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PBO Strainmeter Products

PBO Strainmeter Products. Strainmeter Short Course Earthscope Meeting May 12, 2009. PBO Web Page. MAPS. http://pboweb.unavco.org. PBO Network Map. PBO Network Map. PBO Network Map. Strainmeter Homepages. Strainmeter Homepages. Strainmeter Homepages. Strainmeter Homepages.

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PBO Strainmeter Products

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  1. PBO Strainmeter Products Strainmeter Short Course Earthscope Meeting May 12, 2009

  2. PBO Web Page MAPS http://pboweb.unavco.org

  3. PBO Network Map

  4. PBO Network Map

  5. PBO Network Map

  6. Strainmeter Homepages

  7. Strainmeter Homepages

  8. Strainmeter Homepages

  9. Strainmeter Homepages

  10. Strainmeter Homepages

  11. Strainmeter Homepages

  12. What is recorded at a PBO BSM site? • Strainmeter • Seismometer • Barometer • Rainfall gauge • Temperature sensor

  13. What is recorded at a PBO BSM site? • Strainmeter • Seismometer • Barometer • Rainfall gauge • Temperature sensor • Tiltmeter • GPS • Accelerometer • Pore pressure sensor

  14. What is recorded at a PBO BSM site?

  15. Strainmeter Dataflow • SEED • The data are translated to miniSEED by PBO • Transferred to NCEDC and IRIS DMC via SEEDLink • Data downloaded from logger oh hourly basis • ASCII • Low frequency bottle data also translated to ASCII and made available from PBO web site Strainmeter Logger UNAVCO Convert to mSEED Collect bottle files Updated every hour Updated every day UNAVCO - BSMAC Monitor dataflow, quality Track metadata, archiving Process data Updated every 2 weeks

  16. The PBO Strainmeter Page A master list of all PBO strainmeter data sets is displayed on the PBO strainmeter products web page . http://pboweb.unavco.org/strain_data

  17. Raw Data: All sample rates Archived at the DMC and the NCEDC • SEED format • Bottle format: 24-hour long files

  18. Raw Data: Low Frequency UNAVCO provides: • Bottle format: Long-term merged data • ASCII format: Long-term merged ASCII data

  19. Processed Data Processed Strainmeter data • Gauge, areal and shear strain • Edits • Tidal Correction • Barometeric Pressure Correction • Borehole Trend Correction

  20. Processed Data

  21. Processing Steps 1 sps data Decimate, linearize 300s data Remove predicted signals Remove borehole trend, tides, barometric pressure - edits record Edit data

  22. Processing Steps 1 sps data 300s data Decimate, linearize Apply edits 300s data Generate borehole trend, tides, baro corrections Remove predicted signals Remove borehole trend, tides, barometric pressure - Generate areal, shear strain edits record Edit data Level 2 XML

  23. Processing Steps 1 sps data 300s data Decimate, linearize Apply edits 300s data Generate borehole trend, tides, baro corrections Remove predicted signals Remove borehole trend, tides, barometric pressure - Generate areal, shear strain edits record Edit data Level 2 XML

  24. Processed Strainmeter Data Two categories of processed data: • 2a: Rapidly processed data set Updated every 14 days • 2b: Post-processed data set Trends and tides recalculated Models updated every 4 months

  25. ut = * R M dt/(1e+8) 1-(dt/1e+8) do/(1e+8) 1-(do/1e+8) Step 1. Decimate , Linearize • SEED and bottle data are in digital counts. • The linear gauge strain, u, at time t, is calculated with respect to a fixed raw data point (do) . dt raw data value at time t R instrument reference gap (0.01 or 0.02 cm) M instrument diameter (0.087 m)

  26. Step 2. Edit • Inspection of 100% 1-sps strain data • Flag signals known to not be tectonic • Use PIASD to estimate offset - moving to cleanstrain+ • Edit low frequency barometric data

  27. 2. Editing Step 2. Edit B007, Shores, WA Counts CH0CH1CH2CH3

  28. 2. Editing Step 3. Detrend • Current Method • Trends are modeled by fitting a linear term plus one to two exponentials to the data Goals • Transparency • Repeatability

  29. Step 3. Detrend B087, Ford Ranch, Anza Installed June 2006

  30. Step 3. Detrend B087, Ford Ranch, Anza ch2=10.758+30.294*exp(-0.00925*t)-0.043*t microstrain microstrain CH2 Model CH2 April 4, 2007 Days since install Days since install

  31. Step 3. Detrend B087, Ford Ranch, Anza ch2=10.758+30.294*exp(-0.00925*t)-0.043*t microstrain CH2 Model July 13, 2007 Days since install

  32. Step 3. Detrend B087, Ford Ranch, Anza ch2=10.758+30.294*exp(-0.00925*t)-0.043*t ch2=12.519+36.327*exp(-0.00681*t)-0.025*t microstrain microstrain CH2 Model Updated Model July 13, 2007 Days since install Days since install

  33. Step 4. Tides a. Input linearized edited data to BAYTAP-G - Estimate amplitude and phase of tides b. Compute time series correction using PIASD - Uses output from BAYTAP-G

  34. Step 4. Tides Tide removed Edited Gauge Data BAYTAP-G PIASD Correction microstrain B081 Keene Wilde Anza B081 Keene Wilde Anza

  35. Step 5. Barometric Correction • Assume strain change linearly related to barometric pressure change • Estimate simultaneously with tides using BAYTAP-G

  36. Step 5. Barometric Correction Pressure removed Edited Gauge Data BAYTAP-G Response Coefficient microstrain B081 Keene Wilde Anza

  37. g0u0 g1u1 g2u2 g3u3 cos20 sin20 1 cos21 sin21 1 cos22 sin22 1 cos23 sin23 1-2 C 0 0 0 D 0 0 0 D Enn + Eee Enn - Eee 2Een = Step 6. Areal and shear strain ui linearized gauge readings gi gauge weightings ( currently 1)  orientation of gauge counter-clockwise from east C areal scale factor ( currently 1.5) D shear scale factor ( currently 3)

  38. Processed Strainmeter Data • Processed data are stored in XML format (ASCII). • XML files are human and machine readable. • Allows description of the data within the file. • Provides reproducibility of the processed data

  39. Processed Strainmeter Data 2007 2008 2a data Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep B004.2007.2008007071250 B004.2008.2008020071250 B004.2008.200803671250 2b data B004.2008.200804671250

  40. Processed Strainmeter Data 2007 2008 2a data Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep B004.2007.2008007071250 B004.2008.2008020071250 B004.2008.200803671250 2b data B004.2008.200804671250 B004.2007.2008061071250 2b data

  41. Processed Strainmeter Data 2007 2008 2a data Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep B004.2007.2008007071250 B004.2008.2008020071250 B004.2008.200803671250 2b data B004.2008.200804671250 B004.2007.2008061071250 B004.2008.2008061071250 B004.2008.2008061241250 B004.2008.2008159121220 2b data B004.2007.2008061151250 B004.2008.2008062001250 2b data B004.2008.2008062131432

  42. Processed Strainmeter Data • PBO strain XML files contain, • General strainmeter information • Sensor information • Processing information • Processed data.

  43. Processed Strainmeter Data • <bsm_processing> • <timeseries_start_date>2005-10-04T00:00:00</timeseries_start_date> • <timeseries_end_date>2006-02-09T23:55:00</timeseries_end_date> • <linearization> • <gage_weightings> • <orientation_matrix> • <areal_and_shear_factors> • <topography> • <atm_pressure unit="microstrain_per_millibar"> • <tidal_parameters> • <detrend_g0 > • <detrend_g1 > • <detrend_g2 > • <detrend_g3 > • <decimate_by_two_filter> • <decimate_by_three_filter> • <decimate_by_five_filter> • </bsm_processing>

  44. Processed Strainmeter Data • The most recent XML file is named BBBB.YYYY.xml.bz2 (enables download via cron) • Flat ASCII version of most recent processed data set available from UNAVCO

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