August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Seismic Quality AssuranceSeismic Quality Assurance

Rick BensonIRIS DMC

Rick BensonIRIS DMC

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Why Routine Quality Control ?

Why Routine Quality Control ?

The sooner problems are detected the sooner they can be fixed

• Sensor malfunctions, misconfigurations, aging

• Digitizer & recorder malfunctions• Vault problems: tilting, settling, etc• Cable & connection problems• Telemetry issues• Timing problems• Many, many other potential issues

The sooner problems are detected the sooner they can be fixed

• Sensor malfunctions, misconfigurations, aging

• Digitizer & recorder malfunctions• Vault problems: tilting, settling, etc• Cable & connection problems• Telemetry issues• Timing problems• Many, many other potential issues

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

QC at the IRIS-DMCQC at the IRIS-DMCThe Challenge:

A small number of analysts tasked to perform QC on hundreds of stations and thousands of channels (without routine event review).

The Solution:Minimize manual analyst work (obviously) by automating as many measurements and monitoring systems as possible and making manual analysis as efficient as possible.

The Challenge: A small number of analysts tasked to perform QC on hundreds of stations and thousands of channels (without routine event review).

The Solution:Minimize manual analyst work (obviously) by automating as many measurements and monitoring systems as possible and making manual analysis as efficient as possible.

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Manual QC at the DMCManual QC at the DMC• Visual review of raw data for selected events and,

importantly, selections with no events• Visual review of filtered (e.g. 30-300 seconds) data

where sensor problems can sometimes be detected before they are evident in the unfiltered data

• Polarity checks using large events and the quadrant method

• Check residuals between reviewed phase picks and predicted arrivals for gross time or location errors

• Review of measurements and alerts from automated systems

• Etc.

• Visual review of raw data for selected events and, importantly, selections with no events

• Visual review of filtered (e.g. 30-300 seconds) data where sensor problems can sometimes be detected before they are evident in the unfiltered data

• Polarity checks using large events and the quadrant method

• Check residuals between reviewed phase picks and predicted arrivals for gross time or location errors

• Review of measurements and alerts from automated systems

• Etc.

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Quick Horizontal Polarity Check

Quick Horizontal Polarity Check

The “quadrant method” allows an analyst to perform a rough check of3-component sensor horizontal polarity.

Compare the P wave first motion of a relatively large event between the 3 components to determine back azimuth:

The “quadrant method” allows an analyst to perform a rough check of3-component sensor horizontal polarity.

Compare the P wave first motion of a relatively large event between the 3 components to determine back azimuth:

0º

90º

180º

270º

N out Z out

E outAll in phase

* Assumes Z component polarity is correct.* Assumes Z component polarity is correct.

Aleutian Island event :: Texas, USA station (BA: ~317°)

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Automated QC at the DMCQuality Analysis Control Kit

(QUACK)

Automated QC at the DMCQuality Analysis Control Kit

(QUACK)

• Automated QC measurements for incoming real-time data at the DMC

• Tracks a number of simple parameters (signal RMS, mean, gaps, overlaps, etc.) in addition to more complicated analyses (PSD/PDF, STA/LTA)

• Generates daily reports, using thresholds to control what information is included in the report in order to reduce the number of issues that need attention

• Automated QC measurements for incoming real-time data at the DMC

• Tracks a number of simple parameters (signal RMS, mean, gaps, overlaps, etc.) in addition to more complicated analyses (PSD/PDF, STA/LTA)

• Generates daily reports, using thresholds to control what information is included in the report in order to reduce the number of issues that need attention

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Tracking Signal RMSTracking Signal RMS

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Daily RMS Indicates Problems

Daily RMS Indicates Problems

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Tracking Signal MeanTracking Signal Mean

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Tracking Data FlowTracking Data Flow

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Tracking STA/LTA ValuesTracking STA/LTA Values

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

PDF of Power Spectral Density

PDF of Power Spectral Density

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Clickable PDFs to Find Time Dependencies

Clickable PDFs to Find Time Dependencies

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

PDF CalculationPDF Calculation• Current implementations require Mini-SEED and

SEED (RESP) system response information

• PDF calculation available in the new PQLX analysis package

• An older stand-alone PDF package is available:

http://geohazards.cr.usgs.gov/staffweb/mcnamara/Software/PDFSA.html

• PDFs calculated daily for real-time data received at the IRIS-DMC, stored in database

• Current implementations require Mini-SEED and SEED (RESP) system response information

• PDF calculation available in the new PQLX analysis package

• An older stand-alone PDF package is available:

http://geohazards.cr.usgs.gov/staffweb/mcnamara/Software/PDFSA.html

• PDFs calculated daily for real-time data received at the IRIS-DMC, stored in database

Nov 8-17, 2009 Data Management Workshop Foz do Iguassu- Brazil

Tide AnalysisTide Analysis• Primary gravitational tides are predictable• Most seismic sensors are not designed for such low frequencies

& response information may not address them• Pretty much only a true broadband sensor will record the tides

The idea: compare recorded seismic data to predicted gravitational tides

• Tests both waveform data (polarity, shape) and metadata (instrument response)

• Primary gravitational tides are predictable• Most seismic sensors are not designed for such low frequencies

& response information may not address them• Pretty much only a true broadband sensor will record the tides

The idea: compare recorded seismic data to predicted gravitational tides

• Tests both waveform data (polarity, shape) and metadata (instrument response)

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Tide Comparison at IU.SAMLTide Comparison at IU.SAML

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Tide Comparison at TA.H02A

Tide Comparison at TA.H02A

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Tide Comparison at PR.ICMTide Comparison at PR.ICM

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Tide Comparison Without Response Information

Tide Comparison Without Response Information

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Tide Prediction SoftwareTide Prediction Software

• syntides - Synthetic Earth Gravity Tides (IRIS-DMC)• Output: Mini-SEED, SAC or ASCII tide synthetics• Convolves instrument response (SAC format)• Tide calculation a port of the SPOTL ‘ertid’ program

• SPOTL - Some Programs for Ocean-Tide Loading• Output: ASCII text• Includes software to calculate solid earth gravity tide,

ocean loading components, etc.• Written by Duncan Agnew, UCSD

• syntides - Synthetic Earth Gravity Tides (IRIS-DMC)• Output: Mini-SEED, SAC or ASCII tide synthetics• Convolves instrument response (SAC format)• Tide calculation a port of the SPOTL ‘ertid’ program

• SPOTL - Some Programs for Ocean-Tide Loading• Output: ASCII text• Includes software to calculate solid earth gravity tide,

ocean loading components, etc.• Written by Duncan Agnew, UCSD

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

SEED Metadata VerficationSEED Metadata Verfication

verseed - verifies base SEED data structure and formatting (IRIS-DMC)

• Works with full SEED, dataless and Mini-SEED combined with dataless SEED (verseed -a)

• Includes multiple levels (1-4) of diagnostic information

• Basic metadata verification but not response evaluation

• C program that runs on Solaris, Linux and Mac OSX

verseed - verifies base SEED data structure and formatting (IRIS-DMC)

• Works with full SEED, dataless and Mini-SEED combined with dataless SEED (verseed -a)

• Includes multiple levels (1-4) of diagnostic information

• Basic metadata verification but not response evaluation

• C program that runs on Solaris, Linux and Mac OSX

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

verseed example outputverseed example output

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Other verseed ExamplesOther verseed Examples

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

SEED Response EvaluationSEED Response Evaluation

evalresp - evaluates system amplitude and phase response using SEED RESP format. C program that runs on Solaris, Linux & Mac OSX.

JEvalResp - Java version of evalresp, runs anywhere Java is available. Reads either SEED RESP format or fetches response information from a DHI server.

JPlotResp - evaluates and plots system amplitude and phase response using SEED RESP format. Reads either SEED RESP format or fetches response information from a DHI server.

evalresp - evaluates system amplitude and phase response using SEED RESP format. C program that runs on Solaris, Linux & Mac OSX.

JEvalResp - Java version of evalresp, runs anywhere Java is available. Reads either SEED RESP format or fetches response information from a DHI server.

JPlotResp - evaluates and plots system amplitude and phase response using SEED RESP format. Reads either SEED RESP format or fetches response information from a DHI server.

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

JPlotResp UsageJPlotResp Usage

August 13-19, 2010

Data Management Workshop Foz do Iguassu- BrazilData Management Workshop Foz

do Iguassu- Brazil

JPlotResp ConsoleJPlotResp Console

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

JPlotResp OutputJPlotResp Output

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

JPlotResp Output Per StageJPlotResp Output Per Stage

August 13-19, 2010

Data Management Workshop Foz do Iguassu- Brazil

Other Quality Control Resources

Other Quality Control Resources

• QC Forum collaborative web site:

http://www.iris.edu/QCForum

• General use QC mailing list:

qc-issues@iris.washington.edu

• New Manual of Seismological Observatory Practice (NMSOP) from IASPEI:

http://www.gfz-potsdam.de/bib/nmsop_formular.html

• PQLX data analysis system (waveforms & PDFs):

http://geohazards.cr.usgs.gov/staffweb/mcnamara/Software/PQLX.html

• QC Forum collaborative web site:

http://www.iris.edu/QCForum

• General use QC mailing list:

qc-issues@iris.washington.edu

• New Manual of Seismological Observatory Practice (NMSOP) from IASPEI:

http://www.gfz-potsdam.de/bib/nmsop_formular.html

• PQLX data analysis system (waveforms & PDFs):

http://geohazards.cr.usgs.gov/staffweb/mcnamara/Software/PQLX.html