CMTSOLUTION_SOURCE

[jxhxb]

If i set the Switches in Par_file‘ source part as following: USE_SOURCES_RECEIVERS_Z = .false. USE_FORCE_POINT_SOURCE = .false. USE_RICKER_TIME_FUNCTION = .true. USE_EXTERNAL_SOURCE_FILE = .false. PRINT_SOURCE_TIME_FUNCTION = .false. USE_SOURCE_ENCODING = .false.

and i make the parameters in CMTSOLUTION as these: this is a module with strike 0,dip 90, and i want to set 4 CMT-sources in a plane(3m.5m).

My questions are: 1: USE_RICKER_TIME_FUNCTION = .true. This setting is working in CMTSOLUTION? If there is also the concept of 'dominate frequency' ,and where to change it ? 2：What is the unit of half_duration? 3：If i set the half_duration=80, the source function will be replaced by Guass_function? 4:Can i get the Green‘’ function through use CMTSOLUTION-source，and how to make it?

[jxhxb]

question : 1:What‘s the meaning of 'SXY_semd ’, is SXY_semd used for calculate Green's function?

[danielpeter]

regarding the USE_RICKER_TIME_FUNCTION option, it is considered for both cases, force and CMT sources. turning this option on, the source will always use a Ricker wavelet. in your case, you specify the dominant frequency in the half duration: ... in the example shown above, that's set to 80 Hz.

for the strain seismograms, that was implemented by @homnath - you might reach out to him to get more details about what you see.

if you want to simulate Green's functions for a CMT source, you would use a single component CMT and a half duration of zero to mimick a Heaviside source time function.

[homnath]

Hi Jing Luo:

To elaborate on Daniel's response, there are two ways of computing the Green's functions depending on what you want or how you want to use them.

1. Set the unit value for each moment tensor component at a time (CMTSOLUTION), as Daniel suggested, and record the three displacement components of (or velocity or acceleration). You need six simulations and store 6X3 =18 seismograms per station. 2. Set the unit value for each force component (FORCESOLUTION) and record the six strain components. You need three simulations and store 3X6 = 18 seismograms per station.

Best, Hom Nath

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Hom Nath Gharti, PhD Assistant Professor | Digital Earth Scientist https://www.digitalearthscience.com/ Department of Geological Sciences and Geological Engineering Miller Hall 314, 36 Union St Queen’s University Kingston, ON K7L 3N6, Canada

Queen’s University is situated on traditional Anishinaabe and Haudenosaunee Territory.https://www.queensu.ca/encyclopedia/t/traditional-territories

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From: daniel peter @.> Sent: Wednesday, September 18, 2024 3:42 AM To: SPECFEM/specfem3d @.> Cc: Hom Nath Gharti @.>; Mention @.> Subject: Re: [SPECFEM/specfem3d] CMTSOLUTION_SOURCE (Issue #1739)

regarding the USE_RICKER_TIME_FUNCTION option, it is considered for both cases, force and CMT sources. turning this option on, the source will always use a Ricker wavelet. in your case, you specify the dominant frequency in the half duration: ... in the example shown above, that's set to 80 Hz.

for the strain seismograms, that was implemented by @homnathhttps://github.com/homnath - you might reach out to him to get more details about what you see.

if you want to simulate Green's functions for a CMT source, you would use a single component CMT and a half duration of zero to mimick a Heaviside source time function.

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