source: misc/tools/event_selection/find_faullt/readme.txt @ 7379

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Documentation describing methodology for

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1Methodology for using
2Jonathan Griffin
318 August 2009
5This script is used to find an event for a given geographic location of the source earthquake. It relies on the Event Selector by Ross Wilson.
71: Identify the maximum and minimum latitude and longitude of the fault that you want to find.
8For example this may be to find approximate an historical event.
102: Deaggregate some events using the Event Selector near the community you are interested in modelling.
11Use a large range of possible wave amplitudes, e.g. 0.01 - 15.0 m. The Event Selector will generate a file fault.xy.
12This file contains that coordinates of all the events found by the Event Selector
143: Edit to:
15        Specify the max/min latitude and longitude of the earthquake you are trying to approximate.
16        Specify the search tolerance, in degrees, defining what you consider close enough to the search coordinates.
17        Specify the directory that fault.xy is located in. Output will be a file called possible_quakes.txt in the same directory.
194: Run
215: A list of earthqaukes that fit the search parameters will be produced in possible_quakes.txt.
22Use this list to then look back through the list in the event selector to find events of the right magnitude and/or slip.
246: To visually check the results, change the extension of fault.xy to fault.txt then add into an ArcMap session.
25Display xy data, then go into Properties -> Definition Query, where you can define a query based on quake_ID
26to display the fault data for the possible events. This allows you to check that the fault covers the area you are interested.
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