Strainmeter Short Course Materials

These materials are presented for reference as created for a short course at the 2018 UNAVCO Science Workshop in Broomfield, CO.

Software List

• GMT5, for plotting the data
• Software to view the GMT plots, e.g., Ghost Script. Mac users can install Ghost Script using macports or use Preview, a built in application on a Mac.
• Baytap08: Tidal Analysis Software: We will be using the BAYTAP08 software to analyze the tidal signals, estimate the barometric response and isolate strain signals. This software requires a Fortran complier. I will provide pre-compiled binaries for Mac and Linux users during the class.
• A text editor such as vi, emacs or brackets to edit scripts.
• Optional: RStudio

Useful Documents

• PBO (now NOTA) SEED Codes
• Strainmeter Processing Overview
• Baytap 08 User Manual
• Description of the GTSM21 Strainmeter Data format and file structure
• Summary of GTSM Data Timing Conventions
• Description of the Level 2 Processed Strainmeter Data XML format

Presentations from the Short Course

• Introduction to Strain and Strainmeter Data (Evelyn Roeloffs)
• Accessing Strainmeter Data and Metadata Part 1, Part 2 (Kathleen Hodgkinson)
• Noise and Strain (Duncan Agnew)
• Assessing Strainmeter Data Quality (Kathleen Hodgkinson)
• Analyzing Strainmeter Signals (Evelyn Roeloffs)
• Isolating tectonic signals with BAYTAP-08 (Kathleen, Duncan, Evelyn)

Suggested Reading List

• Dragert, H., and K. Wang (2011), Temporal evolution of an episodic tremor and slip event along the northern Cascadia margin, J. Geophys. Res., 116, B12406, doi:10.1029/2011JB008609.
• Gladwin, M. T., High precision multi component borehole deformation monitoring, Rev. Sci. Instrum., 55, 2011–2016, 1984.
• Hart, R. H. G., M. T. Gladwin, R. L. Gwyther, D. C. Agnew, and F. K. Wyatt (1996), Tidal calibration of borehole strain meters: Removing the effects of small-scale inhomogeneity, J. Geophys. Res., 101(B11), 25553-25571, doi:10.1029/96JB02273.
• Hodgkinson, K., J. Langbein, B. Henderson, D. Mencin, and A. Borsa (2013), Tidal calibration of plate boundary observatory borehole strainmeters, J. Geophys. Res. Solid Earth, 118, 447-458, doi:10.1029/2012JB009651.
• Linde, A. T., M. T. Gladwin, M. J. S. Johnston, R. L. Gwyther, and R. G. Bilham (1996), A slow earthquake sequence on the San Andreas Fault, Nature, 383, 65-68, doi:10.1038/383065a0.
• Roeloffs, E. (2010), Tidal calibration of Plate Boundary Observatory borehole strainmeters: Roles of vertical and shear coupling, J. Geophys. Res., 115, B06405, doi:10.1029/2009JB006407.
• Y. Tamura, T. Sato, M. Ooe, M. Ishiguro (1991), A procedure for tidal analysis with a Bayesian information criterion, Geophysical Journal International, Volume 104, Issue 3, Pages 507–516.
• A list of strainmeter-related literature can be found here.