9 Apr
2020
9 Apr
'20
2:26 p.m.
Thank you Dominique.I will try rayt2d. By self doc ı assume you mean the info one sees
after typing the module name. Do you? I wonder why isn't there a pdf file for each
module in su. It seems typing module name to get the parameters of a module is not
sufficient.NecatiSent via the Samsung GALAXY S® 5, an AT&T 4G LTE smartphone
-------- Original message --------
From: Dominique ROUSSET <dominique.rousset(a)univ-pau.fr>
Date: 4/9/20 15:30 (GMT+03:00)
To: seisunix(a)mailman.seismic-unix.org
Subject: Re: [Seisunix] Color palette for seisview
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(a)gmail.com>
Date: 4/5/20 21:38 (GMT+03:00)
To: seismic unix <seisunix(a)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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|Dominique Rousset LFCR UMR5150 / E2S UPPA / Dpt des géosciences|
|Univ. Pau et des Pays de l'Adour BP 1155 F-64013 Pau Cedex - France|
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