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Glossary

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Glossary

Event

An event is a SeisComP3 object created by scevent from origin objects. It contains all information also contained in the origins such as source location, source time, arrivals and magnitudes. In SIGMA, data processing is triggered based on existing events. Events can be imported directly from the SeisComP3 database or from external FDSN web services. For importing events into SIGMA use the Tools menu.

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Figure 3: Event import in SIGMA.

Incident

An incident is an object be derived from any type of event for which a hypocenter and a magnitude has been determined. Incidents contain the event parameters and additionally the parameters calculated by SIGMA. The internal incident can be exported to the SIGMA database. For exporting incidents use the File menu.

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Figure 4: Incident list in SIGMA.

Distance measures

In SIGMA we make use of distance measures commonly used on seismology.

Epicentral distance

The epicentral distance is defined as the shortest distance from a seismic station or any other site to the epicentre of the seismic event.

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Figure 5: Epicentral distance.

Hypocentral distance

The hypocentral distance is defined as the shortest distance from a seismic station or any other site to the hypocentre of the seismic event.

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Figure 6: Hypocentral distance.

Rupture distance

The rupture distance is defined as the shortest distance from a seismic station or any other site to the rupture surface of the seismic event.

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Figure 7: Rupture distance.

Joyner-Boore Distance

The Joyner-Boore distance is defined as the shortest distance from a seismic station or any other site to the surface projection of the rupture surface of the seismic event.

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Figure 8: Joyner-Boore distance.