11.5	0.83	− 0.0024
BASH155-07	2	1 to 0.1	5.39	0.0011	0.00069	0.0038	0.00036	21.3	13.6	− 0.0026
BASH155-08	2	0.1 to 1	5.92	0.0173	0.00264	0.0093	0.00019	15.2	0.45	0.0080
BASH155-09	2	1 to 10	6.42	0.0122	0.00141	0.0094	0.00029	13.1	0.61	0.0028
BASH155-10	2	10 to 100	6.72	0.0145	0.00392	0.0105	0.00155	14.5	2.92	0.0040
BASH155-11	2	100 to 10	7.05	0.0080	0.00244	0.0117	0.00078	16.4	2.89	− 0.0037
BASH155-12	2	10 to 1	7.35	0.0026	0.00045	0.0061	0.00018	20.5	2.49	− 0.0034
BASH156-01	5	1 to 0.1	2.92	0.0053	0.00005	0.0017	0.00001	14.5	0.76	0.0036
BASH156-02	5	0.1 to 1	3.45	0.0234	0.00047	0.0163	0.00050	2.0	0.06	0.0071
BASH156-03	5	1 to 10	3.96	0.0157	0.00023	0.0097	0.00025	4.1	0.13	0.0060
BASH156-04	5	10 to 100	4.25	0.0390	0.00088	0.0328	0.00089	1.5	0.05	0.0062
BASH156-05	5	100 to 10	4.54	0.0095	0.00011	0.0058	0.00004	35.0	0.51	0.0037
BASH156-06	5	10 to 1	4.86	0.0053	0.00007	0.0036	0.00004	21.8	0.38	0.0017
BASH156-07	5	1 to 0.1	5.36	0.0056	0.00004	0.0024	0.00002	61.9	0.62	0.0032
BASH156-08	5	0.1 to 1	5.90	0.0195	0.00017	0.0091	0.00012	2.8	0.04	0.0104
BASH156-09	5	1 to 10	6.39	0.0222	0.00079	0.0151	0.00084	2.5	0.14	0.0071
BASH156-10	5	10 to 100	6.69	0.0166	0.00056	0.0106	0.00057	5.3	0.36	0.0060
BASH156-11	5	100 to 10	7.10	0.0079	0.00007	0.0060	0.00003	32.8	0.36	0.0019
BASH156-12	5	10 to 1	7.41	0.0069	0.00006	0.0042	0.00003	26.8	0.35	0.0027
BASH153-01	10	1 to 0.1	1.91	0.0118	0.00180	0.0056	0.00150	0.1	0.02	0.0063
BASH153-02	10	0.1 to 1	2.45	0.0135	0.00034	0.0048	0.00015	5.5	0.17	0.0087
BASH153-03	10	1 to 10	2.95	0.0657	0.00004	0.0599	0.00071	0.4	0.05	0.0058
BASH153-04	10	10 to 100	3.24	0.0114	0.00343	0.0066	0.00254	11.3	6.30	0.0048
BASH153-05	10	100 to 10	3.52	0.0057	0.00058	0.0051	0.00023	31.0	2.77	0.0007
BASH153-06	10	10 to 1	3.83	0.0047	0.00029	0.0033	0.00011	32.8	2.88	0.0014
BASH153-07	10	1 to 0.1	4.33	0.0041	0.00032	0.0022	0.00013	47.9	7.68	0.0019
BASH153-08	10	0.1 to 1	4.87	0.0310	0.01481	0.0259	0.01486	0.8	0.46	0.0051
BASH153-09	10	1 to 10	5.37	0.0163	0.00264	0.0105	0.00278	4.1	1.20	0.0058
BASH153-10	10	10 to 100	5.67	0.0113	0.00328	0.0078	0.00243	9.4	4.50	0.0036
BASH153-11	10	100 to 10	5.98	0.0065	0.00080	0.0056	0.00031	24.2	2.92	0.0009
BASH153-12	10	10 to 1	6.30	0.0064	0.00038	0.0042	0.00013	30.7	2.03	0.0022
BASH157-01	20	1 to 0.1	2.90	0.0051	0.00002	0.0024	0.00001	66.6	0.86	0.0027
BASH157-02	20	0.1 to 1	3.44	0.0277	0.00024	0.0222	0.00025	2.1	0.02	0.0055
BASH157-03	20	1 to 10	3.94	0.0117	0.00007	0.0065	0.00006	9.3	0.12	0.0051
BASH157-04	20	10 to 100	4.23	0.0111	0.00028	0.0077	0.00019	13.5	0.48	0.0034
BASH157-05	20	100 to 10	4.63	0.0069	0.00007	0.0066	0.00003	40.4	0.38	0.0003
BASH157-06	20	10 to 1	4.94	0.0062	0.00003	0.0049	0.00001	46.6	0.23	0.0014
BASH157-07	20	1 to 0.1	5.44	0.0056	0.00002	0.0029	0.00001	55.0	0.19	0.0026
BASH157-08	20	0.1 to 1	5.98	0.0157	0.00039	0.0103	0.00041	3.5	0.15	0.0053
BASH157-09	20	1 to 10	6.48	0.0102	0.00009	0.0071	0.00007	7.3	0.12	0.0031
BASH157-10	20	10 to 100	6.77	0.0124	0.00042	0.0091	0.00034	8.4	0.48	0.0033
BASH157-11	20	100 to 10	7.05	0.0048	0.00006	0.0065	0.00002	37.8	0.31	− 0.0017
BASH157-12	20	10 to 1	7.37	0.0055	0.00003	0.0049	0.00001	33.4	0.21	0.0006

^aStandard deviation of friction parameters

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