Archives by Stations

Introduction
These archives contain seismograms and related materials of the "Reference Stations of the World". These Reference Stations are chosen for their strategic locations and long durations in operation.

Volunteers are welcome.  Please contact William H. K. Lee at: whklee@ix.netcom.com

1. San Juan, Puerto Rico    

A seismographic station in Puerto Rico has been in operation as Vieques (VQS) from 1903-1924, as San Juan (SJP) from 1926-1963, and San Juan (SJG) from 1963 to the present. For SJP, the station information is given in the file: SanJuan_Charlier1953.pdf  A history of seismic recording in Puerto Rico is given in the file seismic-recording_history_Puerto_Rico.pdf.

Each seismogram on microfilm was scanned at 8-bit gray scale and high resolution (2400 dpi or better, so that it is equivalent to 300 dpi or better for the original-size seismogram before microfilming) and image editing was performed for quality control. The filename include station code, year, month, date, and component of the seismogram.

Index of Scanned Seismogram Image Files by Month for the SJG Station of the World-Wide Standardized Seismograph Network (WWSSN) that are ready for download.

Please click the filename in the following table to access one month of available scanned seismograms by year and month.

[Bill McCann, March 31, 2009, wrote] In the end we hope to have several types of information added to the site. They include: bulletins of seismic stations, early 20^th century lists of seismic stations (1921, 1931, 1953, 1964, and 1979), inventories of data holdings of paper seismograms at the Denver Federal center in Lakewood, Colorado, the USGS microfilm holdings in Golden, Colorado, TIFF images of seismograms of Caribbean earthquakes and several years of the reference station SJP.  Finally, we have more than 4,000 images of Tide gauge records (marigrams) of tsunami copied from the DVD holdings of the NGDC in Boulder, Colorado.

Supported by volunteers.



(Last Updated: March 31, 2009 (mfd)