Effects of frictional properties of quartz and feldspar in the crust on the depth extent of the seismogenic zone

Masuda, Koji; Arai, Takashi; Takahashi, Miki

doi:10.1186/s40645-019-0299-5

Progress in Earth and Planetary Science

Table 1 Experimental conditions and results

From: Effects of frictional properties of quartz and feldspar in the crust on the depth extent of the seismogenic zone

Run ID	Mineral	Average grain size	Dry/wet^a	T (°C)	Coefficient of friction, μ	Error^b μ	a – b	Error^b a – b	Load cell^c data used
QCD020	Quartz	250 μm	Dry	20	0.6006	0.0014	− 0.00034	0.00008	I
QFD200	Quartz	5 μm	Dry	200	0.6641	0.0045	0.00093	0.00005	I
QCD200	Quartz	250 μm	Dry	200	0.5502	0.0003	0.00265	0.00007	I
QFD300	Quartz	5 μm	Dry	300	0.6213	0.0040	0.00490	0.00004	I
QFD400	Quartz	5 μm	Dry	400	0.6395	0.0048	0.00193	0.00007	I
QCD400	Quartz	250 μm	Dry	400	0.6497	0.0004	0.00560	0.00006	I
QCD600	Quartz	250 μm	Dry	600	0.6666	0.0008	0.00562	0.00013	I
QFW100	Quartz	5 μm	Wet	100	0.6555	0.0044	0.00421	0.00003	O
QFW200	Quartz	5 μm	Wet	200	0.6254	0.0040	0.00132	0.00005	I
QFW300	Quartz	5 μm	Wet	300	0.6718	0.0046	− 0.00122	0.00003	I
QFW350	Quartz	5 μm	Wet	350	0.6383	0.0056	0.00956	0.00003	O
QFW400	Quartz	5 μm	Wet	400	0.6741	0.0008	0.00983	0.00011	O
QFW500	Quartz	5 μm	Wet	500	0.6983	0.0012	0.01144	0.00007	O
QFW600	Quartz	5 μm	Wet	600	0.6712	0.0014	0.00453	0.00011	I
FD020	Feldspar	50 μm	Dry	20	0.6444	0.0062	0.00184	0.00009	I
FD100	Feldspar	50 μm	Dry	100	0.6682	0.0016	0.00309	0.00005	O
FD200	Feldspar	50 μm	Dry	200	0.6567	0.0066	0.00070	0.00021	I
FD300	Feldspar	50 μm	Dry	300	0.6562	0.0058	0.00173	0.00013	I
FD350–1	Feldspar	50 μm	Dry	350	0.6673	0.0004	0.00186	0.00009	I
FD350–2	Feldspar	50 μm	Dry	350	0.5314	0.0003	0.00152	0.00007	I
FD400	Feldspar	50 μm	Dry	400	0.6427	0.0061	0.00591	0.00042	I
FD600	Feldspar	50 μm	Dry	600	0.6313	0.0063	0.00142	0.00036	I
FW100	Feldspar	50 μm	Wet	100	0.6819	0.0054	0.00236	0.00003	O
FW200	Feldspar	50 μm	Wet	200	0.7590	0.0027	− 0.00495	0.00014	I
FW250	Feldspar	50 μm	Wet	250	0.6919	0.0058	− 0.00614	0.00005	O
FW300–1	Feldspar	50 μm	Wet	300	0.6516	0.0079	− 0.01304	0.00041	I
FW300–2	Feldspar	50 μm	Wet	300	0.6501	0.0064	− 0.00870	0.00047	I
FW350	Feldspar	50 μm	Wet	350	0.7285	0.0064	0.00435	0.00098	O
FW400	Feldspar	50 μm	Wet	400	0.7016	0.0039	0.00498	0.00028	O
FW600	Feldspar	50 μm	Wet	600	0.7080	0.0005	0.00455	0.00007	I

^aFor the dry experiments, a confining pressure of 150 MPa was applied by using Ar gas; for the wet experiments, a confining pressure of 200 MPa was applied, with pore-water pressure of 50 MPa
^bThe errors of coefficients of friction μ at the yield point (at displacement of 1.5 mm in this study) and (a – b) were determined by the fitting errors
^cThe differential stress on the gouge layer was measured by the internal load cell (I), but for cases where no internal load cell data were available, we used the corrected data of the external load cell (O), see main text for details of this correction

Back to article page