U S DEPARTMENT OF THE INTERIOR
U S GEOLOGICAL SURVEY
Digital Data Series DDS-29 [1995] Preview
WWW Page updated 10/95
Photo CD format digital images
of the
October 17, 1989,
Loma Prieta, California,
Earthquake
- J. K. Nakata [1], C.E. Meyer [1], H.G. Wilshire [1],
- J C. Tinsley [1], W.S. Updegrove [2], D.M. Peterson [1],
- S.D. Ellen [1], R.A. Haugerud [3], R.J. Mclaughlin [1]
- and G.R. Fisher [4]
INTRODUCTION
On October 17, 1989, at 5:04:15 p.m. (p.d.t.) a magnitude 7.1 earthquake
severely shook the greater San Francisco and Monterey Bay areas. The
epicenter was located approximately 14.5 km (9 mi) northeast of Santa Cruz
and 96.6 km (60 mi) south-southeast of San Francisco, near Loma Prieta Peak
in the Santa Cruz Mountains. The hypocenter was at a depth of 13.5 km (8.4
mi) along the boundary of the Pacific and the North American Plates. This
boundary is expressed at the surface as the San Andreas Fault Zone.
This World Wide Web page is a preview of a Photo CD format CD ROM
to be released early in 1996 as part of the U.S. Geological Survey's Digital Data Series. The original release date of summer 1995 has been moved back because of severe staff reductions.
The Preview: On-line Digital Images
Index map of photographic sites (48 KB)
About This Internet Preview
The preview thumbnail and screen resolution images on the individual pages
listed above are in GIF and JPEG formats respectively, but suffer resolution loss due to compression compared to the original PhotoCD images.
Each of these resolutions may be downloaded from the following addresses:
Feel free to use any of these images but please cite the photographer and the U.S. Geological Survey.
The complete pack of 5 resolutions per image will be available only on the CD ROM. For order information contact our Earth Science Information Center in Denver, Colorado in late fall of 1995.
About the Loma Prieta earthquake CD ROM
This CD-ROM contains 103 digitized color 35mm images from Open-File Report
90-547 (Nakata and others, 1990). Our photographic coverage reflects the
time and resources available immediately after the event and is not
intended to portray the full extent of earthquake damage.
The CD will have both Macintosh and Windows search engines but may be accessed from any platform with
software capable of reading Photo CD's.
As an experiment, we are also considering including HTML documents and
possibly one or more public-domain Web browsers for navigation.
Do you want a specific browser for your platform? World Wide Web Browsers
About Photo CD format
In the hierarchy of file formats, Photo CD (YCC) resides above BMP, EPS, GIF, JPEG, MOV, PCX, PICT, PSD, TIF, TIFF, etc., enabling end users to go from YCC to other formats, but not in the other direction without losing image quality. Each 24-bit color image is stored as 5 resolutions;
1. Thumbnail [192 x 128 pixels] Contact-sheet-size images for quick previewing of the entire collection.
2. FPO "For Placement Only" [384 x 256 pixels] A proxy for high-resolution images to determine placement in page-layout programs.
3. Screen Resolution [786 x 512 pixels] Ideal for computer viewing and multimedia projects.
4. HDTV High-Definition Television [1536 x 1024 pixels] Sufficient resolution for high definition TV, newspapers, and high-quality half-page layouts.
5. High Resolution [3072 x 2048 pixels] Provides the printing industry with resolution sufficient for high-quality full-page layouts at 300 dpi/150 lpi and 24-bit color.
Do you want to know more about Photo CD?
Where can I get my images transferred to a Photo CD's
Other sources of information about the Loma Prieta Earthquake
Other sources of information
Acknowledgments
We thank our colleagues: Richard Pike, for his thorough scrutiny of the entire manuscript; Robert Mark, for reviewing the computer section; Edward Helley, who originally reviewed Open-File Report 90-547; Evelyn Newman, David Traudt, Michael Diggles, Sue Mayfield, and George Havach for facilitating authoring of the CD ROM; Todd Fitzgibbon, for a short course in HTML; and Jack Hillhouse, for supporting the project. We especially thank Alpha CD Imaging of Menlo Park, California for their technical assistance.
Upcoming U.S. Geological Survey Photo CD Projects
List of future projects
- 1. U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025
- 2. U.S. Geological Survey, University of Arizona, Tucson, AZ Čt>
- 3. U.S. Geological Survey, University of Washington, Seattle, WA 98195
- 4. Harlan Tait Associates, 1 Kearny Street, San Francisco, CA 94108
Disclaimer: This report is preliminary and has not been reviewed for
conformity with U.S. Geological Survey editorial standards. Any use of
trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Index map of photographic sites (48 KB)