Alan Jones, SUNY Binghamton
January 19, 2000
Seismic/Eruption is a Windows program which shows seismicity in speeded-up time. It has a database of earthquakes and volcanic eruptions from 1960 to near the present. Via QDDS (Quake Data Distribution System) and QDM (Quake Data Merge), you can keep the database up-to-date to within a few minutes or a few hours. You must use a PC attached to the Internet running Windows 95, 98, or NT.
QDDS is used to send earthquake information in near-real time from seismic networks to QDDS hubs. The hubs send these events to attached leaves. One problem with this is that the same event may be sent from more than one network, particularly if the event is near the border of network's region. QDM solves this problem by using a set of criteria to created a merged catalog.
This application uses the merged catalog, a file called merge.nts, to update Seismic/Eruption's database. After an event is used by QDM it is sent to Seismic/Eruption where, if it is above a user-setable threshhold, it is displayed on the screen and a banner is displayed at the top which contains the event's parameters: date, time, latitute, longitude, depth, magnitude.
The run time environment allows you to run Java programs but not compile them from source code. If you think you will be modifying the Java code, you will need the Java Development Kit which is also available from the Sun Web site.
Look for seisvole.exe and do a default installation. If you already have Seismic/Eruption, the new version can be installed "over" the older version.
Run Seismic/Eruption to make sure things are okay. To verify that Seismic/Eruption can find things on the Internet, try to update the hypocenter databases:
Options/Update hypocenters via Internet
This should bring your hypocenter databases up-to-date to within the last hour or so.
Archive file: ALL.TXT (Logged events go here)
Default hypocenter file: WORLD.HY4
Default magnitude alert threshold: 2.0 (or whatever)
Alert Window: 24 hours (or whatever)
(Set the directory where Seismic will look for the merged file)
(Now set the poll directory where Seismic will look for individual events:)
Don't worry about forward slashes vs backward slashes. Java takes care of this according to what system it is on.
Alive message # 11042 from qdds1.wr.usgs.gov
When an event arrives, you'll see a message something like:
14:41:40: msg # 11043 from
Check to see if the events are ending up in the QDM\polldir directory. If they are, you can start up QDM.
There are lots of controls in Seismic under Control to alter the speed of the display or do make it loop. You might want to use Control/Set Dates and put a loop time like 90 days in there to keep it looping over the last 90 days.
Although the above description tells how to run QDDS and QDM together to receive recent events as alerts and to update the database with duplicates removed, you can run QDDS by itself and make its output directory Seismic/Eruption's polldir. Likewise, if you don't want the alerts appearing on the screen, but do want the database updated, just turn off the poll directory on the Seismic/Eruption Alert/Poll Directory.