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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/weta T (°C) Coefficient of friction, μ Errorb μ a – b Errorb a – b Load cellc 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
  1. 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
  2. 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
  3. 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