# Puerto Rico VQS, SJG, SJP The US Coast and Geodetic Survey maintained the earliest magnetic and seismic observatories in the Caribbean. The first seismographs in the region were installed in September 1903 at Fort Isabel Segunda on Vieques. The observatory moved to the island of Puerto Rico at the end of 1924. ## Stations **Location** | **Code** | **Latitude** | **Longitude** | **Timespan** | **Components** :--- | :---: | :---: | :---: | :---: | :---: Cayey, Puerto Rico| SJG | 18.116 | -65.15 | 1963 | 6 San Juan, Puerto Rico | SJP | 18.3815 | -66.1179 | 1926-1963 | 3 Vieques, Puerto Rico | VQS | 18.147 | -65.447 | 1903-1924 | 2 See the Seismo Archive [website](https://ds.iris.edu/seismo-archives/stations/puerto_rico/) for additional station information. ## Instrumentation Bosch-Omori (NS, EW) Wenner (NS, EW) Benioff (Z) WWSSN SP & LP ## Recording Medium smoked paper photographic paper microfilm ## Data Availability **SJP:** Selected local events from 1930-1932 and 1943-46 are available through IRIS [Seismoarchives](http://ds.iris.edu/seismo-archives/stations/puerto_rico/). **SJG:** 1968-1976 **no. available** | **format** | **dpi** | **color** | :---: | :---: | :---: | :---: | tiff | 500 ppi | grayscale See also WWSSN. As part of an IASPEI sponsored program, all magnetic observatory reports with seismic data for VQS have been scanned for the period 1903‐1924 and available through Seismo Archives. ## Contact For more information about this collection, please contact: \< *blank* \> ## References McCann, William R. Brief History of Seismic Recording in Puerto Rico. http://ds.iris.edu/seismo-archives/stations/puerto_rico/references/seismic-recording_history_Puerto_Rico/seismic-recording_history_Puerto_Rico.pdf *Last accessed 14 January 2022* Seismo Archives. https://ds.iris.edu/seismo-archives/stations/puerto_rico/ *Last accessed 14 January 2022*