Purpose

This panel is intended to initialize a source from the Global CMT Catalog.

An example involving this panel can be found in the tutorial.

Technical Note

Given the high number of parameters to set for a seismic source, this panel allows to initialize it the Global Centroid Moment Tensor Catalog. To To exploit this functionality it is just necessary to know the CMT code related to an event; this code can be found through the search page of the Global CMT Catalog; putting the code into the "Insert the CMT identifier", then 'SEARCH' button, the software will retrieve all the event information and populate the source parameter with the proposed values. Strike, Dip, Rake are directly taken from CMT, while length, width and slip are derived using the Wells and Coppersmith [1994] relationships.

When this panel is invoked from Non-Linear inversion section, the upper and lower limits of the allowed values for every parameter is also proposed, according to the parameter standard deviation derived with the Wells and Coppersmith rules.

In any case, the user should verify the reliability of the source initialization.

The following are examples of CMT indentifiers:

200904060132A - Mw 6.3 L'Aquila, central Italy, earthquake (06/04/2009).

201103110546A - Mw 9.1 Great Japan earthquake (11/03/2011).

201102212351A - Mw 6.1 Christchurch, New Zealand, earthquake (21/02/2011).

Note: CMT catalogue provides the double solution corresponding to the alternative focal planes; discriminating the real and the auxiliary solution is in charge of the user. This choice can be done through a pull-down menu.

Input Parameter(s)

CMT identifier

Event code retrieved from the CMT catalog (see the Technical Note).

General Functions

Commit

Set the parameters in the Elastic Dislocation panel.

Cancel

The window will be closed.

Help

Specific help document section.

Specific Function(s)

CMT source - plane 1/ CMT source - plane 2

Select the desired focal plane, between the two alternatives.

Add a source to invert / Add as fixed source

This option is available only in the inversion panels and to set whether the source is added as source to be defined by inversion or just contributing to the displacement as fixed source (see here in Elastic dislocation)

References

Wells, D.L and K.J. Koppersmith (1994), New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement, Bull. Seism., 84 (4), 974-1002.

Initialize Values from CMT Catalog

Initialize Values from CMT Catalog

Purpose