This page contains the latest processing info and links to the important files. Please look here for info
as we progress through the next few days.

The  field  data  and matlab scripts are available in this directory. Data can be accessed three ways:

(1) The text can be read through your web browser by clicking resistivity or gravity
on the appropriate file.  If you are looking for Wenner array data (e8 and e9), Derrick has provided some
extra code.  Images of the seismic sections are also online.

(2) The files can be copied from the directory /home/GPSUserWebPages/ge111/Gravsurvey  or  /home/GPSUserWebPages/ge111/Ressurvey  as appropriate.

(3) On the PC in SM366 (Kodiak) in the directories d:/GE 111/Gravsurvey and d:/GE 111/Ressurvey.

Gravpoly, the gravity simulation package,  runs only in Windows. There are two PCs available in South Mudd  and a few others in 215 NM. You can also install the software on your own computer using the website:
http://www.es.lancs.ac.uk/es/people/teach/br/progs/GravPoly/GravPoly.htm.

An introduction to matlab is available here.

There are now 4 versions of the gravity processing matlab script.  All four do drift, calibration, latitude and free air corrections and plot the results. They all also have the option of dumping a gravpoly file. They differ as follows:

processgravangle This reads in angle survey data (azimuth, horiz distance, elevation).
In the gravpoly file it calculates horizontal distances relative to the total base station.

processgrav This reads in x y coordinate data.
In the gravpoly file it calculates horizontal distances relative to the total base station.

pgatopo This reads in angle survey data (azimuth, horiz distance, elevation).
In the gravpoly file it calculates horizontal distances relative to the first point on the survey line.

pgtopo This reads in x y coordinate data.
In the gravpoly file it calculates horizontal distances relative to the first point on the survey line.

For most purpose pgatopo is the script of choice. Use pgtopo for combinined survey line, i.e.
Monday and Wednesday, and the older processgrav and processgravangle if you want
to measure distances in gravpoly relative to the total base station.

To create synthetics do the following:

1) run matlab on a Unix machine

2) type processgravangle, processgrav, pgatopo or pgtopo as appropriate
at the matlab prompt and answer the questions. When you are prompted, input
a filename for your gravpoly file.

3) Exit matlab and type "unix2dos [gravpolyfilename] [dosgravpolyfilename]"
This converts the text to something readable by the PC

4) Find a PC and use the WSFTP tool to FTP your file from your Unix account
to the PC

5) Run Gravpoly and open your file.

Each individual is responsible for processing the following areas. See the handout for definitions of the areas.

Matt                                                Central                                    Topography
Lori                                                  Fault                                        Topography
Aron                                                Fault                                         Topography
Wren                                                Edge                                         Topography
Collins                                              Central                                    Edge
Magali                                              Central                                    Edge
Antonin                                            Edge                                        Fault
John                                                   Edge                                       Topo
Mohi                                                 Central                                    Fault
Derrick                                             Central                                    Fault
Margaret                                          Edge                                        Fault
Jing                                                     Central                                   Topography

Resisitivity Survey Info
 

Line Name	Type	Group
E1	Schlumberger	Central
E2	Schlumberger	Central
E3	Schlumberger	Edge
E4	Schlumberger	Edge
E5	Schlumberger	Topography
E6	Schlumberger	Fault
E7	Schlumberger	Fault
E8	Wenner	Fault
E9	Wenner	Topography

Seismic Data Info

Seismic Line Name	Day	Group
BH1	Monday	Central
BH2	Tuesday & Wednesday	Edge
BH3	Thursday	Fault
BH4	Friday	Topography

To obtain access to seismic data:
(1) type "xhost +betsy"
(2)  rlogin to betsy
(3) setenv DISPLAY  [computer name]:0.0
(4) type "isis"
(5) On the first time you access a dataset, choose "new data."  Data path is /opt/isis/betsy/data.
       After the first time, just choose open.

NOTE: The plot module always must be the last one in the sequence.

Review Session and Meeting Schedule (all meetings in 215NM unless otherwise indicated)

Monday                                               1:00 PM                                Seismics
                                                               2:30 PM                                Resistivity
                                                               3:00 PM                                Gravity

Tuesday                                               3:00 PM                                Discuss processing results

Wednesday                                         5:00 PM                                REPORTS DUE

366 South Mudd: Unix machines & 1 PC w/ gravpoly
250 South Mudd: Unix machines
351 South Mudd:  Unix machines
316 North Mudd:  Unix machines
215 North Mudd: PCs w/gravpoly
Basement North Mudd: Unix machines
GIS Lab (305 NM): Unix machines

Please see Rob Clayton if you have trouble getting access to a computer.

Email Addresses

Margaret Belska      mb@gps.caltech.edu
Antonin Bouchez  antonin@gps.caltech.edu
John Clinton     jclinton@its.caltech.edu
Brian Collins  collins@gps.caltech.edu
Lori K. Fenton   lori@gps.caltech.edu
Mohana (Mohi) Kumar  mohi@cco.caltech.edu
Derrick Hasterok wolfram@cco.caltech.edu
Matt Pritchard    matt@gps.caltech.edu
Magali Billen    magali@gps.caltech.edu
Jing Liu   jing@gps.caltech.edu
Aron Meltzner   meltzner@gps.caltech.edu
Wren Montgomery    wren@ugcs.caltech.edu

TAs:
Emily Brodsky   brodsky@gps.caltech.edu
Julie Nazareth  julie@gps.caltech.edu

Instructors:
Rob Clayton      clay@gps.caltech.edu
Mark Simons     simons@gps.caltech.edu
Joann Stock      jstock@gps.caltech.edu