Checking the detected events in tracedisplay.

Visual event check

Tracedisplay can be used to access the events in the database and visualize the related data..

On this page

The tracedisplay can be used to navigate the events saved in the psysmon database.

Open the tracedisplay dialog

Load the display collection and open the tracedisplay preferences. Select the stations that have been used for the detection binding (MIT:XX:A, MOR:XX:A, PIL:XX:A and STO:XX:00).

The tracedisplay preferences with the stations selected for the event detection.
The tracedisplay preferences with the stations selected for the event detection.

Close the preferences dialog and execute the display collection to open the tracedisplay window. The tracedisplay window should show the seismograms of the 4 selected stations.

The tracedisplay window with the 4 selected stations.
The tracedisplay window with the 4 selected stations.

Open the event selector

The events can be browsed using the event selector plugin. Open it using the menu Display->show events. The event selector will open as a docking frame on the right side of the tracedisplay window. Resize it to better see the available parameters.

The event selector opens as a docking frame in the tracedisplay window.
The event selector opens as a docking frame in the tracedisplay window.

Load the events

In the event selector the events for a given time span can be loaded from an event catalog. Select 2018-10-25T00:00:00 for the start time and a window length of 86400 seconds. Select the event catalog tutorial and click the load events button. This will load all events detected on the day 2018-10-25. The events will be listed in the events table.

The events loaded for the day 2018-10-25.
The events loaded for the day 2018-10-25.

Select an event

Select the event with id 32 and start time 2018-10-25T22:57:31.938750. The time span of the displayed data will be changed to the event limits of the selected event. Zoom out to better show the event (click with the mouse into a seismogram view and use the shortcut - to zoom out).

The selected event shown in the tracedisplay. It is the earthquake that already was discussed when tuning the detection parameters.
The selected event shown in the tracedisplay. It is the earthquake that already was discussed when tuning the detection parameters.

The grey area marks the time limits of the detected event and the light red areas highlight the detections on the individual traces.

You can use the arrow keys in the events table of the event selector to browse through the detected events.

Another event example

Another interesting event is the event with the start time 2018-10-26T01:40:17. To view this event change the start time in the event selector to 2018-10-26T00:00:00 and click the load events button to reload the events. Then select the event with id 60 and start time 2018-10-26T01:40:17.041250 to show the event data.

Another example event shown in the tracedisplay window.
Another example event shown in the tracedisplay window.

This event is an interesting event recorded on the arrays MOR and PIL. To investigate the event on one array, open the station selector plugin by clicking the menu Display->select station and then selecting the stations MOR:XX:A, MOR:XX:B and MOR:XX:C in the event selector docking frame. Resize the docking frame to create more space for the data views.

The stations of array MOR shown using the station selector plugin.
The stations of array MOR shown using the station selector plugin.

This events looks like a rockfall candidate. Zoom in using the + key and navigate to the onset of the second, stronger signal of the event. One can see the differences of the arrival times of the waveform at the three array locations. Use the measure tool (shortcut M of menu Tools->measure point) to better highlight the time differences. Click and drag the mouse in the seismogram view to move the measure pointer. The data values are plotted in the view annotation area on the right side of the views.

Measure the arrival time differences of the example event. The measured data values are shown in the view annotation panel.
Measure the arrival time differences of the example event. The measured data values are shown in the view annotation panel.

Copyright © 2022 Stefan Mertl.

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If possible, please cite this article using the following form:
Psysmon Documentation, Sonnblick Events, "Visual event check", Stefan Mertl, 2022-08-27, www.mertl-research.at, licensed under CC BY-SA 4.0