West Coast/Alaska Tsunami Warning
Center
Operations Manual
NOAA/NWS/WCATWC
Palmer,
http://wcatwc.arh.noaa.gov
Section
4.1.14 – ANALYZE
Last
Updated: 5/2007
Date Written: 12/1997
Development Language: MicroSoft
C/C++ v7.0 using WinAPI
Initialization File:
analyze.ini - read on program
start-up
Program Description:
Program ANALYZE is a non-Earthworm-based program which runs independent
of any other seismic processing program.
Data files and semaphores are shared between ANALYZE and other programs,
but it is not dependent on any other program.
Its main function is to evaluate seismic data previously written to disk
file. disk_wcatwc logs data to disk in the format expected by ANALYZE. File
reads and writes are protected in both disk_wcatwc and ANALYZE so that ANALYZE
can access data files while disk_wcatwc is filling them with data. Data files
are named such that the file's time coverage can be determined from the file's
path and name. The file name contains the start time minute for all data in the
file. The first sample for each channel is the first sample at or after the
start minute listed in the file name. File length in time must be in whole
minutes (two minutes is normally used). Configurable options in ANALYZE are set
in file analyze.ini.
This disk logging approach works well where data comes from many
different sources. Most data is continuous, though some may be event-triggered.
Some data arrives with seconds latency, while others may be delayed several
minutes. Some data are saved at high sample rates while others are saved at low
rates. Regardless of how or when the data arrives, it is patched into the
proper location of a pre-created file. At any time after file creation, ANALYZE
has access to the data already logged in the file.
Program Controls:
The graphical interface and
program controls are very similar to module develo. Scrolling through the data is performed with
scroll bars or the mouse roller. As data from different files are needed, the
file is opened and read. When file time is near present, data is checked for
zeroes. If it appears that a channel has not been recorded yet, (possibly due
to a high latency) the file is re-read on the next scroll. In this way the latest
set of data should be read into memory.
Mouse buttons:
Right button on trace toggles trace display.
Right button on station name calls station manipulation menu (for trace scaling, station description, trace display on/off, P-picks
on/off).
Left button on trace sets P-time and Mb, Ml, and Mwp
magnitude information are determined when station sensitivity is known. LOCATE accesses this data through a shared
file.
Left button on station name eliminates the station
from the shared file with LOCATE.
Menu Options:
Most Recent: Display data with the left side of the screen set
four minutes prior to the present time.
New Quake: Call a dialog box which prompts for day and time to
display on left side of screen
Use Auto
Location: Display the time of the first P arrival of the
station set shown on the screen for the last located earthquake (i.e., the
quake shown in the SUMMARY screen).
Previous
Quakes: Call up a list box which
gives the last X automatic locations performed by loc_wcatwc.
Archive
Event: Copy disk files which cover
the last located event to an archive.
Data is saved from 2 to 4 minutes prior to the first P wave arrival to
30 minutes after the last Rayleigh wave arrival time.
Read
Archived Data: Retrieve previously
saved data from an archive.
Horizontal Scale: Change screen time scale.
Vertical Trace Scale - All: Change vertical scale for all stations.
Traces Per Screen: Number of traces vertically to show on the screen, rest will scroll.
Set Filter Parameters: Set cutoffs for SP/LP filters (defaults are normal
values used within program - changing parameters will cause incorrect
amplitude-to-ground motion conversions).
Core Stations: |
West Coast Stations:| The checked option is
the subset
Hawaiian Stations: | of stations shown on the screen.
Atlantic Stations: |
Worldwide Stations: |
Low Gain Stations: |
Display Filtered Data: Check -> screen shows SP/LP filtered signal for
broadband stations.
Display Broadband Data: Check -> screen shows unfiltered traces for all
stations.
Show Velocity Data: Trace is seismometer output.
Show Acceleration Data: Trace is differential of raw data.
Show Displacement Data: Trace is integral of raw data.
LP Screen: Toggle screen display with long period filtered
data.
Mwp: Set Max Window Time: Set the time of
integration and S:N manually for broadband stations (used with original Mwp method).
Display
Integrations: Show the integrated waveforms for all stations which could
compute an Mwp
Original
Method: Window length set by program or above menu option
Knight
method: Window length set by frequency content. Cannot be manually overridden.
Mb: |
Ml: | After
any of these are clicked, rubber-band the cycle
MS: | of
interest for magnitude computations
Process LP:
Using last location in dummy file, process LP disk data for MB/MS/Mw. After processing, the long period station
set is displayed with boxes around cycles used to
compute MS. The Mw spectral data is shown in a child window. The MS and Mw results are written to a file
shared with LOCATE.
Calibrate:
Use this option to calibrate analog WC/ATWC stations. Calibrations made on sine wave cals. Rubber-band the cals as in interactive
magnitude computations.
Xfer Ps: Update
screen and P-data with picks made in hypo_display or associated in loc_wcatwc.
Seismo:
When flagged, manual P-picks bring up a phase window.
ClipIt: Limit
trace amplitudes.
No Phase:
Do not overlay seismic phase data on screen
Show P Phase:
Overlay P, Pdiff, or PKP on data using IASPEI91 tables
Show Depth Phases: Overlay P Phases along with pP and sP phases
Show All Phases: Overlay all phases selected from IASPEI91 tables
Picks:
Make P-picks on initial data read
No P-picks: Do
Not make P-picks on initial data read (default)
Refresh: Re-paint the screen
ANALYZE is signaled from loc_wcatwc to re-draw the traces whenever
loc_wcatwc has computed an automatic 6-station location. The time of the first
P arrival is sent to ANALYZE as the signal. ANALYZE then displays this time in
the middle of the screen.