West Coast/Alaska Tsunami Warning Center

Operations Manual

NOAA/NWS/WCATWC

910 South Felton Street

Palmer, Alaska 99645

http://wcatwc.arh.noaa.gov

Section 4.1.5 – hypo_display

Last Updated: 9/2010

Date Written: 3/2001
Development Language: MicroSoft C/C++ v7.0 using WinAPI

Necessary Rings:
Input Ring – HYPO_RING; reads TYPE_HYPOTWC format messages
Output Ring - PICK_RING; writes TYPE_PICKTWC format messages

Necessary Data Files:
StaFile - picker configuration file
StaDataFile - seismometer location, elevation, etc.
ResponseFile - Broadband instrument response in poles/zeroes format

RTPFile - P-data file to share wth WC/ATWC program LOCATE
QuakeFile - List of automatically located quakes
DiskWritePath and FileSuffix: - Disk data path and suffix

CityFiles – City names and locations that epicenters are referenced

Flinn-EngdahlFiles – Files controlling Flinn-Engdahl regions

Initialization File:
hypo_display.d - read on module start-up

Module Description:
This module takes hypocenter information (in TYPE_HYPOTWC format) from the Input Ring and displays it on a window. The module displays hypocenter information and waveforms on an easy to read and interact with display. Hypocenters computed in loc_wcatwc are matched with P-data files. The expected P-time for each channel listed in StaFile is computed, seismic data read from disk, and displayed in order of epicentral distance on a child window. P-picks used in the automatic location are shown on the seismic data display and can be altered interactively. P-picks which are changed or added are then sent back to the PICK_RING to update the P-buffer in loc_wcatwc. Future locations for this quake in loc_wcatwc will utilize the new and altered P-picks. As P-picks are changed or added here, Mb, Ml, and Mwp parameters are computed from the signal and reported with the P to PICK_RING.

Program Controls:
This module has a Windows graphical interface. Due to this interface, the module will only compile and run under Windows (NT, 2K, and XP). The display is broken into three sections. The top section lists the last MAX_QUAKES locations written to the InRing. Only the latest version of each is shown. Information is listed about each quake, such as: ID, version, O-time, date, lat, lon, depth, residual, azimuth, # stns., and magnitude data. When a quake is left-clicked, the quake's associated waveforms are shown below. This child window displays all waveforms for stations listed in StaFile ordered by epicentral distance with the expected P-time 25% from left to right of the child window. P-times are shown with red lines on this display. P's can be added or adjusted here by left-clicking on the trace, and the quake re-located either automatically by loc_wcatwc (if it is near real-time) or interactively in the module locate. Just above this box is a littoral location and preferred magnitude for the earthquake.

Mouse Buttons:

Left Button on top section list box displays appropriate traces in lower box.

Left Button in trace display window adjusts P-picks in file shared with LOCATE and with picks used in loc_wcatwc.

Left Button on station name in trace display window removes that station from further locations in loc_wcatwc and from the file shared with LOCATE.

Menu Options:

Force Location: Drops a “note” in PICK_RING so that loc_wcatwc will recompute location for quake being evaluated.

Mwp Display: Create child window to show integrated broadband signal used in Mwp computations.

Recompute Mwp: Specify maximum integration window and signal-to-noise ratio use in Mwp computations.

Hold: Prevent incoming quakes from updating screen.

Refresh: Re-paint the screen.