The University of the West Indies, at Mona, Jamaica Homepage

The University of the West Indies

at Mona, Jamaica

Earthquake Unit

 
 leaf as bullet  Home
 leaf as bullet  Our Mission Statement
 leaf as bullet  History
 leaf as bullet  Earthquakes in Jamaica
 leaf as bullet  Staff
 leaf as bullet  Earthquake Report Form
Last Felt Earthquake: Saturday, April 28, 2007 at 2:17pm. Magnitude - 3.6 Epicentre - Near Silver Hill Peak, Portland (Blue Mountain Block Sub-area) Focal Depth - 5 km
Did you feel it? Please click here to download and print our Earthquake Report Form*. *Requires Adobe Reader
 
Antenna used for transmitting data 
Visiting school students at Earthquake Unit booth during exhibition
 
     
The Jamaica Seismograph Network

Map of Jamaica Seismograph Stations
An overview map of the stations in the Jamaica Seismograph Network
Faults shown as black lines and red dots for some past epicentres

For list of Jamaica Seismograph Network Stations, click here

General Information
Three sensors measuring vertical and horizontal ground movement
Three seismometers (sensors) attached to accelerometer
(Click to enlarge)

Presently the Jamaica Seismograph Network (JSN) consists of twelve(12) permanent short-period seismograph stations, one broad-band instrument and eight digital accelerographs. Four of the stations have three sensors that measure ground movement vertically and in two horizontal directions (pictured right).

The stations are equipped with Mark L-4, 1-second seismometers and Geotech field electronics. Signals from the stations are transmitted by frequency modulation continuously using UHF analogue telemetry to a Central Recording Station (pictured below-left) at the Mona Campus of University of the West Indies in Kingston. There the signals are digitized at 50 and 100 hertz (Hz). An earthquake is declared and recorded when three signals go high and stay high simultaneously. Then all stations write the event enabling real-time detection and recording of global seismic activity and more importantly, the location and magnitude determination of earthquakes on and near to Jamaica.

Outdoor antenna used for transmitting seismograph station data
Antenna at Central Recording Station used for receiving seismograph station data

The digital accelerographs record only significant ground motion in the immediate vicinity of the instrument, typically from local earthquakes with magnitude 4 and higher. These records are used for delimiting strong ground shaking thereby determining the potential for damage in affected areas.

 

List of JSN Stations
BBJ
Bamboo, St. Ann 18.39N 77.26W 760
BNJ
Bonnygate, St. Mary 18.32N 76.95W 490
CMJ
Castle Mountain, Portland 18.14N 76.36W 390
CVJ
Pike/Coleyville, Manchester 18.23N 77.53W 990
GWJ
Greenwich, St.Andrew 18.07N 76.73W 1170
HOJ
STH*
Stony Hill, St. Andrew 18.08N 76.81W 500
YHJ
Yallahs, St. Thomas 17.89N 76.49W 600

* = 3-component stations

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