Hi,

As far as I know, seisview is not used a lot and not really maintained.  I hope someone else can answer you question.

regarding sukdmig2d in SU, you can generate the travel time table using rayt2d.

From sukdmig2d selfdoc : "1. Traveltime tables were generated by program rayt2d (or other ones)      on relatively coarse grids, with dimension ns*nxt*nzt. In the           migration process, traveltimes are interpolated into shot/gephone       positions and output grids. "

I use it for teaching and it works.

regarding 3D, (and associated sutetraray travel time table calculator) I have no experience with it. I am a not sure that 3D PSDM can really run in scalar mode.  I did not try, but I am curious.

From sukdmig3d selfdoc : "Disclaimer:                                                             This is a research code that will take considerable work to get into    the form of a a production level 3D migration code. The code is         offered as is, along with tetramod and sutetraray, to provide a starting  point for researchers who wish to write their own 3D migration codes."

Le 09/04/2020 à 07:34, n.gulunay a écrit :

Hello every one, I hope you are all safe and doing well. I have two questions,

1. Is there a good color palette for color plotting velocity-time or

velocity-depth sections in seisview? Also Is there any instructions on how to bring newly created palettes to seisview display settings menu?

2. Are there any detailed instructions in su on how to build needed

tables and run kdmig2d and kdmig3d? İf yes, where?

Stay safe.

Sent via the Samsung GALAXY S® 5, an AT&T 4G LTE smartphone <

-------- Original message -------- From: John Stockwell john.19071969@gmail.com Date: 4/5/20 21:38 (GMT+03:00) To: seismic unix seisunix@mailman.seismic-unix.org Subject: [Seisunix] Modeling Covid-19 with Seismic Unix

I send my good wishes to all of you and I hope that you, your families, and your friends are faring well in this difficult time.

For those who are interested in modeling populations, such as the current epidemic, there is a logistic equation solver called “verhulst” in the SU package which you may find of interest.

For example for Covid-19 cases in the US, taking 22 January as day 0 of cases in the US and 29 February as day 0 for deaths. Respective stepmax= values of 72 for cases and 34 for deaths are both 3 April

verhulst stepmax=72 h=1 a1=.176 y0=1 a2=1e7 mode=x > calculated_cases.bin

verhulst stepmax=35 h=1 a1=.268 y0=1 a2=1e6 mode=x > calculated_deaths.bin

xgraph < calculated_cases.bin n=72 nplot=1 d1=1 &

xgraph < calculated_deaths.bin n=34 nplot=1 d1=1 &

The growth rate a1 values are determined empirically from publicly available data, in this case from the CDC and from the Worldometer site. You will have to make your own estimate of a1 for the data that you are modeling.

Another parameter that is harder to get is an estimate of the carrying capacity of the system a2. Here I am assuming a maximum of 1 million cases in the US and 100 thousand deaths.

The number of new cases or deaths per day is measured by the derivative of the solutions to the verhulst equation

verhulst stepmax=72 h=1 a1=.176 y0=1 a2=1e7 mode=y > delta_cases.bin

verhulst stepmax=35 h=1 a1=.268 y0=1 a2=1e6 mode=y > delta_deaths.bin

xgraph < delta_cases.bin n=72 nplot=1 d1=1 &

xgraph < delta_deaths.bin n=34 nplot=1 d1=1 &

The peak in the change of the population per day occurs when the population reaches the exactly half of the carrying capacity of the system. Thus, raising the carrying capacity will increase the height of the peak and move it out later in time.

Take care, everyone and stay safe.

-John

John Stockwell Visit: https://wiki.Seismic-Unix.org The new home of Seismic Un*x

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