Transcript PQLX

Thurs Nov 12, 13:45
PQLX - A Station Assessment &
Data Quality Control System
Applications and Uses
Overview
PQLX System Technical Aspects
Software: Components, Installation and Setup
System Architecture: Server-Side Database & Client-Side GUI
Functional Aspects
Data Formats and Requirements
Analysis Statistics Computed by Server
GUI Functionality Provided by Client
Data Quality Control Possibilities
PDF Plots and Noise Feature Analysis
Future Developments
Technical Aspects
All Software Components Are Open-Source
Server-side Database - MYSQL
Client-side Database - gdb - GNU
Graphics Library - GTK+
FFTW - Fast Fourier Transform Library - MIT
miniSEED Data Reader, libmseed - IRIS DMS
evalresp - SEED Response File Reader - IRIS DMS/ISTI
TauP - Travel Time Calculation, algorithm - R. Buland & Chapman,
updated by B. Kennet
Multi-Platform: Linux, MAC OS, Solaris
Source code for PQLX is freely available for download via WWW
from:
http://www.iris.edu/software/pqlx/
Publicly Available, and Fully Searchable, Website for Bug
Reporting and Enhancement Requests:
http://wush.net/bugzilla/PQLX/describecomponents.
cgi?product=PQLX
Installation and Setup
External Software Dependencies
MYSQL - from http://mysql.org
PQL II (to resolve GTK+ dependency) from http://passcal.nmt.edu
Entire System Written in C (if travel time tables are used in
new version, you will need a fortran compiler)
Compilation and Installation via a single command- (scripted)
Provides Clear Indication of Success or Failure
PQLX Database created via:
Database Definition File
Script to read definition file and create database
System Architecture
Server-Side:
MySQL Instance Holds One or More PQLX Databases
pqlxSrvr - Server Process (one per database) Analyzes all
waveform data, uploading all Analysis Results to
Database:
Can be set up via cron for regularly scheduled
execution
Scalable - Number of CPUs to use Specified at
Execution Time- up to 4 currently
Re-runnable on Renewed Data - All statistics are
Replaced when Data is Updated with Newer Version
Scripts - Several Scripts are provided to manage the
database - ideally, there is no need to be directly involved
with MySQL itself
Client-Side:
GUI Access to a PQLX Database:
As a Local Database:
Client and Database Reside on the Same Machine
Client and Database Reside on Same Local
Network
As a Remote Database:
Client has Access to the Internet
Database Server is Visible on the Internet
Client Application is Fully Multi-Threaded for Efficiency
Purposes
Functional Aspects
Data Requirements
Data can be Provided in ANY of the Following Formats
(these also may be mixed within a single database instance):
miniSEED
SAC
SEGY
AH
nano
DR-100 -Spregnether
File Format is Auto-Detected, no Need to Explicitly Specify
File Definition is Read from Header, not File Name. Thus, no
Requirements for a Specific File Name Structure
Data can be Provided in Any Directory Tree Structure, Under
One or More Base Directories
Response File in rdseed Output Format, One Channel per File,
All Time Ranges
Server Constructs Database Contents Based on the Existence
of Data - New Station/Channel Data Can be Added At Any
Time...
Analysis Statistics
The PQLX Server is Responsible for Reading All Data/Trace
Files, Writing All Statistics to Database
Data File Statistics (Meta- and Computed):
Start and Stop Times
Length
Maximum / Minimum / Mean
Total Gaps: Their Locations and Length
Total Overlaps: Their Locations and Length
Channel Statistics:
First and Last Date of Existence of Data
Total Number of Traces
Trace Data Maximum - max / min / mean
Trace Data Minimum - max / min / mean
Trace File Gaps - max / min / mean
Trace File Overlaps - max / min / mean
Trace File View
Magnify View
Fourier Transform View
Simultaneous Data View
Header View
PDF/ PSD Viewer
Connection to Specific PQLX Database
Plot System PDFs Stored on Server-Side Database
Plot User-Defined PDF Based on Date and Time
Parameters
Sub-Select of PDFs Returning:
PDF of PSDs Intersecting User-Defined Sub-Selection
PSD Start Times and Durations
Trace Data Corresponding to PSD of Sub-Select, i.e.,
User is Able to go from Frequency Domain to Time
Domain
System PDF View
PDF Request View
PDF Detail View
STN (station) Viewer
Connection to specific PQLX Database
Bird’s-Eye View of Station/Channel Statistics & Data
Existence of Data
Gaps and Overlaps
Pop-Up Statistics and PDF Corresponding to Time
Period on Display
Configurable Display
Coverage Mode - Display vs. Database Info, i.e., no
Waveform Data. Thus, not Necessary to have Access
to Trace Files/Waveform Data Itself.
Data Mode - Waveform Data Display
(Configurable Display continued)
Display 1 - 60 days of data/statistics per screen
Display 1 - 36 channels per screen
Display only Specific Stations & Channels
Traversal in Time & Station/Channel List
STN Viewer - Coverage Mode
STN Viewer - Data Mode
In Development:
Event Record Sections
Align Waveform Data on Predicted Arrivals
Align Waveform Data on User Picks
Sort on Epicentral Distance
Simple Data Analysis
Integrate/Differentiate
Deconvolve Data - Remove Instrument Response
Cross-Correlation of Traces
As well as the GUI Client, Additional Client-Side
Functionality Includes:
Scripts to Extract PSD and PDF Data from the Database.
This allows the user to extract actual analysis data, either
PSD or PDF format, done by specifying date and time
bounding parameters for their own specific use.
Data Quality Control &
Station Assessment
The following aspects of Data Quality Control are Possible to
Manage and Identify with PQLX, i.e., WHAT:
Overall Station Performance
Channel Data Existence Displayed in STN viewer
Identify Instrument Problems
Gaps and Overlaps
Displayed in STN viewer: Identify Data
Transmission Problems, e.g., Data Dropouts,
Telemetry Issues, etc.
Displayed in PDF Plot:
Station Performance
Meta-Data Accuracy
Bad Response File Information Visible in PDF Plots
Bad Units
Acceleration Instead of Velocity
Input Units
Extra Zero in Response File
Results in Tilted PSD:
Low Amps at Low Period
High Amps at High Period
Corrected Response
Bad Units
Displacement Instead of
Velocity Input Units
Missing zero in Response File
Results in Tilted PSD:
High Amps at Low Period
Low Amps at High Period
Corrected Response
Bad STS2 Gain
Used 20,000 counts/volt
Instead of 1500 counts/volt
Resulting in low corrected
Amplitude across spectrum.
Corrected Response
Noise Feature Analysis
Selection of Noise Feature in PDF Viewer Detail Screen
Precise Date and Times of Occurrence
Waveform (Time Domain) Display of PSD
Diurnal Variations
Earthquakes
Rogue Waves
Nuclear Tests
Quality can be Controlled in the Following Ways:
Daily Inspection and Perusal of Database Contents via
GUI Application
Automatic Publication of Server-Side PDF Plots to the
WWW as Part of the PQLX Server’s Execution
Future: User-Defined Triggers/Alerts Automatically
Generated when PQLX Server Uploads Statistics, e.g.:
Maximum Gap Threshold
PSD Value Out-Of-Range (vs. HNM/LNM)
PSD Value Within a Specific Range (vs. user-defined
attribute)
Missing Data
Data Gaps
Mass Re-Centering
Future Developments
The following functionality is being Considered for Future
Development:
PDF Animations – DONE!
More Advanced Data Analysis
For example Particle Motion
Server and Database Management via Client-Based
GUI Interface
Normal Operating Bounds definition specific to
Channel, i.e., a station/channel-specific HNM and
LNM
User-defined Noise Feature, e.g., PSD is above HNM
Automatic Noise Feature Detection against User
Definitions and Reporting, e.g., alert when PSD
produces data in a specific noise and frequency range
Credits
The following Organizations (listed alphabetically), Through
Direct and Indirect Funding, have made this Software
possible:
IRIS - Data Management Center, Seattle, WA
IRIS - PASSCAL Instrument Center, Socorro, NM
National Science Foundation, Washington, D.C.
United States Geological Survey - Golden, CO
END