cfm 2 virtual workshop

Some evaluators reported problems with the display of a few t-surfs in the la3d viewer. We now modified the t-surfs to become importable into la3d, keeping an unchanged geometry. Please download the new compressed package cfm2b.tar.gz and follow the instructions at "Get new faults" below.
Additionally we produced a map which shows all cfm2 evaluation faults with labels and a grid of 7.5' quadrangles for orientation. Please use the map in addition to la3d or as a fall back for your evaluation. There is a color label version cfm2_color_map.jpg and a white label version cfm2_white_map.jpg, for better contrast and printing. Here are the two corresponding pdfs for easier printing: cfm2_color_map.pdf and cfm2_white_map.pdf

CFM 2 will be released at the upcoming SCEC Annual Meeting. Before this release we would like to incorporate your feedback and input on the faults included in CFM 2. On this web page and in the email you should have received there are instructions on how to download and install the CFM 2 fault data, a 3d fault viewer for MS Windows, Mac OS X, and linux, and a spreadsheet for evaluating the model. After evaluating the model, please complete the spreadsheet and return it as an email attachment to: andreas_plesch@harvard.edu and/or shaw@eps.harvard.edu .

Please note that the fault representations currently provided on http://structure.harvard.edu/cfm are CFM 1 and were not updated for this evaluation. While some did not change for the release of CFM 2, a large number were modified or added. Please use the provided packages from this page for evaluation of CFM 2.

First, please download the compressed package cfm2.tar.gz and extract its contents into a working directory of your choice using winzip or similar. This package contains representations for all CFM 2. There is another compressed package, cfm2_alternatives.tar.gz, which contains alternative representations of faults which were characterized in more than one way. Please review all of the representations for a given fault, and assign a quality ranking to each. These ratings will serve as the basis for defining preferred fault representations.

Next, download the la3d viewer from http://epicenter.usc.edu/la3d and install it following the instructions provided at this page. The la3d developers welcome any feedback on the use of their software at http://epicenter.usc.edu/la3d/bT/input.html. Please submit bug reports to this page. We urge you to return other comments or support questions to contacts provided on the la3d download page or to Sue Perry (perry@gps.caltech.edu). The viewer comes with the current CFM version. In order to view the new model, it is necessary to import the new directory on your computer into la3d as outlined below. A latitude-longitude grid, the coast line, the location of major cities and highways should help in navigating. Additional data sets include a DEM and the Dinger-Shearer relocated earthquake catalog.
Update 08/30/04: mac/linux users should use the new la3d 1.0.1 version now available
Update 08/30/04: windows and mac users need to install la3d a second time to a different installation folder to be able to open a second la3d window

We suggest to follow these step by step instructions to become familiar with the browser and viewing of the faults:
1) start LA3D
2) toggle on the check box "CFM"
3) a new window appears with a list of CFM version 1 faults
4) toggle on the check box next to "CFMA Faults"
5) all faults in the list are toggled on and are displayed
6) try to navigate carefully with the mouse, see LA3D instructions
7) click "Reset View"
8) toggle off the check box "CFM"
9) click "Import CFM Data"
10) a file selection dialog appears
11) use it to select the directory to which you had extraced the new CFM2 fault archive and click "open"
12) toggle on the check box "CFM"
13) a new window appears with the imported faults
14) toggle on all faults
15) toggle the display of single faults in the list and identify them in the viewer window
16) start up a second instance of LA3D using the second installation
17) arrange the viewer windows to facilitate comparisons
18) import the directory to which the CFM 2 alternative fault package was extracted
19) compare alternative representations of faults in the viewer windows
20) open the provided spreadsheet using Excel or similar, and proceed with your evaluation

Please review the faults with the viewer, and evaluate the representations by filling in the spreadsheet. We specifically request 3 types of input:
1) assess the quality of the fault representations (1-5), in part to help distinguish alternative fault representations.
2) assign a measure of spatial uncertainty, to the fault representation at depth (high, moderate low); and
3) provide general comments on the way fault representations can be improved.

Here are the guidelines by which the quality rankings are defined:
- quality 1: A fault representation that, within the specified limits of uncertainty, accurately describes the geometry of a fault based on direct surface and/or subsurface observations of the fault plane, including surface traces, borehole penetrations, precisely located seismicity, and/or direct fault-plane reflections. In summary: detailed trace, mapable on reflection seismic, related seismicity
- quality 3: A fault representation that, within the specified limits of uncertainty, describes a viable geometry of a fault based on limited direct observations of the fault plane and/or interpretations that are based on reliable geological and geophysical information. (This rating can describe a fault with a known surface trace, but with limited subsurface constraints, as well as a fault surface interpreted based on cut-offs, folds, and/or micro-seismicity.). In summary: trace and dip from a number of exposures
- quality 5: A fault representation that describes a fault geometry based solely on inference, without direct constraints on subsurface geometry or position. In summary: wholly model based, inferred

The spatial uncertainty of faults at depth should be assigned as follows:
- high: > 5km uncertainty
- moderate: 2 - 5km uncertainty
- low: 0 - 2km uncertainty

Comments could include suggestion for new faults which should be added to CFM, or for modifications (dip direction, dip magnitude, important branches ...) of existing ones. You are invited to leave public comments on the testcfm blog at http://testcfm.blogspot.com which could be used for some public discussion.

Please contact us if we can assist with your CFM evaluation. Many thanks for your valuable participation.

cfm2_color_map.jpg
cfm2_color_map.pdf
cfm2_white_map.jpg
cfm2_white_map.pdf
cfm2b.tar.gz
cfm2.tar.gz
cfm2_alternatives.tar.gz
la3d viewer
evaluation spreadsheet

CFM homepage
www.scec.org
Contact information:
Andreas Plesch andreas_plesch@harvard.edu
John Shaw shaw@eps.harvard.edu
Dep. of Earth and Planetary Sciences
20 Oxford St. Cambridge, MA, 02138
Tel. 1-617-495-2356 Fax.: -7660
http://structure.harvard.edu/~plesch