The Searchable Product Depository (SPUD) is the IRIS DMC's primary data
product management system. Complementing the DMC's SEED and assembled
data archives, which contain time series recordings, the SPUD system
primarily contains derivative data products of other types (images,
movies, etc.) created either at the DMC or by members of the community.
For users SPUD is the query and access point for these products. The
web interfaces allow users to search for products using customized queries
across product and event details. Users can search across all product
types at once or within specific product types. SPUD also has web service
interfaces for programmatic discovery and access to the data products.
If any products from SPUD are used in your research please be sure to cite
the identified author of the product and the IRIS DMS
[Citation Information].
About Film Chip Products
The USGS WWFC Pilot Scanning Project
The World Wide Standardized Seismograph Network (WWSSN) began operations in
1961. One hundred twenty stations were installed, covering every continent.
A station consisted of 3 short-period and 3 long-period seismometers, recording
apparatus, radio-synchronized crystal clock, and calibration controls.
Data were originally recorded on photographic paper, then later on heat
sensitive paper. The original records were photographed at the WWSSN Data
Center using 70 mm film and stored by station and year on a 70 x 120 mm film
chip. Lamont-Doherty Earth Observatory and the USGS Albuquerque Seismological
Laboratory (ASL) each hold near-complete film chip sets of the WWSSN data.
The slow degradation of these film chips has prompted this pilot project in
1999.
The film chips are black and white and have been digitally scanned with a
resolution of 3200 dpi. The image has been cropped to exclude areas on the
film chip which do not contain the image of the original record, however in
all cases, the final product contains all of the original photographed record.
The resulting grey-scale images have been saved at approximately 1/10th of
the original film chip size as TIF files and then compressed using gzip.
Enlarging the images by a factor of 10 results in images similar in size
to the original analog record.
Product Query Help
This page queries for Film Chip products.
Click on row in query results to view item detail.
Column headings control sort order of results.
Start and end dates are specified by clicking on date entry fields to enable date selector.
Or use popup calendar to select date by clicking on calendar icon next to date fields.
Clear button removes all selection criteria
Download button will return a zip file containing all items matching current
criteria or only selected items (if any are selected via leftmost column)
Download request too large
Requested download count exceeds maximum size (200) for this product.
