Brooks P. Proctor David A. Lockner 2017 Menlo Park, CA USGS https://doi.org/10.5066/F7XP73WF Six time-series data files are included in this release. The files contain mechanical data (described below) collected during deformation experiments performed on obsidian gouge. A detailed description of the experiments along with the data reduction procedures are provided in the published manuscript: Proctor, B.P., Lockner, D.A., Lowenstern, J.B., and Beeler, N.M., 2017, Conversion of Wet Glass to Melt at Lower Seismogenic Zone Conditions: Implications for Pseudotachylyte Creep: Geophysical Research Letters, v. 44, no. 20, p. 10248–10255, https://doi.org/10.1002/2017GL075344. Experiments were performed to explore the behavior of glass in faults. 20170101 20170401 publication date Complete None planned A keyword thesaurus does not apply to this data. Glass, friction, pseudotachylyte, earthquakes USGS Metadata Identifier USGS:59dd4222e4b05fe04ccbda0a A keyword thesaurus does not apply to this data. none none none Brooks P. Proctor USGS mailing and physical

345 Middlefield Rd. MS 977

Menlo Park California 94025 USA 650-329-4840 bproctor@usgs.gov No formal attribute accuracy tests were conducted This does not apply. This does not apply. This does not apply. This does not apply. This does not apply. This does not apply. Experiments were performed in Menlo Park, CA. Point dr01data through wt03data results from experiments dr01, dr02, dr03, wt01, wt02, wt03 B. Proctor Time (s) Pcon (MPa) Axial Disp. (mm) Axial Stress (MPa) Diff. Stress (MPa) Shr Stress (MPa) Ef Nor. Stress (MPa) Ppore (MPa) Friction Coef. Temp C Pcon = Confining Pressure of the sample assembly Axial Disp. = Axial Displacement of a load point located outside the pressure vessel Diff. Stress = Differential Stress; Axial stress on the sample column minus the confining pressure Shr. Stress = Shear stress resolved on the sawcut fault surface and corrected for true contact area Ef Nor. Stress = Effective Normal Stress; Resolved normal stress, corrected for true contact area, minus the pore fluid pressure Friction Coef. = Friction coefficient; ratio of shear stress and effective normal stress Ppore = Pore pressure; water pressure measured outside the pressure vessel applied to the sample gouge zone Temp. = Temperature values measured near to top of the upper granite shearing piston which was ~2% cooler than the center of the sample shear zone. The experiments are described in more detail in the published manuscript Proctor, B. P., Lockner, D. A., Lowenstern,J. B., & Beeler, N. M. (2017). Conversionof wet glass to melt at lower seismo-genic zone conditions: Implications forpseudotachylyte creep. GeophysicalResearch Letters, 44, 10,248–10,255.https://doi.org/10.1002/2017GL075344 The data are the results from sensors during rock deformation experiments. The values depend on the time they were collected and the strength of the material. U.S. Geological Survey - ScienceBase mailing and physical

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Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Digital Data Set https://doi.org/10.5066/F7XP73WF None. No fees are applicable for obtaining the data set. 20200818 Brooks Proctor USGS mailing and physical

345 Middlefield Rd. MS 977

Menlo Park California 94025 USA 650-329-4840 bproctor@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998